The primary aims of this study were (1) to evaluate whole-body mechanical efficiency (ME) in a large group of chronic obstructive pulmonary disease (COPD) patients with a wide range of degrees of illness and (2) to examine how ME in COPD is related to absolute work rate and indices of disease severity during exercise testing. A total of 569 patients (301 male patients; GOLD stage I: 28, GOLD stage II: 166, GOLD stage III: 265, and GOLD stage IV: 110) with chronic obstructive pulmonary disease (COPD) were included in the data analysis. Individual maximal workload (watt), peak minute ventilation ((Equation is included in full-text article.)E, L/min body temperature and pressure, saturated), and peak oxygen uptake ((Equation is included in full-text article.)O2, mL/min standard temperature and pressure, dry) were determined from a maximal incremental cycle ergometer test. Ventilatory and metabolic response parameters were collected during a constant work rate test at 75% of the individual maximal workload. From the exercise responses of the constant work rate test, the gross ME was calculated. The mean whole-body gross ME was 11.0 ± 3.5% at 75% peak power. The ME declined significantly (P < .001) with increasing severity of the disease when measured at the same relative power. Log-transformed absolute work rate (r = .87, P < .001) was the strongest independent predictor of gross ME. Body mass was the single other variable that contributed significantly to the linear regression model. Gross ME in COPD was largely predicted by the absolute work rate (r = .87; P < .001) while indices of the severity of the disease did not predict ME in COPD.
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An important performance determinant in wheelchair sports is the power exchanged between the athletewheelchair combination and the environment, in short, mechanical power. Inertial measurement units (IMUs) might be used to estimate the exchanged mechanical power during wheelchair sports practice. However, to validly apply IMUs for mechanical power assessment in wheelchair sports, a well-founded and unambiguous theoretical framework is required that follows the dynamics of manual wheelchair propulsion. Therefore, this research has two goals. First, to present a theoretical framework that supports the use of IMUs to estimate power output via power balance equations. Second, to demonstrate the use of the IMU-based power estimates during wheelchair propulsion based on experimental data. Mechanical power during straight-line wheelchair propulsion on a treadmill was estimated using a wheel mounted IMU and was subsequently compared to optical motion capture data serving as a reference. IMU-based power was calculated from rolling resistance (estimated from drag tests) and change in kinetic energy (estimated using wheelchair velocity and wheelchair acceleration). The results reveal no significant difference between reference power values and the proposed IMU-based power (1.8% mean difference, N.S.). As the estimated rolling resistance shows a 0.9–1.7% underestimation, over time, IMU-based power will be slightly underestimated as well. To conclude, the theoretical framework and the resulting IMU model seems to provide acceptable estimates of mechanical power during straight-line wheelchair propulsion in wheelchair (sports) practice, and it is an important first step towards feasible power estimations in all wheelchair sports situations.
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Energy efficiency has gained a lot of prominence in recent debates on urban sustainability and housing policy due to its potential consequences for climate change. At the local, national and also international level, there are numerous initiatives to promote energy savings and the use of renewable energy to reduce the environmental burden. There is a lot of literature on energy saving and other forms of energy efficiency in housing. However, how to bring this forward in the management of individual housing organisations is not often internationally explored. An international research project has been carried out to find the answers on management questions of housing organisations regarding energy efficiency. Eleven countries have been included in this study: Germany, the United Kingdom (more specifically: England), France, Sweden, Denmark, the Netherlands, Switzerland, Slovenia, the Czech Republic, Austria and Canada. The state of the art of energy efficiency in the housing management of non-profit housing organisations and the embedding of energy efficiency to improve the quality and performance of housing in management practices have been investigated, with a focus on how policy ambitions about energy efficiency are brought forward in investment decisions at the estate level. This paper presents the conclusions of the research
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Electrification of transportation, communication, working and living continues worldwide. Televisions, telephones, servers are an important part of everyday life. These loads and most sustainable sources as well, have one thing in common: Direct Current. The Dutch research and educational programme ‘DC – road to its full potential’ studies the impact of feeding these appliances from a DC grid. An improvement in energy efficiency is expected, other benefits are unknown and practical considerations are needed to come to a proper comparison with an AC grid. This paper starts with a brief introduction of the programme and its first stages. These stages encompass firstly the commissioning, selection and implementation of a safe and user friendly testing facility, to compare performance of domestic appliances when powered with AC and DC. Secondly, the relationship between the DC-testing facility and existing modeling and simulation assignments is explained. Thirdly, first results are discussed in a broad sense. An improved energy efficiency of 3% to 5% is already demonstrated for domestic appliances. That opens up questions for the performance of a domestic DC system as a whole. The paper then ends with proposed minor changes in the programme and guidelines for future projects. These changes encompass further studying of domestic appliances for product-development purposes, leaving less means for new and costly high-power testing facilities. Possible gains are 1) material and component savings 2) simpler and cheaper exteriors 3) stable and safe in-house infrastructure 4) whilst combined with local sustainable generation. That is the road ahead. 10.1109/DUE.2014.6827758
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Before the start and during the first weeks of their first year, it has been observed by teachers that engineering students start with a high level of motivation, which often seems to decrease during the course of the first semesters. Such a decrease in motivation can be a main driver for students dropping out of University early. A qualitative research will be carried out to answer the main questions that have been raised within the engineering department of the Fontys University of Applied sciences: to what extent does a decrease in the motivation of first-year students exists, exactly when during the course of the first year does this decrease occur and what are the underlying reasons causing this decline in motivation? Gaining more insight in the motivation drop of students could result in modifications to the curriculum. The final objectives are reducing the dropout level of students in the first year and increasing the quality level of young propaedeutics. In [1] and [2] studies are carried out to measure student’s motivation constructs, which have been carried out for first year Engineering students. The authors describe a certain level of motivation drop for first year students at an Engineering