The Experts below are selected from a list of 301668 Experts worldwide ranked by ideXlab platform

Peter Erwin - One of the best experts on this subject based on the ideXlab platform.

  • the Relation between galaxy morphology and Environment in the local universe an rc3 sdss picture
    The Astrophysical Journal, 2012
    Co-Authors: David J. Wilman, Peter Erwin
    Abstract:

    We present results of an analysis of the local (z ~ 0) morphology-Environment Relation for 911 bright (MB 1010.5 M ☉ are S0 regardless of halo mass, but satellite S0 galaxies are only found in massive (>1013 h –1 M ☉) halos, where they are 69% ± 4% of the M * > 1010.5 M ☉ satellite population. This suggests two channels for forming S0 galaxies: one which operates for central galaxies and another which transforms lower-mass ( M * 1011 M ☉) accreted spirals into satellite S0 galaxies in massive halos. Analysis of finer morphological structure (bars and rings in disk galaxies) shows some trends with stellar mass, but none with halo mass; this is consistent with other recent studies which indicate that bars are not strongly influenced by galaxy Environment. Radio sources in high-mass central galaxies are common, similarly so for elliptical and S0 galaxies, with a frequency that increases with the halo mass. Emission-line active galactic nuclei (mostly LINERs) are more common in S0s, but show no strong trends with Environment.

  • The Relation between galaxy morphology and Environment in the local universe: an RC3-SDSS picture
    The Astrophysical Journal, 2012
    Co-Authors: David J. Wilman, Peter Erwin
    Abstract:

    We present an analysis of the z ~ 0 morphology-Environment Relation for 911 bright (M_B 10^10.5 Msol galaxies are S0 regardless of halo mass, but satellite S0 galaxies are only found in massive (> 10^13 h^-1 Msol) halos, where they are 69+/-4% of the M_* > 10^10.5 Msol satellite population. This suggests two channels for S0 formation: one for central galaxies, and another which transforms lower mass (M_*

  • the Relation between galaxy morphology and Environment in the local universe an rc3 sdss picture
    arXiv: Cosmology and Nongalactic Astrophysics, 2011
    Co-Authors: David J. Wilman, Peter Erwin
    Abstract:

    We present an analysis of the z ~ 0 morphology-Environment Relation for 911 bright (M_B 10^10.5 Msol galaxies are S0 regardless of halo mass, but satellite S0 galaxies are only found in massive (> 10^13 h^-1 Msol) halos, where they are 69+/-4% of the M_* > 10^10.5 Msol satellite population. This suggests two channels for S0 formation: one for central galaxies, and another which transforms lower mass (M_* <~ 10^11 Msol) accreted spirals into satellite S0 galaxies in massive halos. Analysis of finer morphological structure (bars and rings in disk galaxies) shows some trends with stellar mass, but none with halo mass; this is consistent with other recent studies which indicate that bars are not strongly influenced by galaxy Environment. Radio sources in high-mass central galaxies are common, similarly so for elliptical and S0 galaxies, with a frequency that increases with halo mass. Emission-line AGN (mostly LINERs) are more common in S0s, but show no strong Environmental trends (abridged).

Alberto Cattaneo - One of the best experts on this subject based on the ideXlab platform.

  • Perceived educational usefulness of a virtual-reality work situation depends on the spatial human-Environment Relation
    Research in Learning Technology, 2021
    Co-Authors: Martin Dobricki, Kevin Gonyop Kim, Alessia Eletta Coppi, Pierre Dillenbourg, Alberto Cattaneo
    Abstract:

    Virtual reality (VR) may be useful for situating school-based vocational education in work-life by simulating a work situation such that learners viewing this VR work situation are located inside it. The reason for this assumption is that VR can fully spatially include its viewer. Research on the utility of viewer-including VR work situations for learners has, therefore, already started. However, no study has yet investigated their utility for teachers. This is particularly relevant for work situations involving Environmental planning, as VR is expected to facilitate such a task. We, therefore, asked horticultural teachers to assess the educational usefulness of a VR work situation when they were located outside and inside it. For this purpose, we enabled them to plan a basic garden in the VR work situation when its Environment was spatially excluding them and when it was including them. We found the teachers to perceive the viewer-including VR work situation as more useful for their teaching than its viewer-excluding version. This suggests that the perceived educational usefulness of a VR work situation depends on the spatial Relation of its viewer and Environment, that is, the spatial human-Environment Relation it involves.

David J. Wilman - One of the best experts on this subject based on the ideXlab platform.

  • the Relation between galaxy morphology and Environment in the local universe an rc3 sdss picture
    The Astrophysical Journal, 2012
    Co-Authors: David J. Wilman, Peter Erwin
    Abstract:

    We present results of an analysis of the local (z ~ 0) morphology-Environment Relation for 911 bright (MB 1010.5 M ☉ are S0 regardless of halo mass, but satellite S0 galaxies are only found in massive (>1013 h –1 M ☉) halos, where they are 69% ± 4% of the M * > 1010.5 M ☉ satellite population. This suggests two channels for forming S0 galaxies: one which operates for central galaxies and another which transforms lower-mass ( M * 1011 M ☉) accreted spirals into satellite S0 galaxies in massive halos. Analysis of finer morphological structure (bars and rings in disk galaxies) shows some trends with stellar mass, but none with halo mass; this is consistent with other recent studies which indicate that bars are not strongly influenced by galaxy Environment. Radio sources in high-mass central galaxies are common, similarly so for elliptical and S0 galaxies, with a frequency that increases with the halo mass. Emission-line active galactic nuclei (mostly LINERs) are more common in S0s, but show no strong trends with Environment.

