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    Wyświetlanie 1-8 z 8
    Tytuł:
    Characterization and Optimization study of Epiphyllum oxypetalum extract as corrosion inhibitor for mild steel in 3 M H2SO4 solutions
    Autorzy:
    Emembolu, L. N.
    Onukwuli, O. D.
    Okafor, V. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030954.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Acid corrosion
    Epiphyllum oxypetalum extract
    Optimization
    Photochemical
    Response Surface Methodology
    Opis:
    This study investigated characterization of Epiphyllum oxypetalum (EO) leaf extracts and optimization of process variables on inhibition of mild-steel in 3 M H2SO4 aggressive environment. Response Surface Methodology (RSM) was employed to examine the influence of process variables namely acid concentration (1.0 – 3.0 mols), inhibitor concentration (0.2 – 1.0 g/l), time (1–10 hr) and temperature (303 -343K) on inhibition efficiency. The results of phytochemical screening showed that organic components present in EO extract as a good inhibitor. Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM) studies established the presence of active compounds and adsorption of leaf extracts on metal surface. The experimental data was statistically analyzed and regression equations for corrosion rate and inhibition efficiency generated. The optimum conditions were achieved at acid concentration of 1.00 mol, inhibitor concentration of 0.055 g/l temperature of 333K, and time of 2.750 hr. The optimization results revealed that inhibition efficiency of 82.93 % was obtained at optimum combination of the extract concentration, the acid concentration, the temperature and the immersion time. The inhibitive potentials of EO extract was found to impede the localized and uniform corrosion of mild steel in acidic media, showing that the Epiphyllum oxypetalum leaf extract is a good inhibitor for mild steel in acidic solutions.
    Źródło:
    World Scientific News; 2020, 145; 256-273
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Classification techniques and parameter optimization of Cyclone Continuous Centrifugal Separator for hematite ore
    Autorzy:
    Zhang, Pei
    Xie, Haiyun
    Jin, Yanling
    Chen, Jialing
    Zeng, Peng
    Li, Yuanhong
    Chen, Luzheng
    Liu, Dianwen
    Powiązania:
    https://bibliotekanauki.pl/articles/2200335.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hematite
    Cyclonic Continuous Centrifugal Separator
    CCCS
    classification
    Response Surface Methodology
    Opis:
    The Cyclonic Continuous Centrifugal Separator (CCCS) is a new type of separation equipment developed based on cyclonic continuous centrifugal separation technology and combined with the separation principle of the fluidized bed. Taking hematite as the research object, the main parameters and conditions of the best hematite classification were determined through the classification test by using CCCS. Based on the classification test, the significance order of each process parameter and their interaction with hematite classification efficiency of the underflow products was analyzed with the Response Surface Methodology, the optimal process parameter of hematite classification was obtained and a multiple regression equation was established. The optimized process conditions were as follows, feeding pressure 55.48 kPa, backwash pressure 9.79 kPa, and underflow pressure 31.94 kPa. Under these conditions, the average hematite ore classification efficiency of coarse fraction (-2~+0.15mm), medium fraction (-0.15~+0.074mm) and fine fraction (-0.074mm) were 85.08%, 65.10% and 51.41%, respectively, and the relative errors with the predicted values were 1.6%, 4.0% and 2.5%, respectively. The results showed that the analytical model has good predictive performance. This research provides a certain prospect for the application of Cyclonic Continuous Centrifugal Separation to hematite ore classification. it provides a reference for the application of the Response Surface Methodology in the classification of hematite by Cyclonic Continuous Centrifugal Separation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 158864
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and characterization of calcite for tannic acid adsorption: Optimization by response surface methodology coupled by Box-Cox transformation procedure
    Autorzy:
    Tangarfa, Mariam
    Hassani, Naoul Semlali Aouragh
    Alaoui, Abdallah
    Powiązania:
    https://bibliotekanauki.pl/articles/1447160.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcite
    tannic acid
    adsorption parameters
    optimization
    Response Surface Methodology
    Box-Cox transformation
    Opis:
    Calcite depression is the most effective physicochemical process to valorize fluorine mineral. This process is achieved by adsorption of tannic acid, as the commonly used reagent, onto calcite. Adsorption investigation is very important in mineral processing. The present work focuses on optimization of physicochemical parameters of tannic acid adsorption onto calcite. Experimental study is carried out by a response surface methodology based on Box-Behnken design. Obtained results are exploited to develop a statistical model. Analysis of variance and residuals are performed to check the significance of tested models. Among these models, Cox-Box model predicts very well the obtained experimental data. This model shows that initial tannic acid concentration and solution pH as well as their interactions are the most significant parameters. Optimal conditions are achieved using the obtained statistical model. The present investigation is an important preliminary step to better understand calcite flotation behavior using tannic acid as a depressant.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 3; 36-45
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of Cr3C2-25% NiCr Laser Alloyed Cast Iron in High Temperature Sliding Wear Condition Using Response Surface Methodology
    Autorzy:
    Jeyaprakash, N.
