The development of iHARP: a multiple instruction issue processor chip

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.---- Copyright IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.During the last decade RISC ideas on processor architecture have become widely accepted. RISC architectures achieve significant performance advantages over CISC architectures by striving to execute one instruction per cycle. However, a traditional RISC architemre can never execute more than one instruction per cycle. Achieving further performance improvements beyond RISC depends on developing processors which fetch and execute more than one operation in each processor cycle.Final Accepted Versio

Flat Bunches with a Hollow Distribution for Space Charge Mitigation

Longitudinally hollow bunches provide one means to mitigate the impact of transverse space charge. The hollow distributions are created via dipolar parametric excitation during acceleration in CERN's Proton Synchrotron Booster. We present simulation work and beam measurements. Particular emphasis is given to the alleviation of space charge effects on the long injection plateau of the downstream Proton Synchrotron machine, which is the main goal of this study.Comment: Proceedings of International Particle Accelerator Conference 201

Priming in the Microbial Landscape: Periphytic Algal Stimulation of Litter-Associated Microbial Decomposers

Microbial communities associated with submerged detritus in aquatic ecosystems often comprise a diverse mixture of autotrophic and heterotrophic microbes, including algae, bacteria, protozoa, and fungi. Recent studies have documented increased rates of plant litter mass loss when periphytic algae are present. We conducted laboratory and field experiments to assess potential metabolic interactions between natural autotrophic and heterotrophic microbial communities inhabiting submerged decaying plant litter of Typha angustifolia and Schoenoplectus acutus. In the field, submerged plant litter was either exposed to natural sunlight or placed under experimental canopies that manipulated light availability and growth of periphytic algae. Litter was collected and returned to the laboratory, where algal photosynthesis was manipulated (light/dark incubation), while rates of bacterial and fungal growth and productivity were simultaneously quantified. Bacteria and fungi were rapidly stimulated by exposure to light, thus establishing the potential for algal priming of microbial heterotrophic decay activities. Experimental incubations of decaying litter with 14C‐ and 13C‐bicarbonate established that inorganic C fixed by algal photosynthesis was rapidly transferred to and assimilated by heterotrophic microbial decomposers. Periphytic algal stimulation of microbial heterotrophs, especially fungal decomposers, is an important and largely unrecognized interaction within the detrital microbial landscape, which may transform our current conceptual understanding of microbial secondary production and organic matter decomposition in aquatic ecosystems

Algal-Mediated Priming Effects on the Ecological Stoichiometry of Leaf Litter Decomposition: A Meta-Analysis

In aquatic settings, periphytic algae exude labile carbon (C) that can significantly suppress or stimulate heterotrophic decomposition of recalcitrant C via priming effects. The magnitude and direction of priming effects may depend on the availability and stoichiometry of nutrients like nitrogen (N) and phosphorus (P), which can constrain algal and heterotrophic activity; in turn, priming may affect heterotrophic acquisition not only of recalcitrant C, but also N and P. In this study, we conducted a meta-analysis of algal-mediated priming across leaf litter decomposition experiments to investigate (1) bottom-up controls on priming intensity by dissolved N and P concentrations, and (2) effects of algal-mediated priming on the fate of litter-periphyton N and P during decomposition. Across a total of nine datasets, we quantified priming intensity and tested algal effects on litter-periphyton C:N, C:P, and N- and P-specific mass loss rates. Algal effect sizes did not significantly differ from zero, indicating weak or inconsistent algal effects on litter-periphyton stoichiometry and nutrient loss. These findings were likely due to wide variation in algal priming intensity across a limited number of experiments, ranging from strongly negative (410% reduced decomposition) to strongly positive (104% increased decomposition). Correlation and response surface analyses showed that priming intensity switched from negative to positive with increasing dissolved inorganic N:P across datasets. Algal effects on litter-periphyton stoichiometry and nutrient loss further co-varied with dissolved N:P across datasets, suggesting algae most strongly influence the stoichiometry of decomposition under imbalanced N:P, when priming is most intense. Our findings from this limited meta-analysis support the need for additional tests of aquatic priming effects, especially across gradients of N and P availability, with consideration of coupled C and nutrient dynamics during priming of organic matter decomposition

Reducing inequalities in health and diet: findings from a study on the impact of a food retail development

The health and diet impacts of a large-scale food retail development within a deprived area of Glasgow (Springburn) are reported. The study used a prospective quasi-experimental design which compared changes in diet and psychological health in an area where a new hypermarket was built (the intervention area), with a similarly-deprived comparison area in Glasgow (Shettleston). A postal survey was undertaken both before and one year after the hypermarket was built, to assess changes in diet, self-reported health, and perceptions of neighbourhood. Changes in the retail structure of both areas were assessed through a before and (repeated) after intervention shop count survey. Qualitative data on diet, the neighbourhood and the impact of the store were collected through focus groups. The quantitative study found limited improvements in diet and health. There was weak evidence for the impact of the hypermarket on population diet. There was weak evidence that poor psychological health in the intervention area reduced. Amongst those who ‘switched’ to the new hypermarket there was weak evidence of a small improvement in mean fruit and vegetable consumption but good evidence of psychological health improvement. Qualitative and retail survey results reinforce this, identifying perceptions of areal improvement through redevelopment and a small positive impact of the new store on the intervention area’s retail structure

