Temat: experimental design

Skocz do pozycji: 1.

Tytuł:: On the optimal continuous experimental design problem
Autorzy:: Kitsos, Christos
Tematy:: nonlinear experimental design
static
sequential design; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/729876.pdf Link otwiera się w nowym oknie
Opis:: The target of this paper is to provide a compact review of the Optimal Experimental Design, the continuous case. Therefore we are referring to the general nonlinear problem in comparison to the linear one.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Brackish Water Desalination by Nanofiltration–Effect of Process Parameters
Autorzy:: Collana, Juan Medina
Dextre, Carlos Ancieta
Taranco, Oscar Rodríguez
Venegas, Luis Carrasco
Pisfil, Jorge Montaño
Bravo, Pablo Diaz
Llanos, Segundo Vásquez
Tematy:: brackish groundwater
desalination
nanofiltration
experimental design; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/59114055.pdf Link otwiera się w nowym oknie
Opis:: Brackish water is an important source of water resources with lower salt content than seawater. Desalination is a very important treatment to remedy the scarcity of fresh water throughout the world. In this work, it has been proposed to desalinate brackish groundwater using a commercial nanofiltration membrane. The experiments were carried out on the basis of a factorial design using three factors and two levels of study for each variable. For this purpose, it selected the feed pressure (X1) of the membrane module at (60 and 100 psi), feed water salinity (X2) at levels of (3.4 and 6.01 mS/cm) and operating temperature (X3) at levels (20 and 28°C) to evaluate its effect on the percentage flux recovery and salt retention. The results showed that the most significant variable is the feed pressure, achieving higher flow recovery and the percentage of salinity rejection at the 100 Psi level. This showed that by increasing the pressure from (60 to 100 psi), there was a considerable increase in flow recovery (42 to 72%) and salt rejection (24.6 to 28.4%). Likewise, by increasing the temperature from 20 to 28°C, the recovered f low rate increased from (49.78 to 63.2%) and the percentage of salt separation showed an increase from 25.95 to 27.05%. Similarly, by increasing the starting conductivity of the brackish water from (3.4 to 6.01 mS/cm) the percentage of flow recovery has decreased from (61.46 to 51.525%). Likewise, the permeate flow rate increased linearly with feed pressure from 132 L/h (P=40 Psi) to 420 L/h (108 Psi). In conclusion, this research confirms the suitability of the commercial NF membrane studied for brackish water desalination.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Statistical properties of a control design of controls provided by supreme chamber of control
Autorzy:: Zieliński, Wojciech
Tematy:: statistical quality control
alternative rating
experimental design; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Powiązania:: https://bibliotekanauki.pl/articles/453333.pdf Link otwiera się w nowym oknie
Opis:: In statistical quality control objects are alternatively rated. It is of interest to estimate a fraction of negatively rated objects. One of such applications is a quality control provided by Supreme Chamber of Control (NIK) to find out a percentage of abnormalities in the work among others of tax offices. Mathematical details of experimental designs for alternatively rated phenomena are given in Karliński (2003). There are given requirements for sample sizes, numbers of negative rates, accuracy of estimation and error risks. In the paper, some statistical properties of given plans are investigated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Fake News Going Viral: The Mediating Effect Of Negative Emotions
Autorzy:: Corbu, Nicoleta
Bârgăoanu, Alina
Durach, Flavia
Udrea, Georgiana
Tematy:: Discrete emotions
Experimental design
Fake news
Viralisation effects; Pokaż więcej
Wydawca:: Univerzita sv. Cyrila a Metoda. Fakulta masmediálnej komunikácie
Powiązania:: https://bibliotekanauki.pl/articles/52482717.pdf Link otwiera się w nowym oknie
Opis:: In recent years, “fake news” has become a buzzword used to describe a variety of disinformation practices identifiable both in the traditional media, and in the digital environment. The goal of our paper is to investigate fake news, aiming at both clarifying the concept and discussing the possible integration of ideologically driven information under this large umbrella, as well as investigating conditions under which various types of fake news have the potential to go viral. In this study we consider ideologically driven news as a form of disinformation, by the mere reason that there is a clear intention to deceive behind this type of news. At the same time, we argue that, compared to no more than one-two decades ago, ideologically driven information is potentially much more harmful, by virtue of the potential of being shared, easily further disseminated within echo-chambers and with the help of filter bubbles. In line with recent studies, we contend that, at its core, the fake news problem concerns the economics of emotion, specifically how emotions are used and often abused to foster audience’s attention, engagement, and willingness to share content. In this context, and under the recent political circumstances in Romania (marked by anti-government protests and public opposition to the ruling political party), our aim is to better understand how people’s susceptibility to disseminate deceitful information is enhanced by various forms and valences of politically biased fake news, and what is the role of specific emotions in explaining this process. Bulding on Tandoc et al.’s classification of fake news, we propose a 2x2x2 experimental design, in which we manipulated intention to deceive, level of facticity and valence. The survey experiment (N=813) tests two positive (enthusiasm and contentment) and two negative (anger and fear) discrete emotions as mediators of the main effect of potential of viralisation effects (i.e. how likely users are to share fake news on a social network). Results show that negatively biased fake news enhances people’s willingness to share the news story, while positively biased fake news has no significant effect on the viralisation potential. Moreover, the potential for viralisation is mediated by negative emotions, but not by positive ones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Addendum no. 3 Theory of errors and statistics. Some thoughts about Gauss
Autorzy:: Sheynin, Oscar
Tematy:: the theory of errors
experimental design
exploratory data analysis; Pokaż więcej
Wydawca:: Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Powiązania:: https://bibliotekanauki.pl/articles/434102.pdf Link otwiera się w nowym oknie
Opis:: It is explained that the theory of errors is the application of the statistical method to the entire process of measuring physical magnitudes. In particular, the present- -day experimental design and exploratory data analysis can be considered as a branch of the error theory.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Coupled fuzzy logic and experimental design application for simulation of a coal classifier in an industrial environment
Autorzy:: Khoshdast, Hamid
Soflaeian, Ali
Shojaei, Vahideh
Tematy:: combined modeling
fuzzy logic
experimental design
coal classifier
industry; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109838.pdf Link otwiera się w nowym oknie
Opis:: Design of experiments (DOE) is an effective method providing useful information about the interaction of operating variables and the way the total system works by using statistical analyses. However, its industrial application is limited because it is almost difficult to maintain variables in DOE matrix at desired constant levels in industrial environment. Thus, this paper aims to present a new mixed modeling method which is a combination of fuzzy logic and design of experiments methods to overcome such practical limitations. The method first uses a fuzzy model which is trained by practical data gathered from industry to predict DOE response corresponding to each run in DOE matrix. Then, a statistical parametric model is constructed for the prediction of process response to any change of operating parameters under real industrial conditions. The proposed mixed method was successfully validated by using data obtained from a coal hydraulic classifier at Zarand Coal Washing Plant (Kerman, Iran). The method also seems to be a promising tool for modeling all devices and processes in real industrial environment and allows researchers to benefit from all the advantages of experimental design and fuzzy logic methods simultaneously.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Modelling of electrical power distribution systems by application of experimental design
Autorzy:: Nazarko, Joanicjusz
Wydawca:: IEEE
Cytata wydawnicza:: J. Nazarko, Modelling of electrical power distribution systems by application of experimental design, 2000 IEEE Power Engineering Society Winter Meeting, 23-27 January 2000, Singapore, pp. 1145-1149 vol. 2
Opis:: Joanicjusz Nazarko
The purpose of this paper is to demonstrate the application of the method of experimental design to the analysis of electrical power distribution systems. The theory of experimental design allows us to construct and experimentally verify the qualitative model of a power distribution system in order to analyse a significance of each component in distribution system modelling. The paper presents results obtained from simulation studies on the effect of uncertain input data on the calculation of output characteristics of power distribution systems. An investigation of input data errors and their influence on systems analysis results has a particular importance in real-time modelling of power systems. The simulation experiment was carried out for the numerical model of an existing radially operated power distribution system of 15 kV
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 8.