    Duraiselvam, M.
    Raju, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/351074.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Laser Surface Alloying
    LSA
    wear
    microhardness
    Analysis of Variance
    ANOVA
    Response Surface Methodology
    RSM
    Opis:
    The wear behaviour of Cr3C2-25% NiCrlaser alloyed nodular cast iron sample were analyzed using a pin-on-disc tribometer. The influence of sliding velocity, temperature and load on laser alloyed sample was focused and the microscopic images were used for metallurgical examination of the worn-out sites. Box-Behnken method was utilised to generate the mathematical model for the condition parameters. The Response Surface Methodology (RSM) based models are varied to analyse the process parameters interaction effects. Analysis of variance was used to analyse the developed model and the results showed that the laser alloyed sample leads to a minimum wear rate (0.6079 ×10–3 to 1.8570 ×10–3 mm3/m) and coefficient of friction (CoF) (0.43 to 0.53). From the test results, it was observed that the experimental results correlated well with the predicted results of the developed mathematical model.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1303-1315
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Designing Cement Mortars Modified with Cork and Rubber Waste Using Theory of the Experiment
    Autorzy:
    Dębska, Bernardeta
    Krasoń, Joanna
    Lichołai, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/124330.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    rubber waste
    cork waste
    cement mortars
    Design of Experiments
    DoE
    Response Surface Methodology
    RSM
    Opis:
    The article concerns the possibility of obtaining modified cement mortars and assessing their selected properties, i.e. bending and compressive strength, volume density of hardened mortars and water absorption. The modification consisted in a partial (0–50% vol.) substitution of sand by waste, crushed rubber, and cork. In the mortar design process, the theory of the experiment was used. The central composite design used available in the Statistica software package was response surface. This approach allowed to significantly reduce the number of experiments, reduce costs, and at the same time keep the maximum information about the mortars tested. The conducted research showed that waste materials can be an alternative to natural aggregates in the process of obtaining light mortars.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 9; 121-130
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Cutting Parameters on Quality of Surface Produced by Machining of Titanium Alloy and Their Optimization
    Badanie i optymalizacja parametrów skrawania wpływających na jakość powierzchni uzyskaną przy obróbce stopów tytanu
    Autorzy:
    -, Niharika
    Agrawal, B. P.
    Khan, I. A.
    Khan, Z. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/950698.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turning
    titanium alloy
    Response Surface Methodology
    RSM
    surface roughness
    toczenie
    stop tytanu
    metodologia powierzchni odpowiedzi
    chropowatość powierzchni
    Opis:
    Titanium alloy (Ti-6Al-4V) has been extensively used in aircraft turbine-engine components, aircraft structural components, aerospace fasteners, high performance automotive parts, marine applications, medical devices and sports equipment. However, wide-spread use of this alloy has limits because of difficulty to machine it. One of the major difficulties found during machining is development of poor quality of surface in the form of higher surface roughness. The present investigation has been concentrated on studying the effects of cutting parameters of cutting speed, feed rate and depth of cut on surface roughness of the product during turning of titanium alloy. Box-Behnken experimental design was used to collect data for surface roughness. ANOVA was used to determine the significance of the cutting parameters. The model equation is also formulated to predict surface roughness. Optimal values of cutting parameters were determined through response surface methodology. A 100% desirability level in the turning process for economy was indicated by the optimized model. Also, the predicted values that were obtained through regression equation were found to be in close agreement to the experimental values.
