Efficiency Testing of an Electronic Speed Controller

This project required the development of a rig that could experimentally determine the efficiency of an Electronic Speed Controller (ESC). The selected design focuses on measuring the losses due to heat from the device and comparing this to its input power. The selected design is a flow rig that utilizes the heat equation q=ṁcpΔT. The rig provides a steady state measurement of the ESC heat output by passing a known mass flow rate of air across the ESC and measuring the temperature difference. It uses a flowmeter to determine ṁ, thermocouples to determine ΔT, and a table lookup to determine cp. After testing with a known heat source of a DC-powered silicon heater, It was found that at a flowrate of 30 L/min, the rig is able to capture greater than 90% of the heat emitted from a range of 2.5 to 10 Watts. This rig is recommended for use in testing the heat losses of an Electronic Speed Controller as well as any other small form factor, constant heat-emitting devices

Dissociation and isomerization of vibrationally excited species. II. Unimolecular reaction rate theory and its application

Data on quasi-unimolecular reactions have usually been compared with theoretical equations based on classical treatments, because the expressions are simpler than those obtained on the basis of a quantum model. The quantum reformulation of the RRK theory in Part I is used to compute the pressure dependence of the rate constants and the limiting low-pressure rates for a variety of unimolecular reactions without employing adjustable parameters. An asymptotic expansion of the integral for the limiting low-pressure second-order rate constant provides a very simple expression for this quantity.The errors inherent in corresponding classical calculations are estimated by comparing these results with those obtained from the theory in its classical limit. The error is temperature dependent and at low pressures increases from a factor of about three (under typical experimental conditions) for small reactants such as O3 and N2O to 105 or more for large molecules such as cyclopropane, C2H6, and N2O5. In most cases the rates calculated from the quantum form are in reasonable agreement with those obtained experimentally when all of the reactant oscillators are assumed effective in intramolecular energy transfer

Factors Affecting Posterior Capsule Opacification in the Development of Intraocular Lens Materials

Posterior capsule opacification (PCO) is the most common complication arising from the corrective surgery used to treat cataract patients. PCO arises when lens epithelial cells (LEC) residing in the capsular bag post-surgery undergo hyper-proliferation and transdifferentiation into myofibroblasts, migrating from the posterior capsule over the visual axis of the newly implanted intraocular lens (IOL). The developmental pathways underlying PCO are yet to be fully understood and the current literature is contradictory regarding the impact of the recognised risk factors of PCO. The aim of this review is firstly to collate the known biochemical pathways that lead to PCO development, providing an up-to-date chronological overview from surgery to established PCO formation. Secondly, the risk factors of PCO are evaluated, focussing on the impact of IOLs’ properties. Finally, the latest experimental model designs used in PCO research are discussed to demonstrate the ongoing development of clinical PCO models, the efficacy of newly developed IOL technology, and potential therapeutic interventions. This review will contribute to current PCO literature by presenting an updated overview of the known developmental pathways of PCO, an evaluation of the impact of the risk factors underlying its development, and the latest experimental models used to investigate PCO. Furthermore, the review should provide developmental routes for research into the investigation of potential therapeutic interventions and improvements in IOL design in the aid of preventing PCO for new and existing patients

THE SEATED-SINGLE-ARM-ROW AS A POST-ACTIVATION POTENTIATION EXERCISE TO ENHANCE POWER OUTPUT DURING KAYAKING ON AN ERGOMETER

This study investigated if the seated-single-arm-row (SSAR) could be used as a post-activation-potentiation-exercise (PAPE) during warm up to induce enhanced power output during kayaking on an ergometer. Ten well-trained kayakers (4 females, 6 males) performed three repetitions of the SSAR at 91% one-repetition maximum as the PAPE. Participants were assessed for their peak and average power output while performing 14 maximal effort strokes on a kayak ergometer; to simulate a race start; with versus without PAPE as a warm up, at three-minute intervals up to 18 minutes. Mean peak power with PAPE was found to be approximately 6% higher (1172.5 vs 1106.8 W) compared with no PAPE, t(9)=2.61, p=0.03. No differences in mean average power were found. Six out of the 10 kayakers registered higher mean peak and average power in one of their experimental trials compared with their control trial. These kayakers could be positive responders to PAPE. The SSAR performed during warm up enabled kayakers to increase their peak power output when paddling on an ergometer, but did not result in higher average power output. The utility of the SSAR as a PAPE to enhance overall power output when paddling on an ergometer, with the perspective of applying this technique to enhance performance during on-water kayaking, requires further investigation

Post-caesarean section surgical site infection: rate and risk factors

Aim To identify the incidence of surgical site infection (SSI) post-caesarean section, and important contributory risk factors. Method A retrospective analysis was conducted to identify cases with SSI, using as a population all the caesarean sections fo

Project C.O.R.E.: Coaching Opportunities with Real Experiences

Retention and graduation rates of VCU men of color (MOC) is significantly lower than white men and women of color. Due to demonstrated significant attrition occurring after the sophomore year, Project C.O.R.E. (Coaching Opportunities with Real Experiences) is proposed as a sophomore-focused program that builds upon an existing freshman course on professional development for MOC. While the first-year course introduces students to a VCU support network, Project C.O.R.E. aims to increase university retention by expanding the student support network to members of the local community. Students are paired with community coaches, predominantly VCU alumni, to enhance their career and life-skills development. This program provides continued community, guidance, and support to encourage MOC to continue on the path to graduation

