Дисертації з теми "Physical quality of speed"
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1
Harvey, Scott A. "Low-speed wind tunnel flow quality determination." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5584.
Повний текст джерелаАнотація:
Approved for public release; distribution is unlimited.lected points. Incorporated instrumentation includes pressure transducers attached to a pitot-static tube, wall static pressure taps, and a pressure rake; a hotwire anemometry system, and a linear traverse system. These were integrated with a data acquisition (DAQ) processor with analog to digital conversion and digital I/O boards, and controlled using in-house developed LabVIEW software. Testing showed a maximum axial velocity of 38 m/s, which is 84% of the tunnel?s rated speed. The 2-D flow uniformity was within ±7% by pressure rake, and ±3% with a turbulence intensity ?0.11% at full speed using a CTA, affirming the tunnel?s viability as a demonstration platform. Spectral density plots in the boundary layer exhibit typical behavior of fully developed equilibrium turbulent flow with an intertial sub-range present. Future testing of a flat-plate wake for drag modification is planned.
2
Bertram, Stacie C. Hines Edward R. "Quality in physical therapy education." Normal, Ill. Illinois State University, 2001. http://wwwlib.umi.com/cr/ilstu/fullcit?p3064478.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--Illinois State University, 2001.Title from title page screen, viewed April 13, 2006. Dissertation Committee: Edward R. Hines [Chair], James Palmer, William Tolone, Phyllis McCluskey-Titus, Mary Jo Mays. Includes bibliographical references (leaves 135-143) and abstract. Also available in print.
3
Toots, Annika. "Gait speed and physical exercise in people with dementia." Doctoral thesis, Umeå universitet, Fysioterapi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-128733.
Повний текст джерелаАнотація:
The aim of the thesis was to investigate the importance of physical function for survival in very old people, and furthermore, whether physical exercise could influence physical function, cognitive function, and dependence in activities of daily living (ADLs) in older people with dementia living in nursing homes. The world’s population is ageing. Given the age-related increase in chronic disease such as dementia and compounded by physical inactivity, the prevalence in need for assistance and are in daily activities in older people is expected to increase in the near future. Gait speed, a measure of physical function, has been shown to be associated with health and survival. However, studies of the oldest people in the population, including those dependent in ADLs, living in nursing homes and with dementia, are few. Moreover, in people with dementia physical exercise may improve physical and cognitive function and reduce dependence in ADLs. Further large studies with high methodological quality and with designs incorporating attention control groups are needed in this population. In addition, no study has compared exercise effects between dementia types. The association between gait speed and survival was investigated in a population based cohort study of 772 people aged 85 years and over. Usual gait speed was assessed over 2.4 metres and mortality followed for five years. Cox proportional hazard regression models adjusted for potential confounders were used in analyses. Effects of physical exercise in people with dementia were investigated in a randomised controlled trial that included 186 participants with various dementia types living in nursing homes. Participants were allocated to the High-Intensity Functional Exercise (HIFE) program or a seated control activity, which both lasted 45 minutes and held five times fortnightly for four months. Dependence in ADLs was assessed with Functional Independence Measure and Barthel ADL Index, and balance with Berg Balance Scale. Usual gait speed was evaluated over 4.0 metres in two tests; first using habitual walking aid if any, and thereafter without walking aid and with minimum living support. Global cognitive function was assessed using the Mini-Mental State Examination, the Alzheimer’s Disease Assessment Scale-Cognitive subscale, and executive function using Verbal fluency. Blinded testers performed assessments at baseline, four (directly after intervention completion) and seven months. Analyses used linear mixed models in agreement with the intention-to-treat principle. Gait speed was found to be an independent predictor of five-year all-cause mortality, where inability to complete the gait test or a gait speed below 0.5 iv meters per second (m/s) was associated with higher mortality risk. In analyses of exercise effects on ADLs there was no difference between groups in the complete sample. Interaction analyses showed a difference in exercise effect according to dementia type at seven months. Positive between-group exercise effects were found for dependence in ADLs in participants with non-Alzheimer’s type of dementia (non-AD) at four and seven months. In balance, a difference between groups was found at four but not at seven months in the complete sample, and interaction analyses indicated a difference in effect according to dementia type at four and seven months. Positive between-group exercise effects were found in participants with non-AD. No difference between groups in gait speed was found in the complete sample, where the majority habitually walked with a walking aid. In interaction analyses exercise effects differed according to walking aid use. Positive between-group exercise effects in gait speed were found in participants that walked unsupported at four and seven months. No difference between groups in cognitive function was found in the complete sample. The effects of exercise on gait speed and cognitive function did not differ according to sex, cognitive level, or dementia type. In conclusion, among people aged 85 or older, including those dependent in ADLs and with dementia, gait speed seems to be a useful clinical indicator of health status. Inability to complete the gait test or a gait speed below 0.5 m/s appears to be associated with higher five-year mortality risk. In older people with mild to moderate dementia living in nursing homes, a four-month high-intensity functional exercise program appeared to attenuate loss of dependence in ADLs and improve balance, albeit only in participants with non-AD type of dementia. Further studies are needed to validate this result. Furthermore, exercise had positive effects on gait speed when tested unsupported, in contrast to when walking aids or minimum support were used. The result implies that the use of walking aids in the gait speed test may conceal exercise effects. The exercise program had no superior effects on global cognition or executive function when compared with an attention control activity. This thesis suggests that, in older people with dementia, exercise effects on physical function rather than cognitive function may explain effects on dependence in ADLs.
4
Afshar, A. F. S. "Design of novel cells to simulate high speed electrodeposition." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/6940.
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5
Wood, David John Dudley. "Some aspects of the high-speed electrodeposition of metals." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/25905.
Повний текст джерелаАнотація:
The literature concerning the fast electrodeposition of metals has been reviewed with particular attention to the electrodeposition of nickel. A study of the electrodeposition of nickel has been carried out in concentrated Ni sulphamate solutions at 50-70°C in parallel plate cells at Reynolds numbers of up to 15,000. The cell design was substantiated by a preliminary study of the electrodeposition of copper. Additional studies have been made of current distribution in both the nickel and acid copper systems using segmented electrodes. Additional studies of mass transport have been made in the nickel system, as have polarisation studies. It has been shown that in the case of acid copper the system performs under mass transport control and that the current distribution is as expected under these conditions.
6
Zarari, Maria Prodromou. "Intermolecular forces from the speed of sound in gases." Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/8828.
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Chughtai, Mohsan Niaz. "Study of physical layer impairments in high speed optical networks." Licentiate thesis, KTH, Fotonik (Stängd 20120101), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94186.
Повний текст джерелаАнотація:
The work done in this thesis focuses on the impact of transmission impairments in high speed optical networks. Specifically it focuses on the impact of nonlinear impairments in long haul fiber optic data transmission. Currently deployed fiber optic transmission networks are running on NRZ OOK modulation formats with spectral efficiency of only 1 bit/symbol. To achieve spectral efficiency beyond 1 bit/symbol, fiber optic communication systems running on advanced modulation formats such as QPSK are becoming important candidates. The practical deployment of QPSK based fiber optic communication system is severely limited by Kerr-induced nonlinear distortions such as XPM and XPolM, from the neighboring NRZ OOK channels. In this thesis we focus on the impact of nonlinear impairments (XPM and XPolM) in fiber optical transmission systems running on QPSK modulation with both differential and coherent detection. The dependence of impact of nonlinear impairments on SOP, baud rate of the neighboring NRZ OOK channels and PMD in the fiber, is analyzed in detail through numerical simulations in VPItransmission Maker®. In this thesis we also analyze digital signal processing algorithms to compensate linear and nonlinear impairments in coherent fiber optic communication systems. We propose a simplification of the existing method for joint compensation of linear and nonlinear impairments called "digital back propagation". Our method is called "weighted digital back propagation". It achieves the same performance of conventional digital back propagation with up to 80% reduction in computational complexity.In the last part of the thesis we analyze the transmission performance of a newly proposed hybrid WDM/TDM protection scheme through numerical simulation in VPItransmission Maker®. The transmission performance of the hybrid WDM/TDM PON is limited by impairments from passive optical devices and fiber optical channel.QC 20120514
8
Lim, Hiam Hiok. "Intelligent quality of service algorithms for high speed networks." Monash University, School of Computer Science and Software Engineering, 2002. http://arrow.monash.edu.au/hdl/1959.1/8275.
