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Tytuł:
Effect of an acetonized pyrolysis oil recycled from spent-car tires on coal flotation performance
Autorzy:
Hasanizadeh, Iman
Khoshdast, Hamid
Rahmanian, Ahmad
Asgari, Kaveh
Hassanzadeh, Ahmad
Powiązania:
https://bibliotekanauki.pl/articles/24085875.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal flotation
acetonized pyrolysis oil
ash rejection
experimental design
interaction effect
Opis:
In this paper, an extended Historical Data (HD) design was applied for evaluating the effect of an acetonized pyrolysis oil (PO) produced by pyrolysis of spent-car tires in coal. Experimental and statistical analyses were applied for examining the influence of some operating variables such as concentration of diesel oil (0, 10, and 20 L/t), pine oil (0.55, 0.1, and 1 L/t), and the pyrolysis oil (0, 10, and 20 L/t) as well as solid content of pulp (5, 10, and 15% (w/w)) on the yield and ash content of final concentrate. Fourier Transform Infrared Spectroscopy (FTIR) measurements showed that PO contained hydroxyl, aldehyde, aliphatic, and aromatic compounds. Based on the results of Analysis of Variance (ANOVA), the main effect of all variables, except concentration of pine oil, on the flotation responses were found significant. Batch flotation experimental results indicated that using pyrolysis oil resulted in a 2% increase in ash content and a 35% decrease of the yield, through a nonlinear trend. The curved behavior of flotation measures was due to the possible competitive adsorption between PO and diesel oil and nonselective interaction between pyrolysis oil and other reagents. The negative effect of PO on coal flotation efficiency was also ascribed to the interaction between hydrophilic groups in PO structure and the oxide nature of non-combustible materials of coal particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 163109
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional Factorial Design and Desirability Function-Based Approach in Spice Paprika Processing Technology to Improve Extractable Colour Stability
Autorzy:
Koncsek, Arnold
Szokol, Lajos
Krizsa, Vivien
Daood, Hussein G.
Helyes, Lajos
Veha, Antal
Szabo, Balazs P.
Powiązania:
https://bibliotekanauki.pl/articles/2019335.pdf
Data publikacji:
2022-03-01
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
spice-paprika
extractable colour
experimental design
accelerated shelf-life test
Opis:
The storage-stability of extractable colour in paprika powder is strongly influenced by the processing steps. The purpose of this research work was to decrease the degradation rate of extractable colour of paprika powders to 3-4 ASTA units/month and increase the shelf-life. Fractional factorial experimental design and desirability function-based approach was applied to moderate the adverse effect of the key-importance processing steps on colour agent content. Photochemical-accelerated shelf-life test was used for the empirically-based quality improvement. Post-harvest ripening, drying, sorting (seed content), milling and additives (paprika seed oil, tocopherol extract) were identified as important for the degradation rate of extractable colour. The colour stability was very sensitive to the milling and drying intensity, while proper setup of other processing steps compensated the adverse effect of drying and milling parameters. The supplementation with cold-pressed spice paprika seed oil was demonstrated as a natural way of colour stabilization. At the highest desirability value (0.986) the rate constant of accelerated colour stability test (k) and shelf-life time (θS[100ASTA]) were −0.494 ASTA units/day and 2326 days, respectively. Alternative factor level settings enabled taking into account processing-tradition and efficiency expectation. In these cases, desirability values and the predicted shelf-life were 0.5-0.8 and 712-918 days, respectively. Validation study showed that the real observed rate constant and shelf-life values met the predicted values and their 95% confidence interval.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 1; 91-100
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and Box-Behnken design optimization of microwave treatment of sulphidic gold flotation tailing
Autorzy:
Benli, Birgül
Baştürkçü, Hüseyin
Powiązania:
https://bibliotekanauki.pl/articles/2146937.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave heating
gold-bearing high sulfide concentrate
bulk flotation
optimization
Box-Behnken experimental design
Opis:
As raw minerals become scarcer every passing day, the need for the recovery of mine tailings becomes essential. This research highlights the use of microwave energy as a green alternative to otherwise environmentally harmful methods of ore tailing recovery. The obtained results indicate that a 1.4 ppm Au and 3.5 % S sample floated with Aeroflot 208 and Aerophine 3418A increased the concentration of tailings over 18 % S and 4 ppm, Au, for recovery yield, resulting in 84 % and 80 % recovery, respectively. After microwave irradiation, 90 % of sulphur removal was reached under the optimum conditions of 50 minutes of irradiation using 1000 W for 4 g of the sample. Overall with 96. 74 % correlation of the quadratic model using the Box-Behnken design and expressed coefficient R2 regression the model was proven to be suitable for heating and roasting processes of gold-bearing tailings.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 149929
