Investigation of mid-infrared AlInSb LEDs with an n-i-p structure

We report on the investigation on mid-infrared AlInSb LEDs with an n-i-p structure. Compared to the conventional AlInSb LEDs with a p-i-n structure, a better current spreading corresponding to a uniform current distribution in the active region is expected in the n-i-p structure because of a high electron mobility in the n-type AlInSb material. The output optical power of laterally injected LEDs were investigated as a function of the device geometry by COMSOL simulations and confirmed by experimental results

Machine learning classification of human joint tissue from diffuse reflectance spectroscopy data

Objective: To assess if incorporation of DRS sensing into real-time robotic surgery systems has merit. DRS as a technology is relatively simple, cost-effective and provides a non-contact approach to tissue differentiation. Methods: Supervised machine learning analysis of diffuse reflectance spectra was performed to classify human joint tissue that was collected from surgical procedures. Results: We have used supervised machine learning in the classification of a DRS human joint tissue data set and achieved classification accuracy in excess of 99%. Sensitivity for the various classes were; cartilage 99.7%, subchondral 99.2%, meniscus 100% and cancellous 100%. Full wavelength range is required for maximum classification accuracy. The wavelength resolution must be larger than 8nm. A SNR better than 10:1 was required to achieve a classification accuracy greater than 50%. The 800-900nm wavelength range gave the greatest accuracy amongst those investigated. Conclusion: DRS is a viable method for differentiating human joint tissue and has the potential to be incorporated into robotic orthopaedic surgery

Modeling of light-sensitive resonant-tunneling-diode devices

We present a method to include the effects of light excitation on two different models of resonant-tunneling-diode-based devices. Our approach takes into account both photoconductive and charge accumulation effects responsible for shifting the static I –V curve when the structure is under light excitation. Computational simulations led to good agreement between the model and experimental result

Antimicrobial Synergy Testing : Comparing the Tobramycin and Ceftazidime Gradient Diffusion Methodology Used in Assessing Synergy in Cystic Fibrosis-Derived

Funding: This research was funded by the NHS Grampian Endowment fund, grant number EA9431, and the NHS Grampian Clinical Microbiology Fund (NHS Grampian Endowment Funds, Registered Charity Number SC017296). Acknowledgments: The authors would like to thank the laboratories and clinicians who use the Cystic Fibrosis Susceptibility Testing Service. CFASS is an adult patient-testing facility, funded by the National Services Division of the Common Services Agency of the Scottish Executive.Peer reviewedPublisher PD

FIG Commission 4 – Hydrography Work Plan (2019-2022) and Commission Activities

The International Federation of Surveyors (FIG) technical work is led by ten Commissions. Hydrography is represented by Commission 4. FIG Commission 4 is focusing on development and recognition of standards of competency, development of technical standards and guidelines, developing and promoting the need to manage the oceans and seas in a sustainable manner, and a comprehensive investigation of plastic pollution at source that is concerning global environmental problem (“Mapping the Plastic”). Through all its Working Groups, Commission 4 has been actively involved in implementing its policy by working in close cooperation with relevant organisations and institutions. Commission 4 is committed with the continuous collaboration between educational institutions, non-government organisations and the Young Surveyors Network in research and development, as well as, community engagement and the realisation of United Nations Sustainable Development Goal 14 (UN SDG 14)