Tesis sobre el tema "Large-scale measurement"
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Motamedi, Reza. "Measurement-based Characterization of Large-Scale Networked Systems". Thesis, University of Oregon, 2017. http://hdl.handle.net/1794/22267.
Texto completoLee, Hsin-Tsang. "IRLbot: design and performance analysis of a large-scale web crawler". Texas A&M University, 2008. http://hdl.handle.net/1969.1/85914.
Texto completoHarpold, Adrian Adam. "Stream Discharge Measurement Using A Large-Scale Paticle Image Velocimetry Prototype". Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/40870.
Texto completoMaster of Science
Xu, Xiaoying. "Robust Measurement of the Cosmic Distance Scale Using Baryon Acoustic Oscillations". Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/241935.
Texto completoBoldetti, Carlo. "Multi-scale measurement and modelling of large deformation of structural metals during thermomechanical processing". Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434486.
Texto completoHecht, Martin. "Optimierung von Messinstrumenten im Large-scale Assessment". Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17270.
Texto completoMeasurement instruments are essential elements in the acquisition of knowledge in scientific research. Special features of measurement instruments in large-scale assessments of student achievement are their frequent reconstruction and the usage of different test versions. Here, threats for the accuracy and validity of the measurement may emerge. To minimize such threats, (a) sources for potential bias of measurement and (b) strategies to optimize measuring instruments should be explored. Therefore, the present dissertation investigates several specific topics within these two research areas.
Shabara, Yahia. "Establishing Large-Scale MIMO Communication: Coding for Channel Estimation". The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618578732285999.
Texto completoMcKellar, Steven. "An extension to the OSI model of network management for large-scale collaborative performance measurement". Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614727.
Texto completoYoon, Yeo Jun. "Study of the utilization and benefits of phasor measurement units for large scale power system state estimation". Texas A&M University, 2005. http://hdl.handle.net/1969.1/3345.
Texto completoDomaleski, Christopher Stephen. "Exploring the Efficacy of Pre-Equating a Large Scale Criterion-Referenced Assessment with Respect to Measurement Equivalence". Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/eps_diss/3.
Texto completoTenorio, Victor Octavio. "Measurement of the Effectiveness of a Decision Support System for Blending Control of Large Scale Coal Mines". Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/242385.
Texto completoThurow, Brian S. "On the convective velocity of large-scale structures in compressible axisymmetric jets". The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1102000184.
Texto completoMuiyser, Jacques. "Simultaneous measurement of air flow conditions and resultant blade and gearbox loading at large-scale cooling system fans". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71805.
Texto completoENGLISH ABSTRACT: Axial flow fans used in large-scale air-cooled steam condensers (ACSCs) may operate under distorted inflow conditions. These conditions occur due to the prevailing wind conditions, the presence of buildings, and the location of the fan within the ACSC. Fans located on the periphery of the ACSC are affected the most due to their exposure to strong winds and the inner fans drawing in air past them. Distorted inflow conditions cause varying fan blade and gearbox loading conditions. The purpose of the investigation was to simultaneously measure the inlet air flow and the resultant blade and gearbox loading conditions of a single fan located on the periphery of a large-scale ACSC. Inlet and heat exchanger bundle outlet air flow velocities were measured using a combination of ultrasonic and propeller anemometers while blade loading was measured with strain gauges attached at the neck of the specific blade being monitored. Strain gauges were also attached to the low-speed fan shaft to measure gearbox loading. Measurements were recorded over a period of 8 days where it was found that increased wind resulted in increased air flow in the axial direction of the fan, which then caused a reduction in average blade loading. This was due to a decreased static pressure rise over the fan. The fan blade was found to vibrate at its own natural frequency of 6 Hz when excited by the variable aerodynamic loading. The aerodynamic loading was extracted from the measured data and was found to correlate well with previous experimental work performed by Bredell et al. (2006a). Shaft bending stresses and torque were found to oscillate at the fan’s rotational frequency of 2Hz with a large torque exerted on the shaft during fan start-up.
