Filters








53,753 Hits in 4.5 sec

How do spiral arm contrasts relate to bars, disc breaks and other fundamental galaxy properties?

Adrian Bittner, Dimitri A. Gadotti, Bruce G. Elmegreen, Evangelie Athanassoula, Debra M. Elmegreen, Albert Bosma, Juan-Carlos Muñoz-Mateos
2017 Monthly notices of the Royal Astronomical Society  
This does not hold for other spiral arm classes or the arm contrast. Our measurements of arm and bar contrast and radial contrast profiles are publicly available.  ...  Barred and unbarred galaxies exhibit similar arm contrasts, but the highest arm contrasts are found exclusively in barred galaxies.  ...  To do so, we use two different methods.  ... 
doi:10.1093/mnras/stx1646 fatcat:bxqdwyv7bfd5zgfsbhomonxggq

Moving photographic figures

A. Claudet
1865 Journal of the Franklin Institute  
In the revolving disk the two series of pictures do not move with the same velocity, on account ~f their being placed on two zones of different peripheries~ and this produces a sort of confusion and distortion  ...  In one picture the arms and fists of one of the pugilists are near his body, as if he were preparing to hit his opponent ; and in the other picture they are extended in the act of striking the blow.  ... 
doi:10.1016/0016-0032(65)90304-2 fatcat:qxzdco7ilvdtha7zml4xxukcpa

Move to design/design to move

Danielle Wilde, Thecla Schiphorst, Sietske Klooster
2011 Interactions  
In doing so we hope to provide material for reflection. For Movement The body is constantly in motion.  ...  In our technologycentered world, moving to design and designing to move restore the concept of design as bodily activity.  ...  We commonly assume that plea-Wilde's hipDisk, for example, requires the wearer to move in exaggerated ways to force two body-worn disks to touch, and thereby generate simple tones.  ... 
doi:10.1145/1978822.1978828 fatcat:fq24focqojcftjny7f3yqz3aju

A Self-Moving Ship

1871 Scientific American  
The turntables, D, are vibrating tables placed under the rails of the switching track, so as to move them either way as far as required,. and limit their motion.  ...  The disks.  ...  An arm from each turn· STRAIT'S TURN·TABLE AND HAND AND STEAM SWITCH FOR RAILROADS.  ... 
doi:10.1038/scientificamerican07011871-3 fatcat:53mnjdedvfadtept47ht26jfp4

Tracing the Origin of Moving Groups. III. Detecting Moving Groups in The LAMOST DR7 [article]

Yong Yang, Jingkun Zhao, Jiajun Zhang, Xianhao Ye, Gang Zhao
2021 arXiv   pre-print
We revisit the moving groups (MGs) in the solar neighborhood with a sample of 91969 nearby stars constructed from LAMOST DR7.  ...  Our results support attributing the origin to the continuous resonant mechanisms probably induced by the bar or spiral arms of the Milky Way.  ...  Some structures with low angular momenta below Hercules were reproduced, considering spiral arms plus a bar with a pattern speed of Ω b = 45 km s −1 kpc −1 and a hot disk with a velocity dispersion of  ... 
arXiv:2110.08061v1 fatcat:ysaim7pijvcu7h3neri3kue6ly

On multiple moving objects

Michael Erdmann, Tomás Lozano-Pérez
1987 Algorithmica  
One domain consists of translating planar objects; the other domain consists of two-link planar articulated arms.  ...  For each moving object, the planner constructs a configuration space-time that represents the time-varying constraints imposed on the moving object by the other moving and stationary objects.  ...  Each arm consists of two links and two joints, about which the links may rotate. The base of each arm is fixed in the plane, so the arms do not translate. The links are modeled as convex polygons.  ... 
doi:10.1007/bf01840371 fatcat:7uplyfewvrfjzkc76hfvwtebwa

How Moving Backgrounds Influence Interception

Eli Brenner, Jeroen B. J. Smeets, Nicholas P Holmes
2015 PLoS ONE  
Such guidance increases precision and allows one to adjust the movement if the target unexpectedly moves. On-going arm movements are also influenced by motion in the surrounding.  ...  Reaching movements towards an object are continuously guided by visual information about the target and the arm.  ...  During half of each session the moving target was small (1.4 cm diameter disk) and the static target was large (4.2 cm diameter disk).  ... 
doi:10.1371/journal.pone.0119903 pmid:25767873 pmcid:PMC4358934 fatcat:k5dkzr23ozbr5he42kc2nwk4qq

