The Nile Reservoirs

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Planar photonic crystal

We present results of guiding light in a single-line-defect planar photonic crystal (PPC) waveguide with 90° and 60° bends. The wave guiding is obtained by total internal reflection perpendicular to the plane of propagation and by the photonic band gap for the 2D photonic crystal in the plane. The results for photonic waveguiding are shown and demonstrated at 1.5 µm wavelength

Photonic Crystal Cavities and Waveguides

Recently, it has also become possible to microfabricate high reflectivity mirrors by creating two- and three-dimensional periodic structures. These periodic "photonic crystals" can be designed to open up frequency bands within which the propagation of electromagnetic waves is forbidden irrespective of the propagation direction in space and define photonic bandgaps. When combined with high index contrast slabs in which light can be efficiently guided, microfabricated two-dimensional photonic bandgap mirrors provide us with the geometries needed to confine and concentrate light into extremely small volumes and to obtain very high field intensities. Here we show the use of these "artificially" microfabricated crystals in functional nonlinear optical devices, such as lasers, modulators, and waveguides

Cladding strategies for building-integrated photovoltaics

Photovoltaic cladding on the surfaces of commercial buildings has the potential for considerable reductions in carbon emissions due to embedded renewable power generation displacing conventional power utilization. In this paper, a model is described for the optimization of photovoltaic cladding densities on commercial building surfaces. The model uses a modified form of the ‘fill factor’ method for photovoltaic power supply coupled to new regression-based procedures for power demand estimation. An optimization is included based on a defined ‘mean index of satisfaction’ for matched power supply and demand (i.e., zero power exportation to the grid). The mean index of satisfaction directly translates to the reduction in carbon emission that might be expected over conventional power use. On clear days throughout the year, reductions of conventional power use of at least 60% can be achieved with an optimum cladding pattern targeted to lighting and small power load demands

Routine data linkage to identify and monitor diabetes in clozapine-treated patients with schizophrenia

No abstract available

PLANTAR FORCE MEASURES DURING FORWARD SKATING IN ICE HOCKEY

The purpose of this project was to measure plantar pressure patterns during forward skating with ice hockey skates. Six elite ice hockey inter-university players volunteered to participate in the study. There was no significant change in push off force with velocity, but there was a decrease in contact time with increasing velocity. Given the decreased impulse with increasing speed, the increase in propulsion was the result of increasing stride rate. Comparison between anterior and posterior plantar regions as well as the medial and lateral regions revealed proportional loading changes with different speeds

THE PERFORMANCE OF THE ICE HOCKEY SLAP SHOT: THE EFFECTS TO STICK CONSTRUCTION AND PLAYER SKILL

The purpose of this study was to examine the interaction of players’ skill level, body strength, and sticks of various construction and stiffness on the performance of the slap shot in ice hockey. Twenty male players were tested: ten skilled, and ten unskilled. Each subject performed three slap shots with three sticks of different construction and shaft stiffness. Ground contact forces were measured while simultaneously video recording at 480 frames/second the stick movement and bending. The results indicated that 1) puck velocity was influenced by skill level and body strength but not stick type and that 2) variability in performance measures across subjects was greater than the variability across the stick stiffness. Further studies are needed to address the specific influence body strength and skill on the slap shot

KINEMATICS OF THE FOOT AND ANKLE IN FORWARD ICE HOCKEY SKATING

Three elite ice hockey players performed forward skating with twin axis electro-goniometers placed posterior to the right ankle and rear foot. The data were gathered at a sampling frequency of 200 Hz. The use of mini notebook computer and data acquisition card allowed for a completely portable system. Maximum and minimum range of motion data were averaged for inversion-eversion and dorsiflexion-plantarflexion motions were examined throughout one stride cycle

Transmission of pillar-based photonic crystal waveguides in InP technology

Waveguides based on line defects in pillar photonic crystals have been fabricated in InP/InGaAsP/InP technology. Transmission measurements of different line defects are reported. The results can be explained by comparison with two-dimensional band diagram simulations. The losses increase substantially at mode crossings and in the slow light regime. The agreement with the band diagrams implies a good control on the dimensions of the fabricated features, which is an important step in the actual application of these devices in photonic integrated circuit

Mental health in UK Biobank - development, implementation and results from an online questionnaire completed by 157 366 participants: a reanalysis

Background UK Biobank is a well-characterised cohort of over 500 000 participants including genetics, environmental data and imaging. An online mental health questionnaire was designed for UK Biobank participants to expand its potential. Aims Describe the development, implementation and results of this questionnaire. Method An expert working group designed the questionnaire, using established measures where possible, and consulting a patient group. Operational criteria were agreed for defining likely disorder and risk states, including lifetime depression, mania/hypomania, generalised anxiety disorder, unusual experiences and self-harm, and current post-traumatic stress and hazardous/harmful alcohol use. Results A total of 157 366 completed online questionnaires were available by August 2017. Participants were aged 45–82 (53% were ≥65 years) and 57% women. Comparison of self-reported diagnosed mental disorder with a contemporary study shows a similar prevalence, despite respondents being of higher average socioeconomic status. Lifetime depression was a common finding, with 24% (37 434) of participants meeting criteria and current hazardous/harmful alcohol use criteria were met by 21% (32 602), whereas other criteria were met by less than 8% of the participants. There was extensive comorbidity among the syndromes. Mental disorders were associated with a high neuroticism score, adverse life events and long-term illness; addiction and bipolar affective disorder in particular were associated with measures of deprivation. Conclusions The UK Biobank questionnaire represents a very large mental health survey in itself, and the results presented here show high face validity, although caution is needed because of selection bias. Built into UK Biobank, these data intersect with other health data to offer unparalleled potential for crosscutting biomedical research involving mental health