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Rahman, Fahmida. "EVALUATE PROBE SPEED DATA QUALITY TO IMPROVE TRANSPORTATION MODELING." UKnowledge, 2019. https://uknowledge.uky.edu/ce_etds/80.
Повний текст джерелаАнотація:
Probe speed data are widely used to calculate performance measures for quantifying state-wide traffic conditions. Estimation of the accurate performance measures requires adequate speed data observations. However, probe vehicles reporting the speed data may not be available all the time on each road segment. Agencies need to develop a good understanding of the adequacy of these reported data before using them in different transportation applications. This study attempts to systematically assess the quality of the probe data by proposing a method, which determines the minimum sample rate for checking data adequacy. The minimum sample rate is defined as the minimum required speed data for a segment ensuring the speed estimates within a defined error range. The proposed method adopts a bootstrapping approach to determine the minimum sample rate within a pre-defined acceptance level. After applying the method to the speed data, the results from the analysis show a minimum sample rate of 10% for Kentucky’s roads. This cut-off value for Kentucky’s roads helps to identify the segments where the availability is greater than the minimum sample rate. This study also shows two applications of the minimum sample rates resulted from the bootstrapping. Firstly, the results are utilized to identify the geometric and operational factors that contribute to the minimum sample rate of a facility. Using random forests regression model as a tool, functional class, section length, and speed limit are found to be the significant variables for uninterrupted facility. Contrarily, for interrupted facility, signal density, section length, speed limit, and intersection density are the significant variables. Lastly, the speed data associated with the segments are applied to improve Free Flow Speed estimation by the traditional model.
10
Prasanna, Shreya. "The influence of music on movement speed in chronic pain." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86955.
Повний текст джерелаАнотація:
Movement slowing among individuals with fibromyalgia (FM) adds to the burden of the condition. Music is known to influence movement speed in healthy individuals and it is plausible that it can be used to counteract slow movements in individuals with FM. Study objectives were to estimate a) whether walking to music of different tempi alters the gait speed in individuals with FM; b) whether music alters the mood, pain intensity, pain affect and perceived exertion in these individuals. A single subject research design was used. Eight women with FM walked under two different music conditions (fast and slow music) and a control (no music) condition. Outcome measures included gait speed, pain intensity, affect, mood and perceived exertion. Results showed that four subjects walked faster with fast music. No change was noted in the clinical measures. Music may be useful to improve gait speed in people with FM.Le ralentissement du mouvement chez les personnes atteintes de fibromyalgie (FM) constitue un fardeau qui s'ajoute aux symptômes de cette maladie. Il est reconnu que la musique peut influencer la vitesse du mouvement chez les individus en bonne santé ; il est plausible qu'elle puisse aussi être utilisée pour contrecarrer le ralentissement des mouvements chez les individus atteints de FM. Les objectifs de cette étude consistaient à estimer a) si marcher en écoutant de la musique à différents tempi modifie la vitesse de marche chez les personnes atteintes de FM; b) si la musique modifie l'humeur, l'intensité de la douleur, l'émotion liée à la douleur et l'effort perçu par ces individus pendant leur marche. Une étude prospective à protocoles individuels (single subject research design) a été réalisée. Huit femmes atteintes de FM ont marché sous deux conditions musicalement différentes (musique lente ou rapide) et sous une condition contrôle (pas de musique). Les variables d'intérêts mesurées comprenaient la vitesse de marche, l'intensité de la douleur, l'émotion liée à la douleur, l'humeur et l'effort perçu. Les résultats ont montré que quatre sujets ont marché plus rapidement lorsqu'ils écoutaient la musique rapide. Aucun changement n'a été noté dans les mesures cliniques. Ces résultats indiquent que la musique pourrait être utilisée afin d'améliorer la vitesse de marche chez les personnes atteintes de FM.
11
Ferrer, Florit Albert. "Quality of service for high-speed interconnection networks onboard spacecraft." Thesis, University of Dundee, 2013. https://discovery.dundee.ac.uk/en/studentTheses/df7b00e3-04d7-4deb-81df-541cf8e0189a.
Повний текст джерелаАнотація:
State-of-the-art onboard spacecraft avionics use SpaceWire networks to interconnect payload data-handling sub-systems. This includes high data-rate sensors and instruments, processing units, and memory devices. SpaceWire is an interconnection network composed of nodes and routers connected by bi-directional, point-to-point, high-speed, serial-data communication links. SpaceWire is established as one of the main data-handling protocols and is being used on many ESA, NASA and JAXA spacecraft. SpaceWire is very successful for being fast, flexible and simple to use and implement. However it does not implement Quality of Service mechanisms, which aim to provide guarantees in terms of reliability and timely delivery to data generated by network clients. Quality of Service is increasingly being deployed in commercial ground technologies and its availability for space applications, which requires high reliability and performance, is of high interest for the space community. This thesis researches how Quality of Service can be provided to existing SpaceWire networks. Existing solutions for ground-based technologies cannot be directly used because of the constraints imposed by the limitations of space-qualified electronics. Due to these limitations SpaceWire uses wormhole routing which has many benefits but makes it more challenging to obtain timing guarantees and to achieve a deterministic behaviour. These challenges are addressed in this work with a careful analysis of existing Quality of Service techniques and the implementation of a novel set of protocols specifically designed for SpaceWire networks. These new protocols target specific use cases and utilise different mechanisms to achieve the required reliability, timely delivery and determinism. Traditional and novel techniques are deployed for first time in SpaceWire networks. In particular, segmentation, acknowledgements, retry, time-division multiplexing an cross-layer techniques are considered, analysed, implemented and evaluated with extensive prototyping efforts. SpaceWire provides high-rate data transfers but the next generation of payload instruments are going to require multi-gigabit capabilities. SpaceFibre is a new onboard networking technology under development which aims to satisfy these new requirements, keeping compatibility with SpaceWire user-applications. As a new standard, SpaceFibre offers the opportunity to implement Quality of Service techniques without the limitations imposed by the SpaceWire standard. The last part of this thesis focuses on the specification of the SpaceFibre standard in order to provide the Quality of Service required by next generation of space applications. This work includes analytical studies, software simulations, and hardware prototyping of new concepts which are the basis of the Quality of Service mechanisms defined in the new SpaceFibre standard. Therefore, a critical contribution is made to the definition and evaluation of a novel Quality of Service solution which provides high reliability, bandwidth reservation, priority and deterministic delivery to SpaceFibre links.
12
Heusel-Gillig, L., A. Nogi, and Courtney D. Hall. "Suggested Guidelines for Backwards Walking Speed: Scoring the Functional Gait Assessment." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/2709.
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13
Green, Robert James. "Advanced error management in high-speed communication networks." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368287.
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Eriksson, Gabriella. "On Physical Relations in Driving: Judgements, Cognition and Perception." Doctoral thesis, Stockholms universitet, Psykologiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-100762.