AFRIKAANSE OPSOMMING: Aksiaalvloeiwaaiers wat by groot lugverkoelde stoomkondensors gebruik word, werk dikwels onder verwronge inlaat lugvloei toestande wat geskied as gevolg van heersende winde, die teenwoordigheid van geboue en die posisie van die waaier in die kondensor. Waaiers wat geleë is op die rand van die kondensor word die meeste beïnvloed as gevolg van blootstelling aan die sterk winde en dwarsvloei wat deur die binneste waaiers geïnduseer word. Verwronge inlaat lugvloei veroorsaak gevolglik variërende waaierlem en ratkas belastingstoestande. Die doel van hierdie ondersoek was om terselfdetyd die inlaat lugvloei asook waaierlem en ratkas belastingstoestande van ’n enkele waaier wat op die rand van ’n grootskaalse lugverkoelde stoomkondensor geleë is, te meet. Waaier inlaat en warmteruiler uitlaat lugvloei snelhede is gemeet met ’n kombinasie van ultrasoniese- en skroefwindsnelheidsmeters terwyl die lem en ratkas belastings gemeet is met rekstrokies. Metings is oor ’n tydperk van 8 dae geneem. Die bevindinge toon dat ’n toename in windsnelheid ’n toename in aksiale lugvloei tempo, deur die waaier veroorsaak. ’n Afname in die gemiddelde lembelasting is waargeneem as gevolg van ’n afname in die waaier statiese druk. Daar is ontdek dat die waaierlem teen ’n natuurlike frekwensie van 6 Hz vibreer wanneer dit opgewek word deur die wisselende aerodinamiese belasting. Die aerodinamiese belasting is verkry uit die gemete data en vergelyk goed met die numeriese werk van Bredell et al. (2006a). Daar is ook bevind dat waaier-as buigspannings en wringkragte ossileer teen die waaier se rotasiefrekwensie van 2Hz met ’n groot wringkrag wat op die as uitgeoefen word wanneer die waaier aangeskakel word. iii
Farahbakhsh, Reza. "Profiling professional and regular users on popular Internet services based on implementation of large scale Internet measurement tools". Thesis, Evry, Institut national des télécommunications, 2015. http://www.theses.fr/2015TELE0012/document.
Texto completoPopular Internet services are fundamentally shaping and reshaping traditional ways of people communication, thus having a major impact on their social life. Two of the very popular Internet services with this characteristic are Online Social Networks (OSNs) and Peer-to-Peer (P2P) systems. OSNs provide a virtual environment where people can share their information and interests as well as being in contact with other people. On the other hand, P2P systems, which are still one of the popular services with a large proportion of the whole Internet traffic, provide a golden opportunity for their customers to share different type of content including copyrighted content. Apart from the huge popularity of OSNs and P2P systems among regular users, they are being intensively used by professional players (big companies, politician, athletes, celebrities in case of OSNs and professional content publishers in case of P2P) in order to interact with people for different purposes (marketing campaigns, customer feedback, public reputation improvement, etc.). In this thesis, we characterize the behavior of regular and professional users in the two mentioned popular services (OSNs and P2P systems) in terms of publishing strategies, content consumption and behavioral analysis. To this end, five of our conducted studies are presented in this manuscript as follows: - “The evolution of multimedia contents", which presents a thorough analysis on the evolution of multimedia content available in BitTorrent by focusing on four relevant metrics across different content categories: content availability, content popularity, content size and user's feedback. - “The reaction of professional users to antipiracy actions", by examining the impact of two major antipiracy actions, the closure of Megaupload and the implementation of the French antipiracy law (HADOPI), on professional publishers behavior in the largest BitTorrent portal who are major providers of online copyrighted content. - “The amount of disclosed information on Facebook", by investigating the public exposure of Facebook users' profile attributes in a large dataset including half million regular users. - “Professional users Cross Posting Activity", by analyzing the publishing pattern of professional users which includes same information over three major OSNs namely Facebook, Google+ and Twitter. - “Professional Users' Strategies in OSNs", where we investigate the global strategy of professional users by sector (e.g., Cars companies, Clothing companies, Politician, etc.) over Facebook, Google+ and Twitter. The outcomes of this thesis provide an overall vision to understand some important behavioral aspects of different types of users on popular Internet services and these contributions can be used in various domains (e.g. marketing analysis and advertising campaign, etc.) and different parties can benefit from the results and the implemented methodologies such as ISPs and owners of the Services for their future planning or expansion of the current services as well as professional players to increase their success on social media
West, James F. "An examination of the application of design metrics to the development of testing strategies in large-scale SDL models". Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1191725.
Texto completoDepartment of Computer Science
Rabaa'i, Ahmad A. "Evaluating the success of large-scale, integrated information systems through the lens of IS-impact and IS-support". Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/53179/1/Ahmad_Rabaa%27i_Thesis.pdf.
Texto completoLu, Chun, Yihong Yan y Jian Song. "An Application of Sync Time Division Multiplexing in Telemetry System". International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579685.
Texto completoHigh speed real-time data transportation is most important for telemetry systems, especially for large-scale distributed systems. This paper introduces a STDM (Sync Time Division Multiplexing) network structure for data transportation between devices in telemetry systems. The data in these systems is transported through virtual channels between devices. In addition, a proper frame format is designed based on PCM format to meet the needs of synchronization and real-time transportation in large-scale distributed telemetry systems.
Marrodán, Undagoitia Teresa. "Measurement of light emission in organic liquid scintillators and studies towards the search for proton decay in the future large-scale detector LENA". kostenfrei, 2008. http://mediatum2.ub.tum.de/doc/667813/667813.pdf.
