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Are there any nicely structured preference profiles nearby? [article]

Robert Bredereck, Jiehua Chen, Gerhard J. Woeginger
2015 arXiv   pre-print
We investigate the problem of deciding whether a given preference profile is close to having a certain nice structure, as for instance single-peaked, single-caved, single-crossing, value-restricted, best-restricted  ...  We measure this distance by the number of voters or alternatives that have to be deleted to make the profile a nicely structured one.  ...  There are cases where the computational tractability of voting problems on nicely structured profiles transfers to nearly nicely structured profiles and cases where the vulnerability disappears even if  ... 
arXiv:1509.04595v1 fatcat:ymo6urswhrgexfpgkb4g45mpsa

Are there any nicely structured preference profiles nearby?

Robert Bredereck, Jiehua Chen, Gerhard J. Woeginger
2016 Mathematical Social Sciences  
We investigate the problem of deciding whether a given preference profile is close to a nicely structured preference profile of a certain type, as for instance single-peaked, single-caved, singlecrossing  ...  We measure this distance by the number of voters or alternatives that have to be deleted so as to reach a nicely structured profile.  ...  A third line of research is to investigate whether and in which way properties of nicely structured preference profiles transfer to profiles that are only close to being nicely structured.  ... 
doi:10.1016/j.mathsocsci.2015.11.002 fatcat:r6g2rro36bc4nbebwsor5m6uxi

Exploring Everyday Self-Regulation in Nearby Nature: Determinants, Patterns, and a Framework of Nearby Outdoor Recreation Behavior

Barbara Degenhardt, Matthias Buchecker
2012 Leisure Sciences  
I would personally have preferred to ride up to Zueriberg [mountain] because to go there, I wouldn't have to ride across and through the city, the many cars, the bad cycle paths that there are here.  ...  RW noted, "I prefer to go to the lake and sit there and watch the lake. That gives me a bit of peace. And the hecticness goes away a bit."  ... 
doi:10.1080/01490400.2012.714706 fatcat:tlu2cftqrbc7ffajkx5dtvacaq

The host galaxy/AGN connection in nearby early-type galaxies

A. Capetti, B. Balmaverde
2005 Astronomy and Astrophysics  
Our sample of AGN candidates is indistinguishable, when their brightness profiles are concerned, from galaxies of similar optical luminosity but hosting weaker (or no) radio-sources.  ...  However, below this threshold in radio-luminosity core and power-law galaxies coexist and they do not show any apparent difference in their radio-properties.  ...  Prominent dust features are often present and they are masked before fitting; in the radial range corresponding to dust structures, we usually preferred to fix the isophotes center, position angle and  ... 
doi:10.1051/0004-6361:20053113 fatcat:u7wuzw73kzavxcin6upqgq6neq

Locality and privacy in people-nearby applications

Eran Toch, Inbal Levi
2013 Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing - UbiComp '13  
People-Nearby applications are becoming a popular way for individuals to search for new social relations in their physical vicinity.  ...  This paper presents the results of a qualitative study, based on 25 interviews, examining how privacy and locality are managed in these applications.  ...  Features of People-Nearby Applications User Profiles and Identities The way users construct their online profile, the information it contains and the way it is presented, structure the boundaries of  ... 
doi:10.1145/2493432.2493485 dblp:conf/huc/TochL13 fatcat:6g75zr3lhzdaxlg3us5zamp44q

Radii of Young Star Clusters in Nearby Galaxies [article]

Gillen Brown, Oleg Y. Gnedin
2021 arXiv   pre-print
We also find that most clusters in LEGUS are gravitationally bound, especially at older ages or higher masses.  ...  We present simple toy models to interpret these age trends, finding that high-mass clusters are more likely to be not tidally limited and expand.  ...  The catalogs include properties such as mass and age that are originally from the LEGUS catalogs, which are found at https://archive.stsci. edu/prepds/legus/dataproducts-public.html.  ... 
arXiv:2106.12420v2 fatcat:kbako4r65za3xlouvmzgviuysq

Surface Photometry of Nearby Field Galaxies: The Data

Rolf A. Jansen, Marijn Franx, Daniel Fabricant, Nelson Caldwell
2000 Astrophysical Journal Supplement Series  
We present an atlas of images, radial surface brightness profiles and color profiles, as well as tables of derived parameters.  ...  We have obtained integrated spectra and multi-filter photometry for a repre- sentative sample of ~200 nearby galaxies.  ...  Panel d identifies these systems as being physically smaller than average, while panel a shows that there is no preference towards morphological type.  ... 
doi:10.1086/313303 fatcat:scvlk4wyv5dslaz6oksqtcgm6e

Implications of Halo Inside‐Out Growth for the X‐Ray Properties of Nearby Galaxy Systems within the Preheating Scenario

J. M. Solanes, A. Manrique, G. Gonzalez‐Casado, E. Salvador‐Sole
2005 Astrophysical Journal  
We find that our preferred solution to the equilibrium equations produces scaling relations in excellent agreement with observations, while simultaneously accounting for the typical structural characteristics  ...  This model is used to explain, within a standard ΛCDM cosmogony, the observed X-ray properties of nearby relaxed, non-cooling flow groups and clusters of galaxies.  ...  We are interested in confronting the predictions of this halo growth process with both the observed global and structural X-ray properties of nearby groups and clusters of galaxies and, in particular,  ... 
doi:10.1086/430820 fatcat:2d56dqu5xraarpwuq2iab6iezi

