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1
Content available Pozyskiwanie danych i projektowanie eksperymentów w technice nurkowej
100%
Kłos R.
Polish Hyperbaric Research
|
2005
|
tom Nr 4(13)
25-53
PL
Inwestowanie w prace prowadzone metodą błądzenia przypadkowego najczęściej jest nieopłacalne, dlatego poszukiwanie optymalnych i użytecznych rozwiązań wymaga szybkiego prowadzenia efektywnych badań. W ich planowaniu pomocne mogą być metody statystyki matematycznej. Materiał zawarty w artykule opracowano w ramach pracy pt.: "System głębokowodnych nurkowań trimiksowych ".
EN
Investing in research using the method of accidental erring is most often highly unprofitable due to the need for quick and efficient tests and decisions. That is why today scientists look for optimal and more efficacious statistical methods for research design. This paper presents the result of a project entitled: "Deep Diving Trimix System", sponsored by the Naval Academy, Gdynia.
2
Content available remote A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol
80%
Knight A. W. , Eitrheim E. S. , Nelson A. W. , Schultz M. K.
Nukleonika
|
2015
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tom 60
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nr 4
837-845
EN
Reprocessing of spent nuclear fuel usually employs the solvent extraction technique to recover fissile material, isolate other valuable radionuclides, recover precious metals, and remove contaminants. Efficient recovery of these species from highly radioactive solutions requires a detailed understanding of reaction conditions and metal speciation that leads to their isolation in pure forms. Due to the complex nature of these systems, identification of ideal reaction conditions for the efficient extraction of specific metals can be challenging. Thus, the development of experimental approaches that have the potential to reduce the number of experiments required to identify ideal conditions are desirable. In this study, a full-factorial experimental design was used to identify the main effects and variable interactions of three chemical parameters on the extraction of protactinium (Pa). Specifically we investigated the main effects of the anion concentration (NO3-, Cl-) extractant concentration, and solution acidity on the overall extraction of protactinium by 2,6-dimethyl-4-heptanol (diisobutylcarbinol; DIBC) from both HCl and HNO3 solutions. Our results indicate that in HCl, the extraction of protactinium was dominated by the solution acidity, while in nitric acid the extraction was strongly effected by the [DIBC]. Based on our results, a mathematical model was derived, that describes the relationship between concentrations of anions, extractant, and solution acidity and the expected values of Pa distribution coefficients in both HCl and HNO3. This study demonstrates the potential to predict the distribution coefficient values, based upon a mathematical model generated by a full-factorial experimental design.
3
Content available remote Application of the design of experiments in the epoxidation process of 1,5,9-cyclododecatriene
80%
Lewandowski G. , Ćwirko J.
Polish Journal of Chemical Technology
|
2007
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tom 9
|
nr 4
68-71
EN
An influence of the molar ratio of cis, trans, trans-1,5,9-cyclododecatriene to tert-butyl hydroperoxide, the concentration of the catalyst and the reaction time on the performance of the epoxidation process of cis, trans, trans-1,5,9-cyclodecatriene with tert-butyl hydroperoxide at the presence of molybdenum hexacarbonyl Mo(CO)6 was examined. Examinations were performed using statistical methods of the design of experiments. A mathematical model describing the influence of the parameters on conversion cis, trans, trans-1,5,9-cyclododecatriene was obtained. An analysis of the data and rests was performed and an optimal value of conversion of cis, trans, trans-1,5,9-cyclododecatriene was established.
4
Content available On the search for conditions for production process optimization
80%
Szerszunowicz M.
Mathematical Economics
|
2014
|
nr 10(17)
91-102
EN
The experimental design methodology mainly deals with the estimation of a usually unknown response surface function. An important problem in the field of design of experiments is to determine the number of experimental trials, taking into account certain limitations resulting from the nature of the manufacturing process. The experimental design methodology also includes – as if a separate section – methods of searching for conditions for the optimization of processes and the optimal design of experiments. The aim of this paper is to present a method of searching for conditions for the optimization of manufacturing process results. The proposed method uses non-classical statistical methods and is presented for selected empirical data.
5
Content available remote Uncommon applications of statistical methods of the design of experiments in chemical technology and environment protection
60%
Lewandowski G. , Ćwirko J.
Polish Journal of Chemical Technology
|
2007
|
tom 9
|
nr 4
63-67
EN
The review of literature related to the applications of statistic methods of design of experiments in chemical technology and environment protection was presented in the work. The research that consists of two stages: a stage of choosing the best variables describing an experimental object and a stage of proper experimental investigation, seems particularly interesting.An interesting example of an application of statistical strategies in environmental protection is the optimization of photoactivity of TiO2/SiO2 mixture, received by a sol-gel technique. TiO2, due to its specific feature, was applied in the photocatalytic methods of removing toxic compounds from water and air. In the experiments there were used two designs - the fractional factorial design 25-1 (as the elimination one) and the central composite design (as the proper one). Following the data analysis from the elimination plan two variables were eliminated, which helped to simplify the research object.Among other uncommon applications of the design of experiments: the optimization of the conditions for the extraction of natural pigments used in dyeing food, the production of fatty acid methyl esters used as diesel oil substitutes (biodiesel) and the optimization of a supercritical fluid extraction methodology for the analysis of castor oil, should be mentioned.
