17,467 research outputs found
Traces of the (m)other: deconstructing hegemonic historical narrative in Teat(r)o Oficina Uzyna Uzona's Os SertÔes
This article focuses on the way in which renowned SĂŁo Paulo-based theatre company Teat(r)o Oficina Uzyna Uzona deconstructs hegemonic historical narrative in their 2000 - 2007 25 hour-long production of Euclides da Cunhaâs seminal Brazilian novel Os sertĂ”es (âRebellion in the Backlandsâ), an account of the War of Canudos (1896-1897), the first major act of State terrorism carried out by the nascent Brazilian Federal Government on the countryâs subaltern population.
The Teat(r)o Oficinaâs epic adaptation fuses events from the colonial period, the military dictatorship and contemporary 21st Century SĂŁo Paulo to relate the repetitive cycles of misappropriation, oppression and resistance that have characterized the history of Brazil and its people over the centuries. However, any fatalistic view of victimhood as an essential aspect of Brazilian subjectivity is radically challenged by the vibrant, rhythmic, material impact of the theatrical super-signs underpinning the performance text.
Drawing on Julia Kristevaâs notion of the semiotic - the pre-linguistic, illogical, rhythmical materialism of language intimately related to a primordial relationship with the abject mother â I shall suggest that it is the rhythmic, libidinal force of the performance and its extensive use of the cultural manifestations of Brazilâs subaltern population that imbues Os SertĂ”es with the silent presence-as-absence of the abject Brazilian (M)Other â the Black, Indigenous and Mestiza matriarchal line whose alternative discourse is often barred from hegemonic accounts of Brazilian historiography. Her silent heritage is embodied on stage by the members of the Oficina, who reclaim an alienating national heritage for themselves by transforming the often tragic tale of Brazilâs past into a joyous celebration of tenacious vitality
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Computation of the field in an axial gap, trapped-flux type superconducting electric machine
The Bulk Superconductivity Group at the University
of Cambridge is currently investigating the use of high temperature
superconductors in wire and bulk form to increase the
electrical and magnetic loading of an axial gap, trapped flux-type
superconducting electric machine. The use of superconducting
materials in electric machines can lead to increases in efficiency,
as well as power density, which results in reductions in both the
size and weight of the machine. In this paper, the authors present a
method to compute the field in such an electric machine generated
by an array of fully magnetized bulk superconductors. Analytical
expressions are derived for the field that would exist in the coil
region of the motor, which will act as a powerful tool for carrying
out parametric analysis of the motorâs design and performance.This work was supported in part by a Royal Academy of Engineering Research
Fellowship and by the China Scholarship Council.This is the accepted manuscript. The final version is available from IEEE at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6945871
MAGIC-2D simulations of high efficiency hollow beam klystrons
Results from MAGIC-2D simulations of hollow beam, 800 MHz klystrons, with efficiencies on the order of 85% are presented. Such tubes employ the core oscillation method of electron bunching, which allows for most electrons in the beam to be contained within the bunch at the output cavity. By moving towards hollow beam geometries, the bunch at the output cavity presents a favourable phase and spatial profile for energy extraction, and thus, the overall tube efficiency can be maximised
Recent results on GaAs detectors - 137
The present understanding of the charge collection in GaAs detectors with
respect to the materials used and its processing are discussed. The radiation
induced degradation of the charge collection efficiency and the leakage current
of the detectors are summarised. The status of strip and pixel detectors for
the ATLAS experiment are reported along with the latest results from GaAs X-ray
detectors for non-high energy physics applications.Comment: 7 pages. 4 postscript figures + 1 postscript preprint logo + 1 LaTeX
file + 1 style file. Also available at
http://ppewww.ph.gla.ac.uk/preprints/97/05
Indigenous Peoples Boxed in by Brazilâs Political Crisis
Agribusiness has unprecedented leverage over highly unpopular Brazilian president Michel Temer, who is faced with several corruption charges and is struggling for political survival. In a little over one year, the agribusiness lobby and its allies have managed to erode thirty years of human rights and conservation laws. Indigenous peoples and their territorial rights are among the main targets of such policies, and there is no resolution to the situation in sight. With the insight of several scholars, the following forum assesses the consequences of losing the protection the Citizensâ Constitution of 1988 once afforded indigenous peoples in Brazil
Large centric diatoms allocate more cellular nitrogen to photosynthesis to counter slower RUBISCO turnover rates
