134 research outputs found
Exploring links between diabetes and depression
Some people may think mental health and physical health are completely unrelated, but in fact, they are closely linked, says Dr. Briana Mezuk, a researcher and professor at VCU. She recently received a grant from the C. Kenneth and Dianne Wright Center for Clinical and Translational Research at VCU to study the relationship between diabetes and depression
Songbird’s Winter Grounds Face Environmental Threats
VCU graduate biology student Jessica Reese has documented the environmental threats facing the prothonotary warbler. Development has depleted the mangrove forests of Panama and Colombia where these gray and yellow songbirds spend the winter months
Increasing eigenstructure assignment design degree of freedom using lifting
This paper presents the exposition of an output-lifting eigenstructure assignment (EA) design framework, wherein the available EA design degrees of freedom (DoF) is significantly increased, and the desired eigenstructure of a single-rate full state feedback solution can be achieved within an output feedback system. A structural mapping is introduced to release the output-lifting causality constraint. Additionally, the available design DoF can be further enlarged via involving the input-lifting into the output-lifting EA framework. The newly induced design DoF can be utilised to calculate a structurally constrained, causal gain matrix which will maintain the same assignment capability. In this paper, the robustification of the output-lifting EA is also proposed, which allows a trade-off between performance and robustness in the presence of structured model uncertainties to be established. A lateral flight control benchmark in the EA literature and a numerical example are used to demonstrate the effectiveness of the design framework
Phosphoenolpyruvate carboxykinase, pyruvate orthophosphate dikinase and isocitrate lyase in both tomato fruits and leaves, and in the flesh of peach and some other fruits
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Arduino-Based Small Scale Electric Brewing System
The goal of this project is to create a small-scale, low cost, electric home brewing system that allows a user to more easily brew large (5 gallon) batches of beer in an enclosed space. This is accomplished by using an Arduino microcontroller in conjunction with a Yun WiFi shield to host a local website which allows a user to enter a temperature into the system via their phone, tablet, or computer. This data is then passed from a website running on the Yun shield to the Arduino sketch which runs a check against the current temperature reported by a thermometer installed in the brewing kettle and switches a heating element on or off depending on the goal temperature set by the user.
This process is meant to be a more precise method of temperature control that allows the user to brew higher ABV beer than other common homebrew setups and will require less of the user's time in terms of monitoring temperature.
Data taken from brewing several batches using the completed brew kettle does suggest that more precise control of temperature increases the efficiency of saccharification during a mash phase, and thus increases alcohol by volume in the final product
Développement d'une plateforme de communication sol-air pour les systèmes avioniques du futur
RÉSUMÉ: RÉSUMÉ Face à l’augmentation de la densité du trafic aérien dans les années à venir, la gestion de l’information à l’échelle du système (SWIM) apparaît comme une technologie émergente qui sera largement exploitée dans l’industrie aéronautique à l’avenir. Ce système permettra de répondre à des événements imprévus pendant les vols. L’infrastructure de communication entre le sol et l’avion pour assurer l’échange des données n’est cependant pas encore déployée. Parallèlement, la nécessité d’améliorer l’intégration de ces nouvelles données dans les cockpits a été soulevée. Face à la grande quantité de données rendues disponibles, leur présentation sur les affichages de bord est cruciale. Ce travail de recherche a permis de développer SWIMAIR, une plateforme d’échange et de filtrage de messages SWIM, pouvant être liée avec des logiciels de création d’interfaces. Ceci est permis par l’utilisation du portail SWIFT mis à disposition par l’Administration fédérale de l’aviation (FAA) et offrant l’accès aux données issues du SWIM. Les principales fonctions de la plateforme permettent l’acquisition des messages auprès du portail, leur analyse basée sur la comparaison des noeuds XML avec les filtres appliqués, et leur envoi au travers de sockets TCP/IP. Une communication éditeur-abonné est ainsi instaurée afin de garantir à l’avion la réception des messages le concernant. La caractérisation de la plateforme développée a été réalisée par le biais d’un test de la quantité de messages analysés et reçus par l’avion dans des aéroports de différentes tailles. Elle nous permet ainsi de traiter plus de 30 000 messages par minute et d’en extraire des messages d’intérêt en fonction des filtres appliqués. Elle permettra par exemple d’alimenter les interfaces avec plus de 1 000 messages par minute lors de son utilisation dans un contexte optimal, s’intéressant à des vols entre des aéroports majeurs lors des heures de pointe. L’étude des performance montre le faible impact temporel de la plateforme sur l’acheminement des messages. Ce travail constitue ainsi le point de départ d’une série d’études en facteurs humains sur la création et l’intégration de nouvelles interfaces se basant sur les données issues du SWIM. ABSTRACT: ABSTRACT As the density of air traffic increases in the coming years, System Wide Information Management (SWIM) is recognized to be an emerging technology that will be widely exploited in aviation industry in a near future. This system will enable responses to unexpected events during flights. However, the ground-to-aircraft communications infrastructure for data exchange has yet to be deployed. Meanwhile, the need for improvements in terms of integration of these new data in the cockpits has been raised. Faced with the large amount of data made available, their presentation on the on-board displays is crucial. In this research work we developed a platform, called SWIMAIR, for SWIM message exchange and filtering, which can be linked with interface creation software. This is made possible by the use of the SWIFT portal provided by the Federal Aviation Administration (FAA) and offering access to SWIM data. The main functions of the platform allow the acquisition of messages from the portal, their analysis based on the comparison of the XML nodes with the applied filters, and their sending via a data link based on TCP/IP sockets. A publisher-subscriber air-ground network connectivity is thus established in order to guarantee the reception of messages concerning the aircraft. Characterization of the developed platform has been carried out via the test of the quantity of messages analyzed and received by the aircraft in airports of different sizes. More than 30,000 messages per minute are processed by the platform and messages of interest are extracted according to the filters applied. For example, it will allow us to feed the interfaces with more than 1,000 messages per minute when used in an optimal context, focusing on flights between major airports during peak hours. The performance study shows that the platform has little impact on message routing over time. This work is the starting point for a series of human factors studies on the creation and integration of new interfaces based on SWIM data
Remarques sur les théories de la diffraction électronique
L'auteur examine d'abord la théorie dynamique de Bethe-Kikuchi et montre que les conditions aux limites employées, qui sont très peu sûres, changent considérablement le domaine angulaire de réflexion totale à l'intérieur et à l'extérieur du cristal, le résultat obtenu étant incompatible avec les résultats expérimentaux. Si on admet au contraire que le passage du cristal dans le vide change peu le domaine de réflexion totale, on obtient ainsi une largeur de la tache de diffraction faible à côté de celle due aux autres causes d'élargissement. L'auteur montre ensuite la possibilité de tenir compte de l'absorption en considérant le cristal comme un réseau de diffraction à trois dimensions
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