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Kong, Lingyuan. "Coupled belt-pulley mechanics in serpentine belt drives." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1069789616.
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Lioy, Gerald T. "Optimization of an elastic drive belt system using an algorithm of automated optimal design /." Online version of thesis, 1985. http://hdl.handle.net/1850/9042.
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Tabatabaei, Lofty Seyed Mohammad. "Mechanical performance of v-ribbed belt drives." Thesis, University of Leeds, 1996. http://etheses.whiterose.ac.uk/21092/.
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The design and shape of a v-ribbed belt affects its radial movement in the pulley grooves. When rib bottom/ groove tip contact occurs the wedge action decreases. The beginning of the contact depends on belt tension, fit between rib and groove, wear and material properties. For the first time a non-contact laser displacement meter has been used for dynamic measurements of the radial movement of a v-ribbed belt (type 3PK) around the arc of wrap running on a belt testing rig. Accurate and repeatable results are possible. By the help of this device, the radial movement and the beginning of the rib bottom/groove tip contact around the arc of wrap have been determined experimentally for tested v-ribbed belts. This point plays an important role in the mechanical performance of v-ribbed belt drives. Two sizes of standard pulleys were used for mechanical testing. These were paired with nominal effective diameters, de =45 mm and de =80 mm. Tests were carried out at the speed of c.o =2000 RPM and two different values of total belt tensions (F, + F,) for three different types of rib bottom/groove tip contact. (i) Without contact (ii) With contact (iii) Mixed contact. Slip, torque loss and maximum torque capacity have been measured experimentally during the tests. A v-ribbed belt is assumed to be a combination of a flat belt and a v-belt with the same radial movement of the two parts. Based on these assumptions a new theory is developed for the mechanical performance of v-ribbed belt drives, which gives a new modification to Euler's equation (capstan formula). By the help of Maple V (mathematical standard library software) numerical solutions for theoretical modelling give the variation of non-dimensional values of v-ribbed belt tension, flat belt part of v-ribbed belt tension, v-belt part of v-ribbed belt tension, radial movement and sliding angle with the length of active arc. This theory has been developed to obtain expressions for speed loss (slip) in linear and non-linear zones. The experimental and theoretical results show that the radial movement and slip of the v-ribbed belt with rib bottom I groove tip contact is slightly less than the values without contact. However, in spite of more or less apparent similar performance of v-ribbed belt with and without rib bottom contact, it is found experimentally and theoretically that the compressed rubber of the belt (between cord and pulley) is subjected to a variable internal shear force around the pulley after contact.
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Kim, Dooroo. "Dynamic modeling of belt drives using the elastic/perfectly-plastic friction law." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29637.
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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2010.Committee Chair: Leamy, Michael; Committee Member: Costello, Mark; Committee Member: Ferri, Aldo. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Matson, Gary. "Computer aided design of multiple pulley timing belt drives /." Online version of thesis, 1988. http://hdl.handle.net/1850/10411.
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Chowdhury, Sanjib. "Effect of Shaft Vibration on the Dynamics of Gear and Belt Drives." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1267990279.
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Parker, Ian Kenneth. "Synchronous belt mechanics and life prediction : a fundamental investigation into the mechanics of toothed belts for automotive camshaft drives, and the prediction of belt life in operation." Thesis, University of Bradford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294351.
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ter, Beek Marc [Verfasser]. "Active control of coupled vibrations in belt drives for power transmission / Marc ter Beek." Aachen : Shaker, 2016. http://d-nb.info/1138177970/34.
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Beek, Marc ter [Verfasser]. "Active control of coupled vibrations in belt drives for power transmission / Marc ter Beek." Aachen : Shaker, 2016. http://nbn-resolving.de/urn:nbn:de:101:1-201708132190.
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Zhu, Farong. "Nonlinear dynamics of one-way clutches and dry friction tensioners in belt-pulley systems." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1158689667.
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Dalgarno, Kenneth W. "Synchronous belt materials : durability and performance." Thesis, University of Bradford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303850.
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McCandless, John Gregory. "Design of a belt-driven continuously variable transmission." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12147.
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Mariappan, Dhanushkodi D. 1979. "Dynamics of belt-driven servomechanisms : theory and experiments." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89904.
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Zhang, Lixin. "Dynamic analysis of viscoelastic serpentine belt drive systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0021/NQ45747.pdf.
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Posner, George. "Do Seat Belt Laws Drive Up Insurance Premiums?" Scholarship @ Claremont, 2012. http://scholarship.claremont.edu/cmc_theses/423.
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If you have to wear a seat belt when you drive, are you safer? Intuitively, it may seem that the answer is yes. After all, if you are wearing a seat belt and get in an accident, you are half as likely to die, and 62% of fatal accident victims were not wearing seat belts at the time of accident. The Centers for Disease Control and Prevention, the National Highway and Transportation Safety Administration, the Governors' Highway Safety Administration, and many other organizations highly recommend wearing seat belts. The NHTSA claims that in 2010 alone, approximately 12,500 deaths were prevented by seat belt use alone. Seat belt laws clearly reduce the chance of death to vehicle occupants in a given auto accident.
In response to these findings, the federal government has made the release of highway funds to states contingent on the passage of state laws mandating seat belt adoption. Laws mandating seat belt use, along with extensive campaigns to raise public awareness, have caused seat belt use to rise from 69% in 1998 to 88% in 2009. As of this writing, laws mandating the use of seat belts when driving have been passed in every state save New Hampshire. Intuitively, this should make roads safer because seat belts make an accident more survivable.
Does wearing a seat belt, however, make that accident more likely to occur in the first place? If a driver wears a seat belt now and I didn't before, does he feel safe enough to take more risk? In this paper, I examine this question using insurance premiums as a proxy for the likelihood of an accident. The rest of the paper is organized as follows. Section 2 offers background information, including a framework with which to interpret a driver’s actions and a review of the relevant literature. Section 3 contains details on the data analyzed. Section 4 covers the results of my preliminary data analysis, model specifications, and robustness checks. Section 5 concludes.
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Berry, Thomas Davis. "Experimental analysis of specific auditory-light safety belt reminder systems and safety belt behavior: "prods" or "prompts"." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43833.
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Safety belt reminder systems are ubiquitously present in most, if not alI automobiles sold in the United
States. Past research has found that the effectiveness of these reminder systems have shown minimal social benefit in the effort to increase safety belt use. The current investigation was conducted to determine if modified reminder systems could improve safety belt use. This research used an electronically equipped research vehicle sponsored by General Motors Corporation. The vehicle's research equipment allowed for the manipulation of different auditory reminder stimuli (i.e., chime, buzzer, and voice), temporal factors (e.g., presentation delays and second reminders) I and the measurement of the driver's safety belt use. Three modifications were explored: the presentation of a Delayed Reminder, Second Reminder, and comparisons of different auditory stimuli. The vehicle
also permitted a single subject repeated measure design and methodology that provided process analysis.
The results showed that the Delayed Reminder appeared ineffective at increasing belt use, whereas the Second Reminder was found to increase two out of nine subjects' safety belt response rates. The differential effects between the three auditory stimuli (i.e., Chime, Buzzer, & Voice) were inconclusive, though for two subjects the Buzzer and Voice were associated with safety belt increases.Master of Science
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Berg, Kathrine, and Elinor Petersson. "Seat belt and headrest adjustment: Increasing truck driver comfortability." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-216380.
