4,541 research outputs found
Skills Obsolescence: Causes and Cures
Until now there has been surprisingly little research on the causes of and the remedies for skills obsolescence. This study tries to fill that gap to some extent by analysing the relation between risk factors and skills obsolescence. Moreover, the role remedies play to counter skills obsolescence is analysed. Four empirical analyses that relate skills obsolescence to risk factors and remedies are presented. We find that most risk factors identified in the literature can be validated empirically. The remedies for skills obsolescence are not effective in all situations: the results show that there is considerable variation in the effectiveness of the remedies across different types of skills obsolescence. Although current available data does not allow a comprehensive analysis, which also takes account of relations between the various types of skills obsolescence, the results obtained are plausible and offer a starting point for further research.education, training and the labour market;
Strong coupling of magnons in a YIG sphere to photons in a planar superconducting resonator in the quantum limit
We report measurements of a superconducting coplanar waveguide resonator
(CPWR) coupled to a sphere of yttrium-iron garnet. The non-uniform CPWR field
allows us to excite various magnon modes in the sphere. Mode frequencies and
relative coupling strengths are consistent with theory. Strong coupling is
observed to several modes even with, on average, less than one excitation
present in the CPWR. The time response to square pulses shows oscillations at
the mode splitting frequency. These results indicate the feasibility of
combining magnonic and planar superconducting quantum devices.Comment: 5 pages, 4 figure
Generation of density inhomogeneities by magnetohydrodynamic waves in two dimensions
Using two dimensional simulations, we study the formation of structures with
a high-density contrast by magnetohydrodynamic waves in regions in which the
ratio of thermal to magnetic pressure is small. The initial state is a uniform
background perturbed by fast-mode wave. Our most significant result is that
dense structures persist for far longer in a two-dimensional simulation than in
the one-dimensional case. Once formed, these structures persist as long as the
fast-mode amplitude remains high.Comment: 6 pages, 7 figures, accepted by MNRA
Preparation of Subradiant States using Local Qubit Control in Circuit QED
Transitions between quantum states by photon absorption or emission are
intimately related to symmetries of the system which lead to selection rules
and the formation of dark states. In a circuit quantum electrodynamics setup,
in which two resonant superconducting qubits are coupled through an on-chip
cavity and driven via the common cavity field, one single-excitation state
remains dark. Here, we demonstrate that this dark state can be excited using
local phase control of individual qubit drives to change the symmetry of the
driving field. We observe that the dark state decay via spontaneous emission
into the cavity is suppressed, a characteristic signature of subradiance. This
local control technique could be used to prepare and study highly correlated
quantum states of cavity-coupled qubits.Comment: 5 pages, 4 figure
Shock-triggered formation of magnetically-dominated clouds
To understand the formation of a magnetically dominated molecular cloud out
of an atomic cloud, we follow the dynamical evolution of the cloud with a
time-dependent axisymmetric magnetohydrodynamic code. A thermally stable warm
atomic cloud is initially in static equilibrium with the surrounding hot
ionised gas. A shock propagating through the hot medium interacts with the
cloud. As a fast-mode shock propagates through the cloud, the gas behind it
becomes thermally unstable. The value of the gas also becomes much
smaller than the initial value of order unity. These conditions are ideal for
magnetohydrodynamic waves to produce high-density clumps embedded in a rarefied
warm medium. A slow-mode shock follows the fast-mode shock. Behind this shock a
dense shell forms, which subsequently fragments. This is a primary region for
the formation of massive stars. Our simulations show that only weak and
moderate-strength shocks can form cold clouds which have properties typical of
giant molecular clouds.Comment: 7 pages, 6 figures, accepted by Astronomy and Astrophysic
Technisch werkdocument HBO-Monitor 1994: de arbeidsmarktpositie van afgestudeerden van het hoger beroepsonderwijs uit het studiejaar 1992-1993
Dit technisch werkdocument bevat een technische toelichting op de uitvoering van het HBO- Monitor onderzoek voor zover deze informatie niet in de overige HBO-Monitor publicaties over het uitvoeringsjaar 1994 is opgenomen. Het werkdocument gaat in concreto in op de dataverzameling (hoofdstuk 2), het herwegen van de resultaten naar het landelijk totaal aan afgestudeerden uit het studiejaar 1992/1993 (hoofdstuk 3), en de uitkomsten van de multivariate analyses die zijn uitgevoerd om te bepalen welke factoren de arbeidsmarktposi tie van de hbo''ers beïnvloeden.labour market entry and occupational careers;
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