9,444 research outputs found
Hutterite Colonies and the Cultural Landscape: An Inventory of Selected Site Characteristics
Hutterite colonies are a growing and sustainable element in the cultural landscape of the Canadian Prairies and Northern Great Plains of the United States. Their increasing numbers do something to offset the disappearance of the smallest service centers on the plains. While the diffusion of these communities has been well documented, the morphology of the settlements has been less well studied. New technology makes it possible to remotely evaluate selected characteristics of almost all Hutterite colonies. This paper describes the differences, with respect to orientation, layout and housing types, both between the four clan groups and within the Dariusleut and Schmiedeleut. Here as in many other aspects of Hutterite culture, there are signs of change and increasing diversity
The massive multiple system HD 64315
The O6 Vn star HD 64315 is believed to belong to the star-forming region
known as NGC 2467, but previous distance estimates do not support this
association. We explore the multiple nature of this star with the aim of
determining its distance, and understanding its connection to NGC 2467. A total
of 52 high-resolution spectra have been gathered over a decade. We use their
analysis, in combination with the photometric data from All Sky Automated
Survey and Hipparcos catalogues, to conclude that HD 64315 is composed of at
least two spectroscopic binaries, one of which is an eclipsing binary. HD 64315
contains two binary systems, one of which is an eclipsing binary. The two
binaries are separated by 0.09 arcsec (or 500 AU) if the most likely distance
to the system, around 5 kpc, is considered. The presence of fainter companions
is not excluded by current observations. The non-eclipsing binary (HD 64315
AaAb) has a period of 2.70962901+/-0.00000021 d. Its components are hotter than
those of the eclipsing binary, and dominate the appearance of the system. The
eclipsing binary (HD 64315 BaBb) has a shorter period of 1.0189569+/-0.0000008
d. We derive masses of 14.6+-2.3 M for both components of the BaBb
system. They are almost identical; both stars are overfilling their respective
Roche lobes, and share a common envelope in an overcontact configuration. The
non-eclipsing binary is a detached system composed of two stars with spectral
types around O6 V with minimum masses of 10.8 M and 10.2 M, and
likely masses aprox. 30 M. HD 64315 provides a cautionary tale about
high-mass star isolation and multiplicity. Its total mass is likely above 90
M,but it seems to have formed without an accompanying cluster. It
contains one the most massive overcontact binaries known, a likely merger
progenitor in a very wide multiple system.Comment: 14 pages, 13 figures, 8 Table
Older people’s perspectives on living in integrated housing and care settings: the case of extra care housing
Purpose
This paper explores residents’ perceptions and experiences of extra care housing as an integrated model of housing with care.
Design
Data were collected in a longitudinal qualitative study based in four extra care housing schemes. Interviews were held with residents, care workers, managers and local commissioners. Data were analysed thematically.
Findings
The study found that the integration of housing with care enabled many older people to manage their care proactively. However, the increasing number of residents with complex health and care needs led some residents to question the ability of the model to support residents to live independently when living with chronic illness.
Research limitations
The study struggled to recruit sufficient residents from the specialist dementia setting who were able to communicate their consent to take part in the research. In addition, the quality of qualitative data collected in interviews with participants at this setting reduced over successive rounds of interviews.
Implications
The study suggests the need to ensure residents are fully appraised of what levels of care and support are available when they decide to move into extra care housing schemes.
Originality
This paper provides a timely opportunity to consider extra care housing as an example of an integrated housing service, particularly in light of the current challenges facing the sector
Asymmetric quantum error correction via code conversion
In many physical systems it is expected that environmental decoherence will
exhibit an asymmetry between dephasing and relaxation that may result in qubits
experiencing discrete phase errors more frequently than discrete bit errors. In
the presence of such an error asymmetry, an appropriately asymmetric quantum
code - that is, a code that can correct more phase errors than bit errors -
will be more efficient than a traditional, symmetric quantum code. Here we
construct fault tolerant circuits to convert between an asymmetric subsystem
code and a symmetric subsystem code. We show that, for a moderate error
asymmetry, the failure rate of a logical circuit can be reduced by using a
combined symmetric asymmetric system and that doing so does not preclude
universality.Comment: 5 pages, 8 figures, presentation revised, figures and references
adde
Complicated variations of early optical afterglow of GRB 090726
We report on a detection of an early rising phase of optical afterglow (OA)
of a long GRB 090726. We resolve a complicated profile of the optical light
curve. We also investigate the relation of the optical and X-ray emission of
this event. We make use of the optical photometry of this OA obtained by the
0.5 m telescope of AI AS CR, supplemented by the data obtained by other
observers, and the X-ray Swift/XRT data.