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and optimization of friction stir stitching of AISI 201 stainless steel via Box-Behnken design methodology
Autorzy:
Ojo, Olatunji Oladimeji
Obasha, Isaac Ojo
Powiązania:
https://bibliotekanauki.pl/articles/23966629.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
ścierny ścieg mieszany
projekt eksperymentalny
stal nierdzewna
modelowanie
optymalizacja
friction stir stitching
experimental design
stainless steel
modeling
optimization
Opis:
The paper investigates the modelling and optimization of the notch-repaired/friction stir stitched AISI 201 stainless steel welds via the use of a non-consumable tool-based repair process. The repair process employs a sequential hopping-stitching approach. This approach involves the application of two intercepted and completely overlapped plunging actions of a probe-less titanium carbide tool to create an effective refilling and repair of the notched zone. Box-Behnken design (BBD) was employed for the experimental planning, modelling, and optimization of the notch-repair process. Tool rotational speed, penetration depth and dwell time of the tool were the studied process parameters while tensile strength was the response variable. A quadratic model was identified as the best model for the notch-repaired welds based on the combination of a low sequential P-value of 0.008216, a high lack of fit P-value of 0.931366, and a close to unity adjusted and predicted R-square values. The process parameter and their interaction effects on the tensile strength of the repaired notch were identified via the ANOVA analysis. Plunge depth (main effect) and interaction effect of tool rotational speed and dwell time had significant influences on the notch-repair process and the resultant tensile strength of the AISI 201 stainless steel. The visual representations of these effects were shown through the 2D elliptical contour and 3D response surface plots. The optimized process parameters were identified as 1215.9795 rpm, 0.40262212 mm, and 5.98706376 s while the resultant notch-repaired joint yielded a tensile strength of 886 MPa, which is close to the predicted value.
Źródło:
Production Engineering Archives; 2022, 28, 2; 132--140
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of sealing parameters of double-sealing pipeline repair clamp
Autorzy:
Zhao, Bingjie
Zhang, Shuli
Gao, Qijun
Miao, Canliang
Wang, Tongyu
Powiązania:
https://bibliotekanauki.pl/articles/2086977.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
seal
rubber
pressure
the orthogonal experimental design
Opis:
Considering the key equipment of the pipeline clamp repair technology, this paper analyzes design of the pipeline repair clamp. Based on the damaged pipeline repair requirements, the design of a double-sealing pipeline repair clamp is established. The subsea pipeline in the Bohai Bay is considered as an example to develop a finite element model of a double sealing structure and calculate the sealing capacity, targeting a sealing pressure of 6MPa. The parameters affecting the sealing capacity are studied. For circumferential sealing, the effects of distance between the rubber and the pipeline, distance between the ring and the pipeline, and the contact friction coefficient on the sealing capacity are analyzed. The design parameters of circumferential sealing are optimized by an orthogonal experimental design method. Further, the effect of the friction coefficient on the axial sealing capacity is studied, and design suggestions are put forward based on the analysis. The results of this study can provide guidance for the design and application of subsea pipeline repair clamps.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 333--346
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving Efficacy of Pre-Service Teachers in Educational Research Through Peer Review Process
Autorzy:
Bas, Gokhan
Powiązania:
https://bibliotekanauki.pl/articles/1964029.pdf
Data publikacji:
2021-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Peer review
effi cacy in educational research
pre-service teachers
quasi-experimental design
Opis:
The purpose of the present research was to examine the effect of peer review on educational research efficacy of pre-service teachers. A quasi-experimental design with a pretest-posttest control group was adopted, over a period of 12 weeks using peer review process in the experimental group and lecture-based teaching in the control group. The participants of the research consisted of pre-service teachers (n = 118), enrolled in the faculty of education of a middle scale public university in the Central Anatolia Region of Turkey. In collection of the data, “Self-Efficacy for Research Scale of Teachers” (SCRT), was used to examine pre-service teachers’ efficacy in educational research. According to the results, it was revealed that the experimental group in which the peer review process was conducted outperformed in the efficacy in educational research, compared to the control group. This result showed that peer review was more effective in the improvement of efficacy of pre-service teachers in educational research than the lecture-based teaching.
