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Titulador automático baseado em filmes digitais para determinação de dureza e alcalinidade total em águas minerais/Titulador automático baseado em filmes digitais para determinação de dureza e alcalinidade total em águas mineraisSiqueira, Lucas Alfredo 29 February 2016 (has links)
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Previous issue date: 2016-02-29 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Total hardness and Total alkalinity are important physico-chemical parameters
for the evaluation of water quality and are determined by volumetric analytical
methods. These methods have difficult to detect the endpoint of the titration due
to the difficult of viewing the color transition inherent to each of them. To
circumvent this problem, here is proposed a new automatic method for the
detection of the titration end point for the determination of total hardness and
total alkalinity in mineral water samples. The proposed flow-batch titrator
consists of a peristaltic pump, five three-way solenoid valves, a magnetic stirrer,
an electronic actuator, an Arduino MEGA 2560TM board, a mixing chamber and
a webcam. The webcam records the digital movie (DM) during the addition of
the titrant towards mixing chamber, also recording the color variations resulting
from chemical reactions between titrant and sample within chamber. While the
DM is recorded, it is decompiled into frames ordered sequentially at a constant
rate of 30 frames per second (FPS). The first frame is used as a reference to
define the region of interest (RI) of 48 × 50 pixels and the R channel values,
which are used to calculate the Pearson's correlation coefficient (r) values. r is
calculated between the R values of the initial frame and each subsequent
frame. The titration curves are plotted in real time using the values of r (ordinate
axis) and the total opening time of the valve titrant (abscissa axis). The end
point is estimated by the second derivative method. A software written in
ActionScript 3.0 language manages all analytical steps and data treatment in
real time. The feasibility of the method was attested by its application for the
analysis of natural water samples. Results were compared with classical
titration and did not present statistically significant differences when the paired ttest
at the 95% confidence level was applied. The proposed method is able to
process about 71 samples per hour, and its precision was confirmed by overall
relative standard deviation (RSD) values, always lower than the 2,4% for total
hardness and 1,4% for total alkalinity. / A dureza total e a alcalinidade total são importantes parâmetros físico-químicos
para avaliação da qualidade de águas e são determinados por métodos
volumétricos de análise. Estes métodos apresentam difícil detecção do ponto
final da titulação devido à dificuldade de visualização das transições de cores
inerentes a cada um deles. Para contornar este problema, foi proposta neste
trabalho uma nova metodologia automática para a detecção do ponto final nas
determinações de dureza total e alcalinidade total em águas. O titulador em
fluxo-batelada proposto é composto de uma bomba peristáltica, cinco válvulas
solenoides de três vias, um agitador magnético, um acionador de válvulas, uma
placa Arduíno MEGA 2560TM, uma câmara de mistura e uma webcam. O
programa de gerenciamento e controle do titulador foi escrito em linguagem
ActionScript 3.0. A webcam grava o filme digital durante a adição do titulante na
câmara de mistura, registrando as variações de cor decorrentes das reações
químicas entre titulante e amostra no interior de câmara. Enquanto o filme é
gravado, este é decomposto em quadros ordenados sequencialmente a uma
taxa constante de 30 quadros por segundo (FPS). O primeiro quadro é utilizado
como referência para definir uma região de interesse (RI) com 48 x 50 pixels,
na qual seus valores R, G e B são utilizados para calcular os valores de
coeficiente de correlação de Pearson (r). O valor de r é calculado entre os
valores de R do quadro inicial e de cada quadro subsequente. As curvas de
titulação são obtidas em tempo real usando os valores de r (ordenadas) e o
tempo total de abertura da válvula de titulante (abscissas). O ponto final é
estimado pelo método de segunda derivada. O método foi aplicado na análise
de águas minerais e os resultados foram comparados com a titulação clássica,
não apresentando diferenças estatisticamente significativas com aplicação do
teste t pareado a 95% de confiança. O método proposto foi capaz de processar
até 71 amostras por hora e a sua precisão foi confirmada pelos valores de
desvio padrão relativos (DPR) globais, sempre inferiores as 2,4% para dureza
total e 1,4% para alcalinidade total.
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Parciální a podmíněné korelační koeficienty / Partial correlation coefficients and theirs extensionŘíha, Samuel January 2015 (has links)
No description available.