The optical emission peaked at ~ 17.5 mag (R) at t-T0 ~ 500 s. We find a
complex profile of the light curve during the early phase of this OA: an
approximately power-law rise, a rapid transition to a plateau, a weak flare
superimposed on the center of this plateau, and a slowly steepening early
decline followed by a power-law decay. We discuss several possibilities to
explain the short flare on the flat top of the optical light curve at t-T0 ~
500 s; activity of the central engine is favored although reverse shock cannot
be ruled out. We show that power-law outflow with Theta_obs/Theta_c > 2.5 is
the best case for OA of GRB 090726. The initial Lorentz factor is Gamma_0 ~
230-530 in case of propagation of the blast wave in a homogeneous medium, while
propagation of this wave in a wind environment gives Gamma_0 ~ 80-300. The
value of Gamma_0 in GRB 090726 thus falls into the lower half of the range
observed in GRBs and it may even lie on the lower end. We also show that both
the optical and X-ray emission decayed simultaneously and that the spectral
profile from X-ray to the optical band did not vary. This OA belongs to the
least luminous ones in the phase of its power-law decay corresponding to that
observed for the ensemble of OAs of long GRBs.Comment: 5 pages, 5 figures, accepted to A&
Rough ends of infinite primitive permutation groups
If G is a group of permutations of a set Omega , then the suborbits of G are the orbits of point-stabilisers G_\alpha acting on Omega. The cardinalities of these suborbits are the subdegrees of G. Every infinite primitive permutation group G with finite subdegrees acts faithfully as a group of automorphisms of a locally-finite connected vertex-primitive directed graph Gamma with vertex set Omega, and there is consequently a natural action of G on the ends of Gamma.
We show that if G is closed in the permutation topology of pointwise convergence, then the structure of G is determined by the length of any orbit of G acting on the ends of Gamma.
Examining the ends of a Cayley graph of a finitely generated group to determine the structure of the group is often fruitful. B. Krön and R. G. Möller have recently generalised the Cayley graph to
what they call a rough Cayley graph, and they call the ends of this graph the rough ends of the group.
It transpires that the ends of Gamma are the rough ends of G, and so our result is equivalent to saying that the structure of a closed primitive group G whose subdegrees are all finite is determined by the length of any orbit of G on its rough ends
An Untargeted Metabolomics Analysis of Antipsychotic Use in Bipolar Disorder
BackgroundSecond generation antipsychotic (SGA) use in bipolar disorder is common and has proven effective in short‐term trials. There continues to be a lack of understanding of the mechanisms underlying many of their positive and negative effects in bipolar disorder. This study aimed to describe the metabolite profiles of bipolar subjects treated with SGAs by comparing to metabolite profiles of bipolar subjects treated with lithium, and schizophrenia subjects treated with SGAs.MethodsCross‐sectional, fasting untargeted serum metabolomic profiling was conducted in 82 subjects diagnosed with bipolar I disorder (n = 30 on SGAs and n = 32 on lithium) or schizophrenia (n = 20). Metabolomic profiles of bipolar subjects treated with SGAs were compared to bipolar subjects treated with lithium and schizophrenia subjects treated with SGAs using multivariate methods.ResultsPartial lease square discriminant analysis (PLS‐DA) plots showed separation between bipolar subjects treated with SGAs, bipolar subjects treated with lithium, or schizophrenia subjects treated with SGAs. Top influential metabolite features were associated with several pathways including that of polyunsaturated fatty acids, pyruvate, glucose, and branched chain amino acids.ConclusionsThe findings from this study require further validation in pre‐ and posttreated bipolar and schizophrenia subjects, but suggest that the pharmacometabolome may be diagnosis specific.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/115928/1/cts12324.pd
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