653 research outputs found
Comparative Manpower Strategies
Dans cet article, l'Auteur traite des moyens qui sont utilisés dans les pays membres de l'OCDE pour planifier leur politique en matière de main-d'oeuvre. Pour en comprendre le sens et la portée, il faut les considérer à la lumière du développement économique de chaque pays.Lorsqu'une nation est au premier stade de son développement industriel alors que les revenus sont relativement peu élevés, le gouvernement accorde généralement priorité à la création d'entreprises nouvelles, à la croissance des investissements et à l'expansion des marchés d'exportation. Il met l'accent sur la mise en place des infrastructures: transports, sources d'énergie, moyens de communications. Il consacre aussi beaucoup de ressources à l'éducation et à la santé. De là, il découle que les programmes de main-d'oeuvre tiennent une place plutôt secondaire dans les préoccupations de l'État.Ce n'est que plus tard, que les gouvernements en viennent à concentrer plus d'efforts sur des programmes de main-d'oeuvre qui sont la conséquence d'un haut degré d'urbanisation et d'industrialisation, où les progrès technologiques sont rapides, où les postes de travail deviennent vite désuets, où des qualifications professionnelles nouvelles et toujours plus spécialisées s'imposent.En deuxième lieu, les programmes de main-d'oeuvre ont pour objet de favoriser la mobilité professionnelle, territoriale et industrielle des travailleurs, principalement ceux qui ne sont pas protégés par des conventions collectives de travail. En Europe, par exemple, la formation de la main-d'oeuvre repose principalement sur les épaules des agents économiques, syndicats et employeurs, alors que, aux États-Unis et au Canada, l'initiative a été prise la plupart du temps par les gouvernements.En troisième lieu, l'Auteur fait remarquer que le choix des gouvernements a été influencé par les coûts, d'où l'existence de deux tendances diverses. L'une de ces tendances consiste à faire absorber presque exclusivement le coût de la formation de la main-d'oeuvre par les employeurs. À l'opposé, il y a des pays où le gouvernement établit les politiques de main-d'oeuvre directement à même ses revenus sans en imposer le fardeau aux employeurs. Dans la plupart des pays de l'OCDE, on retrouve un chevauchement des deux systèmes. Il faut aussi ajouter à cela le phénomène de la création et de la conservation directes d'emplois à des fins de développement régional.En résumé, on peut dire que chacun des vingt-quatre pays membres de l'organisation possède son propre système de politiques de main-d'oeuvre que l'Auteur analyse brièvement pour les pays suivants: Canada, États-Unis, Japon, Suède, Allemagne, France, Grande-Bretagne. Il en retient qu'un système peut impliquer la coopération des associations de travailleurs et des employeurs, l'État agissant au niveau national. Sous un autre régime, il n'y aura guère de collaboration patronale-syndicale, les politiques de main-d'oeuvre relevant de l'action directe de l'État. Enfin, un troisième système repose presque entièrement sur les employeurs, ce qui ne laisse qu'une responsabilité résiduelle au gouvernement.The author presents a comparison of how different member countries of the OECD have developed their man-power strategies over the past decade in light of the unique institutional and cultural circumstances
Taux de roulement et permanence de l’emploi dans l’industrie canadienne
This study poses the question: "How long will the average new employee likely stay with his employer? This question has considerable relevance to the study of labour market activity, and to the obverse question: "How likely will a person, once employed, be unemployed again?" This paper explores the relevance of the tenure question on a number of fronts, and then develops a simple model for estimating the expected tenure of workers joining specific industries in Canada. Although the findings are based on somewhat dated statistics and lack a vector related to age, sex and other personal characteristics, they nonetheless confirm within reasonable degrees of confidence that the average new employee will remain with his employer a remarkably short time—less than two years in most industries and only a few months in some others. They suggest that employers are wise to defer costly training, pension and other non-wage expenditures until their new employees have built up some attachment to the firm. By the same token they affirm the usefulness of public income support programs to tide those who are laid off or quit through the transition to their next job, and for public retraining and mobility facilities to make the investments in human skills and allocation that employers will not.