Повний текст джерелаАнотація:
Drivers need to make judgements of physical relationships related to driving speed, such as mean speed, risks, travel time and fuel consumption, in order to make optimal choices of vehicle speed. This is also the case for the general public, politicians and other stakeholders who are engaged in traffic issues. This thesis investigates how drivers’ judgements of travel time (Study I and II), fuel consumption (Study III) and mean speed (Study IV) relate to actual physical measures. A cognitive time-saving bias has been found in judgements of travel time. The time saving bias implies that people overestimate the time saved when increasing speed from a high speed and underestimate the time saved when increasing speed from a low speed. Previous studies have mainly investigated the bias from a cognitive perspective in questionnaires. In Study I the bias was shown to be present when participants were engaged in a driving simulator task where participants primarily rely on perceptual cues. Study II showed that intuitive time saving judgements can be debiased by presenting drivers with an alternative speedometer that indicate the inverted speed in minutes per kilometre. In Study III, judgements of fuel consumption at increasing and decreasing speeds were examined, and the results showed systematic deviations from correct measures. In particular, professional truck drivers underestimated the fuel saving effect of a decrease in speed. Study IV showed that subjective mean speed judgements differed from objective mean speeds and could predict route choice better than objective mean speeds. The results indicate that biases in these judgements are robust and that they predict behaviour. The thesis concludes that judgements of mean speeds, time savings and fuel consumption systematically deviate from physical measures. The results have implications for predicting travel behaviour and the design of driver feedback systems.Förare bör göra bedömningar som relaterar till hastighet, såsom bedömningar av medelhastighet, risk, restid och bränsleåtgång. Dessa bedömningar är nödvändiga för att föraren ska kunna välja en optimal hastighet, men också för att allmänheten, politiker och andra intressenter som är involverade i trafikfrågor ska kunna fatta välgrundade beslut. Denna avhandling består av fyra delstudier där förares bedömningar av restid (Studie I och II), bränsleåtgång (Studie III) och medelhastighet (Studie IV) studeras i relation till faktiska fysikaliska mått. Tidigare enkätstudier har påvisat ett kognitivt bias i tidsvinstbedömningar vid höga och låga hastigheter som påverkar mänskligt beteende. Studie I visade att detta bias också förekommer i en primärt perceptuell motorisk uppgift där förarna i studien kör i en körsimulator. Studie II visade att dessa intuitiva tidsbedömningar kan förbättras genom att köra med en alternativ hastighetsmätare i bilen som indikerar den inverterade hastigheten i minuter per kilometer istället för hastigheten i kilometer per timme. I Studie III undersöktes bedömningar av bränsleåtgång vid hastighetsökningar och hastighetssänkningar, och resultaten visar att bedömningarna systematiskt avviker från faktisk bränsleåtgång. Ett intressant resultat var att lastbilsförare i allmänhet underskattade bränslebesparingen som kan göras till följd av en hastighetssänkning. Studie IV visade att subjektiva bedömningar av medelhastighet som avviker från objektiva medelhastigheter kan predicera vägval, vilket tyder på att systematiska fel i dessa bedömningar är robusta och kan predicera vägval. Sammanfattningsvis visar avhandlingen hur bedömningar av medelhastighet, tidsvinst och bränsleåtgång systematiskt avviker från fysikaliska mått. Resultaten har betydelse för modellering av resebeteende och design av förarstödssystem.
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 3: Submitted.
15
Zhang, Yue. "Design and multi-physical fields analysis of high speed permanent magnet machines." Thesis, Queen's University Belfast, 2018. https://pure.qub.ac.uk/portal/en/theses/design-and-multiphysical-fields-analysis-of-high-speed-permanent-magnet-machines(0ec1f9e7-c2b9-4e46-b974-d1f7b932d9ab).html.
Повний текст джерелаАнотація:
Due to the advantages of high power density, high efficiency and compact size, high speed permanent magnet machines (HSPMMs) have found wide application in industrial areas. Compared with a conventional speed permanent magnet machine, a HSPMM rotor can reach speeds of more than 10,000 rpm, which brings challenges with regard to electromagnetic, thermal and mechanical aspects of machine design. The higher power density also results in larger power loss per unit volume; due to the small machine size, machine thermal dissipation becomes difficult. Moreover, air frictional loss rises dramatically when the rotor is in high speed operation and this may also further increase rotor temperature. Therefore, research into HSPMM power losses and improving machine thermal dissipation capability is of significant interest. HSPMM mechanical issues also need to be considered to ensure safe and reliable machine operation. As rotor speeds rise, rotor strength becomes prominent and critical as the permanent magnets are vulnerable to the large centrifugal force. In addition, the machine rotor should also have enough rigidity and avoid operating at critical speeds. As such, this dissertation focuses on HSPMM design and research. Multi-physical fields analysis of a HSPMM is carried out to calculate machine power losses and temperature distribution, with factors influencing machine performance considered; HSPMM rotor mechanical research and analysis are also carried out and presented in this study. Firstly, the HSPMM design methodology and process are illustrated with machine rotor parameters, PM material, pole numbers and rotor sleeve considered for a 150 kW, 17000 rpm HSPMM. Then, HSPMM performance for different machine stator structures and PM pole arc pole pitches is investigated using the Finite Element Method (FEM) for the machine operating at both no load and full load conditions; HSPMM electromagnetic performance and how it is impacted by machine parameters is also studied. HSPMM power losses are comprehensively investigated in the following chapter. As machine core loss can be significantly increased with increasing machine frequency, it is critical to accurately estimate HSPMM iron loss. Based on the machine iron core magnetic field variation that is obtained by FEM analysis, machine steel iron core loss estimation for HSPMM is performed using an improved method with the influences of alternating and rotating magnetic fields, as well as harmonics effects, considered for high precision. Then the HSPMM air gap magnetic flux density distribution considering machine stator slotting effect is also analytically calculated with its effectiveness verified by FEM results. Then rotor eddy current loss is studied by time-stepping FEM, while the effects of rotor sleeve dimensions and properties, copper shielding composite rotor structure, air gap length, as well as slot opening width are further researched in depth. A PM bevelling method is also proposed and investigated to reduce HSPMM rotor eddy current loss while having little effect on machine output torque. Then a fluid field analysis is carried out to study HSPMM rotor air frictional loss when the rotor is in high speed operation. According to the characteristics of a machine axial forced air cooling system, the HSPMM temperature distribution is investigated by 3-D fluid–thermal coupling CFD modelling with the calculated power losses results. The machine thermal analysis theory and modelling method are also detailed and further explained. HSPMM thermal performance variation due to impacting factors of cooling air velocity, rotor eddy current loss and sleeve thermal conductivity are also comprehensively investigated and studied in this dissertation. The designed HSPMM is prototyped, and temperature experimental tests are also carried out to verify the effectiveness of the research and analysis for HSPMM. Then, thick-walled cylinder theory is introduced to study rotor mechanical strength analytically, while it also verifies the FEM calculation results. Then based on FEM analysis, HSPMM rotor stress distribution is investigated with sleeve material effects on rotor strength discussed. In order to alleviate the rotor sleeve stress, three pole filler materials are comparatively studied, while the temperature impacts on rotor mechanical stress is further considered; sleeve thickness and the interference between PM and sleeve are investigated in an integrated fashion for HSPMM rotor strength analysis, with some conclusions also drawn for HSPMM rotor mechanical design. HSPMM rotor critical speeds are also calculated by the established 3D rotor dynamic analysis FEM model to ensure the rotor is operating in a desirable condition.
