937 research outputs found

    Rotary Position Sensors Comparative study of different rotary position sensors for electrical machines used in an hybrid electric vehicle application

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    Today, many projects about Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs) are in progress within the automotive industry. Fuel-efficiency and reduction of carbon dioxide emissions from vehicles are the main targets. This thesis is within in one of these projects that is called electric All Wheel Drive(eAWD) at BorgWarner TorqTransfer Systems AB. A key parameter to perform an accurate and efficient control of an electric machine is the position sensor. The sensor measures the angular position of the rotor shaft and there are several ways and techniques to do this. This thesis aims to compare different common position sensors and identify ”new” sensor techniques by performing a literature study, model and simulate sensors and test an electric machine with different sensors implemented. Various enhancement methods to improve the position information and prediction are also evaluated. The electric motor prototype used in the eAWD project has different position sensors implemented and these are simulated in Matlab/Simulink together with the system model of the electric machine and control system. Tests are also performed and compared to the simulation results. The results show on best performance when using the resolver as position sensor. The Hall-effect sensor can be improved with an observer, but the observer is not suitable for this specific type of Torque Vectoring (TV) application. The Hall-effect sensor has a speed dependent torque ripple that leads to harmonics at frequencies that relates to the speed of the unit which may causes problems, such as mechanical resonances in the system. There are several ”new” sensor techniques based on the theory of eddy-currents that may be of interest since they are said to be more optimized for EV and HEV applications

    RETAINING WAYS OF CO-CREATION

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    The design space of future mobility services is considered a wicked problem, as many stakeholders from the public and private sectors need to collaborate to create sustainable future services. Recent years have shown a growing interest in utilizing urban living labs (ULL) and similar quadruple helix approaches toward addressing wicked design challenges. However, when engaging in co-creation through living labs, many actors also see potential in adapting methodology and new ways-of-doing, to appropriate it and improve readiness for tackling other wicked challenges. The article draws upon a ULL initiative in the mobility service context to explore the main challenges for ULL partners to retain the ways-of-doing that develops in co-creation activities. Through our study, we identified that cocreation needs to be grounded in the known, to facilitate search and co-appropriation of the unknown as key for retaining ways-of-doing in ULL initiatives

    Predictors of success at a rural juvenile offender facility

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    Thesis (M.A.) University of Alaska Fairbanks, 2002Although risk factors contributing to failure in treatment of young offenders have been studied extensively, little is written about what effects success. This study on the latter takes advantage of data obtained at a local treatment facility. This study uses statistical strategies to compare 7 different variables from a set of archival data with the outcome variable, which is 'success in treatment'. The seven independent variables are ethnicity, age at entry to treatment, pre-release pass (PRP), days in treatment, FAS/FAE, sexual offender, and psychiatric diagnosis. This data has been accumulated by a clinician at the facility and offered to the investigator for the purpose of this project. The first stage of the analysis was to correlate all of the 7 variables with the outcome variable (success/no success). The variables with the strongest association were selected, and then correlated with each other. Variables shown to be correlated with success were further studied using a Logistic Regression analysis. The results of the statistical analysis showed that non-minority status was the only variable to be clearly associated with success

    Dancing in the Dark-Social Media Tactics in the News Industry

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    The news media ecosystem has expanded over the years leading up to today’s society to include advertisers, newspapers and other media houses, content producers, along with new players like social media platforms to together form a value packed mix of services for end-users to embrace. The shift from being a dominant platform owner concerning the printed paper, often with its own distribution network, presents the newspaper with many challenges when transforming into, or entering other platform owners’ ecosystems. While previous research has mainly focused on the newspaper industry’s development of strategies for embracing social media into their ecosystem, this study investigates newspaper workers’ social media usage for the purpose of attracting attention and generating value. The study of newspaper workers’ practices shows that, moving into digital platforms controlled by other dominant actors in the ecosystem, workers enact a tactical approach. Two tactics are identified: adaption and exploitation. The paper contributes with empirical insights into how newspaper workers develop practices to embrace social media that goes beyond previous research on social media strategy. We also apply the theory of everyday tactics developed by Michel de Certeau as a scaffold to theorize newspaper positioning in the rapidly changing news media landscape