Quickly 'learning' to move optimally

Eli Brenner, Jeroen B. J. Smeets
2011 Experimental Brain Research  
In all cases, subjects sped up after stopping within a target and slowed down after failing to do so.  ...  We asked subjects to move a pen back and forth across a tablet to make a cursor move as quickly as possible between two targets. The cursor had to stop within the targets.  ...  Introduction There is variability in even the simplest of human arm movements.  ... 
doi:10.1007/s00221-011-2786-9 pmid:21748334 pmcid:PMC3140948 fatcat:p3kqmrri3fdqhpbfwuc3x57v54

Moving Groups Across Galactocentric Radius with Gaia DR3 [article]

Scott Lucchini, Emil Pellett, Elena D'Onghia, J. Alfonso L. Aguerri
2022 arXiv   pre-print
With ever improving data, numerous kinematic "moving groups" of stars have been better characterized and new ones continue to be discovered.  ...  We reproduce the majority of the previously detected moving groups in addition to identifying four additional significant candidates: one near Antoja12-GCSIII-13, one near GMG 5, and two with very low  ...  The MW's bar and spiral arms and their associated resonances have long been used to explain the origin of moving groups.  ... 
arXiv:2206.10633v2 fatcat:ywasvynkd5ec5fw6lngs4lmrki

Stars that Move Together Were Born Together [article]

Harshil Kamdar, Charlie Conroy, Yuan-Sen Ting, Ana Bonaca, Martin Smith, Anthony G.A. Brown
2019 arXiv   pre-print
In this Letter, we use Gaia DR2 and LAMOST DR4 data to identify and study co-moving pairs.  ...  We identify 111 co-moving pairs in the Solar neighborhood with reliable astrometric and spectroscopic measurements.  ...  arms, and GMCs (as perturbers).  ... 
arXiv:1904.02159v1 fatcat:s2abbxxl5renjahysoqersu2du

Prediction of a moving target's position in fast goal-directed action

Jeroen B. J. Smeets, Eli Brenner
1995 Biological cybernetics  
Subjects made fast goal-directed arm movements towards moving targets. In some cases, the perceived direction of target motion was manipulated by moving the background.  ...  By analysing the differences between subjects' arm movements towards targets moving in different (apparent) directions with a linear second-order model, we show that the reduction in the error that this  ...  To do this, we need a model of the arm movement. 7 Modelling approach The aim of our model is very modest: it is to describe differences between hand movements towards different (moving) targets in relation  ... 
doi:10.1007/bf00199544 pmid:8527498 fatcat:tidfks74ljethcbggywi7hvfqm

Stereoscopic Moving Pictures in Natural Colors

1909 Scientific American  
STEREOSCOPIC MOVING PICTURES IN ! the first lens. The effect is that in the NATURAL COLORS.  ...  STEREOSCOPIC MOVING PICTURES IN NATUBAL COLOB8.sensitized films, promises to improve chromo-photog· raphy.  ... 
doi:10.1038/scientificamerican10091909-256 fatcat:6x7kowndojgzxc6eo5urfct4ry

Flexibility in intercepting moving objects

Eli Brenner, Jeroen B. J. Smeets
2007 Journal of Vision  
When hitting moving targets, the hand does not always move to the point of interception in the same manner as it would if the target were not moving.  ...  An asymmetry in performance between hitting moving targets further in the direction in which they were moving and hitting them back from where they came is consistent with the different consequences of  ...  To do so, we determined the average velocity of the eyes during a moving window of 20 ms.  ... 
doi:10.1167/7.5.14 pmid:18217854 fatcat:y64llm4svneo5fj5njd2k4mdy4

Novel House-Moving Operations

Edward H. Crussell
1907 Scientific American  
These disks are pressed against the plate and moved to and fro, working into the lead further and further and spinning the metal between the knives up into thin ,.arallel ribs.  ...  SClllt>, % In. to the Foot. of rapidly revolving steel disks with spacing washers.  ... 
doi:10.1038/scientificamerican06221907-26305supp fatcat:cppvfyj5fnf7fknzzvw67pqkni

On the Evolution of Moving Groups: An Application to the Pleiades Moving Group [article]

R. Asiain, F. Figueras, J. Torra
1999 arXiv   pre-print
The disruption of stellar systems, such as open clusters or stellar complexes, stands out as one of the most reasonable physical processes accounting for the young moving groups observed in the solar neighbourhood  ...  the present study we analyse some of the mechanisms that are important in the kinematic evolution of a group of unbound stars, such as the focusing phenomenon and its ability to recover the observed moving  ...  We do not find any maximum in spatial concentration during the last 10 8 yr.  ... 
arXiv:astro-ph/9909050v1 fatcat:edpsczfvsjdnlnn6e27w7famvy
« Previous Showing results 1 — 15 out of 53,753 results