University. In Geraedts 2010 [3] it is defined that Maslow rules for students can be seen as an element of a student’s perception onto his or hers education. Often it can be observed that in most cases undergraduates start their education as an unconscious insufficient competent student having a very limited view on the work arena and complexity of the engineering discipline. Quickly after the start of the education year this view develops into a more defined perception of what the content and complexity of the future work field is and what is expected of the student during his or hers education. It is hypothesised that this gain in insights of the student into the work field and the related expectations is a significant contributor to the decline of intrinsic motivation. In this paper the investigated hypothesis and possible other aspects that influence the motivation of students will be presented. Based on results, potential corrective and preventive measures will be defined and discussed. Corrective and predictive measures depend on the results of this study and could be aimed for instance at: 1) making adjustments to the content and/or structure of the first semester curriculum, 2) improving the support of students in making adaptations into a better learning strategy and 3) improve the information on-which students decide to start a mechanical engineering education. This paper will focus on the first year mechanical engineering students of the Fontys University of Applied Sciences. About 100 first year students will be questioned using predefined questionnaires and additionally 20 of them will be interviewed for validation. References [1] Brett D. Jones, Marie C. Paretti, Serge F. Hein, Tamarra W. Knott, An analysis of Motivation Constructs with first-Year Engineering students, Journal of Engineering Education; Oct 2010; 99, 4; Research Library pg. 319 [2] L. Benson, A Kirn, B. Morkos, CAREER: Student Motivation and Learning in Engineering, 120th ASEE annual conference & Exposition June 2013 [3] HGM Geraedts (2010) Innovative learning for innovation ISBN 978-90-5284-624-8 4751
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Modern manufacturing has to deal with global competition, in which customers have high purchasing power. Production efficiency and rapid response to customer demand are dominant conditions for enterprises to stay successful. Reconfigurable Manufacturing Systems (RMSs) are designed to have a modular architecture in both mechanical design and control system. The architecture enables change of the machine structure quickly, by adding and removing parts of the system, and by changing the corresponding software programming. It can handle short times to market. This paper presents an ‘Index-Method’ to monitor the reconfiguration of RMS. The method is able to categorise the reconfiguration and related development in seven stages. It focusses specifically on the Independence Axiom. The main goal is to find all relevant parameters to cause interactions, and to decouple them. The solution, aiming to be scientifically vigorous and practically applicable, was applied to a true case; the development of a manufacturing system for an inkjet print head for industrial applications. The realisation of the system required the development of new process technology. The index-method may be considered successful. It has the ability to structure the configuration process of RMSs. The method harmonises well with the industry known V-model.
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Designs for improving energy efficiency in historical buildings are tailor made. For initiators the flexible character of design processes raises uncertainty about why certain energy measures are (not) allowed. How is decision making in thedesign process organised? And what mechanisms influence tailor made designs? In this paper we present an integral design method for energy efficient restoration. Our theoretical background draws on two sources. Firstly, we follow design theory with distinct generic and specific designs. Secondly we use the ‘heritage-as-a-spatial-factor’ approach, where participants with different backgrounds focus on adding value to heritage. By applying the integral design method, we evaluate decision making processes and reflect on heritage approaches. We suggest how the integral design method can be improved andquestion the parallel existence of heritage approaches.
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This chapter explains in brief what is needed to achieve more sustainable manufacturing processes. It develops both aspects of sustainable, economic, and technical feasibility with most focus on the latter. Remanufacturing processes are described together with relevant factors that enhance their effectivity and efficiency. An overview is given of what kind of shopfloor innovations are required in the near future and some suggestions on how digital and other Industry 4.0 technologies could help to move toward circular manufacturing.
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Nowadays companies need higher educated engineers to develop their competences to enable them to innovate. This innovation competence is seen as a remedy for the minor profitable business they do during the financial crises. Innovation is an element to be developed on the one hand for big companies as well as for small-and-medium sized companies through Europe to overcome this crisis. The higher education can be seen as an institution where youngsters, coming from secondary schools, who choose to learn at higher education to realize their dream, what they like to become in the professional world. The tasks of the Universities of applied Sciences are to prepare these youngsters to become starting engineers doing their job well in the companies. Companies work for a market, trying to manufacture products which customers are willing to pay for. They ask competent employees helping achieving this goal. It is important these companies inform the Universities of applied Sciences in order to modify their educational program in such a way that the graduated engineers are learning the latest knowledge and techniques, which they need to know doing their job well. The Universities of applied Sciences of Oulu (Finland) and Fontys Eindhoven (The Netherlands) are working together to experience possibilities to qualify their students on innovation development in an international setting. In the so-called: ‘Invention Project’, students are motivated to find their own invention, to design it, to prepare this idea for prototyping and to really manufacture it. Organizing the project, special attention is given to communication protocol between students and also between teachers. Students have meetings on Thursday every week through Internet connection with the communication program OPTIMA, which is provided by the Oulu University. Not only the time difference between Finland and the Netherlands is an issue to be organized also effective protocols how to provide each other relevant information and also how to make in an effective way decisions are issues. In the paper the writers will present opinions of students, teachers and also companies in both regions of Oulu and Eindhoven on the effectiveness of this project reaching the goal students get more experienced to set up innovative projects in an international setting. The writers think this is an important and needed competence for nowadays young engineers to be able to create lucrative inventions for companies where they are going to work for. In the paper the writers also present the experiences of the supervising conditions during the project. The information found will lead to success-factors and do’s and don’ts for future projects with international collaboration.
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