1,729,458 research outputs found
Special issue: ISSRE 2018, the 29th IEEE International Symposium on Software Reliability Engineering
No full textOvereducation and overskilling in the early careers of PhD graduates: Does international migration reduce labour market mismatch?
No full textThis paper examines the effect of international mobility on the education-job mismatch and skill-mismatch of PhD graduates after controlling for self-selection into cross-border mobility. Using individual-level data from two waves of surveys of PhD recipients in Italy conducted by the Italian National Institute of Statistics, we find that migration to foreign countries reduces significantly the risk of overeducation and overskilling. These results remain robust to different empirical methodologies and subsamples
Fiscal policies and the terms of trade in an endogenous growth model with overlapping generations
No full textThis paper investigates how changes in fiscal policy can affect relative prices, optimal savings and steady state utility in a two-country, overlapping generations model of endogenous growth. We develop a simple model that combines Blanchard-type consumers with uncertain lifetimes, with an endogenous growth model … la Romer in which there are production externalities from the capital stock of other firms. The basic insight is to highlight, within an optimising framework, a potentially interesting link between fiscal policy and the terms of trade. A permanent rise in one country's share of government consumption to GDP results in an improvement in its terms of trade, a fall in its share of private consumption to GDP and a lower growth rate. A steady state rise in the public debt to GDP ratio results in an increase in the share of consumption to GDP, a higher demand for the foreign good and a lower growth rate. The effect upon the terms of trade is, however, ambiguous
Eigenanalysis and continuum modelling of a curved repetitive beam-like structure
Full text linkA curved repetitive pin-jointed structure is analysed using a state variable transfer matrix technique. Within a global Cartesian coordinate system, the transfer matrix G of each cell is different, but within a polar coordinate system they are identical, implying circumferential symmetry. Eigenanalysis provides the rates of decay of self-equilibrated end loading, as anticipated by Saint-Venant's principle, two real unity eigenvalues associated with rigid body rotation and pure bending, and repeated conjugate complex unity eigenvalues, associated with the rigid body displacements, and tension and shear. Interpretation of the eigen- and principal vectors, and also combined vectors from different eigenspaces, allows one to determine the equivalent continuum beam properties, e.g. second moment of area, location of the neutral axis, cross-sectional area, and shear coefficient. The transfer matrix approach is validated by comparison with what may be regarded as exact finite element predictions, and also compared with a (believed novel) thick curved beam strain energy analysis employing the derived equivalent continuum properties and the use of Castigliano's theorems. Agreement is found to be excellent
Quantum mechanics in de Sitter space
No full textWe consider some possible phenomenological implications of the extended uncertainty principle, which is believed to hold for quantum mechanics in de Sitter spacetime. The relative size of the corrections to the standard results is however of the order of the ratio between the length scale of the quantum mechanical system and the de Sitter radius, and therefore exceedingly small. Nevertheless, the existence of effects due to the large scale curvature of spacetime in atomic experiments has a theoretical relevance
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