Quasiparticle transport in the vortex state of YBa_2Cu_3O_6.9

The effect of vortices on quasiparticle transport in cuprate superconductors was investigated by measuring the low temperature thermal conductivity of YBa_2Cu_3O_6.9 in magnetic fields up to 8 T. The residual linear term (as T \to 0) is found to increase with field, directly reflecting the occupation of extended quasiparticle states. A study for different Zn impurity concentrations reveals a good agreement with recent calculations for a d-wave superconductor, thereby shedding light on the nature of scattering by both impurities and vortices. It also provides a quantitative measure of the gap near the nodes.Comment: 4 pages, 2 included eps figures, significant new analysis wrt other experiments, to appear in Phys Rev Lett 29 March 199

Electrocatalytic properties of surface oxides on gold, platinum, and stainless steel electrodes in electrooxidation of malic acid

Electrocatalytic properties of oxides formed at gold, platinum, and stainless steel electrodes in the malic acid electrooxidation in 0.1 M Na 2 SO 4 are studied. Gas chromatographic analysis of the electrolyte after holding the potential at 1.0 V for 8 h shows that on platinum and gold electrodes 2 mmol of acetaldehyde are produced and on stainless steel, 45 mmol. The acetaldehyde yield is the highest on stainless steel

Ethics of dust: visual essay on the artistic works by Jorge Otero-Pailos

The works of artist and preservation architect Jorge Otero-Pailos on experimental preservation provoke deep reflections about some of the fundamental questions dealing with heritage: temporality of objects, changeability of inscribed cultural values, the greater purpose of architectural preservation as a cultural practice, and the societal role of an architect and preservationist in formulating narratives around heritage. As the artistic installations featured in this visual essay — The Ethics of Dust (2014–2016) and Watershed Moment (2020) — demonstrate, Jorge Otero-Pailos combines various elusive elements, such as water sounds and dust, to conceive meditative and contemplative spaces. His installations invite visitors to pause and reflect on the memories, both personal, social, and environmental, that define each of us; they probe deep into the past and deep into the future. Since these are some of the issues we wanted to explore in this special issue, ‘Embodiment and Meaning-making: Interdisciplinary Perspectives on Heritage Architecture’, we invited various artists and scholars to write a very short caption in reaction to the images provided by the author through one of these three ‘lenses’: - affect, embodied experience, atmosphere; - politics of heritage; - processes of meaning-making. The results reveal the power of images to provoke imagination through atmospheric and embodied experiences, and the power of experimental heritage work to convey (political) meaning across distance and different analogue or digital media. This visual essay includes contributions from (in order of appearance): Tenna Doktor Olsen Tvedebrink, Federico De Matteis, Michael Hirschbichler, Jovana Popić, Maria De Piedade Ferreira, Uta Pottgiesser, Marcus Weisen and Brady Wagoner, with an epilogue from Jorge Otero-Pailos