Quasi-modal vibration control by means of active control bearings

This paper investigates a design method of an active control bearing system with only velocity feedback. The study provides a new quasi-modal control method for a control system design of an active control bearing system in which feedback coefficients are determined on the basis of a modal analysis. Although the number of sensors and actuators is small, this quasi-modal control method produces a control effect close to an ideal modal control

Monitoring changes in skin temperature associated with exercise in horses on a water treadmill by use of infrared thermography

Infrared thermography (IRT) was used to assess surface temperature change as an indirect measure of muscle activity and exercise associated changes in blood flow in the working hind limb muscles of horses (n¼7) undergoing water tread mill exercise. Three treatments were investigated including the treadmill ran dry (TD), water at the height of the proximal interphalangeal joint (PIP) and water at the height of the carpus (CP). Maximum skin surface temperature was recorded from the region of these mitendinosus muscle during exercise at each water height. There was a significant difference in surface hind limb temperature between exercise on the water treadmill ran dry and with water at the height of the PIP and CP (Po0.0001) with hotter temperatures recorded during the TD treatment. There was a greater increase in surface temperature of the hind limbs from preexercise to maximum temperature during the PIP and CP treatments when compared to the TD treatment, however, this was not significant (P¼0.58). There was no significant difference in surface hind limb temperature found between exercise in water at the height of the PIP and water at the height of the CP. The findings from this study suggest that IRT is able to non-invasively detect muscle activity and associated changes in blood flow whilst horses are exercised on a water treadmill. IRT could potentially be used as an alternative method to assess muscle activity and temperature change in an aquatic environment where existing methods present methodological challenges

Acoustic interactions between an altitude test facility and jet engine plumes: Theory and experiments

The overall objective of the described effort was to develop an understanding of the physical mechanisms involved in the flow/acoustic interactions experienced in full-scale altitude engine test facilities. This is done by conducting subscale experiments and through development of a theoretical model. Model cold jet experiments with an axisymmetric convergent nozzle are performed in a test setup that stimulates a supersonic jet exhausting into a cylindrical diffuser. The measured data consist of detailed flow visualization data and acoustic spectra for a free and a ducted plume. It is shown that duct resonance is most likely responsible by theoretical calculations. Theoretical calculations also indicate that the higher discrete tones observed in the measurements are related to the screech phenomena. Limited experiments on the sensitivity of a free 2-D, C-D nozzle to externally imposed sound are also presented. It is shown that a 2-D, C-D nozzle with a cutback is less excitable than a 2-D C-D nozzle with no cutback. At a pressure ratio of 1.5 unsteady separation from the diverging walls of the nozzle is noticed. This separation switches from one wall to the opposite wall thus providing an unsteady deflection of the plume. It is shown that this phenomenon is related to the venting provided by the cutback section

MetaboTools: A comprehensive toolbox for analysis of genome-scale metabolic models

Metabolomic data sets provide a direct read-out of cellular phenotypes and are increasingly generated to study biological questions. Our previous work revealed the potential of analyzing extracellular metabolomic data in the context of the metabolic model using constraint-based modeling. Through this work, which consists of a protocol, a toolbox, and tutorials of two use cases, we make our methods available to the broader scientific community. The protocol describes, in a step-wise manner, the workflow of data integration and computational analysis. The MetaboTools comprise the Matlab code required to complete the workflow described in the protocol. Tutorials explain the computational steps for integration of two different data sets and demonstrate a comprehensive set of methods for the computational analysis of metabolic models and stratification thereof into different phenotypes. The presented workflow supports integrative analysis of multiple omics data sets. Importantly, all analysis tools can be applied to metabolic models without performing the entire workflow. Taken together, this protocol constitutes a comprehensive guide to the intra-model analysis of extracellular metabolomic data and a resource offering a broad set of computational analysis tools for a wide biomedical and non-biomedical research community

TEACHING MULTICULTURAL LITERATURE IN THE COLLEGE CLASSROOM

Due to a lack of research on the topic and events of 2020, this thesis aims to learn how professors teach multicultural literature to traditional undergraduate students and how students respond to these courses. I focus on pedagogical scholarship that notes the structure, challenges, and impact of teaching this genre in K-12 and higher education classrooms. My conclusions provide educators with a repertoire of teaching strategies, materials, and student feedback to help students critically respond to living in a multicultural nation and world. These conclusions also lessen a gap in research, as there is significantly less published information on teaching multicultural literature in higher education than in K-12 classrooms

The use of a Visual Instructional Plan to Promote Student Motivation and Achievement Within the Classroom

In response to the No Child Left Behind Act of 2001, teachers were challenged to develop and execute lessons that incorporated both mathematical concepts and accessible skills for real world application. This legislation, motivated by a desire to increase standards and accountabilities, was the impetus for the adoption of curriculum that requires the memorization of formulas and concepts as well as the ability to reach mathematical conclusions through reasoning and investigation. Many school districts have begun to take a look at the way math instruction is taught in the classroom. Historical perspectives reveal direct teaching methods as the foundation of the teaching style of the past while educators today recognize the need to seek more engaging and interactive instruction for their students. Beyond concern for acquired concepts is the equal desire to relieve any anxiety about math processes and ignite student motivation in this subject area. This thesis project explores the question, how do teachers present math concepts in a clear and concise manner that allows students to focus on the individual steps of a process rather than the process as a whole? The purpose of this study determines the effectiveness of using visuals and manipulatives to teach math in an eighth grade, self-contained classroom. The research author created and implemented a visually rich math program. This program was then used for a 4 week period to study potential increased student comprehension and reasoning in math. The special education class setting for the study was part of an urban school district in western New York. The self-contained class met five days a week, four days at forty-two minutes and one day at 30 minutes. The study implementation consisted of a direct teaching method, utilizing visuals to explore the concepts of multiplication and division of numbers, focusing on the strategies used to solve each concept. Students were provided with visual aids that contained strategies and pertinent vocabulary and could then also be used as references for their work. Conclusions for the study are drawn from analysis of bi-weekly grade reports, progress reports, anecdotal records, tests and assessments. The collected data supports the importance and reality that students exposed to an instructional plan that includes manipulatives and visuals show an increase in grade point average and a sense of student success. Students felt less anxious and expressed a motivation to learn rather than to avoid learning. The researcher\u27s observation showed students were more engaged and less confrontational or agitated during math instruction. This behavioral shift supports the current research findings that when students become active participants in the lesson their motivational level increases and they begin to take a vested interest in their learning

The Resummed Photon Spectrum in Radiative Upsilon Decays

We present a theoretical prediction for the photon spectrum in radiative Upsilon decay including the effects of resumming the endpoint region, E_\gamma -> M_\Upsilon/2. Our approach is based on NRQCD and the soft collinear effective theory. We find that our results give much better agreement with data than the leading order NRQCD prediction.Comment: 4 pages, 6 figure