Texto completoBajpai, Vaibhav [Verfasser], Jürgen [Akademischer Betreuer] [Gutachter] Schönwälder, Kinga [Gutachter] Lipskoch y Turck Filip [Gutachter] De. "Understanding the Impact of Network Infrastructure Changes using Large-Scale Measurement Platforms / Vaibhav Bajpai. Betreuer: Jürgen Schönwälder. Gutachter: Jürgen Schönwälder ; Kinga Lipskoch ; Filip De Turck". Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2016. http://d-nb.info/1111884455/34.
Texto completoNoorduijn, Saskia L. "Temporal and spatial effects of a long term large scale alley farming experiment on water table dynamics : implications for effective agroforestry design". University of Western Australia. School of Environmental Systems Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0102.
Texto completoEngzell, Per. "Intergenerational Persistence and Ethnic Disparities in Education". Doctoral thesis, Stockholms universitet, Sociologiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-135797.
Texto completoAvhandlingen består av fyra fristående studier som alla berör utbildning och social stratifiering. Studie I undersöker med nyinsamlade enkätdata hur sociala skillnader i skolprestation riskerar att felskattas med bakgrundsuppgifter inhämtade från föräldrar respektive elever. Den viktigaste slutsatsen är att elevuppgifter om föräldrars yrke undviker mycket av den felrapportering som behäftar andra elevsvar, liksom det utbredda problemet med selektivt bortfall bland föräldrar. Villkorliga skattningar av etniska skillnader är relativt opåverkade av dessa metodproblem. Studie II granskar elevers uppgifter om antalet böcker i hemmet. En betydande litteratur har förespråkat denna variabel som ett mått på klasstillhörighet framför föräldrars yrke eller utbildning på grundval av starka samband med elevers studieresultat. Uppsatsen tillämpar en rad metoder på data från en internationell kunskapsutvärdering och finner att sambandens styrka inte vilar på högre tillförlitlighet som tidigare förmodats, utan på endogenitetsproblem av två slag. Lågpresterande elever ackumulerar färre böcker och är dessutom benägna att underskatta deras antal. Studie III använder enkät- och registerdata för att belysa utlandsfödda föräldrars utbildning och dess samband med prestationer bland svenska skolbarn. Två aspekter av utbildningsbakgrund särskiljs: föräldrars utbildningsår samt deras relativa placering i ursprungslandets fördelning. Absolut utbildning visar sig predicera elevers testresultat och betyg, medan relativ utbildning är en bättre prediktor för barns aspirationer. Resultatet är av betydelse för studier av etniska skillnader där statistisk kontroll görs för observerbara föräldraegenskaper. Studie IV tillämpar den positionella ansatsen från Studie III för att förstå utlandsföddas självupplevda status och inkomsttillfredsställelse i europeiska länder. Migranter som är mer högutbildade med ursprungslandets mått mätt än värdlandets tenderar att ha en mer negativ bild av sin nuvarande situation än andra i objektivt liknande omständigheter. Detta kan förstås i termer av sociala referensramar och framhålls som relevant i tolkningen av långsiktiga sociala och ekonomiska integrationsmönster, inklusive de utbildningsval som efterföljande generationer gör.
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.
Gurkan, Gulsah. "From OLS to Multilevel Multidimensional Mixture IRT: A Model Refinement Approach to Investigating Patterns of Relationships in PISA 2012 Data". Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109191.
Texto completoSecondary analyses of international large-scale assessments (ILSA) commonly characterize relationships between variables of interest using correlations. However, the accuracy of correlation estimates is impaired by artefacts such as measurement error and clustering. Despite advancements in methodology, conventional correlation estimates or statistical models not addressing this problem are still commonly used when analyzing ILSA data. This dissertation examines the impact of both the clustered nature of the data and heterogeneous measurement error on the correlations reported between background data and proficiency scales across countries participating in ILSA. In this regard, the operating characteristics of competing modeling techniques are explored by means of applications to data from PISA 2012. Specifically, the estimates of correlations between math self-efficacy and math achievement across countries are the principal focus of this study. Sequentially employing four different statistical techniques, a step-wise model refinement approach is used. After each step, the changes in the within-country correlation estimates are examined in relation to (i) the heterogeneity of distributions, (ii) the amount of measurement error, (iii) the degree of clustering, and (iv) country-level math performance. The results show that correlation estimates gathered from two-dimensional IRT models are more similar across countries in comparison to conventional and multilevel linear modeling estimates. The strength of the relationship between math proficiency and math self-efficacy is moderated by country mean math proficiency and this was found to be consistent across all four models even when measurement error and clustering were taken into account. Multilevel multidimensional mixture IRT modeling results support the hypothesis that low-performing groups within countries have a lower correlation between math self-efficacy and math proficiency. A weaker association between math self-efficacy and math proficiency in lower achieving groups is consistently seen across countries. A multilevel mixture IRT modeling approach sheds light on how this pattern emerges from greater randomness in the responses of lower performing groups. The findings from this study demonstrate that advanced modeling techniques not only are more appropriate given the characteristics of the data, but also provide greater insight about the patterns of relationships across countries
Thesis (PhD) — Boston College, 2021
Submitted to: Boston College. Lynch School of Education
Discipline: Educational Research, Measurement and Evaluation
Jauzac, Mathilde. "Cosmological constraints : from the cosmic infrared background measurement to the gravitational lensing in massive galaxy clusters". Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10096.