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Truck drivers spend long, consecutive periods of time seated down, and the truck cab becomes their immediate work environment. Therefore, it is important to make sure that this space is properly adapted to fit the driver’s needs well. The driver seat is something the driver are very much in contact with. The seat can be adjusted in many ways to accommodate for drivers of different heights and body types. However, two of the components which are fixed today are the upper seat belt anchorage position and the headrest. In this thesis project, the aim has been to investigate the adjustment possibilities of these components in terms of desired adjustment range and mechanical solutions. The first part of the project was spent on ergonomic evaluations of the seat, and finding what properties are the most important when designing a truck seat. Both literature reviews as well as interviews and observations helped build the knowledge foundation to base adjustment concepts on. For example, it was found that to minimise the negative effects of sedentary work, the single most important action is to frequently change the sitting position. Therefore, it is of high importance that adjustment procedures are as simple as possible. It was also found that many truck drivers do not use their seat belt at all, and that having a headrest which is adjustable in height is important for the driver’s visual area. Several ideas and concepts were generated and evaluated. The initial ideas included both solutions applicable on the current seat belt design, while some would use other means of securing the driver in a collision. The ideas were compared and evaluated, and three were chosen to develop further; one being easy to implement, and two being mechanical solutions both making use of the current seat belt design. These three concepts were investigated more deeply, and were subsequently also compared using different methods for evaluation. Eventually, a final concept was chosen; a mechanical solution in which the seat belt and headrest can be adjusted separately in one and two directions respectively. This concept was further developed in terms of both mechanical as well as visual design. In the final concept, Hoop, the seat belt is adjusted sideways, as this was proven to give the largest comfortability improvement for the driver. The headrest is adjustable in both height and depth. The mechanisms are locked using ratchets, however, both can be adjusted in what is believed to be the most critical direction without the need to unlock first. The buttons for unlocking the mechanisms are placed directly on the adjustment mechanisms in order to keep the procedure as intuitive and easy to use as possible. The adjustment ranges were determined based on Scania’s anthropometric dataset in order to make sure that the adjustment features will be useful for an as large part of the driver population as possible.Lastbilschaufförer tillbringar under sina arbetspass många timmar i lastbilshytten, som blir deras direkta arbetsmiljö. Det är därför viktigt att hytten är utformad utifrån föraren och dennes behov. Förarstolen är en av de komponenter som föraren har allra mest kontakt med. Denna kan justeras på många sätt för att möjliggöra för förare av olika längder och kroppstyper att hitta en körposition som passar just dem. Två komponenter som dock inte kan justeras i dagsläget är positionen av den övre bältesomlänkaren och nackstödet. I detta examensarbete har fokus varit att ta fram hur justering för dessa skulle kunna se ut både i form av önskat justerområde och mekaniska lösningar. Projektets inleddes med en ergonomisk undersökning för att hitta de viktigaste fokusområdena för just lastbilars förarstolar. Informationen hämtades dels från litteratur, och utöver detta gjordes även användarundersökningar genom en enkät, kontextuella intervjuer och observationer. En av de viktigaste insikterna från undersökningen var att det absolut viktigaste för att undvika negativa effekter av stillasittande arbete är att kontinuerligt ändra sin sittposition. Ett effektivt sätt att få fler förare att använda justeringsfunktionerna på detta sätt kan vara att placera kontroller väl åtkomliga och göra justeringsproceduren så lättförståelig och lättanvänd som möjligt. Dessutom är det mycket viktigt att ett nackstöd kan justeras inte bara ur komfortsynpunkt, utan här finns det även en stark säkerhetsfaktor kopplad till förarens synfält. Baserat på informationssökningen genererades därefter flera olika lösningsidéer, där vissa låg närmre dagens lösning än andra. Dessa evaluerades sedan med hjälp av bland annat beslutsmatriser, och tre idéer valdes att utveckla vidare till tydligare koncept. Av de tre idéer som valts ut var en lösning enkel att implementera och två var olika mekaniska lösningar, alla applicerbara för den nuvarande bältesformen. Dessa detaljerades och kombinerades samman med hjälp av en morfologisk matris, och jämfördes sedan gentemot varandra. Slutligen valdes ett koncept ut som det slutgiltiga, där bältesomlänkaren kan justeras i en riktning och nackstödet i två. Detta slutkoncept utvecklades ytterligare vad gäller den mekaniska lösningen och dess visuella form. I slutkonceptet, Hoop, kan bältesomlänkaren justeras i sidled, eftersom denna justeringsriktning i den ergonomiska undersökningen visade sig ge störst resultat för förarens komfort. Nackstödet kan justeras både i höjd- och i djupled. Båda mekanismerna låses med hjälp av geometriska spärrlåsningar, men kan justeras i en riktning, den som ses som mest kritisk att snabbt kunna justera i, utan att föraren först behöver låsa upp mekanismen. Knapparna för att låsa upp mekanismerna är placerade i direkt anslutning till området där själva rörelsen sker för att göra användandet så intuitivt som möjligt. Justerområdena har baserats på antropometriska mått hämtade från Scaniafamiljen för att försäkra om att de täcker in så stor del av förarpopulationen som möjligt.
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Fernandes, Ralston Psychology Faculty of Science UNSW. "A systematic investigation of relevant predictors, moderations and mediations for intention to speed, drink-drive, drive while fatigued, and not wear a seat belt, amongst young NSW drivers." Publisher:University of New South Wales. Psychology, 2007. http://handle.unsw.edu.au/1959.4/42933.
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Road trauma is recognized as a major public health problem worldwide (particularly for younger drivers), and risky driving has been identified as an important contributor to road crashes. It is often assumed that similar factors influence all risky driving behaviours, although direct and systematic examination of the differences between risky driving behaviours in terms of precipitating factors is lacking. The present thesis sought to undertake a systematic investigation of relevant factors in the prediction of four key risky driving behaviours (speeding, drink-driving, driving while fatigued, and not wearing seat belts). Four versions of a Risky Driving Questionnaire were developed to assess beliefs, personality factors and behavioural intentions, in relation to each of the four behaviours. Four versions of the Implicit Association Test were developed to assess attitudes toward each of the four behaviours, without reliance on self-report (in terms of the relative strength of pairs of associations). Data were collected from a student sample (N=215: Study 1), as well as urban (N=587) and rural (N=422) general population samples (Study 2), and regression models were examined for each of the four behaviours, with interaction terms to assess moderations involving perceived risk. Mediations involving gender were also assessed. Results indicate that different risky driving behaviours are predicted by different factors. For example, in the urban sample, speeding was predicted by driver anger and illusory invulnerability, drink driving was predicted by peer influence, driving while fatigued was predicted by the perceived benefits of not driving while fatigued, and not wearing seat belts was predicted by the (sensation seeking x illusory invulnerability) interaction. Results also suggest that different predictors of risky driving behaviours are relevant for different driver populations. For example, speeding was predicted by authority rebellion in the urban sample, and by sensation seeking in the rural sample. Observed moderations of perceived risk suggest that relationships between perceived risk and risky driving may differ for males versus females, and for low versus high sensation seekers. Findings suggest that future road safety interventions should be based on research of the determinants of individual risky driving behaviours, and in specific driver populations.
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Alwazae, Meshari. "Template-driven Documentation of Best Practices." Doctoral thesis, Stockholms universitet, Institutionen för data- och systemvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-121625.