Źródło:
The New Educational Review; 2021, 63; 214-225
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of the Sublimation Textile Printing Process Using the Taguchi Method
Optymalizacja procesu druku sublimacyjnego na tekstyliach metodą Taguchi
Autorzy:
Kumar, Jeyaraman Anandha
Kumar, M. Senthil
Powiązania:
https://bibliotekanauki.pl/articles/1419905.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
knitted fabric
sublimation printing
experimental design
Taguchi design
water vapour resistance
dzianina
druk sublimacyjny
projekt eksperymentalny
projekt Taguchi
opór pary wodnej
Opis:
In this paper, printing parameters for the sublimation printing of polyester fabrics like the number of strokes, the sublimation paper weight in grams per square metre, the fusing temperature and time were optimised using the Tauguchi experimental design technique. In the evaluations the signal-to-noise ratio was used. Sixteen experiments were performed with respect to the L 16 Orthogonal array design for the Tauguchi approach. The results show a considerable improvement in the signal-to-noise ratio as compared to the initial conditions. Through this study, not only can optimum printing conditions for sublimation printed polyester fabr ics be obtained but also the significant factors that affect water vapour resistance.
W pracy zoptymalizowano, przy użyciu eksperymentalnej techniki projektowania Tauguchi, parametry druku sublimacyjnego tkanin poliestrowych, takie jak: liczba pociągnięć, gramatura papieru sublimacyjnego w gramach na metr kwadratowy, temperatura i czas stapiania. W ocenach wykorzystano stosunek sygnału do szumu. Przeprowadzono 16 eksperymentów w odniesieniu do projektu macierzy ortogonalnej L 16 dla podejścia Tauguchi. Wyniki wskazały na znaczną poprawę stosunku sygnału do szumu w porównaniu z warunkami początkowymi. Dzięki zaprezentowanym badaniom można nie tylko uzyskać optymalne warunki drukowania na tkaninach poliestrowych drukowanych sublimacyjnie, ale także uwypuklić istotne czynniki wpływające na odporność na parę wodną.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 1 (145); 75-79
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of constrained experimental designs on finite spaces for a modified Ek-optimality criterion
Autorzy:
Uciński, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1838172.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
constrained optimum experimental design
minimal sum of largest eigenvalues
generalized simplicial decomposition
optimal measurement selection
Opis:
A simple computational algorithm is proposed for minimizing sums of largest eigenvalues of the matrix inverse over the set of all convex combinations of a finite number of nonnegative definite matrices subject to additional box constraints on the weights of those combinations. Such problems arise when experimental designs aiming at minimizing sums of largest asymptotic variances of the least-squares estimators are sought and the design region consists of finitely many support points, subject to the additional constraints that the corresponding design weights are to remain within certain limits. The underlying idea is to apply the method of outer approximations for solving the associated convex semi-infinite programming problem, which reduces to solving a sequence of finite min-max problems. A key novelty here is that solutions to the latter are found using generalized simplicial decomposition, which is a recent extension of the classical simplicial decomposition to nondifferentiable optimization. Thereby, the dimensionality of the design problem is drastically reduced. The use of the algorithm is illustrated by an example involving optimal sensor node activation in a large sensor network collecting measurements for parameter estimation of a spatiotemporal process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 4; 659-677
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Irreproducibility –The deadly sin of preclinical research in drug development
Autorzy:
Pillai, S.K.