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Koksal, Can Emre 1975. "Providing quality of service over high speed electronic and optical switches." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/16908.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.Includes bibliographical references (leaves 235-239).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
In a network, multiple links are interconnected by means of switches. A switch is a device with multiple input and output links, and its job is to move data from the input links to the output links. In this thesis, we focus on a number of fundamental issues concerning the quality of service provided by electronic and optical switches. We discuss various mechanisms that enable the support of quality of service requirements. In particular, we explore fundamental limitations of current high speed packet switches and develop new techniques and architectures that make possible the provision of certain service guarantees. We then study optical wavelength switches and illustrate how similar ideas can be applied in a manner consistent with the current state of optical switching technology. First, we focus on providing rate guarantees over packet switches. We develop a method called rate quantization which converts the set of desired rates into a certain discrete set such that the quality of service guarantees can be greatly improved with a small resource speedup. Moreover, quantization simplifies rate provisioning for dynamically changing traffic demands since it allows service opportunities for different input output link pairs to be scheduled with minimal dependence. We illustrate an isomorphism between packet switch schedulers and Clos networks to develop such schedulers.
(cont.) Next, we evaluate the amount of resource speedup necessary for single stage switches to support multicast rates. This speedup limits the scalability of a single stage multicast switch a great deal. We present an in depth study of multistage switches and propose a number of architectures, along with associated routing and scheduling algorithms. We illustrate how the presence of multiple paths between input output pairs can be exploited to improve the performance of a switch and simplify the scheduling algorithms. Some of our architectures are capable of providing multicast rate guarantees without a need for a resource speedup. We extend our results on switch schedulers and use them for providing service guarantees over optical wavelength switches. We will take the limitations of the optical crossconnects and unavailability of optical memory technology into account, and modify the procedure we developed for electronic switches to make them suitable for various optical wavelength switches. These results will provide understanding of when to move optical switching closer to the end users for an efficient utilization of resources in networks with both optical and electronic technologies.
by Can Emre Koksal.
Ph.D.
17
Ball, Frank. "Supporting quality of service guarantees across multi-hop heteogeneous networks." Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337351.
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Claudet, Andre Aman. "Data reduction for high speed computational analysis of three dimensional coordinate measurement data." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17617.
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Kim, Ee-Eul. "Development of high-speed CCD control system for adaptive optics." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300785.
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20
Lo, Shun-kwong, and 羅信光. "Quality education in physical education: Hongkong secondary students' perception on qualities of physical educationteachers." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31961812.
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Luctkar-Flude, Marian. "Fatigue, physical activity, physical functioning and quality of life in older adults with cancer." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27883.
Повний текст джерелаАнотація:
Cancer is predominantly a disease affecting older persons. 43% of new cancer cases in Canada occur among those who are at least 70 years old, while 25% occur in those aged 60--69 years. Cancer fatigue is the most common symptom associated with cancer and its treatment, and is often the most distressing symptom reported by cancer patients. Cancer fatigue adversely affects physical activity levels, physical function, and quality of life. Physical function is essential to older adults in maintaining independence and associated quality of life which is often more important to older adults than cancer survival. Recent research studies suggest that physical activity may reduce fatigue, and maintain or improve physical function levels and quality of life in cancer patients during and following treatment.
This thesis examines cancer fatigue and its relationship to physical activity, physical function, and quality of life in older adults with cancer. The results of a systematic review and the findings of a secondary analysis research study are presented. The systematic review provided evidence that physical activity may reduce fatigue in older cancer patients during and after cancer treatment and may help to maintain or improve physical function and quality of life in this population. Results of the secondary analysis indicated that cancer fatigue is prevalent and was the most frequently reported symptom at baseline, three months and six months post consultation for cancer treatment. Cancer fatigue was associated with lower levels of physical function and quality of life. Physical activity, a modifiable factor, was found to be significantly related to cancer fatigue at three months and six months, regardless of age, and was significantly related to physical function at six months.
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Hansen, Audrey Jo Crumpler Thomas P. "Going beyond accreditation what defines a quality athletic training education program? /." Normal, Ill. : Illinois State University, 2007. http://proquest.umi.com/pqdweb?index=0&did=1390312271&SrchMode=1&sid=3&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1202750911&clientId=43838.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--Illinois State University, 2007.Title from title page screen, viewed on February 11, 2008. Dissertation Committee: Thomas P. Crumpler (chair), Todd A. McLoda, Cheri A. Toledo, Nancy I. Latham. Includes bibliographical references (leaves 79-88) and abstract. Also available in print.
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Azizan, A. "Physical layer performance analysis of Satellite High Speed Downlink Packet Access (S-HSDPA)." Thesis, University of Surrey, 2008. http://epubs.surrey.ac.uk/842979/.
Повний текст джерелаАнотація:
This thesis considers the physical layer performance of the Satellite High Speed Downlink Packet Access (S-HSDPA) system via ground based relays or intermediate Module Repeaters (IMRs). The work evaluates the modifications needed for the terrestrial HSDPA system to a satellite architecture by change of certain significant parameters within a high dispersive IMR environment to deliver high data throughput to satellite mobile terminals. Initial results for S-HSDPA with different terminal capabilities and modulation formats have been obtained. Two diversity techniques, namely receive antenna diversity and space time transmit diversity (STTD) were also investigated. The impact of increasing the number of multicodes transmission for the S-HSDPA system has also been considered. In all of these results, we have shown the capacity to be insufficient to support an economic operational system. In order to investigate improved capacity we have analyzed two advance receiver techniques using channel equalizers and multipath interference cancellers. The performances of two low complexity chip-level adaptive equalizers (CPICH NLMS equalizer and Griffiths' equalizer) equalizer) and the multipath interference canceller (MPIC) have been compared with the conventional RAKE receiver for the S-HSDPA system in an IMR environment. It has been shown that the equalizers can increase the throughput in comparison to the conventional Rake receiver while incurring minimum additional complexity. Thus it is concluded that advanced terminal receivers will be necessary in any practical satellite system. Finally, a study of the orthogonality factor (which parameterizes the intracell interference), as a crucial parameter in the calculation of downlink satellite power has been performed in the IMR environment. Results of the orthogonality factor are presented for multicode S-HSDPA transmission for simple receivers and the use of receive antenna diversity. Using the equalizer based receivers it is shown that the orthogonality factor statistics can be significantly lowered as compared to the conventional matched filter receiver.
24
Tsang, Ho-on Frederick. "Time variable parameter estimation on the wind speed air quality model in Hong Kong /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14723554.
Повний текст джерела
25
Clamon, Travis, Ashley Sergiadis, and Jennifer Young. "Not Enough Cooks in the Kitchen: Balancing Quality and Speed in Services." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/1489.
Повний текст джерелаАнотація:
Do you find it hard to envision the future when you are struggling to keep up with the present? A reality in many libraries is high demand but limited resources. In this session, participants will develop a menu of current services offered in their position or department. After group discussions on criteria for evaluating services and shortening workflows, participants will eliminate one service and/or shorten its prep time in order to add a forward thinking service.
26
Ahmed, Ibrahim. "Comparative evaluation of different power quality issues of variable speed wind turbines." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15920.
