245 research outputs found
Astrometric observations of Phobos and Deimos during the 1971 opposition of Mars
Accurate positional measurements of planets and satellites are used to
improve our knowledge of their dynamics and to infer the accuracy of planet and
satellite ephemerides. In the framework of the FP7 ESPaCE project, we provide
the positions of Mars, Phobos, and Deimos taken with the U.S. Naval Observatory
26-inch refractor during the 1971 opposition of the planet. These plates were
measured with the digitizer of the Royal Observatory of Belgium and reduced
through an optimal process that includes image, instrumental, and spherical
corrections to provide the most accurate data. We compared the observed
positions of the planet Mars and its satellites with the theoretical positions
from INPOP10 and DE430 planetary ephemerides, and from NOE and MAR097 satellite
ephemerides. The rms residuals in RA and Dec. of one position is less than 60
mas, or about 20 km at Mars. This accuracy is comparable to the most recent CCD
observations. Moreover, it shows that astrometric data derived from
photographic plates can compete with those of old spacecraft (Mariner 9, Viking
1 and 2).Comment: 5 pages, 3 figure
Onderzoek naar de relatie tussen persoonskenmerken en het verlangen naar informele hiërarchie in Belgische bedrijven.
Job insecurity, employability and satisfaction among temporary and permanent employees in post-crisis Europe
Earlier studies established that perceived job insecurity is more strongly related to the experiences of permanent employees, and conversely that perceived employability is more strongly related to the experiences of temporary employees. We challenge these results against the background of the 2008/2009 crisis using samples from the 2010 European Social Survey with employees from Continental and Mediterranean Europe. First, we argue that job insecurity has become a structural phenomenon that associates with temporary and permanent employees’ satisfaction in the same fashion, which found overall support. Second, we argue that employability may have become important for all employees, regardless of contract type, which was largely supported. A cause for concern is that the relationship between perceived job insecurity and satisfaction was comparatively stronger than the relationship between perceived employability and satisfaction. This may suggest that employees have not yet fully embraced ideas about employability as the new form of security
Using indirect measurement tasks to assess the self-concept of personality : a systematic review and meta-analyses
Epilectic seizure due to neuroglial cyst
Background: A 41-year-old woman without a relevant history was admitted to the emergency department after an epileptic seizure
The uneven weight distribution between predators and prey: Comparing gut fill between terrestrial herbivores and carnivores.
The general observation that secondary consumers ingest highly digestible food and have simple short guts and small abdominal cavities intuitively results in the assumption that mammalian carnivores carry less digesta in their gut compared to herbivores. Due to logistic constraints, this assumption has not been tested quantitatively so far. In this contribution, we estimated the dry matter gut contents (DMC) for 25 species of the order Carnivora (including two strictly herbivorous ones, the giant and the red panda) using the physical 'Occupancy Principle', based on a literature data collection on dry matter intake (DMI), apparent dry matter digestibility (aD DM) and retention time (RT), and compared the results to an existing collection for herbivores. Scaling exponents with body mass (BM) for both carnivores and herbivores were in the same range with DMI ~ BM0.75; aD DM ~ BM0; RT ~ BM0.11 and DMC ~ BM0.88. The trophic level (carnivore vs herbivore) significantly affected all digestive physiology parameters except for RT. Numerically, the carnivore DMI level reached 77%, the RT 32% and DMC only 29% of the corresponding herbivore values, whereas the herbivore aD DM only reached 82% of that of carnivores. Thus, we quantitatively show that carnivores carry less inert mass or gut content compared to herbivores, which putatively benefits them in predator-prey interactions and might have contributed to the evolution towards unguligradism in herbivores. As expected, the two panda species appeared as outliers in the dataset with low aD DM and RT for a herbivore but extremely high DMI values, resulting in DMC in the lower part of the herbivore range. Whereas the difference in DMI and DMC scaling in herbivores might allow larger herbivores to compensate for lower diet quality by ingesting more, this difference may allow larger carnivores not to go for less digestible prey parts, but mainly to increase meal intervals, i.e. not having to hunt on a daily basis
Bimekizumab infection rates in patients with moderate to severe plaque psoriasis: Analysis of pooled data from 2 years of treatment in phase 3 and 3b clinical trials
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Put My Skills to Use? Understanding the Joint Effect of Job Security and Skill Utilization on Job Satisfaction Between Skilled Migrants and Australian Born Workers in Australia
The topic of skilled migrants has gained importance in the past decade as they are increasingly becoming one of the main drivers for labor supply in developed countries like Australia. Although there is research on skilled migrants, most have been studied from the perspectives of (un)employment, wage and over-education. Some evidence suggests that skilled migrants are often less satisfied with their job compared to their local counterparts, yet little is known about why these differences exist. Using a nationally representative sample of Australian workers, we examine how two important job characteristics, job security and skill utilization, exert their differential interaction effect on job satisfaction for skilled migrants and Australian born workers. We found a differential moderation effect between job security and skill utilization for skilled migrants and Australian born workers. For skilled migrants, high job security did not lead to positive reaction (i.e., job satisfaction), as this effect was dependent on their skill utilization; while such moderation effect was not present for Australian born workers. This study highlights the need to take a more fine-tuned approach by understanding target sample groups (e.g., skilled migrants) when study the relationship between key job characteristics and job satisfaction. Furthermore, it highlights the importance for organizations to revisit their human resource management strategies and policies to recognize the needs for enhancing skill utilization for skilled migrants
On the variation of the fine-structure constant: Very high resolution spectrum of QSO HE 0515-4414
We present a detailed analysis of a very high resolution (R\approx 112,000)
spectrum of the quasar HE 0515-4414 obtained using the High Accuracy Radial
velocity Planet Searcher (HARPS) mounted on the ESO 3.6 m telescope at the La
Silla observatory. The HARPS spectrum, of very high wavelength calibration
accuracy (better than 1 m\AA), is used to search for possible systematic
inaccuracies in the wavelength calibration of the UV Echelle Spectrograph
(UVES) mounted on the ESO Very Large Telescope (VLT). We have carried out
cross-correlation analysis between the Th-Ar lamp spectra obtained with HARPS
and UVES. The shift between the two spectra has a dispersion around zero of
\sigma\simeq 1 m\AA. This is well within the wavelength calibration accuracy of
UVES (i.e \sigma\simeq 4 m\AA). We show that the uncertainties in the
wavelength calibration induce an error of about, \Delta\alpha/\alpha\le
10^{-6}, in the determination of the variation of the fine-structure constant.
Thus, the results of non-evolving \Delta\alpha/\alpha reported in the
literature based on UVES/VLT data should not be heavily influenced by problems
related to wavelength calibration uncertainties. Our higher resolution spectrum
of the z_{abs}=1.1508 damped Lyman-\alpha system toward HE 0515-4414 reveals
more components compared to the UVES spectrum. Using the Voigt profile
decomposition that simultaneously fits the high resolution HARPS data and the
higher signal-to-noise ratio UVES data, we obtain,
\Delta\alpha/\alpha=(0.05\pm0.24)x10^{-5} at z_{abs}=1.1508. This result is
consistent with the earlier measurement for this system using the UVES spectrum
alone.Comment: 14 pages, 13 figures, Accepted in A&
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