Kobayashi, K.
Michael, M.
Arumugam, M.
Powiązania:
https://bibliotekanauki.pl/articles/2098205.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
preclinical research
drug development
irreproducibility
statistical analysis
experimental design
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.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2020, 14, 4; 165-168
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced Treatment of Pre-treated Commercial Laundry Wastewater by Adsorption Process: Experimental Design and Cost Evaluation
Autorzy:
Veli, Sevil
Arslan, Ayla
Gülümser, Çisil
Topkaya, Eylem
Kurtkulak, Hatice
Zeybek, Şehriban
Dimoglo, Anatoli
İşgören, Melike
Powiązania:
https://bibliotekanauki.pl/articles/124786.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorbent synthesis
COD removal
experimental design
laundry wastewater
polymer supported composites
Opis:
In Turkey, the commercial laundry wastewater is usually discharged to the receiving water bodies and its reuse potential is ignored. This wastewater is grouped into the greywater due to their content of organic and inorganic pollutants. In recent years, the sequential processes have become more preferable in greywater treatment and reuse. In this study, a batch adsorption process was applied for further treatment of commercial laundry wastewater which is also pre-treated by means of the electrocoagulation process. In adsorption, two different composites of waste hazelnut shell derived activated carbons, which are supported with polyaniline (PAn/HS) and polypyrrole (PPy/HS), were used as adsorbents. The efficiency of the process was evaluated by means of an experimental design, and the response surface methodology was applied for this purpose. In the experiment with PAn/HS, the chemical oxygen demand (COD) 75% removal efficiency was accomplished with adsorbent dosage of 0.9 g, at pH 8, with 125 rpm mixing rate and for 77.5 min reaction time. For PPy/HS under the same experimental conditions, the COD removal efficiency was obtained as 20%. The utilization of waste hazelnut shell derived composites as adsorbents for commercial laundry wastewater treatment is a good alternative. The production costs of adsorbents were estimated as 0.70 USD/g and 3.21 USD/g for PAn/HS and PPy/HS, respectively. In terms of the production cost, the PAn/HS composite is approved more agreeable as adsorbents for commercial laundry wastewater treatment.
Źródło:
Journal of Ecological Engineering; 2019, 20, 10; 165-171
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Powiązania:
https://bibliotekanauki.pl/articles/109838.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
combined modeling
fuzzy logic
experimental design
coal classifier
industry
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.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 2; 504-515
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cultural-historical theory by Lev S. Vygotsy: Strategies of studies on children’s learning and development. From theory to change in practice
Kulturowo-historyczna teoria Lw S. Wygotskiego. Strategie badań rozwoju i uczenia się dzieci. Od teorii do zmiany w praktyce
Autorzy:
Filipiak, Ewa Maria
Powiązania:
https://bibliotekanauki.pl/articles/2139236.pdf
Data publikacji:
2019-01-04
Wydawca:
Wydawnictwo Naukowe Dolnośląskiej Szkoły Wyższej
Tematy:
metoda eksperymentalno-genetyczna
eksperyment nauczający (designexperiment)
myślenie teoretyczne
wczesna edukacja
kulturowo-historyczna teoria rozwoju Lwa S. Wygotskiego
CHAT
experimental and genetic method
design experiment
theoretical thinking
early education
Opis:
Lev S. Vygotsky’s cultural-historical theory of development did not only affect, in a special way, the understanding of cognitive development of an individual but it also introduced new procedures in research methodology. Procedures that allow one to uncover the potential of development residing in the maturing way of child functioning, in observing his forms of activities and engaged participation in task solution. An original “theory-method” by Vygotsky and methodological procedures connected with it – teaching experiment, genetic experiment - were applied to a research project run in the Department of Didactics and Culture of Education Studies (Developing teaching in early childhood education in line with Lev S. Vygotsky’s concepts - ACK, Narrative environment of play and learning - NEPL ). In the paper I shall focus on three problematic issues: (1) understanding of the development process and learning by Lev S. Vygotsky and under the cultural-historical approach; (2) presentation of original strategies of research on development and learning – design experiment, (3) application of these research procedures in projects recently run in the Laboratory of Educational Change – Centre for Studies on Development and Learning, a unit created at the Department of Didactics and Culture of Education of Kazimierz Wielki University in Bydgoszcz.
