GAN LIGHT EMISSION CONTROLLED DC-DC CONVERTER

This work demonstrates the very first implementation of electroluminescence from a gallium nitride vertical diode as a feedback mechanism for real-time current control of a power converter. Current estimation via electroluminescence provides a galvanically isolated sensor capability that is not susceptible to electromagnetic interference, which is inherently produced in switch mode power supplies. The light feedback is converted to an electrical signal that is further digitally filtered to construct a 3D current calibration surface. This surface converts duty cycle and light signal intensity into a real-time current estimation utilized as a feedback parameter in a buck converter control system. The accuracy of current estimation is shown to be within 5% of steady-state current over various load conditions. Transient-state response was also demonstrated for step changes in commanded current and voltage within the power converter. Methods of increasing accuracy and reducing current estimation delay time are discussed.Lieutenant, United States NavyApproved for public release. Distribution is unlimited

Energy Utilities and Competitiveness. ESRI Policy Series No. 24. April 1995

The importance of energy utilities, bath electricity and gas, in a mode economy is often underestimated. It is only when a problem occurs that public attention is, perforce, focused on their operations. However, their central economic role merits more constant and focused interest from policy makers. Throughout Europe there is a new interest in the operation of energy utilities and close attention is being paid to how they are structured, to the role of competition in ensuring efficient operation, to security of supply, and to the environmental consequences of the way they are operated. The Commission of the European Communities has made some of the running in recent years. However, as in so many other areas, the need to re-examine policy in Ireland stems primarily from our own requirements rather than from any external imperative

The Orion Pad Abort 1 Flight Test A Highly Successful Test

The Orion Pad Abort 1 (PA-1) flight test was designed as an early demonstration of the Launch Abort System (LAS) for the Orion capsule. The LAS was designed developed and manufactured by the Lockheed Martin/Orbital Sciences team. At inception it was realized that recovery of the Orion Capsule simulator would be useful from an engineering analysis and data recovery point of view. Additionally this test represented a flight opportunity for the Orion parachute system, which in a real abort would provide final landing deceleration. The Orion parachute program is named CPAS (CEV Parachute Assembly System). Thus CPAS became a part of the PA-1 flight, as a secondary test objective. At program kick off, the CPAS system was in the design state described below. Airbag land landing of the spacecraft was the program baseline. This affected the rigging of the parachutes. The system entry deployment conditions and vehicle mass have both evolved since that original design. It was decided to use the baseline CPAS Generation 1 (Gen 1) parachute system for the recovery of the PA-1 flight. As CPAS was a secondary test objective, the system would be delivered in its developmental state. As the PA-1 program evolved, the parachute recovery system (CPAS) moved from a secondary objective to a more important portion of the program. Tests were added, weights and deployment conditions changed and some hardware portions of the CPAS configuration were not up to the new challenges. Additional tests were added to provide confidence in the developmental system. This paper will review a few of these aspects with the goal of showing some preliminary and qualitative results from what we believe was a highly successful test

ENSURING TRUSTWORTHINESS OF INCIDENT EVIDENCE DATA GENERATED BY THINGS

Techniques are provided that leverage blockchain technology to ensure that evidence that is recorded by things of an incident is saved and shared with interested parties in a method that ensures the trustworthiness of the evidence data. A thing, a local fog router, or a central integrity service might save evidence trustworthiness data to a blockchain. Complementary methods are also provided that bolster the solution’s applicability to connected cities and other implementation opportunities

Contact matters: voters like to be asked personally for their support

Ed Miliband has announced that to counter the Conservative party’s financial advantage during the 2015 election campaign Labour will outnumber them in supporters out on the streets engaging with voters – and will benefit accordingly. Is that a sensible strategy? David Cutts, Ed Fieldhouse, Justin Fisher, Ron Johnston and Charles Pattie have done a lot of research into the impact of local campaigns and use data from the 2010 election to assess whether Labour’s strategy will bring the hoped-for benefits

Jeans Instability in a Tidally Disrupted Halo Satellite Galaxy

We use a hybrid test particle/N-body simulation to integrate 4 million massless test particle trajectories within a fully self-consistent 10^5 particle N-body simulation. The number of massless particles allows us to resolve fine structure in the spatial distribution and phase space of a dwarf galaxy as it is disrupted in the tidal field of a Milky Way type galaxy. The tidal tails exhibit nearly periodic clumping or a smoke-like appearance. By running simulations with different satellite particle mass, halo particle mass, number of massive and massless particles and with and without a galaxy disk, we have determined that the instabilities are not due to numerical noise, amplification of structure in the halo, or shocking as the satellite passes through the disk of the Galaxy. We measure Jeans wavelengths and growth timescales in the tidal tail and show that the Jeans instability is a viable explanation for the clumps. We find that the instability causes velocity perturbations of order 10 km/s. Clumps in tidal tails present in the Milky Way could be seen in stellar radial velocity surveys as well as number counts. We find that the unstable wavelength growth is sensitive to the simulated mass of dark matter halo particles. A simulation with a smoother halo exhibits colder and thinner tidal tails with more closely spaced clumps than a simulation with more massive dark matter halo particles. Heating by the halo particles increases the Jeans wavelength in the tidal tail affecting substructure development, suggesting an intricate connection between tidal tails and dark matter halo substructure.Comment: 15 pages, 7 figures, submitted to MNRAS, May 25 201

Senior Recital: Justin Brookins, viola

This recital is presented in partial fulfillment of requirements for the degree Bachelor of Music in Performance. Mr. Brookins studies viola with Allyson Fleck and Cathy Lynn.https://digitalcommons.kennesaw.edu/musicprograms/1230/thumbnail.jp

Statistical methods for analyzing immunosignatures

<p>Abstract</p> <p>Background</p> <p>Immunosignaturing is a new peptide microarray based technology for profiling of humoral immune responses. Despite new challenges, immunosignaturing gives us the opportunity to explore new and fundamentally different research questions. In addition to classifying samples based on disease status, the complex patterns and latent factors underlying immunosignatures, which we attempt to model, may have a diverse range of applications.</p> <p>Methods</p> <p>We investigate the utility of a number of statistical methods to determine model performance and address challenges inherent in analyzing immunosignatures. Some of these methods include exploratory and confirmatory factor analyses, classical significance testing, structural equation and mixture modeling.</p> <p>Results</p> <p>We demonstrate an ability to classify samples based on disease status and show that immunosignaturing is a very promising technology for screening and presymptomatic screening of disease. In addition, we are able to model complex patterns and latent factors underlying immunosignatures. These latent factors may serve as biomarkers for disease and may play a key role in a bioinformatic method for antibody discovery.</p> <p>Conclusion</p> <p>Based on this research, we lay out an analytic framework illustrating how immunosignatures may be useful as a general method for screening and presymptomatic screening of disease as well as antibody discovery.</p