Properties of Calcium Caseinates With Disparate Performance in Imitation Cheese
Two commercial lots of calcium caseinate preparations differing in performance imitation cheese were analyzed for various characteristics. A imitation process cheese manufacturing classified the caseinates as good or poor based on appearances of the finished cheese, emulsification of fat, oiling-off during sheeting and melting properties. The sample which exhibited good functional properties in imitation cheese, had slightly higher calcium (16.4 mg/g protein), non-casein protein (2.87%) and y-casein contents, a higher formal titre (8.95 mg free amino N/g protein), lower water absorption (138 mg/100 g protein), and lower stability to added calcium (8.0 min) than did the other sample (14.6 mg/g, 1.66%, 8.02 mg/g, 129 mg/100 g, and 15 min, respectively), which was described as having poor functionality according to the criteria of the imitation cheese producer
Resolving the Submillimeter Background: the 850-micron Galaxy Counts
Recent deep blank field submillimeter surveys have revealed a population of
luminous high redshift galaxies that emit most of their energy in the
submillimeter. The results suggest that much of the star formation at high
redshift may be hidden to optical observations. In this paper we present
wide-area 850-micron SCUBA data on the Hawaii Survey Fields SSA13, SSA17, and
SSA22. Combining these new data with our previous deep field data, we establish
the 850-micron galaxy counts from 2 mJy to 10 mJy with a >3-sigma detection
limit. The area coverage is 104 square arcmin to 8 mJy and 7.7 square arcmin to
2.3 mJy. The differential 850-micron counts are well described by the function
n(S)=N_0/(a+S^3.2), where S is the flux in mJy, N_0=3.0 x 10^4 per square
degree per mJy, and a=0.4-1.0 is chosen to match the 850-micron extragalactic
background light. Between 20 to 30 per cent of the 850-micron background
resides in sources brighter than 2 mJy. Using an empirical fit to our >2 mJy
data constrained by the EBL at lower fluxes, we argue that the bulk of the
850-micron extragalactic background light resides in sources with fluxes near 1
mJy. The submillimeter sources are plausible progenitors of the present-day
spheroidal population.Comment: 5 pages, accepted by The Astrophysical Journal Letter
Multi-Generational Star Formation in L1551
The L1551 molecular cloud contains two small clusters of Class 0 and I
protostars, as well as a halo of more evolved Class II and III YSOs, indicating
a current and at least one past burst of star formation. We present here new,
sensitive maps of 850 and 450 um dust emission covering most of the L1551
cloud, new CO J=2-1 data of the molecular cloud, and a new, deep, optical image
of [SII] emission. No new Class 0/I YSOs were detected. Compact sub-millimetre
emitters are concentrated in two sub-clusters: IRS5 and L1551NE, and the
HL~Tauri group. Both stellar groups show significant extended emission and
outflow/jet activity. A jet, terminating at HH 265 and with a very weak
associated molecular outflow, may originate from LkHa 358, or from a binary
companion to another member of the HL Tauri group. Several Herbig Haro objects
associated with IRS5/NE were clearly detected in the sub-mm, as were faint
ridges of emission tracing outflow cavity walls. We confirm a large-scale
molecular outflow originating from NE parallel to that from IRS5, and suggest
that the "hollow shell" morphology is more likely due to two interacting
outflows. We confirm the presence of a prestellar core (L1551-MC) of mass 2-3
Mo north-west of IRS5. The next generation cluster may be forming in this core.
The L1551 cloud appears cometary in morphology, and appears to be illuminated
and eroded from the direction of Orion, perhaps explaining the multiple
episodes of star formation in this cloud. The full paper (including figures)
can be downloaded at http://www.jach.hawaii.edu/~gms/l1551/l1551-apj641.pdf, or
viewed at http://www.jach.hawaii.edu/~gms/l1551/.Comment: Accepted for publication in The Astrophysical Journal, April 2006
(vol. 641). 27 pages, 17 figure
New light on the S235A-B star forming region
The S235A-B star forming region has been extensively observed in the past
from the radio to the near-IR, but what was happening in the immediate
surroundings of the water maser, placed in between the two nebulosities, was
still unclear because of insufficient resolution especially in the spectral
range from the Far-IR to the mm, even though there were sound indications that
new young stellar objects (YSOs) are being formed there. We present here new
high resolution maps at mm wavelengths in different molecules (HCO+, C34S,
H2CS, SO2 and CH3CN), as well as in the 1.2 and 3.3 mm continuum obtained with
the Plateau de Bure interferometer, and JCMT observations at 450 micron and 850
micron that unambiguously reveal the presence of new YSOs placed in between the
two HII regions S235A and S235B and associated with the water maser. A
molecular core and an unresolved source in the mm and in the sub-mm are centred
on the maser, with indication of mass infall onto the core. Two molecular
bipolar outflows and a jet originate from the same position. Weak evidence is
found for a molecular rotating disk perpendicular to the direction of the main
bipolar outflow. The derived parameters indicate that one of the YSOs is an
intermediate luminosity object (L~1000 Lsun) in a very early evolutionary
phase, embedded in a molecular core of ~100 Msun, with a temperature of 30 K.
The main source of energy for the YSO could come from gravitational infall,
thus making of this YSO a rare example of intermediate luminosity protostar
representing a link between the earliest evolutionary phases of massive stars
and low mass protostars of class 0-I.Comment: 19 pages, 22 figures, to be published in Astronomy & Astrophysic
Submillimeter detection of the Sunyaev -- Zel'dovich effect toward the most luminous X-ray cluster at z=0.45
We report on the detection of the Sunyaev -- Zel'dovich (SZ) signals toward
the most luminous X-ray cluster RXJ1347-1145 at Nobeyama Radio Observatory (21
and 43 GHz) and at James Clerk Maxwell Telescope (350 GHz). In particular the
latter is the first successful detection of the SZ temperature increment in the
submillimeter band which resolved the profile of a cluster of galaxies. Both
the observed spectral dependence and the radial profile of the SZ signals are
fully consistent with those expected from the X-ray observation of the cluster.
