64 research outputs found
The close circumstellar environment of the semi-regular S-type star Pi^1 Gruis
We study the close circumstellar environment of the nearby S-type star Pi^1
Gruis using high spatial-resolution, mid-infrared observations from the
ESO/VLTI. Spectra and visibilities were obtained with the MIDI interferometer
on the VLT Auxiliary Telescopes. The cool M5III giant Beta Gruis was used as
bright primary calibrator, and a dedicated spectro-interferometric study was
undertaken to determine its angular diameter accurately. The MIDI measurements
were fitted with the 1D numerical radiative transfer code DUSTY to determine
the dust shell parameters of Pi^1 Gruis. Taking into account the low spatial
extension of the model in the 8-9 m spectral band for the smallest
projected baselines, we consider the possibility of a supplementary molecular
shell. The MIDI visibility and phase data are mostly dominated by the spherical
21 mas (694 Rsol) central star, while the extended dusty environment is
over-resolved even with the shortest baselines. No obvious departure from
spherical symmetry is found on the milliarcsecond scale. The
spectro-interferometric observations are well-fitted by an optically thin
(tau(dust)<0.01 in the band) dust shell that is located at about 14 stellar
radii with a typical temperature of 700 K and composed of 70% silicate and 30%
of amorphous alumina grains. An optically thin (tau(mol)<0.1 in the N band)
H2O+SiO molecular shell extending from the photosphere of the star up to 4.4
stellar radii with a typical temperature of 1000 K is added to the model to
improve the fit in the 8-9 m spectral band. We discuss the probable binary
origin of asymmetries as revealed by millimetric observations
In the shadow of fortress Europe? Impacts of European migration governance on Slovenia, Croatia and Macedonia
This article analyses European integration's effects on migration and border security governance in Slovenia, Croatia and Macedonia in the context of âgoverned interdependenceâ. We show how transgovernmental networks comprising national and EU actors, plus a range of other participants, blur the distinction between the domestic and international to enable interactions between domestic and international policy elites that transmit EU priorities into national policy. Governments are shown to be âwilling pupilsâ and âpolicy takersâ, adapting to EU policy as a pre-condition for membership. This strengthened rather than weakened central state actors, particularly interior ministries. Thus, in a quintessentially ânationalâ policy area, there has been a re-scaling and re-constitution of migration and border security policy. To support this analysis, social network analysis is used to outline the composition of governance networks and analyse interactions and power relations therein
Interpol and the Emergence of Global Policing
This chapter examines global policing as it takes shape through the work of Interpol, the International Criminal Police Organization. Global policing emerges in the legal, political and technological amalgam through which transnational police cooperation is carried out, and includes the police practices inflected and made possible by this phenomenon. Interpolâs role is predominantly in the circulation of information, through which it enters into relationships and provides services that affect aspects of governance, from the local to national, regional and global. The chapter describes this assemblage as a noteworthy experiment in developing what McKeon called a frame for common action. Drawing on Interpol publications, news stories, interviews with staff, and fieldwork at the General Secretariat in Lyon, France, the history, institutional structure, and daily practices are described. Three cases are analyzed, concerning Red Notices, national sovereignty, and terrorism, in order to explore some of the problems arising in Interpolâs political and technical operating arrangements. In conclusion, international and global policing are compared schematically, together with Interpolâs attempts to give institutional and procedural direction to the still-evolving form of global policing
Policing a Negotiated World: A Partial Test of Klingerâs Ecological Theory of Policing
The primary goal of the current study is to examine a portion of Klingerâs theory. Specifically, we test the influence of organizational and environmental contextual factors, guided by Klingerâs theory, on one measure of officer vigor. To date, few studies have taken this approach to examine Klingerâs theory. The study builds on prior research that has tested aspects of Klingerâs theory and adds new analytic strategies that prior studies have not used. The results of this study have implications for both theory and practice, and they add to the growing literature examining the influence of ecological and organization factors on police behavior
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