6
Content available remote Optimization of the epoxidation process of (1Z,5E,9E)-1,5,9-cyclododecatriene to 1,2-epoxy-(5Z,9E)-5,9-cyclododecadiene withtert-buthyl hydroperoxide - the influence of technological parameters on the hydroperoxide conversion
60%
Lewandowski G. , Rytwińska E. , Milchert E.
Polish Journal of Chemical Technology
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2007
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tom 9
|
nr 3
105-107
EN
The optimization studies of the epoxidation process of (1Z,5E,9E)-1,5,9-cyclododecatriene (CDT) with tert-buthyl hydroperoxide (TBHP) over the molybdenum catalyst Mo(CO)6 were performed. The reaction was examined in terms of a uniform-rotatable design. Three factors were analyzed: the reaction time, CDT:TBHP molar ratio, and the molar concentration of the catalyst (Mo(CO)6). According to the design 20 experiments were performed at the constant temperature of 70°C.
7
Content available remote Optimisation of a stamping process by a design of experiment linked to a modal analysis of geometric defects
60%
Ledoux Y. , Samper S. , Favreliere H. , Formosa F. , Pairel E. , Arrieux R.
|
2006
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tom Vol. 6, no 1
5-17
EN
The aim of this work was to present a method that gives an optimized set of values for the process parameters in order to obtain stamped parts with the fewest defects. The springback, influenced by process parameters is one of the sources of defects. The process is simulated by the finite element method. A design of experiments is used to compute the mathematical model and to minimize the trials number. The defects are characterized by a set of modal shapes. A defect criterion is calculated from this decomposition. Then an optimization is made by minimizing of this criterion in order to obtain the best process parameters. An example is shown in order to explain the method.
PL
Celem pracy jest optymalizacja procesu kształtowania wytłoczek ze względu na możliwość eliminacji skutków sprężystych odkształceń powrotnych. Zastosowanie planowania eksperymentu (MES) jako eksperymentu wirtualnego oraz analizy modalnej w celu oceny kształtu wytłoczki umożliwiają wyznaczenie parametrów tłoczenia zapewniających dużą dokładność kształtu wytłoczki.
8
Content available remote Comparative Studies of Electrospinning and Solution Blow Spinning Processes for the Production of Nanofibrous Poly(L-Lactic Acid) Materials for Biomedical Engineering
60%
Wojasiński M. , Pilarek M. , Ciach T.
Polish Journal of Chemical Technology
|
2014
|
tom 16
|
nr 2
43-50
EN
Comparative statistical analysis of the infiuence of processing parameters, for electrospinning (ES) and solution blow spinning (SBS) processes, on nanofibrous poly(L-lactic acid) (PLLA) material morphology and average fiber diameter was conducted in order to identify the key processing parameter for tailoring the product properties. Further, a comparative preliminary biocompatibility evaluation was performed. Based on Design of Experiment (DOE) principles, analysis of standard effects of voltage, air pressure, solution feed rate and concentration, on nanofibers average diameter was performed with the Pareto’s charts and the best fitted surface charts. Nanofibers were analyzed by scanning electron microscopy (SEM). The preliminary biocompatibility comparative tests were performed based on SEM microphotographs of CP5 cells cultured on materials derived from ES and SBS. Polymer solution concentration was identified as the key parameter infiuencing morphology and dimensions of nanofibrous mat produced from both techniques. In both cases, when polymer concentration increases the average fiber diameter increase. The preliminary biocompatibility test suggests that nanofibers produced by ES as well as SBS are suitable as the biomedical engineering scaffold material.
9
Content available remote Effect of extruder parameters on mechanical properties of revulcanized ground rubber tire powder
41%
Maridass B. , Gupta B. R.
|
2007
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tom T. 52, nr 6
456-460
EN
Response Surface Methodology (RSM) was used to study the effects of processing parameters viz. barrel temperature and screw speed on the mechanical properties of revulcanized waste ground rubber tire powder from a counter rotating twin screw extruder. Central composite rotatable design (CCRD) for two variables at five levels was chosen as the experimental design. The following parameters were analyzed: rheometric maximum torque, tensile strength, elongation at break, stress at 100% elongation, hardness and tear strength. The results obtained after measuring the responses were fitted as two variable second order equations which were confirmed experimentally. Barrel temperature is found to be the more influencing factor than the screw speed. Optimum properties were predicted at temperature 197°C and screw speed 25rpm.
PL
Do badania wpływu parametrów procesu rewulkanizacji takich jak temperatura bębna i szybkość obrotów ślimaka na właściwości mechaniczne rewulknizowanego proszku z odpadów gumowych zastosowano metodologię analizy powierzchni odpowiedzi (RSM z ang. response surface methodology). Do sporządzenia planu eksperymentu wybrano metodę CCRD (z ang. central composite rotatable design) z dwiema zmiennymi na pięciu poziomach (tabela 1). Analizowano następujące właściwości rewulkanizatów: maksymalny moment obrotowy, wytrzymałość na rozciąganie (rys. 1-4), wydłużenie przy zerwaniu, naprężenie przy 100% wydłużeniu, twardość i wytrzymałość na rozerwanie. Wyniki pomiarów otrzymane jako „odpowiedź” badanego układu opisywano równaniami dwu zmiennych drugiego rzędu. Stwierdzono, że temperatura bębna jest czynnikiem bardziej wpływającym na właściwości produktu niż szybkość obrotów ślimaka. W wyniku analizy otrzymano prognozę optymalnych parametrów pracy wytłaczarki tj. temperaturę bębna równą 197°C, a szybkość obrotów ślimaka 25rpm.
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