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Ion, Adina Izabela. "Computer aided detection and measurement of peripheral arterial diseases from CTA images." Thesis, Kingston University, 2013. http://eprints.kingston.ac.uk/26273/.
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Peripheral Arterial Disease (pAD) afflicts more than 2.7 million people in the U.K. per year, and it is projected to increase rapidly within the current decade. PAD is a product of obstruction (stenosis or occlusion) of vessels feeding the body's extremities, and it is most often encountered in the lower extremities. Treatment of the disease is dependent on the specific anatomic segments afflicted, the degree of stenosis and its length. A common technique for imaging PAD is Computed Tomography-Angiography (CTA). The acquired CTA images are then investigated by a radiologist for disease assessment. However due to the large size of the PAD CTA datasets (1000-2000 slices) the radiologist's examination is time consuming and laborious. This project brings a contribution to the investigation of PAD in CTA datasets by the development of a tool for the radiologist, a fully automatic system for the detection and measurement of PAD, as currently there are no such systems efficacious for the disease. The proposed system is comprised of two components: a Computer Aided Detection (CAD) component and a Computer Aided Measurement (CAM) component. The CAD component is designed for artery segmentation and stenosis detection. The stage of artery segmentation is accomplished by using a 3D region growing method and an innovative 3D fast morphology operation. CAD methodologies commonly employ morphological operations as a tool in the segmentation process, along with extended series of CTA images. This large dataset requires careful attention to be paid towards optimizing the computational process in terms of time efficiency. In order to meet this goal, an optimized morphology algorithm is presented, which reduces the computation time by a factor of 10. A skeletonization based centreline technique is applied on the detected artery, and it then provides the basis for the measurement stage. Orthogonal planes to the centreline are used in order to obtain cross sectional images. The artery profile is then built based on vessel areas measured in the cross sectional images and an automated process of stenosis detection is performed. The CAM component of the system accurately measures and quantifies the stenosis and overcomes the challenge brought by the partial volume effect. In this respect, a hybrid method for partial volume correction is employed locally, on the candidate areas of stenosis detected by the CAD component, based on Maximum a Posterior (MAP) and Markov Random Field (MRF) expectation maximization method. The CAD-CAM system has been successfully implemented and applied on phantom and patient data (twenty data sets from The University Hospital of Lausanne (CHUV)) and the evaluation was carried out through the visual judgment of two experienced radiologists. Within the CAD component, the artery segmentation was evaluated and a total of 15 peripheral arterial trees were correctly extracted. The proposed stenosis detection method was evaluated on 525 arterial segments (each dataset was partitioned into 35 segments) from which 132 exhibited stenosis caused by soft plaque. The system achieved a sensitivity of 88% and a specificity of 96%. The CAM component has been evaluated using phantom data, and the average error of the diameter measurement was 8%.
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Parsons, Robert Daniel. "Towards a measurement of the cosmic ray electron spectrum at the highest energies, using the next-generation Cherenkov Array CTA." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588755.
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The highly relativistic particles that arrive at the Earth, the long studied yet enigmatic cosmic rays, include >TeV electrons as well the dominant protons and nuclei. As during their diffusion in the interstellar medium these electrons undergo severe energy losses through both synchrotron and inverse Compton processes they are hence only able to travel relatively short distances. Therefore measurement of the spectrum of these electrons is able to give an important insight into the local distribution of cosmic ray sources. The use of IACTs to measure the highest energy electrons has already been pio- neered with the current generation of instruments such as HESS. This thesis describes the steps required to build upon these results and produce a measurement of the highest energy (>10 TeV) electrons, by use of the next generation ground-based gamma-ray telescope the Cherenkov Telescope Array. The first step in this process was the investigation of the systematic uncertainties in the modelling of high energy hadronic interactions and the resulting effect on the observable properties of the resulting air shower. This investigation was followed by the development of a new IACT event analysis chain, including improvements to both the event reconstruction and background rejection. The point source sensitivity of CTA candidate arrays could be increased up to 30% compared to the traditional chain. This chain was then applied to cosmic electrons and the sensitivity of CTA to electrons was determined. A simple semi-analytical model was then produced to demonstrate that signatures in the high energy electron spectrum from local sources are highly likely and should be observable with CTA at a high significance level
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Lajza, Ondřej. "Optimalizace chladicího systému letounů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-370742.
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Dissertation thesis is focused on the aircraft cooling system optimization. The knowledge of the pressure loss is necessity for design of an optimal system. In the beginning of the thesis, the different designs of piston engine cooling systems are described for both aircrafts and automobiles. Other sections outline the determination of the coolers characteristics and describe the different test sections applicable for the characteristics measurement. The test section built at the Institute of the aerospace engineering is described as well. Practical part of the thesis describes the calibration of the test section. The measurements of the specific coolers were compared with the CFD simulation of two models - the simplified cooler model and cooler element model. Additionally, the measurements were compared with results obtained at specialized coolers testing facility.
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Widell, Lars M. "Essays in International Trade : Measurement, Product Quality, Input-Output Modelling and Tax Evasion." Doctoral thesis, Örebro universitet, Handelshögskolan vid Örebro Universitet, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-52678.
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This thesis consists of four independent essays that deal with several measurement aspects within the field of international trade. The measurement problems addressed are related to measuring the human capital content of trade in exports relative to imports or measuring tax evasion Essay 1, The Human Capital Content of Trade and its Measurement. Evidence from Swedish Data, deals with various measurement problems related to calculations of the human capital content of trade in exports relative to imports. This builds on the Heckscher-Ohlin-Vanek extension to the Heckscher-Ohlin trade theory. Essay 2, Product Quality Adjustment and the Human Capital Content of Trade. A New Computational Framework, builds on the same theoretical background, but introduces a quality-adjustment in the calculations of the human capital content of trade in exports relative to imports, which builds on the idea underlying vertical intra-industry trade (VIIT). Quality adjustment is performed, first, by assuming that a product sold at a higher price has a higher quality than the same product sold at a lower price and, second, by assuming that a highquality product implies a higher content of skilled labour than a low-quality product. Essay 3, Estimation of commodity-by-commodity input–output matrices, focuses on a new method in constructing symmetric input-output tables (SIOTs), which has been termed the Bohlin and Widell model, using data contained within supply- and use-tables (SUTs). One key contribution is that it makes it possible to estimate SIOTs in cases when the underlying SUTs are rectangular. The method also addresses the problem of negative coefficients, a long-standing issue encountered in the derivation of SIOTs. Essay 4, Tax evasion in Kenya and Tanzania: Evidence from missing imports, focuses on estimating the amount of tax evasion in trade between Kenya and Tanzania. The study is empirically focused, and the measurement errors in reported trade flows between both countries are correlated with tax rates, to determine whether the measurement error increases with the tax rate.
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Jankowsky, David [Verfasser], Stefan [Akademischer Betreuer] Funk, and Stefan [Gutachter] Funk. "Measurement of the Cosmic Ray Proton Spectrum with H.E.S.S. and Characterization of the TARGET ASICs for the CTA / David Jankowsky ; Gutachter: Stefan Funk ; Betreuer: Stefan Funk." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2020. http://d-nb.info/122008123X/34.
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Šeda, Libor. "Analýza proudění z vyústky osobního vozu s využitím termoanemometrické sondy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231972.