Periphytic Algae Decouple Fungal Activity From Leaf Litter Decomposition Via Negative Priming

1. Well‐documented in terrestrial settings, priming effects describe stimulated heterotrophic microbial activity and decomposition of recalcitrant carbon by additions of labile carbon. In aquatic settings, algae produce labile exudates which may elicit priming during organic matter decomposition, yet the directions and mechanisms of aquatic priming effects remain poorly tested. 2. We tested algal‐induced priming during decomposition of two leaf species of contrasting recalcitrance, Liriodendron tulipifera and Quercus nigra, in experimental streams under light or dark conditions. We measured litter‐associated algal, bacterial, and fungal biomass and activity, stoichiometry, and litter decomposition rates over 43 days. 3. Light increased algal biomass and production rates, in turn increasing bacterial abundance 141%–733% and fungal production rates 20%–157%. Incubations with a photosynthesis inhibitor established that algal activity directly stimulated fungal production rates in the short term. 4. Algal‐stimulated fungal production rates on both leaf species were not coupled to long‐term increases in fungal biomass accrual or litter decomposition rates, which were 154%–157% and 164%–455% greater in the dark, respectively. The similar patterns on fast‐ vs. slow‐decomposing L. tulipifera and Q. nigra, respectively, indicated that substrate recalcitrance may not mediate priming strength or direction. 5. In this example of negative priming, periphytic algae decoupled fungal activity from decomposition, likely by providing labile carbon invested towards greater fungal growth and reproduction instead of recalcitrant carbon degradation. If common, algal‐induced negative priming could stimulate heterotrophy reliant on labile carbon yet suppress decomposition of recalcitrant carbon, modifying energy and nutrients available to upper trophic levels and enhancing organic carbon storage or export in well‐lit aquatic habitats

Healthy Cities: The Impact of Food Retail-led Regeneration on Food Access, Choice and Retail Structure

The health, social and planning policy agendas which have focused on the issue of food deserts, food access and food choice provide the context for this study of the outcomes of a large scale food retail intervention in Springburn, Glasgow. Through an analysis of changing retail structure and foodscape health impacts on food provision, food choice and physical and economic accessibility. This is set within the regeneration context of the Tesco St Rollox Partnership. Conclusions are reached on the potential for such schemes to deliver a range of diet, health, social, regeneration and planning policy goals

Algal-Mediated Priming Effects on the Ecological Stoichiometry of Leaf Litter Decomposition: A Meta-Analysis

In aquatic settings, periphytic algae exude labile carbon (C) that can significantly suppress or stimulate heterotrophic decomposition of recalcitrant C via priming effects. The magnitude and direction of priming effects may depend on the availability and stoichiometry of nutrients like nitrogen (N) and phosphorus (P), which can constrain algal and heterotrophic activity; in turn, priming may affect heterotrophic acquisition not only of recalcitrant C, but also N and P. In this study, we conducted a meta-analysis of algal-mediated priming across leaf litter decomposition experiments to investigate (1) bottom-up controls on priming intensity by dissolved N and P concentrations, and (2) effects of algal-mediated priming on the fate of litter-periphyton N and P during decomposition. Across a total of nine datasets, we quantified priming intensity and tested algal effects on litter-periphyton C:N, C:P, and N- and P-specific mass loss rates. Algal effect sizes did not significantly differ from zero, indicating weak or inconsistent algal effects on litter-periphyton stoichiometry and nutrient loss. These findings were likely due to wide variation in algal priming intensity across a limited number of experiments, ranging from strongly negative (410% reduced decomposition) to strongly positive (104% increased decomposition). Correlation and response surface analyses showed that priming intensity switched from negative to positive with increasing dissolved inorganic N:P across datasets. Algal effects on litter-periphyton stoichiometry and nutrient loss further co-varied with dissolved N:P across datasets, suggesting algae most strongly influence the stoichiometry of decomposition under imbalanced N:P, when priming is most intense. Our findings from this limited meta-analysis support the need for additional tests of aquatic priming effects, especially across gradients of N and P availability, with consideration of coupled C and nutrient dynamics during priming of organic matter decomposition

Retail-led Regeneration and Store Switching Behaviour

Retail-led regeneration of ‘food deserts’ has become accepted policy in the UK, although the impacts of such stores remain under-researched. It is assumed that residents will switch their shopping behaviour to the new store and then alter their purchasing patterns to include more healthy options. A pre- and post ‘intervention’ study in a deprived area and an equally deprived non-intervention area of Glasgow finds that high switching rates to the new store were identified, indicating some success in altering shopping behaviours. Many switched from large food stores outside the area to shopping within the area. Dietary patterns in the intervention area were maintained after store development; store switching did not induce dietary switching. Results suggest policy should be based on attempting to change both shopping and purchasing behaviours rather than assuming the latter will automatically be transformed by new retail spaces and offers