    Changing Boundaries in Virtual (Open) Innovation Work

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    FACILITATING SOCIAL AND COGNITIVE TRANSLATION IN INNOVATION NETWORKS

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    In this paper we present a two year long interpretative case study based on a Living Lab project. The case study is used to in retrospect investigate cognitive and social translation in a doubly distributed innovation network. By identifying and empirically exemplify how translations occurred, we present insights of how to support cognitive and social translations in these kind of networks. Using the concepts from Yoo et al. (2009) we explore the research question: how can cognitive and social translation be supported in Living Labs? Based on the findings we conclude that Living Labs can support heterogeneous set of actors and knowledge resources by supporting cognitive translation with techniques such as scenarios, mock-ups and prototypes. By working with an iterative process the involved actors can be supported to materialize prior and new knowledge which can be translated between different communities of actors. By setting up and providing a common ground a trading zone can be established supporting the social translations within the network by offering a space where negotiation of interests and alignment of perspectives can be facilitated

    Retinofugal pathways in the longnose gar Lepisosteus osseus (linnaeus)

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    Retinal projections were studied with autoradiographic and silver methods in the gar, Lepisosteus osseus , one of the two surviving members of the holostean actinopterygians. Contralaterally, the retina projects to the preoptic nucleus of the hypothalamus, and, via the medial optic tract, to the dorsal thalamus, medial ventral thalamic nucleus, nucleus pretectalis profundus pars ventralis and pars dorsalis, and the medial portion of the deep layer of the central zone in the optic tectum. The dorsal optic tract projects to the lateral ventral thalamic nucleus, nucleus pretectalis centralis, and the superficial white and gray zone of the optic tectum. The ventral optic tract terminates in the nucleus of the ventral optic tract, the lateral and medial ventral thalamic nuclei, nucleus pretectalis superficialis, nucleus pretectalis centralis, nucleus pretectalis profundus pars ventralis, the basal optic nucleus, and the superficial white and gray zone of the optic tectum. Ipsilateral projections are to similar sites, except for an absence of inputs to the lateral ventral thalamic nucleus from the dorsal tract and to the nucleus pretectalis superficialis, nucleus pretectalis profundus pars ventralis, and the basal optic nucleus from the ventral tract. The presence of ipsilateral retinal projections in gars is compared to their presumed absence in teleosts, and comparisons of retino-recipient targets in gars are made with teleosts and with non-actinopterygian vertebrates.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49996/1/901660102_ftp.pd

    TAILORING CO-CREATION FOR RESPONSIBLE INNOVATION: A DESIGN ETHNOGRAPHIC APPROACH

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    It is hard to predict the impact of technology on society before it is developed enough. For example, the issue can be attributed to the need for more cross-sectoral collaboration in the design process. However, a solution for anticipating such outcomes has been proposed through the quadruple helix innovation model, which states that the involvement of government, academia, industry, and the public is essential in innovation systems. The question of how this collaboration can successfully be staged to foresee possible impacts is an empirical endeavour. This paper presents an iterative case study of how ethnographic material can be used to ongoingly tailor speculative co-creation to facilitate responsible innovation (RI) principles. The result is reflected through two lenses; the tools developed in the project to facilitate co-creation activities and the stakeholder reflections evoked through these tools

    Observations on the brain of the coelacanth Latimeria chalumnae : External anatomy and quantitative analysis

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    New data on the brain of Latimeria indicate that previous estimates of the brain weight were too high by a factor of two. Our data suggest a brain weight of 1.1-1.5 grams for a specimen with a body weight of 30 kilograms. Quantitative data on major divisions of the brain are presented for the first time, and the relative size of the major brain divisions is similar to that of sturgeons and generalized sharks (such as hexanchids and squalids). Examination of brain component weight (s): body weight plots in a sample of non-teleost actinopterygian fishes indicates that all major divisions of the brain, except the telencephalon, are larger than in Latimeria. Brain component sizes in Latimeria are more similar to those extrapolated for amphibian brains than to those for actinopterygians. However, the cerebellum of Latimeria is considerably larger than that of amphibians.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/50270/1/1051550205_ftp.pd
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