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In this master’s thesis there are summarized fundamental findings about air flow velocity measurements and afterwards introduced the measuring track for automobile car vents, measured object and track arrangement and all used components. Velocity field measurement method is how wire anemometry, and apart from 4 main cases measurements of free air jet, there are velocity profiles in piping measured as an input for CFD simulation. Air vent evaluation criteria are described and their assessment is done for specified cases. Further, there is a CFD simulation presented with comparison to experimental data. Uncertainty of flow rate measured and flow rate setting is determined. Improvement points and encountered issues are presented. Visualization and evaluation program coded in MATLAB environment enables easy data display of CTA results and will serve further vent quality assessment.
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CAVALCANTI, Tony Carlos Moura. "Anemometria térmica aplicada à hidrometria em regime de submedição." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1574.
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Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-08-28T20:29:05Z
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TONY CARLOS MOURA CAVALCANTI – TESE (PPGEEI) 2016.pdf: 4469755 bytes, checksum: 884382b3c566b4aca499dc522be900ab (MD5)Made available in DSpace on 2018-08-28T20:29:05Z (GMT). No. of bitstreams: 1 TONY CARLOS MOURA CAVALCANTI – TESE (PPGEEI) 2016.pdf: 4469755 bytes, checksum: 884382b3c566b4aca499dc522be900ab (MD5) Previous issue date: 2016-12-12
CNPq
O objetivo neste trabalho é propor um sistema para a hidrometria na faixa de submedição utilizando a anemometria térmica. O objetivo de medir vazão está presente em muitos campos da ciência, sendo necessário sabermos quais os valores de um material foram consumidos com o menor erro possível. Na primeira parte da pesquisa foram realizadas simulações em ambiente multifísico para identificar as condições de trabalho e possíveis pontos de localização do sensor. Para poder usar o sensor, é necessário conhecer valores limítrofes de trabalho do mesmo, ou seja, a faixa de operação, indicando assim a vazão mínima e máxima de operação do sensor anemométrico. Portanto, na segunda etapa do trabalho, foi proposta uma plataforma com um sistema de bombeamento para testar o sistema de medição proposto. A plataforma foi construída de modo a permitir que um fluído flua através de uma tubulação e, assim, determinar qual é a velocidade do fluído e, portanto, a vazão.
The objective of this work is to propose a system for the hydrometry in the sub-measurement range using thermal anemometry. The objective of measuring flow is present in many fields of science, it is necessary to know what values of a material were performed using COMSOL software to identify working conditions and maximum flow rate of the anemometric sensor. Therefore, in the second stage of the work, a platform with a pumping system was proposed in order to test the proposed measurement system. The platform was constructed so as to allow a fluid to flow through a pipeline, and thereby determine what the velocity of the fluid, and hence the flow, is.
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Singhal, Rajat, and Nicolas Berlinger. "How to bell the cat named Social Impact Measurements : Challenges and Limitations in setting up Social Impact Measurement." Thesis, KTH, Industriell Marknadsföring och Entreprenörskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230924.
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Social Entrepreneurship and Social Enterprises are an emerging trend. An increasing number of individuals are finding ways to address a social issue through their entrepreneurial skills. As well as increasing number of corporations and investing organizations are looking for ventures that address a social issue to fulfill their social responsibility. Thus, it is increasingly becoming important for the social entrepreneurs to measure and report their impacts to society in an accurate way. This research seeks to find out the challenges faced by social entrepreneurs while setting up social impact measurements in their ventures and the solutions adopted by them. Through a series of semi‐structured interviews with successful social entrepreneurs, this research collects qualitative data that increases the knowledge in this area and contributes in a better understanding of the challenges faced by social entrepreneurs. This research found that Theory Of Change is the most commonly used method and is preferred by practitioners as it is easy to implement. The research summarises the efforts it takes to implement the measurements, recommends best practices or advice to make impact measurement easier and useful. Also, a framework is developed that can be used in setting up measurements in a social venture.
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Ležovič, Tomáš. "Experimentální analýza proudu vzduchu z ofukovače osobního vozu s využitím žárového anemometru a návrh hodnocení kvality ofukovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229643.
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The master’s thesis deals with air flow in the interior of automobile Škoda Octavia. The attention is focused only at a side ventilating outlet. Author’s effort was to propose the appropriate criteria for evaluation and assessment of ventilating outlet quality and elaborate the methodology of measurement for these criteria. Then follows the application of the methodology and measurement of velocity field of air flow from the outlet by the method of hot wire anemometry. The thesis also contains comparison of the results with the results attained by the smoke visualization.
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Wusik, Katie. "CCA Measurement of Cultural Competency in a Genetic Counseling Student Population." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179376187.
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Ramothlale, Elizabeth Faith. "An investigation into the appropriateness of the current assessment model continuous assessment (CASS) and common task for assessment (CTA) for the general education and training band." Pretoria : [s.n.], 2010. http://upetd.up.ac.za/thesis/available/etd-04072010-121044.
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Bailey, Gearle R. "LDA and CTA in-cylinder measurements of intake-generated turbulence for steady flow around a centrally located valve." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2250.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains xv, 110 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 43).
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Shaghaghi, Mehran. "Topics in quantum physics: Schrodinger's cat problem - time measurement accuracies in quantum mechanics." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/204.
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In this thesis I address two different topics in quantum theory. The first one is the long discussed Schrodinger's cat problem, and the issues related to having a macroscopic superposition state. I show that the quantum theory provides full explanation to the problem. In the second part, I discuss the time measurement related issues in quantum mechanics. Since there does not exist any time operator in quantum mechanics generally, time is not directly measurable. Therefore we should devise other methods to register time. We study different time-energy relations and will find that accurate clocks have high energy uncertainties. If we use accurate clocks in quantum systems to observe their time evolutions, their high energy uncertainties interfere with system's normal evolution and slows it down. I also provide a formal proof to a previously suggested limiting accuracy relation on the measurements of the time-of-arrival experiments.
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Bedford, Lee. "Measurement Invariance of a Posttraumatic Stress Disorder Symptoms Measure (PCL-5) in College Student and Amazon's Mechanical Turk Samples." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707346/.
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College student and Amazon's Mechanical TURK (MTURK) samples are regularly utilized in trauma research. Recent literature, however, has criticized these samples for not being generalizable to the general U.S. population. Measurement invariance (MI) using confirmatory factor analyses (CFA), is rarely utilized in trauma research, even though the analysis can determine whether groups are invariant across factor structure, factor loadings, item intercepts, and residual error variances on a given measure of PTSD symptom severity. The purpose of this study was to determine whether college student (n = 255) and MTURK (n = 316) samples are invariant on the PCL-5. Model fit indices indicated the 7-factor Hybrid model was the best fitting model, but the 6-factor anhedonia model was the most parsimonious model. Both models demonstrated equivalence in factor structures (configural invariance), factor loadings (metric invariance), intercepts (scalar invariance), and residuals (strict invariance), indicating MTURK and college student samples are similar in regards to PTSD symptom severity. These findings provide evidence that these groups can be combined in future studies to increase sample size for trauma research. Only the Anhedonia factor exhibited mean differences between groups, which may be related to true differences between college students and MTURK survey-takers. Thus, there is further evidence that the findings from trauma studies using these populations are generalizable to each other.
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Francis, Kyle Andrew. "Measurement of the Feline Hippocampus Using Magnetic Resonance Imaging." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306861337.
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Wood, Alexander James Telfer. "Measurement and mechanisms of complement-induced neutrophil dysfunction." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289984.