Kulturowo-historyczna teoria rozwoju Lwa S. Wygotskiego w sposób szczególny wpłynęła nie tylko na rozumienie procesu rozwoju poznawczego jednostki, ale także wprowadziła nowe procedury w metodologii badań. Procedury, które pozwalają odkryć potencjał rozwoju tkwiący w dojrzewającym sposobie funkcjonowania dziecka, obserwowanie jego form działalności i zaangażowanego uczestnictwa w rozwiązywaniu zadań. Oryginalną „teorio-metodę” Wygotskiego i związane z nią procedury metodologiczne: eksperyment nauczający,  eksperyment genetyczny, metodę podwójnej stymulacji, zastosowano w realizowanych w Katedrze Dydaktyki i Studiów nad Kulturą Edukacji projektach badawczych (Developing teaching in early childhood education in line with Lev S. Vygotsky ’s concepts – ACK, Narrative environment of play and learning – NEPL). W artykule skupię się na trzech wątkach problemowych: (1) rozumieniu procesu rozwoju i uczenia się według Lwa S. Wygotskiego i podejścia kulturowo-historycznego; (2) przedstawieniu oryginalnych strategii badań rozwoju i uczenia się – eksperymentu nauczającego; (3) zastosowaniu tych procedur badawczych w realizowanych ostatnio projektach w Laboratorium Zmiany Edukacyjnej – Centrum Badań nad Rozwojem i Uczeniem się, jednostce utworzonej przy Katedrze Dydaktyki i Studiów nad Kultura Edukacji UKW w Bydgoszczy.
Źródło:
Forum Oświatowe; 2018, 30, 2(60); 169-182
0867-0323
2450-3452
Pojawia się w:
Forum Oświatowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Analyses of Productivity Model Parameters for Process Improvement
Autorzy:
Hussain, Zahid
Powiązania:
https://bibliotekanauki.pl/articles/102354.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
statistical analyses
process modeling
experimental design
process improvement
analizy statystyczne
modelowanie procesów
projektowanie eksperymentalne
doskonalenie procesów
Opis:
Productivity modeling and validation is the assessment of data to establish scientific indications that a process is stable. The aim of this paper is to present a novel approach using statistical analyses for process improvement. This study highlights the process behavior of three different lathe machines unit with the intention to replace one of them. The research methodology has illustrated by producing a steel rod of 3.175 millimeter diameter based on 180 samples collected from each machine. For statistical data value analysis, MS Excel 2016 and Minitab 18 were utilized. The results showed that lathe machine 1 and 2 had an equivalent inconsistency, but significantly different data spreads. Similarly, the throughput for machine 2 was higher with greater variability as compared to machine 1 while machine 3 encountered a low rate of throughput. On the basis of the fallouts of the analysis, the research team has officially suggested to substitute lathe machine 3.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 2; 157-167
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on separation of oil and peptides from saline wastewaters with the use of ceramic membranes
Badanie separacji oleju oraz białek z wód zasolonych z zastosowaniem membran ceramicznych
Autorzy:
Ćwirko, Konrad
Tomczak, Elwira
Szaniawska, Daniela
Powiązania:
https://bibliotekanauki.pl/articles/125892.pdf
Data publikacji:
2019
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
experimental design
ceramic membrane
model oil wastewaters
model protein wastewaters
planowanie eksperymentu dwupoziomowego
membrany ceramiczne
modelowe roztwory wód zaolejonych
modelowe rozwory białek w wodzie
Opis:
The work evaluates the effect of main process parameters, i.e. transmembrane pressure, TMP and cross-flow velocity, CFV on oil and protein rejection ri and permeate flux JVi using 22 experimental design. The ultrafiltration experiments were carried out using pilot installation with tubular ceramic 300 kDa membrane and model oil-in-water and BSA - water solutions. Ultrafiltration data obtained using experimental design technique was used to determine the regression coefficients of polynomial equations. These equations give information on non-conjugated as well as conjugated effects of two operating parameters on ultrafiltration process of model oil and BSA water solutions. Moreover, these equations helped to determine optimal conditions for ultrafiltration process from the point of view of membrane permeability and selectivity. Furthermore they can be useful while assessing the experimental conditions of ultrafiltration in real complex systems such as oily wastewaters produced by petroleum industry or marine transport and waste brines produced by fish industry.