Texto completoThe principal thematic of my thesis work is the evolution and the formation of structures as a function of the redshift.My thesis analysis can be separated un two distinct parts, which can finally be merged in a third part with my last works.Firstly, I studied the evolution of the Cosmic Infrared Background (CIB) as a function of redshift at 70 and 160 µm using data from the Spitzer Space Telescope. This analysis was performed in the GOODS & COSMOS fields by applying a stacking method.Secondly, I studied the mass distribtuion in massive galaxy clusters at high redshifts by using the gravitational lensign effect.I used optical data coming from the Hubble Space Telescope. The sample of galaxy clusters I used comes from a subsample of the MAssive Cluster Survey (MACS, PI:E. Ebeling) named the "high-z" sample, and which comprises 12 clusters.Understanding the state of evolution of galaxy clusters at high redshift wil allow us to put constraints on formation and evolution models of structures. The understanding of the evolution cycle of galaxy clusters is mandatory in terms of Observational Cosmology
Johnson, Evelyn Sue. "The effects of accommodations on large-scale performance assessments /". Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/7897.
Texto completoRezaie, Mehdi. "Robust Measurements of the Large-Scale Clustering of Galaxy Survey Data". Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1626320867298365.
Texto completoRezaie, Mehdi. "Robust Measurements of the Large-Scale Clustering of Galaxy Survey Data". Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1626320867298365.
Texto completoNance, Donald Kirby. "Separating contributions of small-scale turbulence, large-scale turbulence, and core noise from far-field exhaust noise measurements". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19768.
Texto completoCommittee Chair: Ahuja, Krishan K.; Committee Member: Cunefare, Kenneth; Committee Member: Lieuwen, Tim C.; Committee Member: Mendoza, Jeff; Committee Member: Sankar, Lakshmi.
Malan, Jan Gottlieb. "Flow resistance of large-scale roughness in mountain rivers of the Western Cape". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52850.
Texto completoENGLISH ABSTRACT: This investigation arose out of the pressing need for alternatives to ineffective existing methodologies for low flow measurement in boulder bed rivers, with particular focus on the mountain streams in the Western Cape. Both empirical and mathematical verification were regarded as important if progress was to be made towards identifying a suitable approach. Historically the inability to determine the frictional effect of the streambed on the flow rate has been a major obstacle limiting the accuracy of flow calculations. From literature, the most likely relationship appears to be a power function, utilising hydraulic variables derived from physical parameters characteristic of a section of stream. Local Western Cape data was thus collected from various typical mountain streams, so that relevant analysis could be done. Testing of existing equations from literature sources on this set of data revealed limited applicability. Subsequent empirical experimentation has shown that particle size is a dominant variable in determining boulder bed flow resistance under low flow conditions. A mathematical approach was sought to provide a more suitable base for a locally applicable formula. Sediment transport theory, based on simple power conservation laws, was successfully implemented, partially bridging the gap between the applications for sand bed and boulder bed flow conditions respectively. After a certain degree of empirical adjustment, an equation form was finalised that is believed to be the most suitable for Western Cape mountain streams, with definite potential for wider application, provided further research is done.
AFRIKAANSE OPSOMMING: Hierdie ondersoek spruit uit die dringende behoefte aan bruikbare alternatiewe vir bestaande laagvloei meetmetodes in riviere met bodems bestaande uit spoelklip, met spesifieke klem op die bergstrome van die Wes Kaap. Dit is as belangrik beskou om beide empiriese en wiskundige bevestiging te vind vir 'n verbeterde metode. Histories is die akkuraatheid van vloeitempo berekeninge hoofsaaklik beperk deur die onvoorspelbaarheid van die ruheidseffek van die rivierbodem op die vloei. Uit bestaande literatuur blyk dit dat die mees geskikte verwantskap waarskynlik 'n magsfunksie is, wat saamgestel is uit hidrouliese veranderlikes verkry vanaf fisiese parameters kenmerkend aan die spesifieke riviersnit. Plaaslike Wes-Kaapse data is dus versamelop verskeie tipiese bergstrome in die gebied sodat geskikte ontledings gedoen kon word. Verskeie bestaande formules is getoets teen hierdie stel data en ongeskik gevind vir direkte aanwending. Empiriese toetse het gevolg en getoon dat partikel grootte 'n dominante invloed het op die vloeiweerstand van spoelklip bodems onder laagvloei omstandighede. 'n Wiskundige benadering is daarna gevolg om 'n beter basis te verskaf waaruit 'n plaaslik bruikbare vergelyking kon volg. Sedimentvervoer beginsels, wat gebaseer is op basiese drywingsteorie, is suksesvol aangewend vir hierdie doel, en het in 'n mate die gaping tussen aanwending op sand en klip bodems oorbrug. Na afloop van empiriese verstelling is 'n formule gefinaliseer wat beskou word as die mees geskikte vir Wes-Kaapse bergstrome, maar wat ook die potensiaal besit vir wyer aanwending, mits verdere navorsing gedoen sou word.
