Preparation of silver-activated zinc sulfide thin films

Silver improves luminescence and reduces contamination of zinc sulfide phosphors. The silver is added after the zinc sulfide phosphors are deposited in thin films by vapor evaporation, but before calcining, by immersion in a solution of silver salt

Spin current propagation through ultra-thin insulating layers in multilayered ferromagnetic systems

Spin current pumping from a ferromagnet through an insulating layer into a heavy metal was studied in a CoFeB/SiO2/Pt system in relation to the thickness and interfacial structure of the insulating layer. The propagation of spin current from the ferromagnet into the heavy metal falls rapidly with sub-nanometer thicknesses of SiO2 and is suppressed beyond a nominal thickness of 2 nm. Structural analysis shows that SiO2 only forms a complete barrier layer beyond around 2 nm, indicating that the presence of a discontinuous insulating barrier, and not tunneling or diffusion, explains the main observations of spin-pumping with thin insulating layers

Proximity-induced magnetism in Pt layered with rare-earth–transition-metal ferrimagnetic alloys

The proximity-induced moment (PIM) in heavy metal layers may play a significant role in heterostructured spintronic systems. In particular, the PIM of a heavy metal adjacent to a magnetic layer has been linked to interfacial spin transport behavior. Element-resolved x-ray magnetic measurements were used to investigate PIM in Pt layered with two different rare-earth (RE):3d transition-metal (TM) ferrimagnetic alloys in which the net moment was dominated by either the RE or the TM at room temperature. We observed significant PIM in Pt confined to a 2-nm interfacial region for Pt/Co77Gd23 and Pt/(Fe50Co50)77Gd23 and, in both cases, the PIM was parallel to the TM sublattice rather than the RE or the net moment. Our results highlight the prominence of the d−d mediated interactions between the Pt and the constituents of the ferrimagnetic RE:TM alloys over the net macroscopic moment

Participation in community arts: lessons from the inner-city

In this paper, we critically reflect, through the lens of liberation psychology, on our experiences of using participative community arts in work with young people and intergenerational groups in inner-city Manchester, UK. We used mixed methods to examine the impact of and engagement with community arts in two projects. One study was quasi experimental in design and used questionnaires developed by the researchers to compare Higher Education aspirations with levels of self-esteem and self-efficacy, as a result of participating in creative music sessions. The other study was a multi-media action research project, using qualitative methods to explore participant experience and the impact of the activities. Our methods included observations, interviews, the creative products and the creative processes. Through our critical reflections, we examine the role of power and powerlessness in participative arts, as well as ways in which participation had the potential to enable ‘conscientisation', which in turn had the potential to lead to self-empowerment and motivation for action. Both projects demonstrated the importance of forming ‘communities of practice’ with a diverse range of stakeholders in order to gain maximum impact from the projects and move towards a position of collaborative governance. We found that this approach was a useful starting point for facilitating ‘collaborative governance’ for wider social and political change

Impact of efavirenz pharmacokinetics and pharmacogenomics on neuropsychological performance in older HIV-infected patients

Pharmacokinetics (PK) and pharmacodynamics of efavirenz and its 8-hydroxy metabolite (8-OH-efavirenz) have not been robustly evaluated in older HIV-infected persons

Magnetic damping in ferromagnetic/heavy-metal systems: The role of interfaces and the relation to proximity-induced magnetism

Damping and spin transport in spintronic multilayered systems continues to be a topic of active research. The enhancement of damping in ferromagnet (FM)/spacer layer (SL)/heavy-metal (HM) thin-film systems was studied for Co 25 Fe 75 / SL / Pt with a nonmagnetic (NM) SL of either Au or Cu with variable thickness, in order to understand the correlation with proximity-induced magnetism (PIM) in the HM. Structural, PIM and magnetic damping measurements were undertaken on the same samples. Specifically, secondary ion mass spectroscopy, element specific x-ray magnetic reflectivity and x-ray magnetic circular dichroism at the Pt and Au L 3 edges, and ferromagnetic resonance methods were used. With increasing thickness of a Cu or Au SL directly between the FM and the Pt layer, the Pt PIM and the damping both fall rapidly, with a relationship between damping and PIM that depends on the SL material. The PIM observed in the Au layer showed a complex dependence on the layer thickness, suggesting some hybridization with the Pt. The role of the number and location of interfaces on the damping was demonstrated with the addition of a SL within the Pt layer, which showed that the specific details of the NM/HM interface also affects the damping. The insertion of a Cu SL within the Pt showed a measurable increase in the overall enhancement of the damping while the insertion of a Au SL into Pt had almost no effect on the damping. Together these results demonstrate the role of both PIM and of additional interfaces in the enhancement of damping in FM/HM systems, which is not fully accounted for by existing theory

'I'm not a therapist you know...I'm an artist': Facilitating well-being and basic psychological needs satisfaction through community arts participation

The role of the artist is crucial to the success of arts for health initiatives yet remains under-explored in the research literature. This article examines the practice of arts facilitation through the lens of self-determination theory (SDT). Fourteen interviews with artists leading projects for older adults across three settings were subject to a secondary thematic analysis. A hybrid approach was adopted with themes developed inductively and deductively. Artists were found to satisfy participants’ basic psychological needs in diverse ways. Autonomy: artists spoke of valuing the expression of individual differences and identities, encouraging participants to assume ownership of projects. Competence: developing participants’ aptitudes and skills and repairing negative self-beliefs emerged as common goals. Relatedness: artists sought to cultivate social interaction within groups and forge relationships with participants themselves. Self-determination theory provides a well-validated framework to conceptualize the psycho-social processes mediating arts project outcomes relating to psychological well-being

Proximity-induced magnetism in Pt layered with rare-earth–transition-metal ferrimagnetic alloys

The proximity-induced moment (PIM) in heavy metal layers may play a significant role in heterostructured spintronic systems. In particular, the PIM of a heavy metal adjacent to a magnetic layer has been linked to interfacial spin transport behavior. Element-resolved x-ray magnetic measurements were used to investigate PIM in Pt layered with two different rare-earth (RE): 3d transition-metal (TM) ferrimagnetic alloys in which the net moment was dominated by either the RE or the TM at room temperature. We observed significant PIM in Pt confined to a 2-nm interfacial region for Pt/Co77 Gd23 and Pt/(Fe50Co50)77 Gd23 and, in both cases, the PIM was parallel to the TM sublattice rather than the RE or the net moment. Our results highlight the prominence of the d−d mediated interactions between the Pt and the constituents of the ferrimagnetic RE:TM alloys over the net macroscopic moment

Switching the stereochemical outcome of 6-endo-trig cyclizations; Synthesis of 2,6-Cis-6-substituted 4-oxopipecolic acids

A base-mediated 6-endo-trig cyclization of readily accessible enone-derived α-amino acids has been developed for the direct synthesis of novel 2,6-cis-6- substituted-4-oxo-L-pipecolic acids. A range of aliphatic and aryl side chains were tolerated by this mild procedure to give the target compounds in good overall yields. Molecular modeling of the 6-endo-trig cyclization allowed some insight as to how these compounds were formed, with the enolate intermediate generated via an equilibrium process, followed by irreversible tautomerization/neutralization providing the driving force for product formation. Stereoselective reduction and deprotection of the resulting 2,6-cis-6-substituted 4-oxo-L-pipecolic acids to the corresponding 4-hydroxy-L-pipecolic acids was also performed

Simulation of long-acting administration of antituberculosis agents using pharmacokinetic modelling

Design and qualify a PBPK model for existing oral anti-TB agents. Predict pharmacokinetics of long-acting nanoformulations of anti-TB agents in adults