The host galaxy/AGN connection in nearby early-type galaxies

A. Capetti, B. Balmaverde
2006 Astronomy and Astrophysics  
Thus the radio-loudness of AGN hosted by early-type galaxies appears to be univocally related to the host's brightness profile: radio-loud AGN are only hosted by core galaxies, while radio-quiet AGN are  ...  [ABRIDGED] This is the third in a series of three papers exploring the connection between the multiwavelength properties of AGN in nearby early-type galaxies and the characteristics of their hosts.  ...  This fits nicely with our finding that radio-quiet nuclei are associated with galaxies with a power-law brightness profile and suggests an extension of this link also to spiral hosts.  ... 
doi:10.1051/0004-6361:20054490 fatcat:6kp2fmxkqjaijl47frgext7y3i

Studying the dwarf galaxies in nearby groups of galaxies: Spectroscopic and photometric data

U. Hopp, J. Vennik
2014 Astronomical Notes - Astronomische Nachrichten  
Dwarf galaxies with their shallow potential are expected to reflect the interaction most prominently in their observable structure.  ...  For all candidates, total magnitudes, colours, and light distribution parameters are derived and discussed in the context of scaling relations.  ...  Acknowledgements We are grateful to the anonymous referee whose comments and suggestions were most helpful in improving the paper.  ... 
doi:10.1002/asna.201312115 fatcat:m4xmh7yvtjfpfn4mm45gahmip4

Kinematic segregation of nearby disk stars from the Hipparcos database

R. E. de Souza, R. Teixeira
2007 Astronomy and Astrophysics  
The sample we use is essentially the same as the one described by the criteria ad opted to study the LSR and the stream motion of the nearby stellar population  ...  To better understand our Galaxy, we investigate the pertinency of describing the sys tem of nearby disk stars in terms of a two-components Schwarzschild velocity distributio n.Using the proper motion and  ...  Since we are dealing with nearby objects, there is no loss of information, and the conversion between these two right-hand coordinate systems is easily made by adopting the transformations u = v r cos  ... 
doi:10.1051/0004-6361:20066257 fatcat:wypwrnvbl5b6dai5zaxcpycniy

Physical Bayesian modelling of the non-linear matter distribution: New insights into the nearby universe

J. Jasche, G. Lavaux
2019 Astronomy and Astrophysics  
We show accurate and detailed inferences of the 3D non-linear dark matter distribution of the Nearby Universe.  ...  We demonstrate the performance of the method by applying it to the 2M++ galaxy compilation, tracing the matter distribution of the Nearby Universe.  ...  This research was supported by the DFG cluster of excellence "Origin and Structure of the Universe" (www.universe-cluster.de).  ... 
doi:10.1051/0004-6361/201833710 fatcat:dlqp36dd4jaa7glrcp7fvrkek4

Deprojection of light distributions of nearby systems: perspective effect and non-uniqueness

HongSheng Zhao
2000 Monthly notices of the Royal Astronomical Society  
The physical ranges for γ and the major axis angles are constrained analytically by requiring a positive volume density everywhere.  ...  The case for nearby dust-free systems is studied, taking into account the extra constraints from the perspective effect. It is shown analytically that a new form of non-uniqueness exists.  ...  These models have also the nice property that the PS density falls off steeper than the spherical term G(r), meaning that the models are always nearly spherical with a positive, Gaussian profile at large  ... 
doi:10.1046/j.1365-8711.2000.03500.x fatcat:jllmume6svfmdidf7gsrwyht5a

Places nearby: Facebook as a location-based social media platform

Rowan Wilken
2014 New Media & Society  
However, following the strategic acquisitions of location-sharing start-ups Gowalla and Glancee, Facebook has ramped up its location-based services: they launched their Nearby feature in December 2012,  ...  These, and more recent acquisitions, are part of ambitious, longer-term moves that reposition Facebook as a local recommendation service (taking on Foursquare and Yelp), and, significantly, establish Facebook  ...  There are also obvious benefits of single sign-on for Facebook.  ... 
doi:10.1177/1461444814543997 fatcat:kci6lelf3vaidf5aiu3d4nba4i

Modelling of Wind Turbine Loads nearby a Wind Farm

B Roscher, A Werkmeister, G Jacobs, R Schelenz
2017 Journal of Physics, Conference Series  
These loads are analyzed and summed up. As expected, the change of the turbulence intensity due to the wake effect has an impact on the internal loading of a wind turbine inside a wind farm.  ...  The resulting wind fields are used to determine the loads through a multibody simulation of an imaginary wind turbine located at FINO-1, representing a closely placed wind turbine at the outer edge of  ...  Firstly, WT 4 is spaced closer than any other turbine. Secondly, the wake effects of WT 4, 5, and 6 are summing up at this inflow angle.  ... 
doi:10.1088/1742-6596/854/1/012038 fatcat:evre365ttncsxf6uzcyp2j2u64
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