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Knowledge Management has become a key instrument for identifying, creating and sharing organizational knowledge assets. An attractive means for sharing knowledge is Best Practices (BPs), which are proven as well as efficient and effective solutions to recurring problems. BPs can offer significant benefits, including improved performance, reduced re-work and cost savings. However, it is challenging to share and use BP Documents (BPDs) in organizations, which is the overall problem addressed in this thesis. More precisely, the thesis focuses on two sub-problems: 1) The difficulty of finding and selecting appropriate BPs in large collections of BPs impedes the use of BPs, and 2) The low quality of BPDs impedes the use of BPs. Related to these problems, the thesis addresses two sub-goals. The first one is to design a BP Annotation Template for supporting the identification and selection of BPs in BP repositories. The template can be used for organizing and indexing the contents of BPDs independent of domain. The second sub-goal is to design a BP Document Template for supporting the creation, use and evaluation of BP documentation. The BP Document Template offers a structure for describing BPs in a detailed and systematic way. The research methodology applied is design science, which is the scientific study and creation of artifacts as they are developed and used by people with the goal of solving practical problems. The first artifact, the BP Annotation Template, has been designed and developed based on a literature study and evaluated using expert interviews. The second artifact, the BP Document Template, has been designed and developed based on a literature study using grounded theory as well as on interviews with KM experts. The BP Document Template has been evaluated using expert interviews and demonstrated by being applied in three real-life cases. By basing the two artifacts on literature studies, the two artifacts consolidate, integrate and extend previous work on BP documentation. The evaluations indicate that the BP Annotation Template provides a strong foundation for identifying and selecting BPs, independent of domain, and that the BP Document Template can support the structuring of BP documents so that they become complete, uniform and easy-to-use. An identified drawback of the two artifacts is the need for extensive resources for implementing and applying them since they may be complex and time-consuming to use. The artifacts are expected to support BP designers as well as BP managers and BP users.
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Yang, Xuedong. "Modeling and control of two-axis belt-drive gantry robots." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/13061.
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Курочкін, Валерій Борисович, Валерий Борисович Курочкин, Valerii Borysovych Kurochkin, В. Ю. Кондусь, and И. С. Примак. "Особенности расчета ресурса ременных передач." Thesis, Издательство СумГУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25839.
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Masaki, Mukalu Sandro. "A cost-effective design approach for multiple drive belt conveyor systems." Diss., University of Pretoria, 2005. http://hdl.handle.net/2263/66217.
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Multiple drive belt conveyors are being increasingly incorporated in mining plans worldwide because of their high economic performance and the ease of moving these installations around, especially in underground mines. A typical modern multi-drive conveyor system consists of one or more intermediate drive stations positioned along the upper stretch of the conveyor and a single drive station situated in the lower stretch. Despite the acknowledged cost saving potential of the multiple drive technology, no previous work was reported on the methodology to realize a cost-effective design of multi-drive belt conveyors. This study investigates a design approach for multiple drive belt conveyors with the objective to achieve the lowest life cycle cost of multi-drive belt conveyors for a specified material transport task. For this purpose, an optimization model for the cost-effective design of multi-drive conveyor systems is formulated on the basis of the recommendations of the DIN 22101 and SANS 1313 standards. For a given number of intermediate drive stations, the proposed model optimizes a set of design parameters so that the minimum equivalent annual cost of a conveyor can be attained whilst handling the transport requirements and design conditions. The conveyor parameters optimized in this study are the rated powers of motors, the rated torques of gear reducers, the diameters and wrap angles of drive pulleys, the belt width, the belt speed, the lengths of the belt sections not nestled between drive pulleys, the spacings between idler rolls and the shell diameters and shaft diameters of idler rolls. For benchmark analysis purposes, a similar optimization model is also developed for the single drive technology. Described as mixed integer nonlinear programming (MINLP) problems, the two optimization models are solved using the MIDACO solver embedded in the MATLAB environment. The results of this study show the validity and effectiveness of the design model proposed for multi-drive belt conveyors. The results also indicate that the multiple drive technology is more beneficial for the conveying over long distances. The impact of the possible instability of inflation throughout the project lifetime is also investigated through three hypothetical scenarios, which involve a fixed inflation rate, a higher fluctuating inflation rate and a lower fluctuating inflation rate, respectively. The results of this sensitivity analysis show that the most cost-effective multi-drive belt conveyors obtained under a fixed inflation rate is robust enough against limited fluctuations of this parameter.Dissertation (MEng)--University of Pretoria, 2017.
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
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Rutherford, Robert Chad. "A design methodology for control of a belt-driven robot using frequency response analysis." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19072.
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Pakhotin, Ivan. "Fusion of first principles driven and system science approaches to advance radiation belt forecasting." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/7260/.
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Modern radiation belt models can be broadly split into either physics-driven diffusion based algorithms, or data science techniques that utilise the continuous data coverage from satellites at geostationary orbit and the Lagrange point L1 to apply statistical data analysis methods to predict electron fluxes at geostationary orbit. The first kind, while posessing generality due to their physical nature, lack accuracy compared to their data-driven counterparts. This is because the magnetosphere is a highly complex system that is not easy to model and its dynamics are not yet fully understood. Meanwhile, data-driven methods possess statistical accuracy, but cannot predict outside their operating parameters, and so on their own provide no information about what happens in the wider radiation belt region. This thesis is devoted to the development of a model that combines the two approaches into one unified system, attempting to combine the predictive range of physical modelling with the accuracy of the data-driven approach. This model uses geosynchronous orbit fluxes predicted using an advanced data science technique as an input to drive a physics-based radiation belt modelling code. The model has been developed and tested for a range of energy channels, magnetospheric conditions, and with various modifications. It was validated using data from NASA's recent Van Allen probes mission and with NOAA's GOES-13 geostationary satellite. The model results are in good agreement with observations, with the sources of inaccuracies explored in the manuscript. This work is a first attempt to create such a model, and potential improvements are outlined that should further increase accuracy. A further modification of the model is explored that is found to provide superior performance at geostationary orbit at the cost of degraded performance elsewhere. It is proposed to use this modification in tandem with the main model, where accurate information about geostationary orbit is required. The modification has been tested on long-duration time periods and was found to generate good predictions for high-energy electron fluxes. The role of electromagnetic ion cyclotron (EMIC) waves is explored using wave vector analysis and calculation of minimum resonant energies. The aim is to identify what effect EMIC waves have on electron dynamics at energies below 1 MeV. The conclusions are that EMIC waves, under certain conditions, do affect these electron populations in the magnetosphere, and their effect should be included in a representative radiation belt model. This is suggested as a further improvement to the simulation.
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Farrell, Leah. "The A.R.K. Project: A Grassroots, Student-Led, Multiple-Component Intervention to Increase Driver Safety-Belt Use on a University Campus." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/31395.
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This study represents a collaborative effort among university academics and community stakeholders. Virginia Techâ s (VT) Center for Applied Behavior Systems (CABS) teamed up with student groups following the death of a fellow student to create The A.R.K. Project. This multiple-component intervention study specifically targeted students on the VT campus, in an attempt to increase driver safety-belt use. Observations on VT studentsâ safety-belt use and other safety-related behaviors (i.e., turn-signal use and cell-phone use) were made during pre-intervention, intervention, post-intervention, and follow-up study phases and compared with observations made on drivers in two non-equivalent control groups (VT faculty/staff and Radford University (RU) students).