Düdder, Andreas Christian [Verfasser]. "First Measurement of the Branching Ratio Fraction BR(W to tau nu to mu nu nu)/BR(W to mu nu) in sqrt(s) = 7 TeV Proton-Proton Collisions with the ATLAS Detector and Realization of a Production Facility for Large Scale Micromegas Drift Boards / Andreas Christian Düdder". Mainz : Universitätsbibliothek Mainz, 2019. http://d-nb.info/1202729908/34.
Texto completoLi, Xin. "Multidimensionality and item parameter drift an investigation of linking items in a large-scale certification test /". Diss., Connect to online resource - MSU authorized users, 2008.
Buscar texto completoTitle from PDF t.p. (viewed on July 21, 2009) Includes bibliographical references (p. 111-120). Also issued in print.
Brown, Donald Wesley. "The role of reading in science : validating graphics in large-scale science assessment /". view abstract or download file of text, 2007. http://proquest.umi.com/pqdweb?did=1421603591&sid=3&Fmt=2&clientId=11238&RQT=309&VName=PQD.
Texto completoTypescript. Includes vita and abstract. "This study was conducted during the fall of 2006 in 22 schools in the Pacific Northwest. Participants included 868 students from 59 fifth-grade classrooms"--P. v. Includes bibliographical references (leaves 113-120). Also available for download via the World Wide Web; free to University of Oregon users.
Brown, Laureen Kay. "Out-of-level testing for special education students participating in large-scale achievement testing: A validity study". Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280401.
Texto completoFishbein, Bethany. "Preserving 20 Years of TIMSS Trend Measurements: Early Stages in the Transition to the eTIMSS Assessment". Thesis, Boston College, 2018. http://hdl.handle.net/2345/bc-ir:107927.
Texto completoThis dissertation describes the foundation for maintaining TIMSS’ 20 year trend measurements with the introduction of a new computer- and tablet-based mode of assessment delivery—eTIMSS. Because of the potential for mode effects on the psychometric behavior of the trend items that TIMSS relies on to maintain comparable scores between subsequent assessment cycles, development efforts for TIMSS 2019 began over three years in advance. This dissertation documents the development of eTIMSS over this period and features the methodology and results of the eTIMSS Pilot / Item Equivalence Study. The study was conducted in 25 countries and employed a within-subjects, counterbalanced design to determine the effect of the mode of administration on the trend items. Further analysis examined score-level mode effects in relation to students’ socioeconomic status, gender, and self-efficacy for using digital devices. Strategies are discussed for mitigating threats of construct irrelevant variance on students’ eTIMSS performance. The analysis by student subgroups, similar item discriminations, high cross-mode correlations, and equivalent rankings of country means provide support for the equivalence of the mathematics and science constructs between paperTIMSS and eTIMSS. However, the results revealed an overall mode effect on the TIMSS trend items, where items were more difficult for students in digital formats compared to paper. The effect was larger in mathematics than science. An approach is needed to account for the mode effects in maintaining trend measurements from previous cycles to TIMSS 2019. Each eTIMSS 2019 trend country will administer the paper trend booklets to an additional nationally representative bridge sample of students, and a common population equating approach will ensure the link between paperTIMSS and eTIMSS scores
Thesis (PhD) — Boston College, 2018
Submitted to: Boston College. Lynch School of Education
Discipline: Educational Research, Measurement and Evaluation
Lawrence, John. "Cross-shore morphodynamics of coarse grained beaches and beach/structure interaction : numerical modelling and large scale measurements". Thesis, University of Plymouth, 2005. http://hdl.handle.net/10026.1/1133.
Texto completoRamos, Tercero Elia Armandina. "LARGE SCALE PRODUCTION OF BIOCRUDE FROM MICROALGAE: EXPERIMENTAL MEASUREMENTS AND PROCESS SIMULATIONS TO ASSESS ITS ECONOMIC VIABILITY". Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424656.
