764 research outputs found
What future for Chinese labour and transnational solidarity?
In this conclusion we argue that class struggle is central to the future of Chinese workers and the improvement of their situation. Technological upgrading in itself will not automatically result in better working conditions. Moreover, we point out that Chinese workers have a number of old and new sources of power to draw on. What is, however, most problematic in this respect is the role of the ACFTU, operating as an official mediator rather than an independent trade union, and the resulting lack of associational power. Hence, informal labour NGOs have an important role to play in supporting social justice for China’s workers
A protosolar nebula origin for the ices agglomerated by Comet 67P/Churyumov-Gerasimenko
The nature of the icy material accreted by comets during their formation in
the outer regions of the protosolar nebula is a major open question in
planetary science. Some scenarios of comet formation predict that these bodies
agglomerated from crystalline ices condensed in the protosolar nebula.
Concurrently, alternative scenarios suggest that comets accreted amorphous ice
originating from the interstellar cloud or from the very distant regions of the
protosolar nebula. On the basis of existing laboratory and modeling data, we
find that the N/CO and Ar/CO ratios measured in the coma of the Jupiter
family comet 67P/Churyumov-Gerasimenko by the ROSINA instrument aboard the
European Space Agency's Rosetta spacecraft match those predicted for gases
trapped in clathrates. If these measurements are representative of the bulk
N/CO and Ar/CO ratios in 67P/Churyumov-Gerasimenko, it implies that the
ices accreted by the comet formed in the nebula and do not originate from the
interstellar medium, supporting the idea that the building blocks of outer
solar system bodies have been formed from clathrates and possibly from pure
crystalline ices. Moreover, because 67P/Churyumov-Gerasimenko is impoverished
in Ar and N, the volatile enrichments observed in Jupiter's atmosphere
cannot be explained solely via the accretion of building blocks with similar
compositions and require an additional delivery source. A potential source may
be the accretion of gas from the nebula that has been progressively enriched in
heavy elements due to photoevaporation.Comment: The Astrophysical Journal Letters, in pres
Chinese labour in the global economy: an introduction
This Introduction outlines the main purpose of this special issue volume: to analyse new forms of resistance by Chinese workers against conditions of super-exploitation. After an assessment of the new international division of labour, we provide an overview of Chinese production in the global economy, followed by an introduction of the contributions to this volume
Origin of molecular oxygen in Comet 67P/Churyumov-Gerasimenko
Molecular oxygen has been detected in the coma of comet
67P/Churyumov-Gerasimenko with abundances in the 1-10% range by the ROSINA-DFMS
instrument on board the Rosetta spacecraft. Here we find that the radiolysis of
icy grains in low-density environments such as the presolar cloud may induce
the production of large amounts of molecular oxygen. We also show that
molecular oxygen can be efficiently trapped in clathrates formed in the
protosolar nebula, and that its incorporation as crystalline ice is highly
implausible because this would imply much larger abundances of Ar and N2 than
those observed in the coma. Assuming that radiolysis has been the only O2
production mechanism at work, we conclude that the formation of comet
67P/Churyumov-Gerasimenko is possible in a dense and early protosolar nebula in
the framework of two extreme scenarios: (1) agglomeration from pristine
amorphous icy grains/particles formed in ISM and (2) agglomeration from
clathrates that formed during the disk's cooling. The former scenario is found
consistent with the strong correlation between O2 and H2O observed in 67P/C-G's
coma while the latter scenario requires that clathrates formed from ISM icy
grains that crystallized when entering the protosolar nebula.Comment: The Astrophysical Journal Letters, in pres
Limits on axion and light Higgs boson production in Y(1S) decays
We have searched for axion and light Higgs boson production in the channel Y(1S) → (a0 or h0)+gamma, where the non-interacting axion a0 and the Higgs boson h0 do not decay in the detector. We find no evidence for an axion and give an upper limit, Br(Y(1S) -> a0 gamma) <4.0x10(-5) (90% CL), for long-lived axions. Combining our limit with the previous search in J/Psi decays, we are able to rule out the axion in the standard model with first order QCD corrections. Our Y(1S) data also rule out a Higgs boson with mass m<86 MeV
Presidential History
News release announces the Presidential History of the University of Dayton
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