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Critical illness is an aetiologically and clinically heterogeneous syndrome that is characterised by organ failure and immune dysfunction. Mortality in critically ill patients is driven by inflammation-associated organ damage and a profound vulnerability to nosocomial infection. Both factors are influenced by the complement protein C5a, released by unbridled activation of the complement system during critical illness. C5a suppresses antimicrobial functions of key immune cells, in particular the neutrophil, and this suppression has been shown to be associated with poorer outcomes amongst critically ill adults. The intracellular signalling pathways which mediate C5a-induced neutrophil dysfunction are incompletely understood, and scalable tools with which to assess immune cell dysfunction in patients are lacking. This thesis aimed to develop tools with which to assess neutrophil function and delineate intracellular signalling pathways driving C5a-induced impairment. Neutrophils were isolated from healthy volunteer blood and functions (priming, phagocytosis and reactive oxygen species production) were assessed using light microscopy, confocal microscopy and flow cytometry. A new assay was developed using an Attune Nxt™ acoustic focusing cytometer (Life Technologies) which allowed the rapid assessment of multiple neutrophil functions in small samples of unlysed, minimally-manipulated human whole blood. Complete proteomes and phosphoproteomes of phagocytosing neutrophils were obtained from four healthy donors pre-treated with C5a or vehicle control. Several key insights were gained from this work and are summarised here. Firstly, C5a was found to induce a prolonged (greater than seven hours) impairment of neutrophil phagocytosis. This defect was found to be preventable by previous or concurrent phagocytosis, indicating common signalling mechanisms. Secondly, a novel assay was developed which allows the rapid assessment of multiple neutrophil functions in less than 2 mL of whole blood, and this assay can feasibly be applied in clinical settings. Thirdly, cell-surface expression of the C5a receptor was found to be markedly decreased during phagocytosis, and this decrease was not mediated by protease activity. Finally, unbiased proteomics quantified 4859 proteins and 2712 phosphoproteins respectively. This quantification is the deepest profile of the human neutrophil proteome published to date, and has revealed novel insights into the mechanisms of C5a-induced neutrophil dysfunction and phagocytosis.
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Johansson, Peter. "Plant Condition Measurement from Spectral Reflectance Data." Thesis, Linköping University, Computer Vision, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-59286.
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The thesis presents an investigation of the potential of measuring plant condition from hyperspectral reflectance data. To do this, some linear methods for embedding the high dimensional hyperspectral data and to perform regression to a plant condition space have been compared. A preprocessing step that aims at normalized illumination intensity in the hyperspectral images has been conducted and some different methods for this purpose have also been compared.A large scale experiment has been conducted where tobacco plants have been grown and treated differently with respect to watering and nutrition. The treatment of the plants has served as ground truth for the plant condition. Four sets of plants have been grown one week apart and the plants have been measured at different ages up to the age of about five weeks. The thesis concludes that there is a relationship between plant treatment and their leaves' spectral reflectance, but the treatment has to be somewhat extreme for enabling a useful treatment approximation from the spectrum. CCA has been the proposed method for calculation of the hyperspectral basis that is used to embed the hyperspectral data to the plant condition (treatment) space. A preprocessing method that uses a weighted normalization of the spectrums for illumination intensity normalization is concluded to be the most powerful of the compared methods.
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Kitching, Jolanda. "The measurement outcome equivalence of the career path appreciation (CPA) for employees from diverse cultural backgrounds." Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-03162005-151333.
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Thesis (M. Comm. (Economic and business science))-University of Pretoria, 2004.Summaries in English and Afrikaans. Includes bibliographical references. Available on the Internet via the World Wide Web.
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Huang, Gregory T. (Gregory Tsan-Kao). "Measurement of middle-ear acoustic function in intact ears : application to size variations in the cat family." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/79972.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (p. 189-196).
by Gregory T. Huang.
Ph.D.
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Abrahamsson, Pernilla. "Methodological aspects on microdialysis sampling and measurements." Doctoral thesis, Umeå universitet, Anestesiologi och intensivvård, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-37464.
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Background: The microdialysis (MD) technique is widely spread and used both experimentally and in clinical practice. The MD technique allows continuous collection of small molecules such as glucose, lactate, pyruvate and glycerol. Samples are often analysed using the CMA 600 analyser, an enzymatic and colorimetric analyser. Data evaluating the performance of the CMA 600 analysis system and associated sample handling are sparse. The aim of this work was to identify sources of variability related to handling of microdialysis samples and sources of error associated with use of the CMA 600 analyser. Further, to develop and compare different application techniques of the microdialysis probes both within an organ and on the surface of an organ. Material and Methods: Papers I and II are mainly in vitro studies with the exception of the No Net Flux calibration method in paper I where a pig model (n=7) was used to examine the true concentration of glucose and urea in subcutaneous tissue. Flow rate, sampling time, vial and caps material and performance of the analyser device (CMA 600) were examined. In papers III and IV normoventilated anaesthetised pigs (n=33) were used. In paper III, heart ischemia was used as intervention to compare microdialysis measurements in the myocardium with corresponding measurements on the heart surface. In paper IV, microdialysis measurements in the liver parenchyma were compared with measurements on the liver surface in association with induced liver ischemia. All animal studies were approved by the Animal Experimental Ethics Committee at Umeå University Sweden. Results: In paper I we succeeded to measure true concentrations of glucose (4.4 mmol/L) and Urea (4.1 mmol/L) in subcutaneous tissue. Paper II showed that for a batch analyse of 24 samples it is preferred to store microdialysis samples in glass vials with crimp caps. For reliable results, samples should be centrifuged before analysis. Paper III showed a new application area for microdialysis sampling from the heart, i.e. surface sampling. The surface probe and myocardial probe (in the myocardium) showed a similar pattern for glucose, lactate and glycerol during baseline, short ischemic and long ischemic interventions. In paper IV, a similar pattern was observed as in paper III, i.e. data obtained from the probe on the liver surface showed no differences compared with data from the probe in liver parenchyma for glucose, lactate and glycerol concentrations during baseline, ischemic and reperfusion interventions. Conclusion: The MD technique is adequate for local metabolic monitoring, but requires methodological considerations before starting a new experimental serie. It is important to consider factors such as flow rate, sampling time and handling of samples in association with the analysis device chosen. The main finding in this thesis is that analyses of glucose, lactate and glycerol in samples from the heart surface and liver surface reflect concentrations sampled from the myocardium and liver parenchyma, respectively.
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Wirth, Gilson Inacio. "SGC : um ambiente para a automação de procedimentos de caracterização e teste." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1994. http://hdl.handle.net/10183/25465.