Повний текст джерелаАнотація:
The generation of wind energy deliberately becomes a significant part of generated electrical power in developed nations. Factors like fluctuation in natural wind speed and the use of power electronics present issues related power quality in wind turbine application. Following to the fact that there have been remarkable increase of wind energy in the electrical energy production worldwide, the effect on power quality and power system stability caused by wind power is considered significant, and hence the evaluation of this effect is crucial and obligatory. In order to examine and evaluate the characteristics of power quality of grid-integration of wind power in a persistent and authentic manner, several guidelines were introduced and established. One of the widely used guideline to define power quality of wind turbine is IEC standard 61400-21. Moreover, power system operator demands wind turbines to tolerate a certain voltage dip in some countries. The wind turbines concepts such as doubly-fed induction generator wind turbine and the direct driven wind turbine wind turbine with a permanent magnet synchronous generator are considered as the most promising concepts among other wind turbine types since they can operate in wide range of wind speed. The major goal of this PhD work is to examine the power quality character aspects of these wind turbine concepts. The power quality problems were calculated according to that devised by IEC- 61400-21 and then compared afterwards. The research includes the evaluation of the following power quality characteristics: voltage dip response, current harmonics distortion, control of active and reactive power and voltage flicker. Besides the IEC-standard 61400-21, the study also looks into the short-circuit current and fault-ride through with specifications provided by some grid codes, as power system stability is greatly influenced by these aspects. In order to achieve the research's goal, a reliable dynamic model of wind turbine system and control are required. Thus a complete model for both wind turbines systems was developed in PSCAD/EMTDC simulation-program which is the fanatical power system analysis tool, which can achieve a complete simulation of the system dynamic behaviour from the wind turbine. Two controllers are adopted for wind turbine system, converter control and pitch angle control. The converter controlled by a vector control in order to regulate the active and the reactive power whereas the pitch control scheme is put to function to limit the aerodynamic power in high wind speed. The ability of providing adequate state steady and dynamic performances are what wind turbine assures, as examined by simulation results, and via this, problems related to power quality caused by integrating wind turbines to the grid can be studied by wind turbine model.
27
UchÃa, Juliana Izabel Lara. "I-UPQC for electric power quality improvement in wind turbine fixed speed." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16362.
Повний текст джерелаАнотація:
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoFixed speed wind turbines completely dominated the market until the mid-1990s and currently. Although most installed wind turbine are variable speed, many fixed speed wind are still in operation. In this context, this work presents a study concerned to coordinated operation of FACTS (Flexible Alternating Current Transmission Systems) device with fixed speed wind energy conversion system (WECS) equipped with a squirrel cage induction generator. The applied FACTS device is based on the control strategy of the Unified Conditioner Power Quality with inverted topology (i-UPQC), and consists of two static converters connected in back-to-back topology. A model was developed in the software PSCAD/EMTDC, tested under four different scenarios and discussed in order to validate the presented theory. The i-UPQC performance was analyzed for improving voltage quality in the point of common coupling (PCC), reduction of the harmonic currents drained from the wind turbine, and increasing the induction generator capacity to remain connected during a momentary collapse in the grid voltage. The i-UPQC presented good performance due to its capability to warrant the quality in the PCC voltage in spite of the wind variation and that the voltage sags at the PCC do not change the stator voltages. About the generator current, the i-UPQC has kept the stator current free of harmonic components and the effect of unbalanced loads. Under normal operation it was demonstrated that one of the I-UPQC converters can be sized as 50\% of the generator rated power, which is an advantage for real implementation. A comparison between two ways to connect the I-UPQC to the grid, along with the wind turbine, was made. The series converter connected between the wind turbine and the parallel converter, or between parallel converter and the common connection point (PCC). It was concluded that the shunt converter connected to the generator presents better performance than the series converter due to series converter currents are less than the stator currents. Under this configuration, there is no active power current from the generator injected in the PCC during voltage sags.
Turbinas de velocidade fixa dominaram completamente o mercado atà meados de 1990 e atualmente, apesar da maioria dos aerogeradores instalados serem de velocidade variÃvel, muitos aerogeradores de velocidade fixa ainda se encontram em funcionamento. Neste contexto, este trabalho apresenta um estudo sobre a operaÃÃo coordenada de um dispositivo FACTS (Flexible Alternating Current Transmission Systems) com um aerogerador de velocidade fixa, equipado com gerador de induÃÃo gaiola de esquilo. O dispositivo FACTS aplicado baseia-se na estratÃgia de controle do Condicionador Unificado de Qualidade de Energia com topologia invertida (i-UPQC, do inglÃs, Unified Power Quality Conditioner with inverted topology), e consiste de dois conversores estÃticos na configuraÃÃo back-to-back. Um modelo foi desenvolvido no software PSCAD/EMTDC e quatro cenÃrios diferentes foram simulados e discutidos a fim de validar a teoria apresentada. A partir dos resultados de simulaÃÃo, foi analisado o desempenho do i-UPQC para melhoria da qualidade da tensÃo no Ponto de ConexÃo Comum (PCC), diminuiÃÃo das correntes harmÃnicas drenadas do aerogerador e aumento da capacidade do gerador de induÃÃo de se manter conectado durante um afundamento momentÃneo da tensÃo da rede. O i-UPQC atuou de forma satisfatÃria, pois nÃo permitiu que variaÃÃes na velocidade do vento afetassem a qualidade da tensÃo fornecida ao PCC, nem que o afundamento da tensÃo no PCC alterasse a tensÃo nos terminais do estator. Quando cargas nÃo lineares foram adicionadas no sistema, o i-UPQC manteve a corrente do estator livre das componentes harmÃnicas e desbalanÃos presentes na corrente da carga. Demonstrou-se que, em condiÃÃes normais de operaÃÃo, um dos conversores do i-UPQC pode ser especificado para 50\% da potÃncia nominal do aerogerador, o que pode representar uma vantagem do i-UPQC para o caso de uma implementaÃÃo real. Foi feita uma comparaÃÃo entre duas diferentes configuraÃÃes de conexÃo do i-UPQC com o aerogerador e a rede: ora com o conversor paralelo conectado entre o conversor sÃrie e o ponto de conexÃo comum (PCC), ora conectado entre o aerogerador e o conversor sÃrie. Concluiu-se que a configuraÃÃo com o conversor paralelo conectado ao aerogerador à mais vantajosa, pois a corrente que circula atravÃs do conversor sÃrie à menor que a corrente do estator. Nesta configuraÃÃo, nenhuma corrente referente à potÃncia ativa do aerogerador à injetada no PCC durante um afundamento de tensÃo.
28
Carlson, Thomas. "High Speed Atomic Force Microscope Design Using DVD Optics." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3427.
Повний текст джерелаАнотація:
We examine the design of a high speed atomic force microscope using an optical pickup from a commercially available compact disc/digital versatile disc drive. An investigation of the commercial optical pickup is done with the goal of determining how it can be used for dimensional measurements on nanometer scale. An evaluation of noise sources, imaging capabilities, and functionality is performed.
29
Robbins, Audrey A. "Physical attractiveness : the affect on perceived quality in clothing." Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1372054.
Повний текст джерелаАнотація:
The purpose of the study was to determine the perception of apparel quality based on perceived physical attractiveness of both the observer and model. Although there is research about apparel quality, what people view as physically attractive, and how people determine what is attractive, there has been little research about the relationship between these variables as well as observer background.Ninety-three Fashion Merchandising/Apparel Design and non majors completed one of two versions of a survey. The survey was presented on-line and included a picture that participants were asked to assess model attractiveness and apparel quality. A second version included a different model wearing similar clothing. Participants were also asked to rate their own attractiveness in relationship to the model and what quality features they consider when purchasing clothing.Frequencies and a two way ANOVA analysis revealed a statistically significant difference for model viewed/survey completed. Ratings of quality characteristics correlated to form a scale of quality. Education background influenced responses.Department of Family and Consumer Sciences
30
Freire, Alcione GuimarÃes. "Physical quality indexes for a Cambisol in management systems." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8141.
