Generating optimized Fourier interpolation routines for density function theory using SPIRAL

© 2015 IEEE.Upsampling of a multi-dimensional data-set is an operation with wide application in image processing and quantum mechanical calculations using density functional theory. For small up sampling factors as seen in the quantum chemistry code ONETEP, a time-shift based implementation that shifts samples by a fraction of the original grid spacing to fill in the intermediate values using a frequency domain Fourier property can be a good choice. Readily available highly optimized multidimensional FFT implementations are leveraged at the expense of extra passes through the entire working set. In this paper we present an optimized variant of the time-shift based up sampling. Since ONETEP handles threading, we address the memory hierarchy and SIMD vectorization, and focus on problem dimensions relevant for ONETEP. We present a formalization of this operation within the SPIRAL framework and demonstrate auto-generated and auto-tuned interpolation libraries. We compare the performance of our generated code against the previous best implementations using highly optimized FFT libraries (FFTW and MKL). We demonstrate speed-ups in isolation averaging 3x and within ONETEP of up to 15%

Supercontinuum generation in the vacuum ultraviolet through dispersive-wave and soliton-plasma interaction in noble-gas-filled hollow-core photonic crystal fiber

We report on the generation of a three-octave-wide supercontinuum extending from the vacuum ultraviolet (VUV) to the near-infrared, spanning at least 113 to 1000 nm (i.e., 11 to 1.2 eV), in He-filled hollow-core kagome-style photonic crystal fiber. Numerical simulations confirm that the main mechanism is a novel and previously undiscovered interaction between dispersive-wave emission and plasma-induced blueshifted soliton recompression around the fiber zero dispersion frequency. The VUV part of the supercontinuum, which modeling shows to be coherent and possess a simple phase structure, has sufficient bandwidth to support single-cycle pulses of 500 attosecond duration. We also demonstrate, in the same system, the generation of narrower-band VUV pulses, through dispersive-wave emission, tunable from 120 to 200 nm with efficiencies exceeding 1% and VUV pulse energies in excess of 50 nJ.Comment: 7 pages, 5 figure

Falls across Lancashire (April 2013 to March 2016)

Falls are the second leading cause of death from accidents worldwide and adults aged over 65 years suffer the greatest number of fatal falls. Between April 2013 and March 2016, there were 63,398 ambulance call outs and 17,182 emergency hospital admissions for falls in Lancashire. This TIIG Lancashire report presents data and analyses relating to ambulance call outs and emergency hospital admissions for falls using North West Ambulance Service (NWAS) and Hospital Episodes Statistics (HES) data. Trends are presented in terms of demographics, call out locations and patient geography. Comparisons are also drawn between NWAS and HES data, particularly in terms of age standardised rates per 1,000 population for given geographical areas

Location of violent incidents across Lancashire (April 2013 to March 2016)

Violence is a preventable public health problem and yet there are over one million violent incidents each year in England and Wales, approximately half of which involve alcohol and one-quarter of which occur in night-time economy environments. Between April 2013 and March 2016 there were 14,427 attendances to Lancashire Emergency Departments (EDs) by residents of Lancashire for injuries sustained from violence. This TIIG Lancashire report presents data and analyses relating to the locations of violence, specifically in terms of patient area of residence, as determined by ED data, and ambulance call out location, as determined by North West Ambulance Service (NWAS) data. Trends are also presented in terms of geographic compositions of assault ED attendances/ambulance call outs, deprivation and, in terms of ED data, incident location categories and attendance details. Analyses also compare ED data (patient geography) with NWAS data (location geography), particularly in terms of attendance/call out numbers and rates by local/unitary authority areas and lower super output areas

TIIG Cumbria overview report: Emergency Department data collection and overview (April 2012 to March 2015)

Reducing intentional and unintentional injuries is a key objective of Cumbria County Council and public health professionals, service providers and other organisations that make up Community Safety Partnerships (CSPs) within Cumbria. Emergency Departments (EDs) can play a central and leading role, not only in providing rich and timely data, but in providing objective and informed recommendations for targeted prevention measures and interventions. This Trauma and Injury Intelligence Group (TIIG) themed report presents an overview of unintentional and intentional injuries in Cumbria, primarily using ED recorded data between April 2012 and March 2015. Data are discussed within the context of demographic trends and socioeconomic factors, including levels of deprivation. While ED data collection is generally excellent in Cumbria, there are several areas where data collection and quality may be improved. This report discusses these key data issues with particular focus on injury groups and enhanced assault information

Alcohol-related violence across Lancashire (April 2013 to March 2016)

Violence is a preventable public health problem and yet there are over one million violent incidents each year in England and Wales, approximately half of which involve alcohol and one-quarter of which occur in night-time economy environments. Between April 2013 and March 2016 there were 14,427 attendances to Lancashire Accident and Emergency Departments (AEDs) by residents of Lancashire for injuries sustained from violence. This TIIG Lancashire report presents data and analyses relating to alcohol-related violence; where data were recorded, alcohol was consumed prior to an assault attendance in 44% of incidents. This report presents AED attendances for violence across Lancashire in terms of demographics, area of residence, attendance rates and attendance information (including incident location, referral source, arrival mode and disposal method) between April 2013 and March 2016. Using alcohol-related data collected by two of the trusts, case studies are also provided for Chorley, Preston, South Ribble and West Lancashire local authorities