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Este trabalho trata de ambientes de software para a realização de teste e caracterização de dispositivos, componentes ou circuitos eletro-eletrônicos, de forma automatizada. Ênfase especial é dada à problemática relacionada ao teste e caracterização automatizados de dispositivos e circuitos integrados. O assunto é tratado sob dois pontos de vista distintos e complementares: i) Sob o ponto de vista do engenheiro de teste e caracterização, que realiza experimentos físicos, que são as medidas e aquisições de dados, processa, visualiza e analisa dados. ii) Sob o ponto de vista do projetista de ferramentas de software, que desenvolve programas de computador para automatizar as tarefas rotineiramente realizadas durante o teste e a caracterização. Após a analise do assunto em questão, um ambiente de software (Framework), chamado SGC, é proposto e implementado. O SGC foi implementado em ambiente MS-WindowsTM através de um paradigma de orientação a objetos, e pretende atender as necessidades inerentes ao teste e caracterização automatizados, quando tratados sob os dois pontos de vista citados. O ambiente SGC é um sistema aberto, a fim de permitir o fácil acoplamento de novas facilidades, bem como mostra-se um sistema prático para suportar rotinas de teste e caracterização em laboratório.This work deals with software environments for automatic test and characterization of electro-electronical devices, components and circuits. Special attention is paid to the features of testing and characterizing integrated devices and circuits. The subject is treated in two different and complementary views: i) The needs of the test and characterization engineer are addressed. The test engineer carries out physical experiments, which embody measurements and data acquisitions, data processing, visualization and analysis. ii) The needs of the software tools developer, who develops computer programs for the automation of the procedures that are usually carried out during test and characterization, are also addressed. After the analysis of the subject under study, a software framework, called SGC ("Sistema de Gerenciamento e Controle"), is proposed and implemented. The SGC Framework was implemented under MS-WindowsTm using a object oriented approach. The SGC framework aims to fulfill the needs inherent to the automatic test and characterization, when treated using the approaches mentioned above. The SGC Framework is a open system, supporting the easy integration of new software functions to the environment, as well as a practical system for test and characterization laboratory routines.
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Guo, Yixing. "Fluorescence Detection of Biological Thiols." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/586.
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Glutathione (GSH) is an important biological thiol, it performs significant biological functions such as serving an antioxidant which protect cells from oxidative stress by trapping free radicals which damage DNA and RNA. It is known that abnormal plasma levels of GSH have been linked to various human diseases. Therefore, the rapid, sensitive and highly selective detection of GSH is of great importance for investigating its functions in diseases diagnosis. Interestingly, we found in cetyl trimethylammonium bromide (CTAB) medium, the resorufin-based probe shows an extremely fast, highly selective response to GSH. The result indicates that this dye can be employed to detect GSH in biological samples such as human plasma. Cysteine (Cys) is another important biological thiol which is involved in a variety of significant cellur functions, including protein synthesis, detoxication, and metabolic process, etc. Abnormal levels of Cys are related to many diseases, such as slowed growth, Alzheimer's disease and cardiovascular disease. Thus, the detection and quantification of Cys in physiological media is of great importance. In this thesis, I am going to present two organic fluorescent probes (Resorufin-based probe and SNF probe) for the detection and quantification of Cys. In addition, we prove that they can directly quantify Cys in human plasma. The chemical mechanisms involved in the detection of Cys are discussed.
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AL, SENAIDI YAQOOB SALIM. "EVALUATION OF THE ENGLISH AND MATHEMATICS COMPONENTSOF THE GENERAL FOUNDATION PROGRAM (GFP): OMANI UNIVERSITY STUDENTS’ LEARNING SATISFACTION OUTCOMES." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent157608179817989.
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Swartz, Horn Rebecca. "CT3 as an Index of Knowledge Domain Structure: Distributions for Order Analysis and Information Hierarchies." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3306/.
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The problem with which this study is concerned is articulating all possible CT3 and KR21 reliability measures for every case of a 5x5 binary matrix (32,996,500 possible matrices). The study has three purposes. The first purpose is to calculate CT3 for every matrix and compare the results to the proposed optimum range of .3 to .5. The second purpose is to compare the results from the calculation of KR21 and CT3 reliability measures. The third purpose is to calculate CT3 and KR21 on every strand of a class test whose item set has been reduced using the difficulty strata identified by Order Analysis. The study was conducted by writing a computer program to articulate all possible 5 x 5 matrices. The program also calculated CT3 and KR21 reliability measures for each matrix. The nonparametric technique of Order Analysis was applied to two sections of test items to stratify the items into difficulty levels. The difficulty levels were used to reduce the item set from 22 to 9 items. All possible strands or chains of these items were identified so that both reliability measures (CT3 and KR21) could be calculated. One major finding of this study indicates that .3 to .5 is a desirable range for CT3 (cumulative p=.86 to p=.98) if cumulative frequencies are measured. A second major finding is that the KR21 reliability measure produced an invalid result more than half the time. The last major finding is that CT3, rescaled to range between 0 and 1, supports De Vellis' guidelines for reliability measures. The major conclusion is that CT3 is a better measure of reliability since it considers both inter- and intra-item variances.
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Lolli, Jared. "Quantum Measurement and Feedback Control of highly nonclassical Photonic States." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC223/document.
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Ces dernières années, les progrès réalisés dans le contrôle de l'interaction lumière-matière au niveau quantique ont conduit à de nombreuses avancées en optique quantique, en particulier dans l'étude de phénomènes quantiques fondamentaux, dans la conception de systèmes quantiques artificiels et dans les applications en information quantique. Il a notamment été possible d'augmenter considérablement l'intensité de l'interaction lumière-matière et de contrôler le couplage de systèmes quantiques à leur environnement, afin d'obtenir des états non conventionnels et fortement non classiques. Cependant, pour exploiter ces états quantiques en vue d'applications technologiques, il est crucial de pouvoir mesurer et contrôler ces systèmes avec précision. Dans ce contexte, ce travail de thèse est consacré à l'étude de nouveaux protocoles pour la mesure et le contrôle de systèmes quantiques dans lesquels des fortes interactions et des symétries particuliers conduisent à la génération d'états fortement non classiques. Nous nous intéressons dans un premier temps au régime de couplage ultra-fort de l'électrodynamique quantique en cavité (et de circuit). Plus précisément, l'état de fondamental n'est plus le vide standard, car il devient énergiquement favorable qu'il contienne des photons.Dans ce régime on peut même obtenir des chat de Schrödinger comme état fondamental.En revanche, pour assurer la conservation de l'énergie, les photons contenus dans ce vide exotique sont liés à la cavité et ne peuvent pas s'échapper dans l'environnement. Cela signifie qu'ils ne peuvent être mesurés par simple photodétection. Nous proposons dans ce travail un protocole spécialement conçu pour surmonter cette difficulté. Nous montrons qu'il est possible de déduire les propriétés photoniques de l'état fondamental à partir du déplacement de Lamb d'un système à deux niveaux auxiliaire.Les résonateurs optiques à paires de photons constituent une autre classe de systèmes dans lesquels la symétrie de parité conduit à des états quantiques non conventionnels. Grâce à "l'ingénierie de réservoir", il est aujourd'hui possible de contrôler l'interaction d'un système avec son environnement, de façon à le stabiliser dans des états quantiques particulièrement intéressants. En particulier, quand un résonateur (une cavité optique) est couplé à l'environnement par échange de paires de photons, il est possible de créer de chats de Schrödinger optiques dans la dynamique transitoire du système. Les corrélations quantiques de ces états sont par contre rapidement perdues en raison de la présence inévitable de dissipation à un photon. Protéger le système contre cette perturbation est le but du protocole de feedback basé sur la parité que nous présentons dans cette thèseIn recent years, the field of quantum optics has thrived thanks to the possibility of controlling light-matter interaction at the quantum level.This is relevant for the study of fundamental quantum phenomena, the generation of artificial quantum systems, and for quantum information applications.In particular, it has been possible to considerably increase the intensity of light-matter interaction and to shape the coupling of quantum systems to the environment, so to realise unconventional and highly nonclassical states.However, in order to exploit these quantum states for technological applications, the question of how to measure and control these systems is crucial.Our work is focused on proposing and exploring new protocols for the measurement and the control of quantum systems, in which strong interactions and peculiar symmetries lead to the generation of highly nonclassical states.The first situation that we consider is the ultrastrong coupling regime in cavity (circuit) quantum electrodynamics.In this regime, it becomes energetically favourable to have photons and atomic excitations in the ground state, that is no more represented by the standard vacuum.In particular, in case of parity symmetry, the ground state is given by a light-matter Schrödinger cat state.However, according to energy conservation, the photons contained in these exotic vacua are bound to the cavity, and cannot be emitted into the environment.This means that we can not explore and control them by simple photodetection.In our work we propose a protocol that is especially designed to overcome this issue.We show that we can infer the photonic properties of the ground state from the Lamb shift of an ancillary two-level system.Another class of systems in which the fundamental parity symmetry leads to very unconventional quantum states is given by two-photon driven-dissipative resonators.Thanks to the reservoir engineering, it is today possible to shape the interaction with the environment to stabilize the system in particularly interesting quantum states.When a resonator (an optical cavity) exchanges with the environment by pairs of photons, it has been possible to observe the presence of optical Schrödinger cat states in the transient dynamics of the system.However, the quantum correlations of these states quickly decays due to the unavoidable presence of one-photon dissipation.Protecting the system against this perturbation is the goal of the parity triggered feedback protocol that we present in this thesis
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Sanguras, Laila Y. "Construct Validation and Measurement Invariance of the Athletic Coping Skills Inventory for Educational Settings." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984216/.