Evaluation of the project revealed no meaningful changes in daily percentages of VT student safety-belt use, when compared to that of non-equivalent control groups. Percentages by phase did vary in the hypothesized direction for VT students. Percentages by phase varied in similar ways for VT faculty/staff, suggesting the student-targeted intervention, over-all, was not responsible for the observed changes. However, one inter-personal intervention component, the Buckle-Up Flashcards prompt was associated with a particularly successful rate of compliance. Thirty percent of un-buckled drivers complied with this inter-personal response.
Because VT student safety-belt use did not change as a function of the intervention, it was irrelevant to investigate response generalization to other safety-related behaviors. Instead, the author focused on covariation between safety-belt use, turn-signal use, and cell-phone use. Buckled drivers were significantly more likely to indicate turns with a turn signal and were significantly less likely to use cell phones. Other additional findings of epidemiologic importance were that safety-belt use was significantly more likely among VT faculty/staff than VT students and safety-belt use was significantly more likely among VT faculty/staff and VT student females than among VT faculty/staff and VT student males. Interpretations of these findings and directions for future research are discussed.Master of Science
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Swanno, TinaMarie. "Socialization variables related to non-usage of seat belts by 16-24 year olds." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/swannot/tinamarieswanno.pdf.
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Martins, Diego Rodrigo 1987. "Análise dinâmica não linear de sistema de transmissão por correia." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265212.
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Orientador: Robson PederivaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-23T14:08:15Z (GMT). No. of bitstreams: 1 Martins_DiegoRodrigo_M.pdf: 7219918 bytes, checksum: 31c54119f27719f2488e9ea8f2a0126e (MD5) Previous issue date: 2013
Resumo: O presente trabalho tem por objeto o estudo de sistemas de transmissão por correia serpentina com tensionador automático, que é uma aplicação automotiva utilizada em larga escala e cujo comportamento dinâmico apresenta grande influência sobre o funcionamento dos acessórios acionados pelo motor. O movimento do eixo de manivelas acionado pelo processo de combustão apresenta como característica a ocorrência de variações de velocidade e torque entregues aos acessórios pelo sistema de transmissão, contudo as flutuações de torque resultantes deste movimento são o principal mecanismo excitador do sistema de transmissão por correia. Níveis elevados de flutuação de torque podem aumentar o nível de tração dinâmica atuante na correia, fazendo com que esta venha a falhar devido à fadiga, ou produzir níveis de vibração torcional elevados nas polias dos acessórios, causando impacto direto em seus suportes. Através de modelos matemáticos é avaliado o comportamento do sistema de transmissão, considerando alguns fenômenos responsáveis por introduzir não linearidades neste. São avaliados, assim, os efeitos de tração inicial, frequências naturais, formas modais e respostas temporais do sistema. Paralelamente é estudado o comportamento de um sistema de transmissão real através da uma investigação experimental. São identificados seus parâmetros lineares através de técnicas de Análise Modal, bem como efeitos de variação destes parâmetros em função da velocidade de operação do sistema. É avaliada a composição em frequência da resposta do sistema quando em operação e também são realizados testes para detecção de não linearidades no sistema
Abstract: The objective of the present work is the study of a tensioner loaded belt drive system, which is a recurrent automotive application used in large scale and whose dynamic behavior has great influence on the functioning of various components powered by engine. Crankshaft motion, powered by internal combustion process, presents as characteristic the occurrence of variations on speed and torque delivered to accessory by belt drive, torque fluctuation due to this motion is the main excitation mechanism to belt drive systems though. High levels of torque fluctuation can increase belt dynamic tension making it amenable to fault due to fatigue or produce high levels of torsional vibration on accessory pulleys which has direct impact on its support structure. By means of mathematical models, systems behavior is evaluated, taking into account phenomena responsible for introducing nonlinearities. Initial tractive tension, natural frequencies, modeshapes and time responses of the system are evaluated. In parallel, it is studied the behavior of a real belt drive system through experimental investigation. Linear parameters are identified by Experimental Modal Analysis techniques, and its variation as function of system operating speed, as well. Frequency composition of system's response are evaluated and also are performed tests to detect nonlinearities
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
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Dripps, Holly. "The Beat Stops Here: A Nurse-Driven Protocol to Manage Telemetry Orders." Otterbein University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=otbn1587679616511666.
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Jones, Brince Robert. "Redesigning Police Beat Zone Placement to Improve 911 Response Time: A Data Driven Approach." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248520/.
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Research suggests that using data driven solutions in policing strategies improves the quality of service provided by the police department. Unfortunately, many police departments, including the Denton Police Department, do not use their spatial data to inform beat zone placement. Analysis of the current beat zone configuration found that there are disparities in the workload, as measured by number of calls for service, between beat zones. Further, there was also a statistically significant difference between the median response times across all the five beat zones in Denton. This means that the median response time varies depending on where the call for service originates. Using readily available data, these police departments can apply methods such as UPAS to improve the quality of service provided by the department. UPAS is a deterministic algorithm that produces a given number of contiguous spatial partitions of approximately equal population size; in this case, calls for service are substituted for population. Although this algorithm was originally developed to create solutions for bio-terrorism response planning, it has been applied to the problem of creating beat zones of roughly equal workload in this research. I have shown that this algorithm results in a beat zone configuration that significantly reduces the difference in workload between the busiest and least busy beat zone (~94% reduction). Assuming an equal distribution of resources across beat zones, having approximately similar workloads should lead to fewer disparities in quality of service.
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Alharbi, Fawaz Ali. "Evaluation of Relationship of Seat Belt Use Between Front Seat Passengers and Their Drivers in Dayton, Ohio." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1404829225.
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Kliš, Kamil. "Pohon pásového dopravníku pro transport uhlí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230456.
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This diploma thesis deals with designing a drivetrain for a coal belt conveyor. Thesis contains necessary calculations according to norms needed for determining suitable components of a belt conveyor. The goal of this diploma thesis was to design a drivetrain for a belt conveyor, all its components including a frame of the drivetrain and to create drawing documentation.
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Weekes, Alix M. "Systems for the automotive industry for improved safety of pregnant occupants." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6374.
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The thesis presents an investigation of pregnant women s safety and comfort needs during car travel. A survey is used to investigate all aspects and problems of car travel. This survey is a comprehensive examination of the entire driving activity with much detail of reported difficulties from pregnant women that forms a novel resource for the automotive engineers. The survey results are used to generate guidelines for the automotive industry. A series of sled tests are presented that investigate seat belt use in pregnancy including the use of lap belt positioners. The peak abdominal pressure results clearly agree with current guidelines that the lap belt should be positioned across the hips and not across the abdomen. This research includes a novel anthropometric dataset for 107 pregnant women including measurements especially selected for the field of automotive design and to describe the changes of pregnancy. This includes investigation of pregnant driver s proximity to the steering wheel. A novel measurement of knee splay is used to define the pregnant women s preference to sit with their knees widely spaced instead of knees together, in both normal sitting and in a car. Comparison is made between the pregnant women's measurements and the available data in the literature for non-pregnant women and males, and this shows that pregnant women can be excluded from designs if the accommodation does not consider their needs. The pregnant women's anthropometric data is presented as a novel website in order to make the data available to the automotive industry. This website is generated for use by automotive engineers and is designed to suit their usability needs and the general trends within the industry, in order to make the site more user-friendly and more likely to be used as a reference for pregnant occupant's needs.
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Yang, Xiaodong. "Tectonics of fold-thrust belts driven by plate convergence and gravitational instability." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/427035/.