Texto completoI biocarburanti provenienti da biomassa microalgale sono considerati come una delle alternative migliori e più a breve termine per produrre energia pulita. Le microalghe sono microorganismi capaci di convertire l’energia solare in energia chimica che può essere sfruttata come combustibili di diverse tipologie sia liquida sia gassosa. L’obiettivo della ricerca presentata in questa Tesi é di valutare il potenziale della tecnologia per la produzione di olio da microalghe, analizzando diverse alternative e concetti sia in modo sperimentale che tramite simulazioni del processo. Il Capitolo 1 é una discussione introduttiva sulla situazione mondiale delle microalghe, recenti studi e gli ultimi risultati riportati su questa tecnologia. Dal punto di vista sperimentali, nei Capitoli 2 e 3 di questa tesi si sono approfonditi, la coltivazione di microalghe in acque reflue e la capacità che presentano alcune specie di microalghe di crescere in acque reflue non trattate, verificata con la microalga Chlorella protothecoides. La crescita é stata valutata in acque provenienti da diversi step del di trattamento delle acque, per selezionare la stream ottimale per la crescita delle microalghe. Inoltre, é stata testata la efficienza nella rimozione di nutrienti e i tassi di rimozione in acque reflue reali. Nel Capitolo 2 si riportano anche la produzione di biomassa in stato stazionario con alimentazione continua del effluente. Nel Capitolo 3 sono stati studiati gli effetti della temperatura, l’irradiazione in ciclo giorno/notte e la competizione batterica sulla crescita di C. protothecoides, e la rimozione dei nutrienti con l’obiettivo d’integrare entrambe tecnologie in un approccio realistico. É stato infine proposto uno schema modificato dell’impianto di depurazione. Il Capitolo 4 presenta il lavoro sperimentale per la valutazione della capacità di produzione di biogas da microalghe e le loro velocità di degradazione nel processo di digestione anaerobica: sono state testate diverse condizioni come la tipologia del’inoculo batterico e la concentrazione della biomassa algale all’inizio delle prove. Inoltre, questo capitolo riporta anche la ricerca nel recupero del contenuto energetico dalla biomassa residua dopo l’estrazione di olio, dimostrando che il metodo di estrazione dell’olio é un fattore importante. La produzione di biogas e sua corrispondente frazione di metano sono stati testati considerando l’effetto della miscela di solvente usato nella estrazione, e i risultati sono stati confrontati con quelli della biomassa microalgale prima della estrazione. Il Capitolo 5 é focalizzato sulla conversione di biomassa mediante il processo di liquefazione idrotermica (HTL) che viene svolto a temperature tra 200 C e 375 C (la pressione é quella necessaria per mantenere l’acqua in stato liquido), ed é caratterizzato da alte rese. Tuttavia, uno dei sottoprodotti é una fase acquosa con alto contenuto di componenti organici che deve essere trattata adeguatamente per evitare ulteriori costi. In questo capitolo si riporta il lavoro sperimentale svolto con l’obiettivo di recuperare e riutilizzare l’acqua di processo mediante un riciclo nel sistema stesso. Inoltre si é misurato l’effetto della temperatura e del numero di ricicli nelle rese di produzione di olio, gas, residuo solido e la fase acquosa e la composizione dei prodotti. Nel Capitolo 6 si riporta l’analisi energetica del processo per la produzione di biocrudo: lo studio é stato svolto considerando diverse tipologie e condizioni di processo, i quali sono stati modellati e simulati dal simulatore di processo Aspen PlusTM, col fine di verificare e ottimizzare i profitti energetici rispetto all’analisi del EROEI, e di proporre un processo energeticamente autosufficiente. Dei diversi processi studiati per ottenere energia della biomassa quello che utilizza la combustione di biomassa dopo estrazione dell’olio é risultato il più favorevole in termini energetici. In particolare, due casi di questo processo sono stati confrontati con un caso base, variando la provenienza dei requisiti energetici (calore ed elettricità), fornendoli sia da fonti esterne che dal processo steso. In ultimo, nel Capitolo 7 si riporta una valutazione tecnica di un impianto per la produzione di biodiesel da microalghe in cui si propone una nuova configurazione della sezione di crescita, un fotobioreattore ibrido, il Closed Pond Reactor (CPR). L’intero processo é stato simulato Aspen PlusTM e ottimizzato per ottenere i migliori benefici in termini energetici. La progettazione e il dimensionamento delle attrezzature tecnologiche sono stati effettuati per ottenere una stima realistica dei costi, considerando sia CAPEX (costi di capitale) e OPEX (costi operativi). Nell’analisi economica si é valutata, la redditività del processo su scala industriale e sono stati calcolati i prezzi di vendita corrispondenti dell’olio e del biodiesel necessario per rendere la produzione economicamente sostenibile.
Liu, Mingyang Liu. "Differential Item Functioning in Large-scale Mathematics Assessments: Comparing the Capabilities of the Rasch Trees Model to Traditional Approaches". University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1513266587329066.