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Grandes déviations précises pour des statistiques de test / Sharp Large Deviations for some Test StatisticsTruong, Thi Kim Tien 10 December 2018 (has links)
Cette thèse concerne l’étude de grandes déviations précises pour deux statistiques de test:le coefficient de corrélation empirique de Pearson et la statistique de Moran.Les deux premiers chapitres sont consacrés à des rappels sur les grandes déviations précises et sur la méthode de Laplace qui seront utilisés par la suite. Par la suite, nous étudions les grandes déviations précises pour des coefficients de Pearson empiriques qui sont définis par:$r_n=\sum_{i=1}^n(X_i-\bar X_n)(Y_i-\bar Y_n)/\sqrt{\sum_{i=1}(X_i-\bar X_n)^2 \sum_{i=1}(Y_i-\bar Y_n)^2}$ ou, quand les espérances sont connues, $\tilde r_n=\sum_{i=1}^n(X_i-\mathbb E(X))(Y_i-\mathbb E(Y))/\sqrt{\sum_{i=1}(X_i-\mathbb E(X))^2 \sum_{i=1}(Y_i-\mathbb E(Y))^2} \, .$. Notre cadre est celui d’échantillons (Xi, Yi) ayant une distribution sphérique ou une distribution gaussienne. Dans chaque cas, le schéma de preuve suit celui de Bercu et al.Par la suite, nous considérons la statistique de Moran $T_n=\frac{1}{n}\sum_{k=1}^n\log\frac{X_i}{\bar X_n}+\gamma \, ,$o\`u $\gamma$, où γ est la constante d’ Euler. Enfin l’appendice est consacré aux preuves de résultats techniques. / This thesis focuses on the study of Sharp large deviations (SLD) for two test statistics:the Pearson’s empirical correlation coefficient and the Moran statistic.The two first chapters aim to recall general results on SLD principles and Laplace’s methodsused in the sequel. Then we study the SLD of empirical Pearson coefficients, name $r_n=\sum_{i=1}^n(X_i-\bar X_n)(Y_i-\bar Y_n)/\sqrt{\sum_{i=1}(X_i-\bar X_n)^2 \sum_{i=1}(Y_i-\bar Y_n)^2}$ and when the meansare known,$\tilde r_n=\sum_{i=1}^n(X_i-\mathbb E(X))(Y_i-\mathbb E(Y))/\sqrt{\sum_{i=1}(X_i-\mathbb E(X))^2 \sum_{i=1}(Y_i-\mathbb E(Y))^2} \, .$ .Our framework takes place in two cases of random sample (Xi, Yi): spherical distributionand Gaussian distribution. In each case, we follow the scheme of Bercu et al. Next, westate SLD for the Moran statistic $T_n=\frac{1}{n}\sum_{k=1}^n\log\frac{X_i}{\bar X_n}+\gamma \, ,$o\`u $\gamma$ , where γ is the Euler constant.Finally the appendix is devoted to some technical results.
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Vliv vybraných kondičních faktorů na výkonnost ve vodním slalomu / Influence of selected conditional factors on performance in white water slalomVondra, Jan January 2016 (has links)
Title: Influence of selected conditional factors on performance in white water slalom. Aims: The aim of the study was to investigate the relationship of selected specific movement abilities being examined modified test battery with the performance of athletes in the water slalom. Methods: It was used field measurements where the applied modified test battery. Using GPS module to determine the distance partial tests from batery. For measuring was used manual measurement. To determine the statistical correlation between the modified battery and performance ability of competitors was used two different coefficients of correlation and regression analysis. According to the order of the test and the race was used nonparametric correlation study - Spearman correlation coefficient. Determining the statistical significance of the relationship of measured times in tests and final time in the nomination races have used the Pearson correlation coefficient. Results: For a statistically significant relationship was determined value when r ≥ 0.8. Spearman's correlation coefficient: In the test at 40 m were obtained these correlation coefficients: Nomination races rs = 0,380952, Czech cup rs = 0,595238. In the test at 80 meters they were obtained these correlation coefficients: nomination races rs = 0,857143,...
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Řízení poslechových testů pro subjektivní hodnocení kvality audio signálu / Evaluation of listening tests for subjective assessment of audio qualityKovařík, Tomáš January 2012 (has links)
The point of this thesis was to perform listening tests. Appropriate methods of performance were selected for these tests, tests were carried out and the data were analyzed using statistical analysis. Then was compiled the resulting interval scale from results of the first test and in the second listening test were determined average values SNR for background noises.
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Evoluční optimalizace analogových obvodů / Evolutionary Optimisation of Analogue CircuitsMihulka, Tomáš January 2017 (has links)
The aim of this work was to create a system for optimisaton of specific analog circuits by evolution using multiple fitness functions . A set of experiments was run, and the results analyzed to evaluate the feasibility of evolutionary optimisation of analog circuits . A requirement for this goal is the study and choice of certain types of analog circuits and evolutionary algorithms . For the scope of this work , amplifiers and oscillators were chosen as target circuits , and genetic algorithms and evolutionary strategies as evolutionary algorithms . The motivation for this work is the ongoing effort to automate the design and optimisation of analog circuits , where evolutionary optimisation is one of the options .
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Komparace konsolidace demokracie na území bývalého východního bloku / Comparison of Democratic Consolidation in Former Eastern BlocBárta, Vít January 2016 (has links)
The aim of this thesis is to numerically evaluate democratic consolidation in Eastern European countries of the former Eastern Bloc. To compare these countries with each other and decide which of these countries can be considered as consolidated democracies. Secondary aim is to find which factors supported this consolidation or at least correlate with it. Theoretical basis of this work is Wolfgang Merkel's theory of democratic consolidation. He divides democratic consolidation into four levels: constitutional consolidation, representative consolidation, behavioral consolidation and democratic consolidation of the political culture. Each level of democratic consolidation is numerically expressed, with usage of Bertelsmann's transformation index data, separately for all states in two-year intervals since 2005 to 2015. Based on that, overall democratic consolidation is calculated. Therefore, we can compare countries between each other and in time. Correlation between factors supporting consolidation and overall democratic consolidation is expressed by Pearson correlation coefficient. This work is beneficial in creating and describing method, which can be used for numerical expression of democratic consolidation in any state since 2005 to 2015 without author's subjective influence. Another benefit is...
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