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Fold-thrust belts (FTBs) related to plate convergence are found in active margins and in the foreland of orogenic belts, while those related to gravitational failure are typically found on passive margins. Seismic imaging of the subsurface structure, combined with decades of study and analysis, have resulted in a good first-pass understanding of their tectonics and mechanics, but there are still many significant unresolved issues. Numerical models were used to investigate aspects of thrust belt growth: the interplay between the overall wedge taper, width and height, deformation front, internal movement, and fault position, activity, displacement and dip. After a new thrust initiates at the wedge front, the entire wedge shortens and thickens to re- attain critical taper, with significant frontal thrust activity and minor activity on older thrusts. Models show that thrust belts grow cyclically, with periods of accretion (rapid thrust-front advance, high displacement and strain rate), and periods of adjustment (slow wedge deformation, low displacement and strain rate). Detailed observation of the zone in front of the thrust front indicates that deformation in that region is a critical component of system advance. New area balancing methods, involving evaluation of the role of the regional slope, have been developed to improve the accuracy of structural restoration and shortening quantification. Application to analogue models and natural fold-thrust belts highlights the importance of regional slope in area balancing restoration: a higher regional dip results in reduced shortening while a lower regional dip leads to increased shortening. Accuracy of the shortening estimate requires independent constraint of parameters, particularly the initial regional slope. The tectonics of the Northwest Borneo Fold-Thrust Belt (NBFB), offshore Brunei, are investigated using 3D seismic data. The NBFB contains three fold types: fault-propagation folds (dominant); detachment folds (minor); and fault-bend folds (rare). For each fold, structural style varies along strike, in response to changes in the magnitude of folding, basal décollement strength, and inherited structure and basement topography. Fault spacing responds to basement topography and topography also blocks forward propagation of the fold-thrust belt. Fault dip increases as the fault and fold matures. The low taper angle (mostly < 6) implies a high basal fluid pressure (>0.7 of lithostatic pressure). Evidence of two distinct stages of fault (fold) activity, wide distribution of active contractional deformation across the entire belt (rather than just at the toe), and present-day extensional inactivity, suggest that the NBFB results from a combination of primary gravitational tectonics and secondary plate convergence. Fold-thrust belts caused by plate convergence are compared with gravity-driven systems. The energy source in gravity-driven systems is the release of gravitational potential energy within the sediment pile, producing upslope extension and downslope contraction. This is resupplied by sedimentation. Episodic sediment input leads to fluctuations in deformation rate. In contrast, the energy source of convergence driven systems is movement of a stressed lithosphere-scale boundary. Plate movement is continuous, so thrust belt deformation is less episodic. Back-thrusts and fault back rotation are more common in convergence-driven systems and landward-vergent thrusts can be present. The rate of shortening across convergence-driven systems is high and generally continuous on a long time scale. Whereas rates are lower across the contractional domain of a gravity-driven system and more variable through time. A plate-driven system is limited by plate motion rate, i.e. the rate at which the plate is fed into the FTB, whereas a gravity driven system is resisted by the strength of the sediments and detachment.
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LaPierre, Jeffrey A. "A novel tension-member follower train for a generic cam-driven mechanism." Worcester, Mass. Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-061308-160839/.
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Nordlöf, Tomas, and Sandra Tegman. "Probably the best thesis in the world : En fallstudie gjord hos Carlsberg angående de problem som kan uppstå i en nedbrytning från strategin till operationella nyckeltal." Thesis, Umeå universitet, Handelshögskolan vid Umeå universitet, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-49344.
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Denna uppsats har frågeställningen: Vilka problem kan uppstå vid en nedbrytning från strategin till operationella nyckeltal och vad kan göras för att undvika dem?Syftet med denna studie är att undersöka hur en nedbrytning av strategin till operationella nyckeltal går till. Framtagningen av nyckeltal ska leda till en identifiering av vilka problem som kan uppstå i denna nedbrytning samt förslag på hur de kan undvikas. Studien ska även ha till syfte att designa nyckeltal som underlättar för en uppföljning och för att besvara vad personalen ska göra för att förbättra talet, det vill säga en kommunikation nedifrån och upp och vice versa. För att genomföra denna studie har empirisk data hämtats från Carlsberg Sverige AB (CSAB) där den operationella leveransplaneringsavdelningen idag står utan nyckeltal.
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Ford, Emily E., Kathryn L. Duvall, David L. Wood, and Kiana R. Johnson. "Taking the Risk: Insufficient Communication Concerning Risky Driving Behaviors Among Young Drivers in Central Appalachia." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/asrf/2018/schedule/91.
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Introduction: This study moves to examine the prevalence of risky driving behaviors and deficiency of communication pertinent to topics related to safe driving among adolescents in central Appalachia. Even though plenty of research displays the consequences associated with driving, drivers continue to take part in risky behaviors such as texting while driving, riding in a vehicle without wearing a seatbelt, and riding in a vehicle with someone who has been drinking. Methods: Participants of the study included three high schools in Southwest Virginia consisting of 385 11th and 12th grade students. Students were administered a paper-pencil survey either during homeroom or last period with questions taken from the Youth Risk Behavior Surveillance Survey. Results: The results of the study indicate the frequent occurrence of young drivers engaging in risky driving behaviors associated with texting while driving and not wearing a seatbelt as both passenger and driver in a vehicle. Additionally, the results of the study indicate that there is a lack of healthcare provider communication related to risks associated with driving. This information is crucial because the data demonstrates the missed opportunity to provide better education to adolescents on how they can prevent harm to their lives or the lives of other citizens while driving. Conclusion: After analyzing these results, it becomes evident that more education about safe driving behaviors is crucial for benefiting the young drivers of this region. Because road injury is the leading cause of death among adolescents, it is paramount to provide educational resources to young drivers to decrease the impact of injuries and deaths related to risky driving behaviors. There resides a missed opportunity to educate adolescents about behaviors that may risk their lives or those of their peers and loved ones. In addition, researchers can conduct further studies to examine effective safe driving education programs to decrease the risk behaviors commonly engaged in by adolescent drivers.
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Silva, Carlos Alexandre Ferreira Da. "Modeling and optimization of power losses in poly-V belt transmissions : Application to the Front Engine Accessory Drive of trucks." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI079/document.