Tytuł:: Irreproducibility –The deadly sin of preclinical research in drug development
Autorzy:: Pillai, S.K.
Kobayashi, K.
Michael, M.
Arumugam, M.
Tematy:: preclinical research
drug development
irreproducibility
statistical analysis
experimental design; Pokaż więcej
Wydawca:: Instytut Medycyny Wsi
Powiązania:: https://bibliotekanauki.pl/articles/2098205.pdf Link otwiera się w nowym oknie
Opis:: Introduction. In recent years the irreproducibility of preclinical studies has become a serious concern in drug developmental research. The findings of preclinical studies that cannot be reproduced are a drain on public resources and slow down the drug discovery process. Among the various factors that contribute to irreproducibility in preclinical drug developmental research, poor statistical analysis and weak experimental design play a major role in the failure of drugs in clinical research. Objective. The aim of this review is to describe key factors, such as poor statistical analysis and weak experimental design, that contribute to the irreproducibility of preclinical studies in drug development, and how such studies slow down the drug development process. Brief description of the state of knowledge. The irreproducibility of preclinical research is a serious issue that researchers, especially those who are involved in drug discovery, are facing today. The irreproducibility of research drains public resources, time, and diminish the trust of the common man in the research community. The factors that contribute to the irreproducibility of preclinical research are related to experiment design and improper statistical analysis of the experimental data. Most of these factors can be eliminated by researchers developing a commitment to science and society. Conclusion. Poor experimental design and lack of knowledge or limited knowledge of statistical analysis of data contribute significantly to the irreproducibility of preclinical research. A well-designed experiment with proper statistical analysis of data conducted by committed researchers rarely fails to reproduce.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A study of the effect of operating parameters in column flotation using experimental design
Autorzy:: Bedekovic, G.
Tematy:: froth flotation
column flotation
coal
experimental design
operating parameters; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110943.pdf Link otwiera się w nowym oknie
Opis:: The effect of air flow rate, pulp density and particle size was studied using central composite design for coal samples from the Lazy mine. Evaluation of column flotation tests was based on two dependant variables such as ash content and combustible matter recovery in the concentrate. The ash content in the concentrate was from 4.61 to 9.62% with the recovery of combustible matter from 17.43 to 81.98%. The ANOVA statistical analysis showed that the main effect of air flow rate has a significant impact on the combustible matter recovery and ash content in the concentrate. The main effect of pulp density on the combustible matter recovery is significant, whereas for the ash content it is not seen. There is a strong effect of the particle size on the ash content and combustible matter recovery in the concentrate. The interaction of the effect of the pulp density and particle size has a significant impact on the ash content in the concentrate.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: More ecological ERA : incorporating natural environmental factors and animal behavior
Autorzy:: Laskowski, Ryszard
Bednarska, Agnieszka
Jevtić, Dragan M.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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