W pracy dokonano oceny wpływu parametrów procesowych, takich jak ciśnienie transmembranowe TMP oraz prędkość przepływu nadawy nad powierzchnią membrany CFV, na stopień odzysku oleju i białka ri oraz strumień permeatu Jvi z zastosowaniem planu czynnikowego dwupoziomowego. Doświadczenia prowadzono za pomocą pilotowej instalacji membranowej z ceramiczną membraną rurową o granicy rozdziału 300 kDa oraz modelowych roztworów oleju w wodzie oraz białka BSA w wodzie. Dane doświadczalne z przeprowadzonych procesów ultrafiltracji z zastosowaniem techniki planowanego eksperymentu zostały wykorzystane do określenia współczynników regresji równań wielomianowych. Równania te dostarczają informacji zarówno o niezwiązanym, jak i sprzężonym wpływie dwóch parametrów operacyjnych na proces ultrafiltracji modelowych roztworów wód zaolejonych oraz roztworów białka BSA w wodzie. Umożliwiają także określenie optymalnych warunków procesu ultrafiltracji z punktu widzenia przepuszczalności i selektywności membrany. Ponadto mogą być przydatne przy ocenie eksperymentalnych warunków tego procesu w układach rzeczywistych, takich jak ścieki zaolejone produkowane przez przemysł naftowy lub transport morski i solanki odpadowe produkowane przez przemysł rybny.
Źródło:
Proceedings of ECOpole; 2019, 13, 1-2; 9-16
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed scheduling of measurements in a sensor network for parameter estimation of spatio-temporal systems
Autorzy:
Patan, M.
Kowalów, D.
Powiązania:
https://bibliotekanauki.pl/articles/331122.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sensor network
distributed parameter system
parameter estimation
experimental design
sensor scheduling
sieć sensorowa
układ o parametrach rozłożonych
estymacja parametrów
projekt eksperymentalny
Opis:
The main aim of the paper is to develop a distributed algorithm for optimal node activation in a sensor network whose measurements are used for parameter estimation of the underlying distributed parameter system. Given a fixed partition of the observation horizon into a finite number of consecutive intervals, the problem under consideration is to optimize the percentage of the total number of observations spent at given sensor nodes in such a way as to maximize the accuracy of system parameter estimates. To achieve this, the determinant of the Fisher information matrix related to the covariance matrix of the parameter estimates is used as the qualitative design criterion (the so-called D-optimality). The proposed approach converts the measurement scheduling problem to a convex optimization one, in which the sensor locations are given a priori and the aim is to determine the associated weights, which quantify the contributions of individual gaged sites to the total measurement plan. Then, adopting a pairwise communication scheme, a fully distributed procedure for calculating the percentage of observations spent at given sensor locations is developed, which is a major novelty here. Another significant contribution of this work consists in derivation of necessary and sufficient conditions for the optimality of solutions. As a result, a simple and effective computational scheme is obtained which can be implemented without resorting to sophisticated numerical software. The delineated approach is illustrated by simulation examples of a sensor network design for a two-dimensional convective diffusion process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 39-54
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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