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Ces travaux s’inscrivent dans le cadre du projet EDIT(Efficient Distribution Truck, FUI19), piloté par le groupe Volvo Trucks, dont l’objectif de réduction de consommation pour 2020 est fixé à 13% par rapport à un véhicule actuel EURO-6. Le projet EDIT porte sur cinq axes techniques d’amélioration dont un consiste en l’obtention d’un système optimisé de transmission par courroie poly-V au regard des pertes de puissance. Actuellement les faces avant de moteur sont perfectionnées sur le plan mécanique ; cela signifie que la durée de vie de ses composants est optimisée, et que les nuisances vibratoires sont réduites. Par contre, des améliorations peuvent être apportées sur le plan énergétique. Cette thèse, qui a pour objectif d’investiguer les possibilités de réduction et d’optimisation des pertes de puissance sur les façades accessoires, se décline en trois parties : une caractérisation par l’analyse mécanique dynamique des matériaux viscoélastiques des courroies poly-V et des composantes de façade ; une modélisation, une optimisation et une implémentation logicielle des modèles de pertes de puissance ; validées par une dernière partie expérimentale sur banc d’essais. Les pertes de puissances dans une face avant moteur sont de plusieurs types : des pertes internes à la courroie poly-V (hystérésis du caoutchouc), des pertes externes à la courroie (glissement poulie/courroie) et des pertes internes aux composants (frottement dans les roulements). Ces pertes peuvent désormais être quantifiées et optimisées grâce aux modèles développés durant cette thèse. Ces modèles ont été validés et implémentés dans un outil de simulation (PLFead, Power Loss Front engine accessory drive), qui a été développé pour optimiser les pertes de puissance en tenant compte des paramètres de design et de fonctionnement des faces avant moteurThis work is a part of the Efficient Distribution Truck (EDIT, FUI 19) project, led by Volvo Trucks, whose objective is to reduce distribution vehicles’ fuel consumption for 2020 by 13% when compared with the current production vehicle EURO-6. The EDIT project targets five areas of research and technical solutions, one of which consists of obtaining an optimized poly-V belt transmission concerning the power losses. In terms of lifetime of the mechanical components, reduction of noise and vibrations, the Front Engine Accessory Drives (FEADs) are currently one of the most technologically sophisticated systems. However, further improvements can be made to make the vehicles more energy efficient. This thesis, which aims at investigating possibilities for reducing and optimizing the power losses in the FEADs, is composed of three main parts: the characterization of the viscoelastic materials of the poly-V belts via Dynamic Mechanical Analysis (DMA) and the FEAD components; the modeling, the optimization and the implementation of the power loss models in a simulation tool; and their experimental validation through a test bench. The power losses occurring in a FEAD are of several types: poly-V internal losses (hysteresis of the belt-rubber), poly-V external losses (belt/pulley slip) and losses from the accessory drives (friction inside the bearings). These power losses can be quantified and optimized thanks to the models developed throughout this thesis. These models have been validated and implemented in a simulation tool (PLFead, Power Loss Front engine accessory drive), which has been developed to optimize the power losses taking into consideration the design parameters and operating conditions of the FEAD
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Åkerlund, Ulrika. "The Best of Both Worlds : Aspirations, Drivers and Practices of Swedish Lifestyle Movers in Malta." Doctoral thesis, Umeå universitet, Kulturgeografi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-82972.
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It has often been claimed that contemporary societies are shaped by globalization; the rapid interconnections of societies, economies, markets, flows and information potentially linking all places in the world to each other. In search for experiences, variation, escape or comfort, individuals are travelling, circulating, and migrating between places, challenging the notions of ‘home’ and ‘away’, ‘everyday’ and ‘extraordinary’. This thesis addresses the ways lifestyle-led mobilities are produced and performed, by studying the mobility trajectories and experiences of Swedes dividing their time seasonally between Sweden and Malta. It explores how movers are faced with a structural framework that both facilitates and directs their choices concerning mobility, and how they interpret and respond to these structures. It also explores the imaginaries, meanings, and feelings for place, identity, and lifestyle that the movers negotiate through their mobility practices and through the links they create and sustain in places. Thus, this thesis is situated in an evolving field of research on lifestyle mobilities. Lifestyle mobilities are here defined as those mobility practices undertaken by individuals based on their freedom of choice, of a temporal or more permanent duration, with or without any significant ‘home base(s)’, that are primarily driven by aspirations to increase ‘quality of life’, and that are primarily related to the individuals’ lifestyle values. The thesis is based on four individual papers exploring different aspects lifestyle mobility. The aim is to understand how production and performance aspects of lifestyle mobilities are related, and how notions of identity and belonging are negotiated in relation to lifestyle mobility practices. The production aspect relates to those structures and frameworks that create, facilitate, or sometimes delimit opportunities for lifestyle mobility while the performance aspect focuses on individual agency and meaning of lifestyle mobility practices. The studies are based on in-depth interviews with Swedish movers in Malta, and focus on how structural frameworks and mediations influence the ways that movers manoeuvre, manipulate or adapt to structures and influences in order to arrange their life context to achieve ‘quality of life’. A second aim focuses on the ways that movers reflect upon their identities and belongings as they travel routinely between two (or more) significant places, and how this may influence mobility practices. It is concluded that structures and mediations are both facilitating and delimiting movers’ space of choice regarding mobility decisions. Through their agency, movers negotiate their space of choice by allocating resources and experience, accessing supportive networks and tailoring their access to entitlements. The production and performance aspects of lifestyle mobility practices are interlinked in complex ways.
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Bergström, Jonas, and Andreas Dahlqvist. "BESMART : a framework for shifting from BESpoke to MARkeT-driven requirements engineering." Thesis, Blekinge Tekniska Högskola, Avdelningen för programvarusystem, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1308.
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Requirements Engineering has two main directions, Bespoke (product developed for one customer) and Market-Driven (several potential customers for the same product). These two are in some ways very much alike but in some aspects very different. Over the last couple of years the software development industry has tended to shift more and more to Market-Driven Requirements Engineering. This has brought attention to the challenges facing a Market-Driven development organization, without focusing on the actual shift from Bespoke development. Based on the differences and similarities between Bespoke and Market-Driven Requirements Engineering, this thesis presents a framework for shifting from the former to the latter. The framework (BESMART) involves three steps. Firstly, the organization assesses their potential to become more Market-Driven. Secondly they assess their current way of working to identify which areas that may need to be improved. Finally, BESMART provides multiple suggestions that address the identified improvement areas. The organization is then able to choose the one that best suits their needs. This also lets the organization choose a solution that they find feasible. The framework was used at a case organization during its development. This way it was ensured that the theoretical framework could actually be used in a real world setting. The practical use of BESMART resulted in some refinements aimed at making it more applicable in industry. Once the framework had been applied, it was evaluated by representatives from the case organization. The industry evaluation resulted in some improvement suggestions but showed that the framework was both useful and usable and provided an improvement plan that seemed promising enough to pilot in the organization.
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Rotimbo, Mbourou Donald Romarick. "Contribution à la surveillance et au diagnostic de défauts dans les systèmes de transmission par courroie." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES052.