Texto completoJayasinghe, Indika D. "An automated approach to create, manage and analyze large- scale experiments for elastic n-tier application in clouds". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49098.
Texto completoHorst, Sonia Jeanne. "A mixture-modeling approach to exploring test-taking motivation in large-scale low-stakes contexts /". Full-text of dissertation on the Internet (1.26 MB), 2010. http://www.lib.jmu.edu/general/etd/2010/doctorate/horstsj/horstsj_doctorate_04-15-2010.pdf.
Texto completoTatang, Dennis [Verfasser], Thorsten [Gutachter] Holz y Jörg [Gutachter] Schwenk. "Large-scale measurements for enhancing network security / Dennis Tatang ; Gutachter: Thorsten Holz, Jörg Schwenk ; Fakultät für Elektrotechnik und Informationstechnik". Bochum : Ruhr-Universität Bochum, 2021. http://d-nb.info/1233484206/34.
Texto completoBroadhead, Dawn. "Large scale entrance surface dose survey and organ dose measurements during diagnostic radiology using the Harshaw 5500 and 6600 TLD systems". Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366517.
Texto completoÖstlin, Erik. "On Radio Wave Propagation Measurements and Modelling for Cellular Mobile Radio Networks". Doctoral thesis, Karlskrona : Blekinge Institute of Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00443.
Texto completoHoyt, Kristin. "Teacher voice and participation in shaping large-scale standards-driven testing : the case of teacher involvement in the design and construction of a third year high school French end-of-course exam, based on The Indiana Academic Standards for Foreign Languages /". [Bloomington, Ind.] : Indiana University, 2005. http://wwwlib.umi.com/dissertations/fullcit/3202896.
Texto completoMIURA, YOKO. "HIGH-STAKES TEST PERFORMANCE OF LIMITED ENGLISH PROFICIENT STUDENTS IN OHIO". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163696263.
Texto completoHorvath, Istva'n. "Extreme PIV Applications: Simultaneous and Instantaneous Velocity and Concentration Measurements on Model and Real Scale Car Park Fire Scenarios". Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209641.
Texto completoIn this actual chapter 1 general introduction is given to each chapter. Chapter 2 is dedicated to a detailed description of the instantaneous and simultaneous velocity and concentration measurement technique and its associated error assessment methodology. The name of the new technique is derived from the names of the acquired parameters (VELocity and COncentration) and shall be hereafter referred to as VELCO. After having validated and performed an error assessment of this technique, it is applied to an investigation of full-scale car park (30 m x 30 m x 2.6 m – Gent / WFRGENT) fire cases in chapter 3. The measurements were carried out with the financial support of IWT-SBO program. In the full-scale measurements only the velocity part is applied of VELCO, yet it can be considered as its application since the special data treating was developed and implemented in the Rabon (see: §2.1.2) program, which is the software of the new technique along with Tucsok (see: §2.1.1) and they will be both discussed in the related chapter. Here it is enough to mention that the concentration and velocity information can be obtained independently as well. During the full-scale measurements, beyond of VELCO the smoke back-layering distances (SBL) are also derived from the temperature values, which were measured by thermocouples under the ceiling in the midline of the car park. The critical velocity, which is an important measure of fire safety, can be obtained from the SBL results. In chapter 4, isothermal fire modeling is surveyed in order to present how full-scale fires are modeled in small-scale. In this part of the study the theory of fire related formulae and an isothermal model are described. Here it is important to stress the fact that the fire modeling is not directly related to the VELCO technique. However it connects the full-scale to the small-scale measurements, which the technique is applied on. Chapter 5 discusses small-scale measurements (1:25 – Rhode Saint Genese / VKI) on the car park introduced in chapter 3 and their validation. After the validation, more complex car parks scenarios are also investigated due to the easy to change layout in the small-scale model with respect to the full-scale car park. In this chapter the smoke back-layering distances are obtained by VELCO. Finally, in chapter 6 important conclusions are drawn with the objective of increasing fire safety.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Song, Han Hee 1978. "Large-scale network analytics". 2011. http://hdl.handle.net/2152/18175.
Texto completotext
"large-scale circulation in turbulent thermal convection". Thesis, 2007. http://library.cuhk.edu.hk/record=b6074356.
Texto completoIt is found in Gamma = 1 cells the azimuthal motion consists of erratic fluctuations and a time-periodic oscillation. While in Gamma = 1/2 cells, this kind of oscillation is missing. An intriguing dynamic feature of the LSC is the apparently erratic large orientational change of its nearly vertical circulation plane, which is called reorientation. The occurrence of the reorientations are both Poisson process for the Gamma = 1 and 1/2 geometries. We found that the azimuthal motion of LSC is more confined in larger Gamma geometry, and this property can be used to interpret the so-called bimodality of heat transport.