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The present study examined the factor structure and measurement invariance of the revised version of the Athletic Coping Skills Inventory (ACSI-28), following adjustment of the wording of items such that they were appropriate to assess Coping Skills in an educational setting. A sample of middle school students (n = 1,037) completed the revised inventory. An initial confirmatory factor analysis led to the hypothesis of a better fitting model with two items removed. Reliability of the subscales and the instrument as a whole was acceptable. Items were examined for sex invariance with differential item functioning (DIF) using item response theory, and five items were flagged for significant sex non-invariance. Following removal of these items, comparison of the mean differences between male and female coping scores revealed that there was no significant difference between the two groups. Further examination of the generalizability of the coping construct and the potential transfer of psychosocial skills between athletic and academic settings are warranted.
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Kalender, Ilker. "Effects Of Different Computerized Adaptive Testing Strategies On Recovery Of Ability." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613132/index.pdf.
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The purpose of the present study is to compare ability estimations obtained from computerized adaptive testing (CAT) procedure with the paper and pencil test administration results of Student Selection Examination (SSE) science subtest considering different ability estimation methods and test termination rules.
There are two phases in the present study. In the first phase, a post-hoc simulation was conducted to find out relationships between examinee ability levels estimated by CAT and paper and pencil test versions of the SSE. Maximum Likelihood Estimation and Expected A Posteriori were used as ability estimation method. Test termination rules were standard error threshold and fixed number of items. Second phase was actualized by implementing a CAT administration to a group of examinees to investigate performance of CAT administration in an environment other than simulated administration.
Findings of post-hoc simulations indicated CAT could be implemented by using Expected A Posteriori estimation method with standard error threshold value of 0.30 or higher for SSE. Correlation between ability estimates obtained by CAT and real SSE was found to be 0.95. Mean of number of items given to examinees by CAT is 18.4. Correlation between live CAT and real SSE ability estimations was 0.74. Number of items used for CAT administration is approximately 50% of the items in paper and pencil SSE science subtest. Results indicated that CAT for SSE science subtest provided ability estimations with higher reliability with fewer items compared to paper and pencil format.
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Čepl, Josef. "Měření vzdálenosti pomocí technologie ZigBee." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218269.
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The master's thesis deals with problems which is associated with rough detection of distance between wireless modules based on ZigBee technology. In the first logical part it theoretically describes this technology and their characteristics. This section gives basic informations needed to understand the operation of wireless communications and also acquaint him with some of the terms from this sphere. Next thing is description of the medium access together with a detailed description of functions that are crucial for deter-mining the signal strength. The second part is devoted to describe the 1321XDSK-BDM development kit. Another section is devoted to the design of the user's interface for displaying measured data. It consists of a theoretical design, which describes the initial vision of the device accompanied by solution of communication between wireless module and the proposed device. Follows the design of the involvement in Eagle software and explanation of the various components. In the last two chapters of the whole logical structure is described construction of the device and simple user's guide. The following chapter talks about the selection of suited application, necessary changes and own implementation of source code. There is even a description of important features and components of the application. The penultimate chapter contains a distance measurement in terrain using wireless modules and designed device. Here are tested different influences on the final distance measurement accuracy. In conclusion there is a debate over the results achieved. Particular, this section includes an assessment of precision measuring methods and evaluates aplicability of this method in practice.
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Poznyak, Dmytro. "The American Attitude: Priming Issue Agendas and Longitudinal Dynamic of Political Trust." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342715776.
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Youssef, Ziad. "Étude thermodynamique de la formation d'hydrates en absence d'eau liquide : mesures et modélisation." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00694018.
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Dans les applications industrielles et lors des opérations de transport du gaz naturel, la présence d'eau sous forme liquide ou en phase vapeur peut entraîner la formation d'hydrates provoquant le colmatage des unités industrielles et des lignes de conduites et il est indispensable de définir précisément les seuils de déshydratation à réaliser, afin d'éviter la formation d'hydrates. Cela est réalisé à l'aide d'un modèle thermodynamique qui prédit la stabilité des hydrates, en fonction de la température, de la pression et de la composition du gaz.Les modèles thermodynamiques classiques, développés uniquement sur la base de données expérimentales de formation d'hydrates en présence d'eau liquide, surestiment fortement la température de dissociation des hydrates en l'absence d'une phase aqueuse.Dans le but de définir un modèle thermodynamique capable de représenter convenablement les équilibres de phases vapeur-hydrate et prédire ainsi la température de dissociation des hydrates que l'on soit en présence ou en l'absence d'eau liquide, nous avons mis au point une méthodologie originale pour la détermination de la température de dissociation des hydrates de corps purs et de mélanges en l'absence d'eau liquide. Cette méthodologie, basée sur le suivi de la teneur en eau de phase vapeur, en fonction de la température par coulométrie Karl Fischer, a permis la détermination de la température de dissociation de plusieurs hydrates simples et mixtes à des teneurs en eau et pressions différentes ainsi que les quantités d'hydrates formées dans ces conditions.Sur la base de ces nouvelles données, nous avons défini un modèle thermodynamique basé sur l'utilisation de l'approche de Dharmawardhana pour le calcul de la fugacité de l'eau dans l'hydrate vide,le potentiel de Kihara pour le calcul de la constante de Langmuir et l'équation d'état CPA (Cubic Plus Association) pour la modélisation des phases fluides. Nous avons montré que l'utilisation de l'équation d'état CPA, capable de prendre en compte l'auto association de l'eau apporte une amélioration très significative.Le développement d'un flash biphasique hydrate-fluide nous a permis de calculer les quantités d'hydrates mixtes formées et de les comparer à nos données expérimentales.
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Bozorgi, Rozbe. "Åtgärdande av felkopplingar som kompensationsåtgärd för ökade dagvattenföroreningar : en fallstudie med en kostnads-nyttoanalys." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-363401.
