Proximity-induced density-of-states oscillations in a superconductor/strong-ferromagnet system

We have measured the evolution of the tunneling density of states (DOS) in superconductor/ferromagnet (S/F) bilayers with increasing F-layer thickness, where F in our experiment is the strong ferromagnet Ni. As a function of increasing Ni thickness, we detect multiple oscillations in the DOS at the Fermi energy from differential conductance measurements. The features in the DOS associated with the proximity effect change from normal to inverted twice as the Ni thickness increases from 1 to 5 nm.Comment: 4 pages, 4 figure

The diatoms collected by the U.S.S. Cacopan in the Antarctic in 1947

For investigation of the Diatomaceae, a series of water samples was collected from the U. S. S. CACOPAN by filling a citrate bottle either with surface water obtained with a bucket or with water obtained from various depths with Nansen bottles…

‘Never drop without your significant other, cause that way lies ruin’: the boundary work of couples who use MDMA together

MDMA has a variety of pro-social effects, such as increased friendliness and heightened empathy, yet there is a distinct lack of research examining how these effects might intertwine with a romantic relationship. This article seeks to compensate for this absence and explore heterosexual couples’ use of MDMA through the lens of the boundaries they construct around these experiences. Three couple interviews, two diary interviews and eight written diaries about couples’ MDMA practices were analysed. Douglas’ (2001) and Stenner’s (2013) work around order, disorder and what lies at the threshold between the two are employed here. This conceptual approach allows us to see what happens at the border of MDMA experiences as crucial to their constitution. Two main themes are identified in the data. First, MDMA use was boundaried from daily life both temporally and corporeally: the drug was tied to particular times in people’s lives as well as the performance of rituals which engaged the material world and reenchanted everyday spaces and selves. Secondly, other people are excluded from MDMA experiences to varying degrees in order to preserve the emotionally intense space for the couple alone. This paper claims that MDMA use forms part of a spectrum of relationship ‘work’ practices; a unique kind of ‘date night’ that revitalises couples’ connection. Hence, MDMA should be recognised as transforming couple as well as individual practices. Finally, it is suggested that harm reduction initiatives could distinguish more ‘messy’ forms of emotional harm and engage with users’ language of ‘specialness’ to limit negative impacts of MDMA use

Gauge Theoretic Invariants of, Dehn Surgeries on Knots

New methods for computing a variety of gauge theoretic invariants for homology 3-spheres are developed. These invariants include the Chern-Simons invariants, the spectral flow of the odd signature operator, and the rho invariants of irreducible SU(2) representations. These quantities are calculated for flat SU(2) connections on homology 3-spheres obtained by 1/k Dehn surgery on (2,q) torus knots. The methods are then applied to compute the SU(3) gauge theoretic Casson invariant (introduced in [H U Boden and C M Herald, The SU(3) Casson invariant for integral homology 3--spheres, J. Diff. Geom. 50 (1998) 147-206]) for Dehn surgeries on (2,q) torus knots for q=3,5,7 and 9.Comment: Version 3: minor corrections from version 2. Published by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol5/paper6.abs.htm

Strategies for successful field deployment in a resource-poor region: Arsenic remediation technology for drinking water

Strong long-term international partnership in science, technology, finance and policy is critical for sustainable field experiments leading to successful commercial deployment of novel technology at community-scale. Although technologies already exist that can remediate arsenic in groundwater, most are too expensive or too complicated to operate on a sustained basis in resource-poor communities with the low technical skill common in rural South Asia. To address this specific problem, researchers at University of California-Berkeley (UCB) and Lawrence Berkeley National Laboratory (LBNL) invented a technology in 2006 called electrochemical arsenic remediation (ECAR). Since 2010, researchers at UCB and LBNL have collaborated with Global Change Program of Jadavpur University (GCP-JU) in West Bengal, India for its social embedding alongside a local private industry group, and with financial support from the Indo-US Technology Forum (IUSSTF) over 2012–2017. During the first 10 months of pilot plant operation (April 2016 to January 2017) a total of 540 m3 (540,000 L) of arsenic-safe water was produced, consistently and reliably reducing arsenic concentrations from initial 252 ± 29 to final 2.9 ± 1 parts per billion (ppb). This paper presents the critical strategies in taking a technology from a lab in the USA to the field in India for commercialization to address the technical, socio-economic, and political aspects of the arsenic public health crisis while targeting several sustainable development goals (SDGs). The lessons learned highlight the significance of designing a technology contextually, bridging the knowledge divide, supporting local livelihoods, and complying with local regulations within a defined Critical Effort Zone period with financial support from an insightful funding source focused on maturing inventions and turning them into novel technologies for commercial scale-up. Along the way, building trust with the community through repetitive direct interactions, and communication by the scientists, proved vital for bridging the technology-society gap at a critical stage of technology deployment. The information presented here fills a knowledge gap regarding successful case studies in which the arsenic remediation technology obtains social acceptance and sustains technical performance over time, while operating with financial viability

Microbiology survey shows authors have most to gain from peer review

In the week that an international team of publishers, science communicators and other scholarly organisations launch the second international Peer Review Week, the preliminary findings from our new survey reveal that authors gain more from peer review than the people who do the actual review

Is there equivalence between PCI and CABG surgery in long-term survival of patients with diabetes? Importance of interpretation biases and biological plausibility.

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Creativity and Autonomy in Swarm Intelligence Systems

This work introduces two swarm intelligence algorithms -- one mimicking the behaviour of one species of ants (\emph{Leptothorax acervorum}) foraging (a `Stochastic Diffusion Search', SDS) and the other algorithm mimicking the behaviour of birds flocking (a `Particle Swarm Optimiser', PSO) -- and outlines a novel integration strategy exploiting the local search properties of the PSO with global SDS behaviour. The resulting hybrid algorithm is used to sketch novel drawings of an input image, exploliting an artistic tension between the local behaviour of the `birds flocking' - as they seek to follow the input sketch - and the global behaviour of the `ants foraging' - as they seek to encourage the flock to explore novel regions of the canvas. The paper concludes by exploring the putative `creativity' of this hybrid swarm system in the philosophical light of the `rhizome' and Deleuze's well known `Orchid and Wasp' metaphor