Повний текст джерелаАнотація:
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoThe Apodi Tableland has emerged as a promising pole of irrigated fruit because of the agricultural potential of its soils. Soils of Apodi Tableland are subjected to different types of management, thus conditioning changes in their physical attributes. This work aims to evaluate physically a Cambisol cultivated with papaya (Carica papaya L.) under two tillage systems, compared to another under secondary forest. Soil samples with disturbed and undisturbed structure were collected for physical analysis, namely: texture, clay dispersed in water, bulk density, particle density, aggregate stability, organic carbon, soil water retention curve, soil air permeability and soil resistance to penetration. Clay flocculation degree, soil porosity and indices related to porous geometry and organic matter were calculated. A soil water infiltration test was performed at field. The factorial scheme was 3x3x5 (two soil management systems â papaya planted on furrow and ridge â and secondary forest; three soil layers â 0-0.1 m; 0.1-0.2 m, 0.2-0.3 m; five replications), conducted in a completely randomized design, except for the hydraulic conductivity, which adopted a factorial scheme 3x2x5 (two soil management systems and secondary forest; two tensions â 0 hPa and 5 hPa, five replications). The Kolmorogov-Smirnov Test was used to verify the data set normality, the F Test for variance analysis, the Tukey Test for means comparison (all using p-value = 0.05) and multivariate analysis techniques. It was concluded that: a) the hipothesis that the tillage systems physically worsen soil was refuted, indicating that the quality of the attributes of cultivated soil, in general, has been maintained or improved in relation to the status of the native soil; b) the decreases of the organic matter content, percentage of stable aggregates in the diameter class of 4.76 to 2.00 mm and the average diameter on the cultivated soil, although they are still far from critical limits, are indicative of the need for adoption of management practices that avoid triggering a soil degradation process; c) the quality indices were sensitive to changes caused by soil tillage systems and therefore can be used as a source for understanding the dynamics of soil physical processes in time; d) the proposed indicator for evaluating soil physical quality, Srelative, was sensitive to measure the soil response to the action on its structure.
A Chapada do Apodi vem se destacando como um promissor polo de fruticultura irrigada em virtude da potencialidade agrÃcola dos seus solos, os quais sÃo submetidos a diferentes tipos de manejo, condicionando mudanÃas em seus atributos fÃsicos. O trabalho teve como objetivo avaliar fisicamente um Cambissolo cultivado com mamoeiro (Carica papaya L.) sob dois sistemas de manejo, comparado com um sob vegetaÃÃo nativa. Foram coletadas amostras de solo com estruturas deformada e indeformada para a realizaÃÃo das anÃlises fÃsicas, a saber: granulometria, argila dispersa em Ãgua, densidade do solo e de partÃculas, estabilidade de agregados, carbono orgÃnico, curva caracterÃstica de Ãgua no solo, permeabilidade intrÃnseca do solo ao ar e resistÃncia à penetraÃÃo. Foram calculados o grau de floculaÃÃo das argilas, a porosidade do solo, Ãndices relativos à geometria porosa e matÃria orgÃnica. Em campo foi realizado ensaio de infiltraÃÃo de Ãgua no solo. Os dados experimentais foram analisados considerando o delineamento inteiramente casualizado, adotando-se para todas as anÃlises o esquema em parcela subdividida 3x3x5 (dois sistemas de manejo do solo â plantio do mamoeiro em sulco e camalhÃo â e mata nativa secundÃria; trÃs camadas de solo â 0,0-0,1 m; 0,1-0,2 m e 0,2-0,3 m; cinco repetiÃÃes), exceÃÃo para a condutividade hidrÃulica, em que se adotou o esquema fatorial 3x2x5 (dois sistemas de manejo do solo e mata nativa; duas tensÃes â 0 hPa e 5 hPa; cinco repetiÃÃes). Foram aplicados os testes de Kolmogorov-Smirnov para verificar a normalidade dos dados, o F para a anÃlise de variÃncia, o de Tukey para a comparaÃÃo de mÃdias (todos a 5% de probabilidade) e tÃcnicas multivariadas de anÃlise. Concluiu-se que: a) a hipÃtese de que os sistemas de cultivo pioram os solos fisicamente foi refutada, indicando que a qualidade dos atributos do solo sob cultivo, em geral, està mantida ou melhorada em relaÃÃo à condiÃÃo de mata nativa; b) o decrÃscimo do teor de matÃria orgÃnica, da percentagem de agregados estÃveis na classe de 4,76-2,00 mm de diÃmetro e do diÃmetro mÃdio ponderado em solo cultivado, apesar de ainda estarem distantes de limites considerados crÃticos, sÃo indicadores da necessidade de adoÃÃo de prÃticas de manejo que evitem o desencadeamento de um processo de degradaÃÃo do solo; c) os indicadores de qualidade foram sensÃveis Ãs alteraÃÃes provocadas pelos sistemas de manejo do solo e, portanto, podem ser utilizados como fonte para a interpretaÃÃo da dinÃmica de processos fÃsicos do solo no tempo; d) O indicador proposto para a avaliaÃÃo da qualidade fÃsica do solo, o Srelativo, mostrou-se sensÃvel para mensurar a resposta do solo Ãs aÃÃes sobre sua estrutura.
31
Marchyk, V. I. "Quality physical education teachers of primary schools as problem." Thesis, Sumy State Uiversity, 2016. http://essuir.sumdu.edu.ua/handle/123456789/48649.
Повний текст джерелаАнотація:
With the first years of schooling the students formed a culture of
motor activity and how effective it will be depends on the quality of
physical education teachers of primary school.
The last few years of primary school is working on a new
program "Physical Culture" for grades 1-4 is designed according to
the State standard primary education (approved by the Cabinet of
Ministers of Ukraine of 20.04.2011 number 462).
32
Blanpain, Yannick. "A scalable and deployable approach for achieving fair rate allocation in high speed networks." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14868.
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33
Nilsson, Magnus. "Modelingflywheel-Speed Variations Based on Cylinder Pressure." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2333.
Повний текст джерелаАнотація:
Combustion supervision by evaluating flywheel speed variations is a common approach in the automotive industry. This often involves preliminary measurements. An adequate model for simulating flywheel speed can assist to avoid some of these preliminary measurements.
A physical nonlinear model for simulating flywheel speed based on cylinder pressure information is investigated in this work. Measurements were conducted at Scania in a test bed and on a chassis dynamometer. The model was implemented in MATLAB/Simulink and simulations are compared to measured data. The first model can not explain all dynamics for the measurements in the test bed so extended models are examined. A model using a dynamically equivalent model of the crank-slider mechanism shows no difference from the simple model, whereas a model including a driveline can explain more from the test-bed measurements. When simulating the setups used at the chassis dynamometer, the simplest model works best. Yet, it is not very accurate and it is proposed that optimization of parameter values might improve the model further. A sensitivity analysis shows that the model is fairly robust to parameter changes.
A continuation of this work might include optimization to estimate parameter values in the model. Investigating methods for combustion supervision may also be a future issue.
34
Haas, Barbara Kay. "Fatigue, self-efficacy for physical activity, physical activity, and quality of life in women with breast cancer." Full text (off-campus access restricted to users with UT Austin EID) Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3037017.
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35
Wendel, Charlotta. "Multivariate modeling improves quality grading of sawn timber." Thesis, Umeå universitet, Institutionen för fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160765.