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Weserdomen 2015 resulterade i en strängare tolkning av EU:s ramdirektiv för vatten vilket bland annat innefattade att inga exploateringar får tillåtas om dessa medför att minst en kvalitetsfaktor i vattnet får en sämre statusklass, oavsett hur övriga kvalitetsfaktorer påverkas. Den strängare tolkningen, i kombination med en ökad urbaniseringsgrad, ställer högre krav på samhällets hantering av spill- och dagvatten. Ett vanligt sätt att säkerställa ovanstående krav är att tillämpa olika lösningar för lokalt omhändertagande av dagvatten (LOD). Syftet med dessa lösningar är att hantera dagvattnet så nära uppkomstkällan som möjligt. I vissa fall kan det dock tänkas att det finns mer effektiva åtgärder för att säkerställa god vattenstatus. En åtgärd som syftar till att kompensera för frånvarandet av en annan åtgärd kallas för kompensationsåtgärd. I det här examensarbetet har fallet med att spåra och åtgärda felkopplingar i ledningsnätet (spillvatten kopplat på dagvattennätet) undersökts som kompensationsåtgärd för LOD. Den specifika LOD-lösning som använts i arbetet har varit dagvattendammar. Examensarbetet har utrett rådande lagstiftning vad gäller kompensationsåtgärder samt gjort en fallstudie för Bällstaån med en kostnads-nyttoanalys där åtgärdandet av felkopplingar jämförts med anläggandet av dagvattendammar. Resultatet av undersökningarna visade att kompensationsåtgärder idag är ett begrepp som kan tolkas olika, där det även i domstolen genom åren har tolkats olika. Nuvarande praxis är dock att en kompensationsåtgärd inte kan åberopas för att tillåta en exploatering som annars hade funnit avslag. Att kunna nyttja åtgärdandet av felkopplingar som kompensationsåtgärd för LOD är således, med dagens regelverk, väldigt osannolikt. Fallstudien visade att åtgärdandet av felkopplingar, med avseende på vattenkvalitet är en betydligt mer kostnads-nyttoeffektiv åtgärd i jämförelse med anläggandet av dagvattendammar. Bristen på studier och utredningar på felkopplingar av denna typ är, mot bakgrund av fallstudien, förmodligen en indikator på att mer resurser bör läggas inom detta område.In 2015 the Weser Case resulted in a more stringent interpretation of the EU Water Framework Directive. For instance, the ruling stated that no projects should be given permission if even as little as one quality factor ends up with a lower status, regardless of how the other quality factors are affected. The stricter interpretation, combined with an increasing grade of urbanization, places higher demands on society’s management of wastewater and stormwater. One common way of ensuring the above requirements is to apply different solutions of best management practices for stormwater (BMP). The purpose of these solutions is to process the water as close to the source of origin as possible. However, in some cases it may be that there are more effective measures to ensure good water quality. A measure taken with the purpose of compensating for the absence of a different action is called a compensatory measure. In this thesis, the case of fixing incorrect connection of sewage pipes (where wastewater pipes have been incorrectly connected to stormwater pipes) was investigated as a compensatory measure for stormwater ponds (a common BMP). The prevailing legislation regarding compensatory measures was analysed and a case study has been conducted for Bällstaån. The case study included a cost-benefit analysis where the fixing of incorrectly-connected sewage pipes was compared with the implementation of stormwater ponds. The investigation regarding the legislative aspect showed that compensatory measures are a concept that can be interpreted somewhat differently. This has also been the case in the court over the years. However, current practice shows that a compensatory measure cannot be invoked to allow a project that otherwise would have been refused. Being able to use the fixing of incorrect connections as a compensation for BMP is thus, with today’s regulation, very unlikely. The case study showed that fixing incorrect connections in sewage pipes is, with regard to water quality, a far more cost-beneficial measure compared to the construction of stormwater ponds. Furthermore, the lack of studies regarding this kind of incorrect connections is, in the light of the results from the case study, probably an indication that this is a problem that fairly few people work with and where more resources could be a good investment for future water quality.
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Fowler, Jennifer. "Indoor Environmental Quality within an Elementary School Classroom: Measurements of Felis domesticus I, Dermatophagoides pteronyssinus I, Dermatophagoides farinae I, and Blatella germanica in Carpeting." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002837.
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Peronnin, Théau. "Building and operating a quantum node of a microwave network." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEN025.
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Après des années de développement académique, l’électrodynamique quantique en circuit entre dans l’ère des applications. Cette thèse a été réalisée dans une volonté de créer des outils pour faire le lien entre une curiosité académique quantique, les circuits supraconducteurs, et un objectif majeur, l’ordinateur quantique universel. Une architecture vraisemblable de processeur quantique consiste à connecter en réseau un grand nombre de modules élémentaires. Lors de cette thèse expérimentale, le noeud d’un tel réseau, le quantum node, a été développé et fabriqué grâce aux techniques de l’état de l’art des circuits imprimés quantiques microonde. Ce circuit a été utilisé pour réaliser pour la première fois une méthode de lecture séquentielle d’un qubit supraconducteur. Cette méthode, proposée en 2013 par Sete et al., permettrait une lecture plus rapide et plus précise des qubits supraconducteurs. La lecture des qubits est l’un des obstacles majeurs limitant le développement d’ordinateurs quantiques universels sans erreur, ce qui rend ce projet autant intéressant pour sa mise en oeuvre inédite du quantum node que pour ses applications. Cette nouvelle méthode de lecture atteint des performances proches de l’état de l’art alors même que le circuit n’était pas optimisé pour cette fin. Lors de cette thèse, nous avons aussi contribué à deux autres expériences d’optique quantique microonde, détaillées ici. Un circuit dédié a été développé pour démontrer une nouvelle forme de mesure quantique : la mesure multiplexée du nombre de photons. Dans cette expérience, menée par A. Essig et Q. Ficheux, un qubit supraconducteur est lu simultanément à plusieurs fréquences pour extraire plus d’un bit d’information à la fois à propos du nombre de photons contenus dans un résonateur microonde couplé à un qubit. Enfin, nous avons contribué à la démonstration expérimentale de la suppression exponentielle des bit-flips dans un qubit encodé dans un état de chat de Schrödinger d’un mode microonde. Cette expérience, menée par R. Lescanne et Z. Leghtas, démontre une augmentation par un facteur 300 du temps de vie du qubit grâce à la correction d’erreur quantique autonome réalisée grâce à l’ingénierie de la dissipation d’un mode microondeAfter years of academic development, the circuit quantum electrodynamics is entering the age of applications. This thesis was realized in this context of creating tools to bridge the gap between an astounding academic quantum system, superconducting circuits, and a grand goal, the universal quantum computer. A likely blueprint for quantum processors consists in the assembly of a large number of elementary modules arranged in a network.In this experimental thesis, a possible node for such a network, the quantum node, was developed and fabricated using state-of-the-art techniques for 2D superconducting microwave circuits. This node was first used to implement a novel sequential readout method for a superconducting qubit. This experiment, first proposed in 2013 by Sete et al., potentially allows for faster, more accurate read out of superconducting qubits. The read out of qubits is one of the several bottlenecks limiting the development of fault-tolerant superconducting quantum computers, which made this project both useful as a demonstration of the quantum node and for applications. This novel readout method achieves readout performances close to state-of-the-art of superconducting qubit readout even though the chip was not optimized for that purpose.During this work, we also contributed to two other experiments engineering quantum measurement and dissipation with superconducting circuits. First, a dedicated circuit was developed to demonstrate a new form of quantum measurement: the multiplexed photon number measurement. In that experiment led by A. Essig and Q. Ficheux, a superconducting transmon quantum bit is read out at multiple frequencies simultaneously to extract more than one bit of information about the number of photons contained in a microwave resonator coupled to that quantum bit.Second, we contributed to the experimental demonstration of the exponential suppression of bit-flips in a qubit encoded in a Schrödinger Cat state of a microwave mode. This experiment led by R. Lescanne and Z. Leghtas, demonstrates the improvement by a factor 300 of the lifetime of a qubit thanks to the autonomous error correction realized through the engineering of the dissipation of a microwave mode
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Hunter, Brandon. "Channel Probing for an Indoor Wireless Communications Channel." BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/64.