The combined analysis of 21GHz and 350GHz data reproduces the temperature and
core-radius of the cluster determined with the ROSAT and ASCA satellites when
we adopt the slope of the density profile from the X-ray observations.
Therefore our present data provide the strongest and most convincing case for
the detection of the submillimeter SZ signal from the cluster, as well as in
the Rayleigh -- Jeans regime. We also discuss briefly the cosmological
implications of the present results.Comment: 11 pages, The Astrophysical Journal (Letters), in pres
Increased accuracy of ligand sensing by receptor internalization
Many types of cells can sense external ligand concentrations with
cell-surface receptors at extremely high accuracy. Interestingly, ligand-bound
receptors are often internalized, a process also known as receptor-mediated
endocytosis. While internalization is involved in a vast number of important
functions for the life of a cell, it was recently also suggested to increase
the accuracy of sensing ligand as the overcounting of the same ligand molecules
is reduced. Here we show, by extending simple ligand-receptor models to
out-of-equilibrium thermodynamics, that internalization increases the accuracy
with which cells can measure ligand concentrations in the external environment.
Comparison with experimental rates of real receptors demonstrates that our
model has indeed biological significance.Comment: 9 pages, 4 figures, accepted for publication in Physical Review
CHIMPS: the <sup>13</sup>CO/C<sup>18</sup>O (<i>J</i> = 3 → 2) Heterodyne Inner Milky Way Plane Survey
We present the 13CO/C18O (J = 3 → 2) Heterodyne Inner Milky Way Plane Survey (CHIMPS) which has been carried out using the Heterodyne Array Receiver Program on the 15 m James Clerk Maxwell Telescope (JCMT) in Hawaii. The high-resolution spectral survey currently covers |b| ≤ 0.5° and 28° ≲ l ≲ 46°, with an angular resolution of 15 arcsec in 0.5 km s-1 velocity channels. The spectra have a median rms of ˜0.6 K at this resolution, and for optically thin gas at an excitation temperature of 10 K, this sensitivity corresponds to column densities of NH2 ˜ 3 × 1020 cm-2 and NH2 ˜ 4 × 1021 cm-2 for 13CO and C18O, respectively. The molecular gas that CHIMPS traces is at higher column densities and is also more optically thin than in other publicly available CO surveys due to its rarer isotopologues, and thus more representative of the three-dimensional structure of the clouds. The critical density of the J = 3 → 2 transition of CO is ≳104 cm-3 at temperatures of ≤20 K, and so the higher density gas associated with star formation is well traced. These data complement other existing Galactic plane surveys, especially the JCMT Galactic Plane Survey which has similar spatial resolution and column density sensitivity, and the Herschel infrared Galactic Plane Survey. In this paper, we discuss the observations, data reduction and characteristics of the survey, presenting integrated-emission maps for the region covered. Position-velocity diagrams allow comparison with Galactic structure models of the Milky Way, and while we find good agreement with a particular four-arm model, there are some significant deviations
The Canada-UK Deep Submillimeter Survey VI: The 3-Hour Field
We present the complete submillimeter data for the Canada-UK Deep
Submillimeter Survey (CUDSS) 3-hour field. The obeservations were taken with
the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk
Maxwell Telescope on Mauna Kea. The 3-hour field is one of two main fields in
our survey and covers 60 square arcminutes to a 3-sigma depth of 3 mJy. In this
field we have detected 27 sources above 3-sigma and 15 above 3.5-sigma. We
assume the source counts follow the form and
measure = 3.3. This is in good agreement with previous
studies and further supports our claim (Eales et al., 2000) that SCUBA sources
brighter than 3 mJy produce ~20% of the 850m background energy. Using
preliminary ISO 15 m maps and VLA 1.4 GHz data we have identified
counterparts for six objects and have marginal detections at 450m for two
additional sources. With this information we estimate a median redshift for the
sample of 2.00.5, with 10% lying at 1. We have measured the
angular clustering of S850 > 3 mJy sources using the source catalogues from the
CUDSS two main fields, the 3-hour and 14-hour fields, and find a marginal
detection of clustering, primarily from the 14-hour field, of
. This is consistent with clustering at
least as strong as that seen for the Lyman-break galaxy population and the
Extremely Red Objects. Since SCUBA sources are selected over a broader range in
redshifts than these two populations the strength of the true spatial
clustering is expected to be correspondingly stronger.Comment: 17 pages, 8 figures, submitted to Ap
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