The reversal of the flow direction of the LSC in RB system resembles a lot of reversal phenomena and is the interest of several theoretical models. We found, in Gamma = 1/2 geometry, that there are an order of magnitude more cessations and reversals than that in Gamma = 1 geometry, which contrasts sharply to the finding in Gamma = 1 geometry. Thus in Gamma = 1/2 cells a statistically significant number of unambiguously identified pure reversal events are obtained, which allow us to analyze several important properties of pure reversal events. It is found that the occurrence of reversals is a Poisson process and that a stronger rebound of the flow strength after a reversal/cessation leads to a longer period of stability of the LSC. Several properties of reversals/cessations in this system are found to be statistically similar to those of geomagnetic reversals.
We found in all the aspect ratios explored(Gamma = 1, 1/2 and 1/3) both single circulating roll flow structure and two vertically stacked counter-rotating rolls structure exist. The average percentage of time that the flow spends in the single-roll mode (SRM) is decreasing with Gamma while that of the double-roll mode (DRM) is increasing with Gamma. Several routes of transitions among the different flow modes are identified. We also show direct evidence that the SRM is more efficient for heat transfer than the DRM. It is also found that the time interval between successive flow mode transitions has an exponential distribution, suggesting a Poisson process for the underlying dynamics.
Xi, Hengdong = 熱湍流中的大尺度環流 / 郗恒東.
"July 2007."
Adviser: Ke-Qing Xia.
Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0386.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2007.
Includes bibliographical references (p. 144-153).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.
Xi, Hengdong = Re tuan liu zhong de da chi du huan liu / Xi Hengdong.
Bo-TaiShih y 施博泰. "Research of Photogrammetry in Large Scale Movable Bed Terrain Measurement". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/24028557114569052265.
Texto completo國立成功大學
水利及海洋工程學系碩博士班
98
Sand drift test were used to simulate the near-shore terrain change due to coastal structures constructed. A decrease-sized modeling tests needs higher measuring accuracy to prevent error bloom when it’s transformed to on-the-scene size. One way to get rid of error bloom was using larger testing site. Unfortunately, high accuracy terrain measuring device were with difficulty to fit its specifications when it’s used in a large-scale sand drift testing site(150m*60m*1.5m). Here we introduce photogrammetry combine with commercial software Australis and XY-car at the testing site to examine the performance of photogrammetry using in terrain measurement of sand drift test that including the accuracy, time taking, topography detail, and find any adaptive problems then solved. It shows that the accuracy of Z-axis is better than 3mm. When estimating the time it takes in a 30m*40m testing site, only about 3 hours is needed than two days compared with recession water method which is used to be the only way in median-scale or large-scale sand drift test terrain measurement. Photogrammetry shows better sensitivity in topography detail because of the evenly spread located points. In addition, it can be use in different size testing site just change the focal length of lens. It’s no needed to pre-calibration your camera and lens is bonus of photogrammetry, and you can use several cameras at a time. One possible application of photogrammetry is the curved surface construction of an object, it might be a way for further research thinking.
Tsai, Szu-Che y 蔡世哲. "The Research and Measurement of Large Scale Inductively Couplied Plasma". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/65908860970303356694.
Texto completo"Large Scale Analytical Insights of Email Communication Patterns". Master's thesis, 2011. http://hdl.handle.net/2286/R.I.9485.
Texto completoDissertation/Thesis
M.S. Computer Science 2011
Wu, Jung-Feng y 吳榮峰. "Application of Large-Scale Particle Image Velocimetry for Water-Surface Velocity Measurement". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/96714237041680631288.
Texto completo國立成功大學
水利及海洋工程學系碩博士班
91
The purpose of this study is using experiment way to inquire into large-scale particle image velocimetry (LSPIV), and analyze the feasibility and accuracy for large-scale water surface velocity fields. So we choose this two experiment scales to discuss. The experiment is taking advantage of digital camera to select the images of water surface between this two experiment scales. After digitalize processing, applying to image enhanced techniques to deal with, then loading the processed images into the program (Lee, 2003) which is making the cross-correlation analysis. So we can get two-dimension instantaneous velocity fields, and select 1 sec time-average for continuous two-dimension instantaneous velocity fields. Through this research we can know, the images we pick from outdoor, which using Homomorphic filter and Medium filter to process. After making the cross-correlation analysis, we obtain more effective instantaneous water surface velocity fields. But it’s hard to avoid miss judging for velocity vectors. Undergo applying Medium filter to deal with velocity fields, we can get more better effect. In addition, this two experiment scales of spacial scale correction errors are less than 2.5 %, the diversities of single-point velocity comparison are all within 7.5 %, the diversities of spacial average velocity comparison are all within 8 %. And the analysis results conform to suffer the appearance of secondary flow effect influence. For this reason, it proves using LSPIV to analyze large-scale water surface velocity fields is a feasibility, effective and reliability remote technique.