Biology Education Research. Contemporary topics and directions

This volume consists of 29 original papers presented at the 12th Conference of European Researchers in Didactics of Biology (ERIDOB) organized by the University of Zaragoza in collaboration with University de Santiago de Compostela, hosted in July 2018 by the Faculty of Education, University of Zaragoza, Spain. Recognizing the importance and potential of being well-trained in biology, the bi-annual Conference of ERIDOB is now a firmly established and leading forum for European and non-European researchers to discuss and reflect on research in biology education, to find new ways of ensuring continued advances in teaching and learning this discipline. Biology is a field of research in constant growth. Its advances have brought not only enormous benefits to humanity in fields from Human Biology to Ecology, but also great repercussions in our daily lives. This context makes it necessary for biology education to equip young people with the tools and resources needed to become scientifically literate, critical thinkers and social activists. Some of these concerns are highlighted in this book, whose 29 papers have been selected after having passed a double blind review process by at least one member of the ERIDOB Academic Committee together with an experienced reviewer of the ERIDOB academic community. In the introduction of this volume the keynote conference, How to gather and analyse quality evidence about successful biology classrooms, presented by María Pilar Jiménez Aleixandre, methodological issues related to classroom studies are addressed. Special attention is on qualitative research studies and on successful biology teaching and learning with a double goal: 1) debriefing the processes leading to quality research studies; 2) providing teachers with models, rather than focusing on the problems of unsuccessful teaching

Éclipsé par l'observation : comment les étudiants en médecine canadiens vivent-ils l’observation?

Background: Preclinical medical students commonly perceive shadowing as beneficial for career exploration. However, research is sparse on the broader impact of shadowing as a learning strategy. We explored students’ perceptions and lived experiences of shadowing to understand its role and impact on their personal and professional lives. Methods: Between 2020-2021, individual semi-structured video interviews were conducted with 15 Canadian medical students in this qualitative descriptive study. Inductive analysis proceeded concurrently with data collection until no new dominant concepts were identified. Data were iteratively coded and grouped into themes. Results: Participants described internal and external factors that moulded shadowing experiences, arising tensions between intended and perceived experiences, and how these lived experiences impacted their wellness. Internal factors associated with shadowing behaviour included: 1) aspiring to be the best and shadowing to demonstrate excellence, 2) shadowing for career exploration, 3) shadowing as learning opportunities for early clinical exposure and career preparedness, and 4) reaffirming and redefining professional identity through shadowing. External factors were: 1) unclear residency match processes which position shadowing as competitive leverage, 2) faculty messaging that perpetuates student confusion around the intended value of shadowing, and 3) social comparison in peer discourse, fuelling a competitive shadowing culture. Conclusions: The tension between balancing wellness with career ambitions and the unintended consequences of unclear messaging regarding shadowing in a competitive medical culture highlights issues inherent in shadowing culture.Contexte : De manière générale, les étudiants en médecine préclinique considèrent que l’observation présente une occasion intéressante d’explorer les possibilités de carrière. Cependant, peu de recherches ont été menées sur l’impact plus large de l’observation comme stratégie d’apprentissage. Nous avons exploré les perceptions et les expériences vécues des étudiants en matière d’observation afin de comprendre son rôle et ses répercussions sur leur vie personnelle et professionnelle. Méthodes : Dans le cadre de cette étude qualitative descriptive, entre 2020 et 2021, des entretiens vidéo individuels semi-structurés ont été menés avec 15 étudiants en médecine canadiens. L’analyse inductive s’est déroulée simultanément à la collecte des données jusqu’à ce qu’aucun concept dominant nouveau n’apparaisse. Les données ont été codées de manière itérative et regroupées en thèmes. Résultats : Les participants ont décrit les facteurs internes et externes qui ont façonné leur expérience de l’observation et les tensions qui en ont découlé, ainsi que l’impact de ces expériences sur leur bien-être. Les facteurs internes associés au comportement d’observation sont les suivants : 1) vouloir être le meilleur et faire de l’observation pour montrer son excellence, 2) faire de l’observation dans le but d’explorer les débouchés de carrière, 3) faire de l’observation pour apprendre par l’exposition clinique précoce et pour se préparer à la carrière, et 4) réaffirmer et redéfinir l’identité professionnelle par l’observation. Les facteurs externes sont 1) le manque de clarté dans les processus de jumelage des résidents pouvant donner l’impression que l’observation est un atout, 2) le discours enseignant qui entretient la confusion des étudiants quant à la valeur de l’observation, et 3) la comparaison sociale dans le discours des pairs, alimentant une culture de l’observation compétitive. Conclusions : La difficulté de trouver un équilibre entre le bien-être et les ambitions professionnelles, et les conséquences involontaires d’un discours peu clair concernant l’observation dans le contexte d’un climat compétitif mettent en évidence les problèmes inhérents à la culture de l’observation