  • The Relation between galaxy morphology and Environment in the local universe: an RC3-SDSS picture
    The Astrophysical Journal, 2012
    Co-Authors: David J. Wilman, Peter Erwin
    Abstract:

    We present an analysis of the z ~ 0 morphology-Environment Relation for 911 bright (M_B 10^10.5 Msol galaxies are S0 regardless of halo mass, but satellite S0 galaxies are only found in massive (> 10^13 h^-1 Msol) halos, where they are 69+/-4% of the M_* > 10^10.5 Msol satellite population. This suggests two channels for S0 formation: one for central galaxies, and another which transforms lower mass (M_*

  • the Relation between galaxy morphology and Environment in the local universe an rc3 sdss picture
    arXiv: Cosmology and Nongalactic Astrophysics, 2011
    Co-Authors: David J. Wilman, Peter Erwin
    Abstract:

    We present an analysis of the z ~ 0 morphology-Environment Relation for 911 bright (M_B 10^10.5 Msol galaxies are S0 regardless of halo mass, but satellite S0 galaxies are only found in massive (> 10^13 h^-1 Msol) halos, where they are 69+/-4% of the M_* > 10^10.5 Msol satellite population. This suggests two channels for S0 formation: one for central galaxies, and another which transforms lower mass (M_* <~ 10^11 Msol) accreted spirals into satellite S0 galaxies in massive halos. Analysis of finer morphological structure (bars and rings in disk galaxies) shows some trends with stellar mass, but none with halo mass; this is consistent with other recent studies which indicate that bars are not strongly influenced by galaxy Environment. Radio sources in high-mass central galaxies are common, similarly so for elliptical and S0 galaxies, with a frequency that increases with halo mass. Emission-line AGN (mostly LINERs) are more common in S0s, but show no strong Environmental trends (abridged).

Martin Dobricki - One of the best experts on this subject based on the ideXlab platform.

  • Perceived educational usefulness of a virtual-reality work situation depends on the spatial human-Environment Relation
    Research in Learning Technology, 2021
    Co-Authors: Martin Dobricki, Kevin Gonyop Kim, Alessia Eletta Coppi, Pierre Dillenbourg, Alberto Cattaneo
    Abstract:

    Virtual reality (VR) may be useful for situating school-based vocational education in work-life by simulating a work situation such that learners viewing this VR work situation are located inside it. The reason for this assumption is that VR can fully spatially include its viewer. Research on the utility of viewer-including VR work situations for learners has, therefore, already started. However, no study has yet investigated their utility for teachers. This is particularly relevant for work situations involving Environmental planning, as VR is expected to facilitate such a task. We, therefore, asked horticultural teachers to assess the educational usefulness of a VR work situation when they were located outside and inside it. For this purpose, we enabled them to plan a basic garden in the VR work situation when its Environment was spatially excluding them and when it was including them. We found the teachers to perceive the viewer-including VR work situation as more useful for their teaching than its viewer-excluding version. This suggests that the perceived educational usefulness of a VR work situation depends on the spatial Relation of its viewer and Environment, that is, the spatial human-Environment Relation it involves.

Rick W Steketee - One of the best experts on this subject based on the ideXlab platform.

  • Geographical patterns and predictors of malaria risk in Zambia: Bayesian geostatistical modelling of the 2006 Zambia national malaria indicator survey (ZMIS).
    Malaria journal, 2010
    Co-Authors: Nadine Riedel, Penelope Vounatsou, John M. Miller, Laura Gosoniu, Elizabeth Chizema-kawesha, Victor Mukonka, Rick W Steketee
    Abstract:

    The Zambia Malaria Indicator Survey (ZMIS) of 2006 was the first nation-wide malaria survey, which combined parasitological data with other malaria indicators such as net use, indoor residual spraying and household related aspects. The survey was carried out by the Zambian Ministry of Health and partners with the objective of estimating the coverage of interventions and malaria related burden in children less than five years. In this study, the ZMIS data were analysed in order (i) to estimate an empirical high-resolution parasitological risk map in the country and (ii) to assess the Relation between malaria interventions and parasitaemia risk after adjusting for Environmental and socio-economic confounders. The parasitological risk was predicted from Bayesian geostatistical and spatially independent models relating parasitaemia risk and Environmental/climatic predictors of malaria. A number of models were fitted to capture the (potential) non-linearity in the malaria-Environment Relation and to identify the elapsing time between Environmental effects and parasitaemia risk. These models included covariates (a) in categorical scales and (b) in penalized and basis splines terms. Different model validation methods were used to identify the best fitting model. Model-based risk predictions at unobserved locations were obtained via Bayesian predictive distributions for the best fitting model. Model validation indicated that linear Environmental predictors were able to fit the data as well as or even better than more complex non-linear terms and that the data do not support spatial dependence. Overall the averaged population-adjusted parasitaemia risk was 20.0% in children less than five years with the highest risk predicted in the northern (38.3%) province. The odds of parasitaemia in children living in a household with at least one bed net decreases by 40% (CI: 12%, 61%) compared to those without bed nets. The map of parasitaemia risk together with the prediction error and the population at risk give an important overview of the malaria situation in Zambia. These maps can assist to achieve better resource allocation, health management and to target additional interventions to reduce the burden of malaria in Zambia significantly. Repeated surveys will enable the evaluation of the effectiveness of on-going interventions.