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The statistics of the amplitude, time and angle of arrival of multipaths in an indoor environment are all necessary components of multipath models used to simulate the performance of spatial diversity in receive antenna configurations. The model presented by Saleh and Valenzuela, was added to by Spencer et. al., and included all three of these parameters for a 7 GHz channel. A system was built to measure these multipath parameters at 2.4 GHz for multiple locations in an indoor environment. Another system was built to measure the angle of transmission for a 6 GHz channel. The addition of this parameter allows spatial diversity at the transmitter along with the receiver to be simulated. The process of going from raw measurement data to discrete arrivals and then to clustered arrivals is analyzed. Many possible errors associated with discrete arrival processing are discussed along with possible solutions. Four clustering methods are compared and their relative strengths and weaknesses are pointed out. The effects that errors in the clustering process have on parameter estimation and model performance are also simulated.
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Sterner, Boström Måns. "Developing a measurement system of fluid velocities in rotating bed reactors." Thesis, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123227.
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SpinChem AB's rotating bed reactor (RBR) is a small cylindrical centrifuge that allowsfor eective convective reactions between chemical substances. The aim of my master'sdissertation was to develop a measurement system that could estimate the uid velocity insidethe RBR. This report covers a quick pre-study of dierent uid measurement methods,details how we designed and constructed the system using integrated circuits and other electroniccomponents, and illustrates calibration results and nal velocity measurements. Thesystem design was based on the architecture of hot-wire constant temperature anemometry(CTA), a technique that measures the uid velocity over a heated metal wire. The resultsof this project is the measurement system itself, and the calibration and velocity measurementsgathered from experimentation. Two issues we encountered was that the calibrationprocess resulted in an overestimation of the velocity in the order of 4000 cm/s, and thatthe response to changes in velocity rates was quite slow. However, a slight tuning of thetwo calibration constants A0 & B0 smoothed the velocity estimation out to 40 cm/s, whichis more what we would expect. This illustrated how sensitive the results were to errors inthe calibration. Further investigation of the slow response, and a more stringently executedcalibration setup, could make the CTA a potential candidate for estimating the uid velocityinside the RBR.
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Zhu, Rongchun. "Implementation of optimal design for item calibration in computerized adaptive testing (CAT) /." 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3250359.
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Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006.Source: Dissertation Abstracts International, Volume: 68-02, Section: A, page: 0540. Adviser: Jeffrey Douglas. Includes bibliographical references (leaves 60-63) Available on microfilm from Pro Quest Information and Learning.
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Kitching, Jolanda. "The measurement outcome equivalence of the career path appreciation (CPA) for employees from diverse cultural backgrounds." Diss., 2005. http://hdl.handle.net/2263/23206.
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The aim of this study is to determine whether or not the Career Path Appreciation (CPA) is cultural unbiased. The use of assessment instruments in South Africa has been criticised, because it is said that they are largely based on the values and knowledge of overseas instruments, which are considered to be less valid for South Africa’s various cultural groups. In this study, an Asian, black, coloured and white group were included to determine the cultural equivalence of the CPAs measurement outcomes. The results indicate that the CPA measurement outcomes are not biased and are, therefore, equivalent for groups of diverse cultural backgrounds.Dissertation (MCom (Human Resources Management))--University of Pretoria, 2006.
Human Resource Management
unrestricted
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"Approaches to Studying Measurement Invariance in Multilevel Data with a Level-1 Grouping Variable." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38458.
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abstract: Measurement invariance exists when a scale functions equivalently across people and is therefore essential for making meaningful group comparisons. Often, measurement invariance is examined with independent and identically distributed data; however, there are times when the participants are clustered within units, creating dependency in the data. Researchers have taken different approaches to address this dependency when studying measurement invariance (e.g., Kim, Kwok, & Yoon, 2012; Ryu, 2014; Kim, Yoon, Wen, Luo, & Kwok, 2015), but there are no comparisons of the various approaches. The purpose of this master's thesis was to investigate measurement invariance in multilevel data when the grouping variable was a level-1 variable using five different approaches. Publicly available data from the Early Childhood Longitudinal Study-Kindergarten Cohort (ECLS-K) was used as an illustrative example. The construct of early behavior, which was made up of four teacher-rated behavior scales, was evaluated for measurement invariance in relation to gender. In the specific case of this illustrative example, the statistical conclusions of the five approaches were in agreement (i.e., the loading of the externalizing item and the intercept of the approaches to learning item were not invariant). Simulation work should be done to investigate in which situations the conclusions of these approaches diverge.Dissertation/Thesis
Masters Thesis Psychology 2016
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Lin, Tian-Li, and 林天立. "Measurement of AFP, CEA and CA 125 with quartz crystal microbalance immunosensors by using 125I labeled monoclonal antibody." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/00157935436144851044.
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碩士高雄醫學大學
醫學研究所碩士班
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The objective of this study is to develop a quartz crystal microbalance (QCM) based immuno-sensor for the detection of AFP, CEA and CA-125. The major step of this study is the immobilizing of antibody on-to the gold evaporated surface of QCM chip. three kinds of interfacial material 11-MUA, cystamine+glutaraldehyde and cystamine, were studied to find the optimized parameters for the immobilizing of selected antibody. 125I labeled antibody were applied for the antibody immobilizing study. Comparing the quantity of deposited antibody and the availability of procedure, cystamine method was the most favorite. Through the optimized procedures, the antibodies of AFP, CEA and CA-125 were immobilized on-to the QCM chip. The well-prepared immuno-sensors were applied to set up the standard calibration curve. The quantitative range and correlation coefficient are: AFP：10∼245 ng/mL，R2＝0.9473 ；CEA：3.5∼210 ng/mL，R2＝0.97；CA-125.：15∼200 U/mL，R2＝0.9089。 Finally, some human serum samples were assayed by QCM and RIA. There were good correlation between QCM and RIA. ( AFP：R2＝0.9161，n=20；CEA：R2＝0.8954，n=25；CA 125：R2＝0.9196，n=20 )
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(6589640), Ji Yoon Jung. "A Comparison of CFA and ESEM Approaches Using TIMSS Science Attitudes Items: Evidence from Factor Structure and Measurement Invariance." Thesis, 2019.
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The power of positive attitudes toward science is that they influence science achievement by reinforcing higher performance. Interestingly, there continue to be gender disparities in attitudes toward science across many countries. Males generally have more positive attitudes toward science than females. Although most research related to attitudes toward science have been based on the Trends in International Mathematics and Science Study (TIMSS) Student Questionnaire, there remains a dearth of evidence validating the TIMSS science attitudes items and measurement equivalence across genders.
The goals of this research were as follows: (1) to build support for the structural validity of the TIMSS items, and (2) to investigate whether the instrument measures the same latent construct (attitudes toward science) across genders. The present study followed two steps of statistical analyses. As a first step, two modeling methods (confirmatory factor analysis and exploratory structural equation modeling) were conducted to identify the best-fitting model for the instrument. Second, after determining the model of choice, we tested several nested invariance models progressively.