Повний текст джерелаАнотація:
The quality grades are what determines the value of sawn timber. Therefore the grading process is essential for the profitability of a sawmill. At a modern sawmill in northern Sweden, a CT Log Computed Tomography is used in the saw line to optimize the cutting solutions by virtual 3D reconstruction of the log features. By adjusting the position of the log according to the optimal solution before cutting, the aim is to increase the quality and final resale value of the sawn timber. However, measurement errors in the virtual and final grading systems cause inconsistencies that decrease the agreement in grading. The grading process uses a rule-based system based on the Nordic Timber Grading Rules, which depends strongly on the size and shape of knots. If knots are measured incorrectly they could falsely exceed the allowed value for a certain quality, resulting in an inaccurate quality grade. The results from this initial project, show that using multivariate modeling instead of the traditional rule-based grading system improves the agreement between the virtual and final grading. The accuracy in grading increases with up to 19%, resulting in an agreement of 73%. A better agreement between the two systems would allow the process to take advantage of the full potential of the CT, increasing the profitability of the sawmill. The results are promising, but before implementing the method in the sawmill further testing and development have to be done to ensure optimal improvement.
36
Komolafe, Olufemi O. "High-speed optical packet switching over arbitrary physical topologies using the Manhattan Street Network." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366847.
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37
Hanumanthu, Jyothsna. "A study of cluster cavitation erosion using electrochemical, physical and high-speed imaging techniques." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/350483/.
Повний текст джерелаАнотація:
Cluster cavitation erosion, generated by piston-like emitter (PLE) vibrating at ultrasonic frequencies, was measured using a novel aluminium erosion sensor in conjunction with optoisolation techniques, in order to bridge the electrochemical detection of cavitation erosion with a counting device possessing USB connectivity, while minimising electrical noise. High-speed imaging assisted in correlating the periodicity of cluster collapse with the frequency of erosion events detected by the sensor. The consistency of the shape and duration of current-time transients associated with erosion were shown to be dependent on drive voltage amplitude and drive frequency of the PLE. Erosion in the presence of silicon carbide particles, agitated by the PLE, was measured in an identical manner. Cluster cavitation dynamics were shown to be affected by the presence of silicon carbide, making it difficult to ascertain whether erosion events were due to silicon carbide grazing the sensor surface or whether the events were bubble-driven. Subsequent high-speed imaging and analysis of the shapes of current-time transients, suggested that under certain experimental conditions, erosion of the sensor surface could be attributed to silicon carbide particles. Analysis of the acoustic noise spectrum generated during inertial cavitation showed that an increase in the magnitude of the 2f component and the presence of the f/2 component corresponded with the onset of non-inertial bubble collapse and inertial cavitation erosion respectively. However, no subsequent correlation could be made between the magnitude of the f/2 component and the extent of erosion detected. Measurements from both a hydrophone and microphone gave similar results. The effect of a liquid’s physical properties on the sonoluminescence intensity was investigated by analysing the results of prior studies and experiments conducted here using an image intensifier. Sonoluminescence intensity was found to increase with normal boiling point of a liquid assuming identical experimental conditions (drive frequency, voltage, ambient temperature), and provided the boiling point did not exceed c. 200 oC.
38
Russell, Benjamin James. "Geometric control for analysing the quantum speed limit and the physical limitations of computers." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/8716/.
Повний текст джерелаАнотація:
This thesis studies the role of Finsler geometry in quantum time optimal control of systems with constrained control field power and other constraints. The systems considered are all finite dimensional systems with pure states. A Finsler metric is constructed such that its geodesics are the time optimal trajectories for the quantum time evolution operator on the special unitary group. This metric is shown to be right invariant. The geodesic equation, in the form of an Euler-Poincar\' equation is found. It is also shown that the geodesic lengths of this same metric equal the optimal times for implementing any desired quantum gate. In a special case, where all are control fields are equally constrained, the desired geodesics are found in closed form. The results obtained are discussed in the general context of natural computation.
39
Welters, Martin [Verfasser]. "Potenzial der High-Speed Physical Vapour Deposition Technologie zur Abscheidung oxidischer Werkzeugbeschichtungen / Martin Welters." Düren : Shaker, 2021. http://d-nb.info/1233547852/34.
Повний текст джерела
40
Roach, Neil. "The Biomechanics and Evolution of High-Speed Throwing." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10609.
Повний текст джерелаАнотація:
Throwing with power and accuracy is a uniquely human behavior and a potentially important mode of early hunting. Chimpanzees, our closest living relatives, do occasionally throw, although with much less velocity. At some point in our evolutionary history, hominins developed the ability to produce high performance throws. The anatomical changes that enable increased throwing ability are poorly understood and the antiquity of this behavior is unknown. In this thesis, I examine how anatomical shifts in the upper body known to occur during human evolution affect throwing performance. I propose a new biomechanical model for how humans amplify power during high-speed throwing using elastic energy stored and released in the throwing shoulder. I also propose and experimentally test a series of functional hypotheses regarding how four key shifts in upper body anatomy affect throwing performance: increased torso rotational mobility, laterally oriented shoulders, lower humeral torsion, and increased wrist hyperextensability. These hypotheses are tested by collecting 3D body motion data during throws performed by human subjects in whom I varied anatomical parameters using restrictive braces to examine their effects on throwing kinematics. These data are broken down using inverse dynamics analysis into the individual motions, velocities, and forces acting around each joint axis. I compare performance at each joint across experimental conditions to test hypotheses regarding the relationship between skeletal features and throwing performance. I also developed and tested a method for predicting humeral torsion using range of motion data, allowing me to calculate torsion in my subjects and determine its effect on throwing performance. My results strongly support an important role for elastic energy storage in powering humans’ uniquely rapid throwing motion. I also found strong performance effects related to anatomical shifts in the torso, shoulder, and arm. When used to interpret the hominin fossil record, my data suggest high-speed throwing ability arose in a mosaic-like fashion, with all relevant features first present in Homo erectus. What drove the evolution of these anatomical shifts is unknown, but as a result the ability to produce high-speed throws was available for early hunting and likely provided an adaptive advantage in this context.Anthropology
41
Hörnedal, Niklas. "Generalizations of the Mandelstam-Tamm Quantum Speed Limit." Thesis, Stockholms universitet, Fysikum, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-193265.
Повний текст джерелаАнотація:
Quantum speed limits are lower bounds on the evolution time for quantum systems. In this thesis, we consider closed quantum systems. We investigate how different principal bundles offers a geometrical method for obtaining generalizations of the Mandelstam-Tamm quantum speed limit for mixed states. We look at three different principal bundles from which we derive two already known quantum speed limits, the Uhlmann and Andersson QSLs, and one which is new, the Grassmann QSL. We also investigate the tightness of these quantum speed limits and how they compare with each other.
42
Tsang, Ho-on Frederick, and 曾可安. "Time variable parameter estimation on the wind speed air quality modelin Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31253283.
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43
O'Neill, Shane J. "High-speed traffic management for quality of service in next generation IP switches." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479398.
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44
Crawford, John. "A hybrid approach to quality of service multicast routing in high speed networks." Thesis, University of Kent, 1998. https://kar.kent.ac.uk/21585/.
Повний текст джерелаАнотація:
Multimedia services envisaged for high speed networks may have large numbers of users, require high volumes of network resources and have real-time delay constraints. For these reasons, several multicast routing heuristics that use two link metrics have been proposed with the objective of minimising multicast tree cost while maintaining a bound on delay. Previous evaluation work has compared the relative average performance of some of these heuristics and concludes that they are generally efficient. This thesis presents a detailed analysis and evaluation of these heuristics which illustrate that in some situations their average performance is prone to wide variance for a particular multicast in a specific network. It concludes that the efficiency of an heuristic solution depends on the topology of both the network and the multicast, which is difficult to predict. The integration of two heuristics with Dijkstras shortest path tree algorithm is proposed, to produce a hybrid that consistently generates efficient multicast solutions for all possible multicast groups in any network. The evaluation results show good performance over a wide range of networks (flat and hierarchical) and multicast groups, within differing delay bounds. The more efficient the multicast tree is, the less stable it will be as multicast group membership changes. An efficient heuristic is extended to ensure multicast tree stability where multicast group membership is dynamic. This extension decreases the efficiency of the heuristics solutions, although they remain significantly cheaper than the worst case, a shortest delay path tree. This thesis also discusses how the hybrid and the extended heuristic might be applied to multicast routing protocols for the Internet and ATM Networks. Additionally, the behaviour of the heuristics is examined in networks that use a single link metric to calculate multicast trees and concludes one of the heuristics may be of benefit in such networks.
