20,106 research outputs found
China Since Tiananmen: The Labor Movement
[Excerpt] The twenty years since 1989 have brought two major developments in worker activism. First, whereas workers were part of the mass uprising in the Tiananmen movement, albeit as subordinate partners to the students, labor activism since then has been almost entirely confined to the working class. While the ranks of aggrieved workers have proliferated (expanding from workers in the state-owned sector to include migrant workers) and the forms and incidents of labor activism have multiplied, there is hardly any sign of mobilization that transcends class or regional lines.
Second, we observe that a long-term decline in worker power at the point of production – power that was previously institutionalized in skill hierarchies, union representation, democratic management, permanent or long-term employment, and other conditions of service constitutive of the socialist social contract - is going on even as workers gain more power (at least on paper) outside the workplace. New labor laws have broadened workers\u27 rights and expanded administrative and judicial channels for resolving labor conflicts. These legal and bureaucratic procedures have atomized and depoliticized labor activism even as they have engendered and intensified mobilization outside official limits
The Role of Lambda(1405) in Kaon-Proton Interactions
S-wave scattering into various channels near threshold are analyzed in
heavy-baryon chiral perturbation theory with introduced as an
independent field. This is the approach that predicted the critical density
for negatively charged kaon condensation. We show that
chiral perturbation expansion treating the as elementary is
consistent with {\it all} threshold data including a double-charge-exchange
process suppressed at leading order of chiral expansion in the absence of the
. We also discuss S-wave scattering phase shifts at low
energy.Comment: 12 pages, epsfig.sty, 1 figure (uuencoded
Nuclear Lattice Simulations with EFT
This proceedings article is a summary of results from work done in
collaboration with Bugra Borasoy and Thomas Schaefer. We study nuclear and
neutron matter by combining chiral effective field theory with non-perturbative
lattice methods. We present results for hot neutron matter at temperatures 20
to 40 MeV and densities below twice nuclear matter density.Comment: Talk presented at Lattice2004(non-zero
Light curves from rapidly rotating neutron stars
We calculate light curves produced by a hot spot of a rapidly rotating
neutron star, assuming that the spot is perturbed by a core -mode, which is
destabilized by emitting gravitational waves. To calculate light curves, we
take account of relativistic effects such as the Doppler boost due to the rapid
rotation and light bending assuming the Schwarzschild metric around the neutron
star. We assume that the core -modes penetrate to the surface fluid ocean to
have sufficiently large amplitudes to disturb the spot. For a core
-mode, the oscillation frequency defined
in the co-rotating frame of the star will be detected by a distant observer,
where and are respectively the spherical harmonic degree and the
azimuthal wave number of the mode, and is the spin frequency of the
star. In a linear theory of oscillation, using a parameter we parametrize
the mode amplitudes such that at the surface, where
and are the and components of the
displacement vector of the mode and is the radius of the star. For the
-mode with , we find that the fractional Fourier
amplitudes at in light curves depend on the angular distance
of the spot centre measured from the rotation axis and become
comparable to or even larger than for small values of .Comment: 10 pages, 9 figures, submitted to M
Automated interpretation of benthic stereo imagery
Autonomous benthic imaging, reduces human risk and increases the amount of collected data. However, manually interpreting these high volumes of data is onerous, time consuming and in many cases, infeasible. The objective of this thesis is to improve the scientific utility of the large image datasets. Fine-scale terrain complexity is typically quantified by rugosity and measured by divers using chains and tape measures. This thesis proposes a new technique for measuring terrain complexity from 3D stereo image reconstructions, which is non-contact and can be calculated at multiple scales over large spatial extents. Using robots, terrain complexity can be measured without endangering humans, beyond scuba depths. Results show that this approach is more robust, flexible and easily repeatable than traditional methods. These proposed terrain complexity features are combined with visual colour and texture descriptors and applied to classifying imagery. New multi-dataset feature selection methods are proposed for performing feature selection across multiple datasets, and are shown to improve the overall classification performance. The results show that the most informative predictors of benthic habitat types are the new terrain complexity measurements. This thesis presents a method that aims to reduce human labelling effort, while maximising classification performance by combining pre-clustering with active learning. The results support that utilising the structure of the unlabelled data in conjunction with uncertainty sampling can significantly reduce the number of labels required for a given level of accuracy. Typically 0.00001–0.00007% of image data is annotated and processed for science purposes (20–50 points in 1–2% of the images). This thesis proposes a framework that uses existing human-annotated point labels to train a superpixel-based automated classification system, which can extrapolate the classified results to every pixel across all the images of an entire survey
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