6,555 research outputs found
The Stages of Change in three stage concepts and two modes of physical activity: a comparison of stage distributions and practical implications
Stages of Change were assessed for three stage definitions and two modes of health-enhancing physical activity (HEPA) in a representative telephone survey in Switzerland (participation 55.8%; n = 1471). Two five-stage definitions focusing either on intention to change or current behavior were integrated into a seven-stage concept, taking into account both aspects. The two target behaviors were activities with at least moderate intensity and activities with vigorous intensity. According to the two five-stage definitions, at least half of the participants were either in precontemplation (focus on intention) or in preparation (focus on behavior). Upon classification into the seven stages these large stage groups were differentiated. There were differences in the pros for change between the new stages of the seven-stage concept. One in seven participants was regularly active according to the moderate criteria, but not using the vigorous criteria, and one in every eight participants reported the inverse. Results show that an individual can be in different Stages of Change depending on the stage definition and be regularly active or not depending on the target behavior. The practical implications of the seven-stage algorithm and a two-dimensional matrix to classify participants for both moderate and vigorous intensity activities in an Internet-based HEPA program are presente
Evaluation of the local physical activity and sport network in Nendaz: results of two cross-sectional population-based surveys
The aim of local physical activity and sport networks in Switzerland is to improve co-operation between different players in physical activity and sport promotion in a community, town or region. Nendaz has introduced such a network in 2004. Two postal questionnaire surveys were carried out in 2005 and 2007. The local network in Nendaz reached a high level of awareness, its utilisation in the population and satisfaction were generally good. Physical activity behaviour was high in both years compared to the general French-speaking population in Switzerland. In order to judge the effects of such an intervention on the population level, baseline surveys should be carried out before the start of the project and control communities should be studied simultaneously
Atmospheric science
The following types of experiments for a proposed Space Station Microgravity Particle Research Facility are described: (1) growth of liquid water drop populations; (2) coalescence; (3) drop breakup; (4) breakup of freezing drops; (5) ice nucleation for large aerosols or bacteria; (6) scavenging of gases, for example, SO2 oxidation; (7) phoretic forces, i.e., thermophoresis versus diffusiophoresis; (8) Rayleigh bursting of drops; (9) charge separation due to collisions of rimed and unrimed ice; (10) charged drop dynamics; (11) growth of particles in other planetary atmospheres; and (12) freezing and liquid-liquid evaporation. The required capabilities and desired hardware for the facility are detailed
Anterior Lumbar Interbody Implants: Importance of the Interdevice Distance
Object. The implantation of interbody fusion cages allows for the restoration of disc height and the enlargement of the neuroforaminal space. The purpose of this study was to compare the extent of subsidence occurring after conventional cage placement compared to a novel wider cage placement technique.
Methods. This study is a retrospective evaluation of radiographs of patients who underwent stand-alone single level anterior lumbar interbody fusion with lordotic titanium cages and rhBMP-2. Fifty-three patients were evaluated: 39 patients had wide cage placement (6 mm interdevice distance) and 14 had narrow cage placement (2 mm interdevice distance). Anterior and posterior intervertebral disc space heights were measured post-operatively and at follow-up imaging.
Results. The decrease in anterior intervertebral disc space height was 2.05 mm versus 3.92 mm (P < .005) and 1.08 mm versus 3.06 mm in posterior disc space height for the wide cage placement and the narrow cage placement respectively. The proportion of patients with subsidence greater than 2 mm was 41.0% in the wide cage patients and 85.7% for the narrow cage patients (P < .005).
Conclusions. The wider cage placement significantly reduced the amount of subsidence while allowing for a greater exposed surface area for interbody fusion
Infrared point source variability between the Spitzer and MSX surveys of the Galactic mid-plane
We present a list of 552 sources with suspected variability, based on a
comparison of mid-infrared photometry from the GLIMPSE I and MSX surveys, which
were carried out nearly a decade apart. We were careful to address issues such
as the difference in resolution and sensitivity between the two surveys, as
well as the differences in the spectral responses of the instruments. We
selected only sources where the IRAC 8.0 and MSX 8.28 micron fluxes differ by
more than a factor of two, in order to minimize contamination from sources
where the difference in fluxes at 8 micron is due to a strong 10 micron
silicate feature. We present a subset of 40 sources for which additional
evidence suggests variability, using 2MASS and MIPSGAL data. Based on a
comparison with the variability flags in the IRAS and MSX Point-Source Catalogs
we estimate that at least a quarter of the 552 sources, and at least half of
the 40 sources are truly variable. In addition, we tentatively confirm the
variability of one source using multi-epoch IRAS LRS spectra. We suggest that
most of the sources in our list are likely to be Asymptotic Giant Branch stars.Comment: 47 pages, 12 Figures, 3 Tables, accepted for publication in A
Limits on Superconductivity-Related Magnetization in SrRuO and PrOsSb from Scanning SQUID Microscopy
We present scanning SQUID microscopy data on the superconductors Sr2RuO4 (Tc
= 1.5 K) and PrOsSb (Tc = 1.8 K). In both of these materials,
superconductivity-related time-reversal symmetry-breaking fields have been
observed by muon spin rotation; our aim was to visualize the structure of these
fields. However in neither SrRuO nor PrOsSb do we observe
spontaneous superconductivity-related magnetization. In SrRuO, many
experimental results have been interpreted on the basis of a
superconducting order parameter. This order parameter is expected to give
spontaneous magnetic induction at sample edges and order parameter domain
walls. Supposing large domains, our data restrict domain wall and edge fields
to no more than ~0.1% and ~0.2% of the expected magnitude, respectively.
Alternatively, if the magnetization is of the expected order, the typical
domain size is limited to ~30 nm for random domains, or ~500 nm for periodic
domains.Comment: 8 pages, 7 figures. Submitted to Phys. Rev.
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