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Lo, Shun-kwong. "Quality education in physical education : Hong kong secondary students' perception on qualities of physical education teachers /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B22277766.
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Jung, Helen. "Physical performance and health-related quality of life post-stroke." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33788.
Повний текст джерелаАнотація:
Reduced levels of health-related quality of life (HRQL) post-stroke are an important issue to address in rehabilitation. Despite improvement in function over time, HRQL remains poor for many stroke survivors. This longitudinal study is aimed at estimating the extent to which physical performance, social, and psychological functioning influence HRQL.Forty-three community-living persons with stroke were recruited to participate in a six-week intervention preceded and followed by a performance- and interview-based evaluation assessing different levels of disability and functioning. HRQL was measured by the VAS of the EQ-5D.
Regression models generated cross-sectionally demonstrated that physical performance, social, and psychological functioning explained up to 90% of the variation in HRQL. A GEE model revealed that, over time, only upper extremity functioning had a significant relationship with HRQL.
Much attention has already been focused on increasing physical performance in rehabilitation. However, clinicians should consider other components that affect HRQL directly or indirectly through physical performance. Only by treating the different components of functioning at various levels can HRQL be ultimately increased.
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Sheung-kei, Winnie S. "Cooking quality: physical and biochemical properties of lentils (Lens culinaris)." Curtin University of Technology, School of Public Health, 2000. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10354.
Повний текст джерелаАнотація:
Lentils, one of the cool-season pulses, are consumed as a staple food in most developing countries. The demand for pulses in western societies is increasing because of its valuable nutritional quality and an increased awareness of health issues. Australia has a good reputation for producing clean low moisture legume products and could increase as market share of lentil production by identifying, developing and promoting good quality varieties.Lentils which are graded as good quality varieties must have a short and uniform cooking time, without 'hard to cook' seed, have the hull stay attached to the seed during cooking, and have a final acceptable taste, texture, flavour and appearance after cooking (Bhatty 1990). Cooking quality in this study is defined as the maximum force (N) that is required to compress the whole seed cooked product after cooking for a standard period of time. This study aims to develop an objective measurement to determine the cooking quality of lentils and thereby evaluates the relationships between lentil cooking quality and some of its physical and biochemical properties. Four cultivars used (Cassab, Digger, ILL 7180 and Matilda) were grown during 1999 at Mullewa and Pingaring, Western Australia. The relationship between the cooking quality of lentil and water absorption, seed size, seed coat thickness, phytic acid, mineral composition and initial moisture content was investigated.Texture measurement was carried out using the TA.XT2i meter as an alternative to the subjective method "Cooking time test". By comparing the cooking time determined by 'Cooking time test, 220 N was established and suggested as an optimal peak compression force to determine the adequate cooking time for lentils. Both methods showed that 35 minutes cooking time was adequate for red lentils (Cassab, Digger, and ILL 7180), and 45 minutes for green lentils ++(Matilda).Cooking significantly reduced the hardness of the seeds (R= - 0.752 to - 0.89) and promoted mineral leaching (P < 0.05). The interaction between environment and genotype had a significant effect on seed size, seed coat thickness, mineral composition (Phytic acid, Ne, K+, Mg2+, Ca2+ M+, Fe2+ and CU2+) and hardness (P< 0.05). Seed coat thickness did not correlated with this rate of water uptake and cooking quality. Growing environments had a greater influence on the cooking quality than genotypes. Lentils grown at Pingaring are generally had a higher in Phyti acid content, better mineral retention and were harder in texture than those grown at Mullewa.The results of this study implicated that the peak compression force (220 N) was identified as an indicator to determine the cooking time of lentil cultivars. Texture Profile Analysis (TPA) is a useful method to evaluate various texture characteristics (hardness, cohesiveness, chewiness, springiness, gumminess and adhesiveness) of lentil cultivars. Cooking quality of lentil is significantly affected by the effect of varieties and growing locations. However, not the various biochemical compositions (phytic acid and minerals) and the thickness of seed coat have no significant effect on the cooking quality of lentil.
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Carothers, Cathleen de Souza Lourenco Collins John R. "Minimum levels of physical activity and perceived quality of life." [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-6127.
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Gehring, Curran Kenji. "Improvement of the physical and nutritional quality of pelleted feed." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10563.
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Elhabashy, Ahmed Essam. "Quality Control Tools for Cyber-Physical Security of Production Systems." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/86725.
Повний текст джерелаАнотація:
With recent advancements in computer and network technologies, cyber-physical systems have become more susceptible to cyber-attacks; and production systems are no exception. Unlike traditional Information Technology (IT) systems, cyber-physical systems are not limited to attacks aimed at Intellectual Property (IP) theft, but also include attacks that maliciously affect the physical world. In manufacturing, such cyber-physical attacks can destroy equipment, force dimensional product changes, alter a product's mechanical characteristics, or endanger human lives.
The manufacturing industry often relies on modern Quality Control (QC) tools to protect against quality losses, such as those that can occur from an attack. However, cyber-physical attacks can still be designed to avoid detection by traditional QC methods, which suggests a strong need for new and more robust QC tools. Such new tools should be able to prevent, or at least minimize, the effects of cyber-physical attacks on production systems. Unfortunately, little to no research has been done on using QC tools for cyber-physical security of production systems.
Hence, the overarching goal of this work is to allow QC systems to be designed and used effectively as a second line of defense, when traditional cyber-security techniques fail and the production system is already breached. To this end, this work focuses on: 1) understanding the role of QC systems in cyber-physical attacks within manufacturing through developing a taxonomy encompassing the different layers involved; 2) identifying existing weaknesses in QC tools and exploring the effects of exploiting them by cyber-physical attacks; and 3) proposing more effective QC tools that can overcome existing weaknesses by introducing randomness to the tools, for better security against cyber-physical attacks in manufacturing.Ph. D.
The recent technological developments in computers and networking have made systems, such as production systems, more vulnerable to attacks having both cyber and physical components; i.e., to cyber-physical attacks. In manufacturing, such attacks are not only capable of stealing valuable information, but can also destroy equipment, force physical product changes, alter product’s mechanical characteristics, or endanger human lives. Typically, the manufacturing industry have relied on various Quality Control (QC) tools, such as product inspection, to detect the effects caused by these attacks. However, these attacks could be still designed in a way to avoid detection by traditional QC methods, which suggests a need for new and more effective QC tools. Such new tools should be able to prevent, or at least minimize, the effects of these attacks in manufacturing. Unfortunately, almost no research has been done on using QC tools for securing production systems against these malicious attacks. Hence, the overarching goal of this work is to allow QC systems to be designed in a more effective manner to act as a second line of defense, when traditional cyber-security measures and attackers have already accessed the production system. To this end, this work focuses on: 1) understanding the role of QC systems during the attack; 2) identifying existing weaknesses in QC tools and determining the effects of exploiting them by the attack; and 3) proposing more effective QC tools, for better protection against these types of cyber-physical attacks in manufacturing.