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Dans cette thèse, nous nous proposons d’investiguer les signaux expérimentaux provenant des transmissions par courroie, afin d’envisager par exemple le diagnostic de la tension. N’étant pas issu du domaine de la Mécanique, nous présentons donc une bibliographie exhaustive et thématique sur la théorie et l’expérimentation dans les systèmes transmissions par courroie. Le résumé de ce travail a permis de choisir une approche de modélisation mécanique correspondant au mieux aux conditions réelles de fonctionnement de notre système. Elle inclut les variations temporelles dans la vitesse de rotation du moteur qui entraîne la transmission entière et des changements dans la tension de la courroie. Malheureusement, nous n’avons pas réussi à implémenter numériquement les équations de simulation. Néanmoins, les conclusions que nous en tirons nous aident par la suite à mieux comprendre et interpréter les résultats expérimentaux obtenus, après application de l’ensemble des procédures de Traitement du signal. Notre panoplie d’outils de traitements numériques est tirée d’une longue analyse comparative des différents algorithmes de Traitement du Signal existants, dédiés à la surveillance, au diagnostic et au pronostic des défaillances observées sur les roulements et les engrenages. Nous les avons réadaptés pour convenir à l'étude des paramètres variables (tension, charge et/ou vitesse) qui peuvent apparaître dans les transmissions par courroie. Le principal intérêt de notre travail est le développement d’une procédure automatisée et efficace, permettant un suivi fiable des défaillances, dans les domaines d’analyses : modale, traditionnelle (temporelle, fréquentielle, spectrale), synchrone, temps-fréquence et surtout « cyclostationnaire » . Dans ce dernier domaine, avec des méthodes d’extraction de sources à partir d’un signal préalablement rééchantillonné, nous étudions spécifiquement les composantes périodique et aléatoire. Chaque type de défaut (variations au niveau de la tension, la charge et/ou la vitesse) a une signature que nous cherchons à distinguer avec des indicateurs de condition(temporels, fréquentiels et spectraux). Nous essayons de comparer les résultats expérimentaux à la théorie sur les transmissions par courroie. Grâce aux méthodes et algorithmes développés dans ce travail de thèse, nous apportons une contribution permettant de traiter un certain nombre de problèmes inhérents aux transmissions par courroies, à partir de leurs signaux expérimentaux acquis sur des accéléromètres, des jauges de contraintes et des codeurs optiquesIn this PHD, we investigate experimental signals recorded from belt drives with a diagnosis aim of belt tension. Our research works present an exhaustive and thematic bibliography on theory and experimentation in belt drive to complete our insufficient knowledges in mechanical domain. We choosed a theoritical approach nearest real conditions of our belt drives bench. We included time fluctuaction in drive shaft speed and blet changes. Unfortunately, we could not resolve motion equations because existence of numerical limits. All conclusions will be used to understand and interprate experimental results after our signal processing numerical procedures. Our tools panel of numerical process comes from a comparative analysis extracted in several scientific documents and differents algorithms. They dedicate to surveillance, diagnosis and pronostic oriented toward bear and gear defaults. A adaptation in our belt case is necessary with variables parameters (tension, load and/or speed) affecting our case. In our automatic approach, we study several faults in analysis domains : modal, traditionnal (time, frequency, spectrum), synchronous, time-frequency and « cyclostationary » . In this last domain, we extract both comopnent (discret and random), after an previous resmapling operation applying to raw collected signal. Each falut type has a specific signature to discriminate with pertinent condition indications (time, frequency and spectrum domains). All results are discussed at the end of this PHD document. Our developped methods and algorithms are a contribution to process belt drives problems, from exprerimental signals recording with acceleromertes, constraint gauges and optical coders
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Dolinay, Jiří. "Návrh stroje pro odizolování plochých kabelů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230632.
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The subject of this diploma thesis is especially design of main conception of one purpose machine for outinsulating of flat cables. Designed solution must implement basic requirements of outinsulating‘s quality. Part of this thesis includes also technical-economics evaluation of choosed solution and analysis of risks.
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Rice, Sasha M. "Value Driven: An Analysis of Attitudes and Values Via BET Programming Past and Present." CSUSB ScholarWorks, 2015. https://scholarworks.lib.csusb.edu/etd/135.
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This paper explores the general attitudes of African Americans towards the programming disseminated on the BET network past and present (pre-Viacom/post-Viacom). The mass media company Viacom acquired BET from African American founder Robert L. Johnson in 1980. BET under Johnson took pride in its ability to provide sophisticated, value-driven, and positive programming for African Americans. This study looks to see if the cultural values at BET have changed via its programming since Viacom’s purchase. This study utilized social media to survey 100 participants who were born prior to 1984 who identify as African American or mixed African American and are familiar with BET. This paper uses social identity theory to examine the attitudes that the African American participants hold towards BET as they use their value-set to negotiate their social identity via their attitudes with the content shown on BET. This research reveals the importance of viewing cultures as heterogeneous as well as the importance of cultural groups such as African Americans controlling the dissemination of their own cultural messages and images. A paired T-test analysis revealed statistically a significant difference of participant attitudes of BET in the past (1980-1999) and the present (2000-2015). The participants therefore rated BET higher on the average in the past when BET was black owned (pre-Viacom), as opposed to the present now that BET is white owned (post-Viacom).
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Serrano, Berthet Rodrigo. "Who knows what's best for the poor? : demand-driven policies and rural poverty in northeast Brazil." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/26877.
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Hugosson, Conny, Omer Kayani, and Mark Krieg. "Customer focused development of a variable bent-axis pump/motor for open circuit hydrostatic transmissions, e.g. in hydraulic hybrid drives." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200062.
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The paper presents the development methodology of a hydrostatic pump/motor for use in Parker Hannifin’s advanced series hydraulic hybrid transmissions for medium and heavy duty commercial vehicles. With Parker’s established bent-axis pump/motor technology for heavy duty mobile applications as a basis, it describes the main stages of further development and qualification for demanding automotive main drive transmissions. Parker’s APQP based, customer focused product development model was employed for this development which resulted in the variable bent-axis pump/motor C24 for open circuit hydrostatic transmissions. Positive customer results from a large fleet of in-service refuse collection trucks and parcel delivery vans with Parker advanced hydraulic hybrid drive systems using C24 pumps/motors serve as evidence of Parker’s product development model effectiveness.
High reliability, good fuel economy, increased productivity and long brake life of the vehicles can directly be traced back to the streamlined, front-loaded and iterative development model.
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Cambrook, Helen Elizabeth. "Investigating the role of T-bet in CD4+ T cell driven central nervous system autoimmunity." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/17608.
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Self-reactive CD4+ helper T cells (Th) are key causal agents in the pathogenesis of many autoimmune diseases. Experimental autoimmune encephalomyelitis (EAE) is a CD4+T cell model of the demyelinating autoimmune disease multiple sclerosis (MS). It has been shown that EAE is caused by CD4+ T-cells that produce pro-inflammatory cytokines IFN-γ (Th1) and IL-17 (Th17). As such, understanding how these Th cells are generated and controlled is essential. There is debate as to whether Th1 and Th17 cells act independently in EAE or if there is plasticity between these two subtypes, and whether the capacity to switch from Th1 to Th17 confers pathogenic capacity. T-bet was first described as the master transcription factor for Th1 cells, and is thought to have a critical role in EAE even though IFN-γ, the Th1 archetypal cytokine, has been shown to be redundant. More recent work has shown that T-bet is expressed in multiple immune cell types, and it remains unclear in what cells the expression of T-bet is required for EAE. Considerable efforts have been put into understanding the role of T-bet in EAE pathogenesis, with a view to modulate cells expressing T-bet for therapy. The hypothesis of this work was that T-bet has multifaceted roles in EAE, in initiating and directing an immune response in innate antigen presenting cells such as dendritic cells (DC) as well as programming pathogenic effector CD4+ T cell (Teff) response to antigen. T-bet-/- mice were studied using different models of EAE to dissect the role of T-bet in disease pathogenesis. Active immunisation of C57BL/6 mice with the immunodominant peptide from myelin oligodendrocyte glycoprotein (MOG35-55) showed that T-bet-/- mice developed EAE with an IL-17 dominated profile and critically, T-bet-/- mice were able to produce GM-CSF which has recently been described as a key cytokine for EAE. T-bet-/- cells were not able to transfer EAE in a model of passive transfer EAE, where CD4+ T cells were polarised towards a Th1 profile in vitro. Illustrating that T-bet is required in CD4+ T cells for Th1 mediated EAE. DC driven EAE showed that T-bet-/- DC were able to activate CD4+ T cells in vitro and cause EAE upon co-transfer into host mice with transgenic CD4+ T cells. Thus, it has been shown that T-bet is not required in EAE. This work represents a step further towards understanding the disease mechanisms involved in EAE and suggests T-bet is not an appropriate therapeutic target for the treatment of MS.