This study found (1) the latent factor structure of the TIMSS items and (2) strong measurement invariance across genders. This result indicated that the instrument is well designed by the a priorispecification and measures the same latent variable for both female and male students. This study provides support for the multidimensional approach to measuring science attitudes and shows the flexibility of ESEM over CFA by demonstrating that the ESEM approach provided better representation of the underlying factor structure.
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"The Impact of Partial Measurement Invariance on Between-group Comparisons of Latent Means for a Second-Order Factor." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38560.
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abstract: A simulation study was conducted to explore the influence of partial loading invariance and partial intercept invariance on the latent mean comparison of the second-order factor within a higher-order confirmatory factor analysis (CFA) model. Noninvariant loadings or intercepts were generated to be at one of the two levels or both levels for a second-order CFA model. The numbers and directions of differences in noninvariant loadings or intercepts were also manipulated, along with total sample size and effect size of the second-order factor mean difference. Data were analyzed using correct and incorrect specifications of noninvariant loadings and intercepts. Results summarized across the 5,000 replications in each condition included Type I error rates and powers for the chi-square difference test and the Wald test of the second-order factor mean difference, estimation bias and efficiency for this latent mean difference, and means of the standardized root mean square residual (SRMR) and the root mean square error of approximation (RMSEA).
When the model was correctly specified, no obvious estimation bias was observed; when the model was misspecified by constraining noninvariant loadings or intercepts to be equal, the latent mean difference was overestimated if the direction of the difference in loadings or intercepts of was consistent with the direction of the latent mean difference, and vice versa. Increasing the number of noninvariant loadings or intercepts resulted in larger estimation bias if these noninvariant loadings or intercepts were constrained to be equal. Power to detect the latent mean difference was influenced by estimation bias and the estimated variance of the difference in the second-order factor mean, in addition to sample size and effect size. Constraining more parameters to be equal between groups—even when unequal in the population—led to a decrease in the variance of the estimated latent mean difference, which increased power somewhat. Finally, RMSEA was very sensitive for detecting misspecification due to improper equality constraints in all conditions in the current scenario, including the nonzero latent mean difference, but SRMR did not increase as expected when noninvariant parameters were constrained.Dissertation/Thesis
Masters Thesis Educational Psychology 2016
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Yang, Tae-kyoung Chang Hua-Hua. "Measurement of Korean EFL college students' foreign language classroom speaking anxiety evidence of psychometric properties and accuracy of a computerized adaptive test (CAT) with dichotomously scored items using a CAT simulation /." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/2199/yangt52868.pdf.
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Yang, Tae-kyoung. "Measurement of Korean EFL college students' foreign language classroom speaking anxiety: evidence of psychometric properties and accuracy of a computerized adaptive test (CAT) with dichotomously scored items using a CAT simulation." Thesis, 2005. http://hdl.handle.net/2152/2199.
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"Is Quantum Decoherence Reality or Appearance?" ESI preprints, 2001. ftp://ftp.esi.ac.at/pub/Preprints/esi1041.ps.
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Wijayanto, Yagus. "Cumulative Effects Assessment (CEA) in spatially unconstrained area using geographical information systems (GIS) and water quality modelling : thesis submitted for the degree of Doctor of Philosophy / Yagus Wijayanto." 2002. http://hdl.handle.net/2440/21817.
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Includes bibliographical references (leaves [268]-285)xiv, 285, [85] leaves : ill. (some folded), maps (col., folded) ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Thesis (Ph.D.)--University of Adelaide, Dept. of Geographical and Environmental Studies, 2002
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Kassie, Mulugeta Gebre-Medhin. "Market orientation and business performance : an empirical study of the banking sector in Ethiopia." Thesis, 2015. http://hdl.handle.net/10500/19157.
Full textAbstract:
The purpose of this study was to examine the relationship between market orientation and business performance mediated by marketing resources and moderated by contextual factors. The study also examined the extent to which the conceptual model was a good fit to the sample data. A quantitative approach was used to test if there was a significant relationship between market orientation, marketing resources, and business performance. For the purpose, a cross-sectional survey was carried out to obtain data pertaining to market orientation, marketing resources, contextual factors and business performance. The unit of analysis of the study was banks consisting of 3 public and 15 private banks. A sample size of 507 consisting of 492 branch managers and 15 top level marketing managers was used in the survey. With a response rate of 87.97%, 446 questionnaires were collected of which 377 were used for data analysis.
A SEM was used to test the extent to which the theoretical model fits the sample data. Mediation analysis was used to test the indirect effect of market orientation on business performance and hierarchical regression analysis was used to test whether the relationship was moderated by market dynamism, competitive intensity, and government regulation. Finally, an independent t – test was used to examine the statistical variations between public and private banks in terms of market orientation, marketing resources, and business performance.
The confirmatory factor analysis revealed that the modified model was fit with the observed data in terms of chi-square and the individual indices. The total effect of market orientation on business performance was moderate with a 0.36 regression coefficient. The indirect effect was high with a 0.91 regression coefficient where complete and inconsistent mediation was found due to suppression effect. The moderation analysis revealed that the interaction effect of market dynamism, competitive intensity, and government regulation was not statistically significant. Finally the result showed that there was a statistically meaningful difference between public and private banks in terms of market orientation, marketing resources, and business performance.
Banks in Ethiopia shall strive to segment the market, differentiate their services, and build a strong brand with clear identity. Banks in Ethiopia shall also build on their marketing resources to enhance their business performance.Business Management
D.B.L.
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Kassie, Mulugeta Gebre-Medhin, and Mulugeta Gebre-Medhin Kassie. "Market orientation and business performance : an empirical study of the banking sector in Ethiopia." Thesis, 2015. http://hdl.handle.net/10500/19157.
Full textAbstract:
The purpose of this study was to examine the relationship between market orientation and business performance mediated by marketing resources and moderated by contextual factors. The study also examined the extent to which the conceptual model was a good fit to the sample data. A quantitative approach was used to test if there was a significant relationship between market orientation, marketing resources, and business performance. For the purpose, a cross-sectional survey was carried out to obtain data pertaining to market orientation, marketing resources, contextual factors and business performance. The unit of analysis of the study was banks consisting of 3 public and 15 private banks. A sample size of 507 consisting of 492 branch managers and 15 top level marketing managers was used in the survey. With a response rate of 87.97%, 446 questionnaires were collected of which 377 were used for data analysis.
A SEM was used to test the extent to which the theoretical model fits the sample data. Mediation analysis was used to test the indirect effect of market orientation on business performance and hierarchical regression analysis was used to test whether the relationship was moderated by market dynamism, competitive intensity, and government regulation. Finally, an independent t – test was used to examine the statistical variations between public and private banks in terms of market orientation, marketing resources, and business performance.
The confirmatory factor analysis revealed that the modified model was fit with the observed data in terms of chi-square and the individual indices. The total effect of market orientation on business performance was moderate with a 0.36 regression coefficient. The indirect effect was high with a 0.91 regression coefficient where complete and inconsistent mediation was found due to suppression effect. The moderation analysis revealed that the interaction effect of market dynamism, competitive intensity, and government regulation was not statistically significant. Finally the result showed that there was a statistically meaningful difference between public and private banks in terms of market orientation, marketing resources, and business performance.
Banks in Ethiopia shall strive to segment the market, differentiate their services, and build a strong brand with clear identity. Banks in Ethiopia shall also build on their marketing resources to enhance their business performance.Business Management
D.B.L.