12,799 research outputs found
Exploring Complex Phases of the MSSM at Future Colliders
Once Supersymmetry is discovered, exploring the phases of supersymmetric
parameters will be one of the most important tasks of future colliders. We
analyze the possibilities of investigating the phases of the cMSSM via their
effects on the Higgs sector through radiative corrections. Within two benchmark
scenarios we compare the capabilities of the LHC, the ILC and a future gamma
gamma collider.Comment: 6 pages, 10 figures. Talk given by S. Heinemeyer at the 2005
International Linear Collider Workshop, Stanford Ca (LCWS05
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Crossing disciplinary lines: reconciling social and genomic perspectives on the histories and legacies of the transatlantic trade in enslaved Africans
Over the past two decades, advances in the field of genomics have presented new opportunities to shed light upon the origins of enslaved Africans and their contemporary descendants. While this possibility has caused enthusiasm among members of the public, it has provoked contention within the academic sphere. This paper represents an attempt to reconcile these opposing disciplinary divisions, by examining, explaining, and discussing the processes involved in the production of genetic “ancestry” estimates, in order to moderate the aura of absolute “truth” that is often associated with such techniques. Our discussion focuses on two case studies – the academic use of ancient DNA analyses to estimate the geographic origins of historically enslaved individuals, and the commercialization of DNA “ancestry” testing techniques aimed at African-American roots-seekers – and draws upon recent ethnographic data relating to the experiences of test creators and test-takers, in order to contribute to this debate.This work was supported by the EUROTAST project, a Marie Curie Actions Initial Training Network, funded by the European Union under the Seventh Framework Programme [grant number EUROTAST FP7-PEOPLE-2010]
Functional properties of ceramic-Ag nanocomposite coatings produced by magnetron sputtering
In recent years, the use of nanocomposite materials to functionalize surfaces has been
investigated, taking advantage of the complementary properties of the nanocomposite
constituents. Among this family of materials, ceramic-Ag coatings have been widely studied
due to the large variety of functionalities that silver possesses and the possibility of
tuning the coating’s practical features by selecting the proper matrix to support this noble
metal. Therefore, this review focuses on the effects of silver nanoparticles on the functional
properties of ceramic-Ag nanocomposites. The chemistry, structure, morphology and
topography of the coatings are analyzed with respect to the changes produced by the silver
nanoparticles’ distribution, amount and sizes and by altering production process variables.
To offer a clear understanding of the functionalities of these materials, the optical, electrical,
mechanical, tribological, electrochemical and biological properties reported in the last
decade are reviewed, focusing on the ability to tune such properties by modifying the silver
distribution, morphology and composition. In particular, the surface plasmon resonance,
self-lubricating ability and antibacterial effect of silver are covered in detail, establishing
their correlation with factors such as silver diffusion, segregation and ionization.This research is partially sponsored by FEDER funds through the program COMPETE-Programa Operacional Factores de Competitividade and by Portuguese national funds through FCT-Fundação para a Ciência e a Tecnologia, under the projects ANTIMICROBCOAT - PTDC/CTM/102853/2008 and in the framework of the Strategic Projects PEST-C/FIS/UI607/2011, PEST-C/EME/UI0285/2011 and SFRH/BD/80947/2011. The authors would like to thank the ‘‘Surface Modification and Functionalization
- Research Group (SMF)” for advice during the development of this review
- …