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Langer, Peter. "Bestimmung der Übertragungsgüte von Riementrieben." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-163556.
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Der zentrale Antrieb von Maschinen erfolgt häufig über einen Riementrieb, da eine Drehzahlanpassung einfach und kostengünstig zu realisieren ist. Für Maschinen mit hohen verarbeitungstechnischen Forderungen hinsichtlich der Qualität, z.B. zerspanende Werkzeugmaschinen oder Druckmaschinen, ist oftmals die Übertragungsgüte des Riementriebes der begrenzende Faktor für Leistungssteigerungen oder Qualitätsverbesserungen. Aus der Übertragungsgüte des Riementriebes resultieren dynamische Kräfte/ Momente, die als dynamischer Erreger in der Maschine wirken. Um den Einfluss der Übertragungsgüte eines Riementriebes zu verstehen, ist das dynamische Verhalten der gesamten Maschine notwendig zu betrachten. Dies wird kurz am Beispiel einer Druckmaschine erläutert. Grundvoraussetzung zur Verbesserung der Übertragungsgüte eines Riementriebes ist eine wiederholbare messtechnische Bestimmung der Übertragungsgüte. Die in der KBA genutzte und dazu entwickelte Methodik wird vorgestellt. Aus der messtechnischen Untersuchung zur Übertragungsgüte werden Frequenzbereichssowie Zeitbereichsergebnisse für die untersuchten Poly-V-Riemen präsentiert und interpretiert. Die ermittelten Abhängigkeiten, die vom Riemen selbst resultieren, sowie aus dem Zusammenwirken aller Bauteile eines Riementriebes beruhen, werden diskutiert. Die vorgestellte Methodik zur Bestimmung der Riemengüte ist nicht auf die Untersuchung von Poly-V-Riemen oder Riementrieben beschränkt und kann für alle gleichförmig übersetzenden Getriebe genutzt werden. Die Methodik ermöglicht nachfolgend eine extrem präzise Bestimmung der ÜbertragungsgüteThe main drive of a machine is usually transferred through a belt drive as adjustments to speed can be carried out easily and cost effectively. The transmission quality of a belt drive is often a limiting factor when improving performance or quality for machines with technologically high finishing demands regarding quality, e.g. drilling and milling machines or printing presses. Dynamic forces/moments, which work as dynamic exciters in a machine, result from the transmission quality. In order to understand the influence of a belt drive’s transmission quality it is necessary to look at the dynamic behavior of an entire machine. This will be briefly explained using a printing press as an example. A repeatable metrological determination of the transmission quality is key to improving a belt drive’s transmission quality. The method developed and used at KBA will be presented in this article. The frequency range and time range results for the tested poly-V-belts from this metrological study on transmission quality will be presented and interpreted. Identified dependencies which result from the belts as well as the collective effect of all the components in a belt drive will be discussed in this article. The frequency range and time range results for the tested poly-V-belts from this metrological study on transmission quality will be presented and interpreted. Identified dependencies which result from the belts as well as the collective effect of all the components in a belt drive will be discussed in this article. The method presented for determining belt quality is not just limited to inspecting poly-V-belts or belt drives, it can be used for all uniform transmission gears. It allows transmission quality to be determined extremely precisely
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Naccarato, Alexa. "Data Literacy: How Developing Best Practices for Higher Education in Communications Will Drive Innovation in Tomorrow's Workplace." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42733.
Full textAbstract:
Data literacy has become one of the most important competencies for a citizen to exercise in their personal and professional lives. It contributes to more informed decision-making in all aspects of life, and is more frequently being utilized in organizations to drive innovation and change. These skills are especially important for communications professionals, as interpreting and communicating data to various publics is the foundation of information sharing in virtually every industry and sector. Data competencies are typically acquired in post-secondary education; however, existing curricula are lacking robustness, adaptability, and transferability of skills needed in the workplace and in our ever-changing world. Through the results collected from both professors and practitioners in the communications field, this study identifies the gaps in existing curricula, and justifies the importance of communications students acquiring data literacy skills to ensure that they will be equipped for their careers and the world at large. This research highlights that improving data and research skills will better prepare citizens for their professional and personal lives.
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Sumser, Anton [Verfasser], and Bert [Akademischer Betreuer] Sakmann. "Structure and dynamics of the corticothalamic driver pathway in the mouse whisker system / Anton Sumser ; Betreuer: Bert Sakmann." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2016. http://d-nb.info/1117474186/34.
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Oakes, Eileen. "What drives us to give of our best? : an appreciative inquiry into how educational psychologists support early years children and their families." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/what-drives-us-to-give-of-our-best--an-appreciative-inquiry-into-how-educational-psychologists-support-early-years-children-and-their-families(1f5fe7a3-c521-412e-8763-f2db6693e04b).html.
Full textAbstract:
The aim of this study was to ensure that the Sefton Educational Psychology and Portage Service (SEPPS) maintained a high quality service to very young children, their families and settings while responding to the national changes in Children’s Services prompted by Every Child Matters (ECM) (DfES, 2003) and changes in team structure and personnel at a local level. The methodology used was based on the appreciative inquiry (AI) 4-D cycle described by Coghlan, Preskill and Catsambas, (2003) and consisted of four phases which were implemented over a period of eighteen months: Discovery, Dream, Design and Destiny. During the Discovery phase of the project, three educational psychologists (EPs) provided rich narratives illustrating what drives them to work with very young children, families and settings and the contribution that they think EPs make to this area of work. Individual EP’s views of their own skills were corroborated by interviews with parents and analysis of all seven parental stories confirmed that the service that they received met the EPs’ expectations of best practice. In Phase Two, (Discovery/Dream) a workshop was held with representatives of the EP team’s other early years stakeholders to introduce them to AI and to elicit their perceptions of best practice in partnership working. The findings from the inquiry were then used to inform the work of the team during the period from April 2009 to February 2010 (Design/Destiny). Progress was tracked both formally and informally. At the end of the Destiny phase, the stakeholders involved in Phase Two of the project were interviewed to gather evidence on whether they had been able to apply AI in their own work and whether they had noticed any differences in the early years’ work of EPs since attending the initial workshop. The data collected by the author and other members of the EP team (who acted as co-researchers) included interview transcripts, worksheets, flipcharts, reflection/evaluation sheets and minutes of meetings. Each of these elements was analysed individually and collectively by the author according to the principles of thematic analysis, as described by Attride-Stirling (2001), Carter (2004) and Braun and Clarke (2006).At the end of the project, some of the stakeholders interviewed reported that the AI workshop had transformed their way of working from a deficit model to a strengths based model. There was also evidence that attendance at the workshop had changed participants’ perceptions of the role of the EP, facilitating improved channels of communication and the development of a shared vision. Each member of the early years EP team was mentioned in at least one positive story, indicating that high standards of service delivery were maintained during a period of considerable change. The extent to which AI contributed to this process and the challenges presented by this methodology are also discussed.
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Pokorný, Prokop. "Pohon pojezdu výsuvové hlavy pásového dopravníku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231756.
Full textAbstract:
This master's thesis makes a brief comparison of design variants of belt conveyors with variable length including examples of use. The thesis is also deals with design of travel drive of movable head, witch is a part of propel station of belt conveyor for long distance belt conveyor systems. The thesis perform static analysis of steel structure of movable head. This thesis can serve as guidance for handling similar projects. Contains basic drawings of movable head steel structure and components of the movable head travel drive.