© 2014 Wu, Jeans, Suggett, Finkel and Campbell. Diatoms contribute ~40% of primary production in the modern ocean and encompass the largest cell size range of any phytoplankton group. Diatom cell size influences their nutrient uptake, photosynthetic light capture, carbon export efficiency, and growth responses to increasing pCO2. We therefore examined nitrogen resource allocations to the key protein complexes mediating photosynthesis across six marine centric diatoms, spanning 5 orders of magnitude in cell volume, under past, current and predicted future pCO2 levels, in balanced growth under nitrogen repletion. Membrane bound photosynthetic protein concentrations declined with cell volume in parallel with cellular concentrations of total protein, total nitrogen and chlorophyll. Larger diatom species, however, allocated a greater fraction (by 3.5-fold) of their total cellular nitrogen to the soluble Ribulose-1,5-bisphosphate Carboxylase Oxygenase (RUBISCO) carbon fixation complex than did smaller species. Carbon assimilation per unit of RUBISCO large subunit (C RbcL-1 s-1) decreased with cell volume, from ~8 to ~2 C RbcL-1 s-1 from the smallest to the largest cells. Whilst a higher allocation of cellular nitrogen to RUBISCO in larger cells increases the burden upon their nitrogen metabolism, the higher RUBISCO allocation buffers their lower achieved RUBISCO turnover rate to enable larger diatoms to maintain carbon assimilation rates per total protein comparable to small diatoms. Individual species responded to increased pCO2, but cell size effects outweigh pCO2 responses across the diatom species size range examined. In large diatoms a higher nitrogen cost for RUBISCO exacerbates the higher nitrogen requirements associated with light absorption, so the metabolic cost to maintain photosynthesis is a cell size-dependent trait
Increased rate of D1 repair in coral symbionts during bleaching is insufficient to counter accelerated photo-inactivation
We dissect the primary photo-inactivation and the counteracting metabolic repair rates in fragments of the scleractinian coral, Pocillopora damicornis, subjected to a combined stress of a shift to elevated temperature (from 26°C to 32°C) and increased light (from 200 Όmol photons m-2 s-1 to 400 Όmol photons m-2 s-1) to induce bleaching. During the bleaching treatment the dinoflagellate symbionts showed a 5.5-fold acceleration in their photosystem II (PSII) repair rate constant, demonstrating that they maintain strong metabolic capacity to clear and replace photo-damaged D1 protein at the elevated temperature and light conditions. Nevertheless, the symbionts concurrently suffered a seven-fold increase in the rate constant for PSII photo-inactivation. This rapid photo-inactivation exceeded the PSII repair capacity, therefore tipping the symbionts, and by implication the symbiosis, into net photo-inhibition. Increased photo-inactivation in hospite, rather than an inhibition of PSII repair, is the principle trigger for net photo-inhibition under bleaching conditions. © 2011, by the American Society of Limnology and Oceanography, Inc
Four-lepton production at hadron colliders: aMC@NLO predictions with theoretical uncertainties
We use aMC@NLO to study the production of four charged leptons at the LHC,
performing parton showers with both HERWIG and Pythia6. Our underlying matrix
element calculation features the full next-to-leading order
result and the contribution of the channel, and it
includes all off-shell, spin-correlation, virtual-photon-exchange, and
interference effects. We present several key distributions together with the
corresponding theoretical uncertainties. These are obtained through a
process-independent technique that allows aMC@NLO to compute scale and PDF
uncertainties in a fully automated way and at no extra CPU-time costComment: 24 pages, 6 figure
Rapid photoprotection in sea-ice diatoms from the East Antarctic pack ice
Photoinhibition and D1 protein re-synthesis were investigated in bottom-dwelling sea-ice microalgal communities from the East Antarctic pack ice during early spring. Bottom-dwelling sea-ice microalgal communities were dominated by diatoms that exhibited rapid photoprotection when exposed to a range of different light levels (10 Όmol photons m-2 s -1, 50 Όmol photons m-2 s-1, 100 Όmol photons m-2 s-1, and 200 Όmol photons m-2 s-1). Photosynthetic capacity of photosystem II (PSII) dropped significantly over 3 h under 200 Όmol photons m-2 s-1, but largely recovered when placed in a low-light environment (10 Όmol photons m-2 s-1) for an additional 3 h. PSII repair rates increased with increasing irradiance, and the D1-protein pool remained steady even under high light (200 Όmol photons m-2 s-1). Sea-ice diatoms showed a low intrinsic susceptibility to photoinactivation of PSII across all the light treatments, and a strong and irradiance-dependent induction of nonphotochemical quenching, which did not depend upon chloroplast protein synthesis, was also seen. These highly plastic organisms, once thought to be adapted to shade, are in fact well equipped to withstand rapid and relatively large changes in light at low temperatures with minimal long-term effect on their photosynthetic machinery. © 2010, by the American Society of Limnology and Oceanography, Inc
Low-energy electron scattering from methanol and ethanol
Measured and calculated differential cross sections for elastic (rotationally unresolved) electron scattering from two primary alcohols, methanol (CH3OH) and ethanol (C2H5OH), are reported. The measurements are obtained using the relative flow method with helium as the standard gas and a thin aperture as the collimating target gas source. The relative flow method is applied without the restriction imposed by the relative flow pressure conditions on helium and the unknown gas. The experimental data were taken at incident electron energies of 1, 2, 5, 10, 15, 20, 30, 50, and 100 eV and for scattering angles of 5°â130°. There are no previous reports of experimental electron scattering differential cross sections for CH3OH and C2H5OH in the literature. The calculated differential cross sections are obtained using two different implementations of the Schwinger multichannel method, one that takes all electrons into account and is adapted for parallel computers, and another that uses pseudopotentials and considers only the valence electrons. Comparison between theory and experiment shows that theory is able to describe low-energy electron scattering from these polyatomic targets quite well
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