    Stop tytanu (Ti-6Al-4V) jest szeroko stosowany do budowy elementów turbinowych silników lotniczych i innych podzespołów samolotów, elementów złącznych w technice lotniczej i astronautycznej, wysokiej jakości części samochodowych, w technice okrętowej i medycznej, a także w sprzęcie sportowym. Niemniej, powszechne zastosowanie tego stopu jest ograniczone trudnościami z jego obróbką. Jednym z podstawowych problemów jest niska jakość obrabianej powierzchni, która charakteryzuje się znaczną chropowatością. Przedstawiona praca jest poświęcona badaniu wpływu parametrów skrawania, takich jak szybkość skrawania, szybkość posuwu i głębokość skrawania na chropowatość powierzchni uzyskaną w procesie toczenia stopu tytanu. Przy zbieraniu danych nt. chropowatości powierzchni wykorzystano planowanie eksperymentu metodą Boxa-Behnkena. Do określenia poziomu istotności parametrów skrawania zastosowano metodę analizy wariancji, ANOVA. Sformułowano także równania modelu, pozwalającego przewidzieć chropowatość powierzchni. Optymalne wartości parametrów skrawania wyznaczono, stosując metodę powierzchni odpowiedzi (RSM). Wartości parametrów wyznaczone na podstawie równań regresji są bardzo bliskie wartościom uzyskanym eksperymentalnie.
    Źródło:
    Archive of Mechanical Engineering; 2016, LXIII, 4; 531-548
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Spindle Palm Petiole Fiber Reinforced High Density Polyethyele Composites
    Autorzy:
    Nneka, Ejikeugwu L.
    Monday, Omotioma
    Nnaemeka, Omeje B.
    Uzoma, Eke R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839868.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Spindle palm petiole fiber
    Sodium hydroxide
    cellulose
    chemical composition
    Central Composite Design
    Response Surface Methodology
    tensile strength
    polyethylene
    Opis:
    The work is on the production of spindle palm petiole fiber reinforced high density polyethylene (HDPE) composites. The Spindle Palm Petiole Fiber (SPPF) and HDPE composites were produced using injection molding machine. SPPF were characterized to determine their chemical compositions. Central Composite Design (CCD) was applied as an optimization tool of RSM for cellulose and tensile strength. The chemical composition of the SPPF is cellulose (65%), hemicelluloses (17.1%) and lignin (14.1%). Surface modifications of the fiber enhanced the properties of the fiber. Quadratic model adequately described the relationship between percentage cellulose yield and variables: chemical concentration, mass/volume ratio and time. The cellulose content at optimal level is 60.3% at 3.5wt% concentration, 4g/l mass/volume ratio and time of 16hr. Also for the composite, the quadratic model described the relationship between tensile strength and temperature, fiber/polymer ratio and time. The optimum tensile strength of 42.0 Mpa was obtained at fiber/polymer ratio of 29wt%, temperature of 172 °C and time of 10 min. Water absorbed by the untreated fiber was high compared to the chemically treated fiber. The chemical treatment created a better interfacial bonding of SPPF/HDPE and this could be responsible for the observations.
    Źródło:
    World News of Natural Sciences; 2021, 38; 98-119
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the Fenton Oxidation of Synthetic Textile Wastewater Using Response Surface Methodology
    Optymalizacja utleniania odczynnikiem Fentona syntetycznych ścieków z produkcji tekstyliów przy zastosowaniu metody powierzchni odpowiedzi
    Autorzy:
    Thomas, M.
    Barbusiński, K.
    Kalemba, K.
    Piskorz, P. J.
    Kozik, V.
    Bąk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/234451.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    textile wastewater
    Fenton reagent
    Response Surface Methodology
    Anilan Blue
    Sodium Lauryl Sulphate
    ścieki tekstylne
    odczynnik Fentona
    metodologia powierzchni reakcji
    siarczan laurylowy
    Opis:
    This article presents the possibility of using the classical Fenton process (Fe(II)/H2O2) to purify synthetic textile wastewater (COD=1872 mg O2/dm3, TOC=660 mg/dm3) containing azo dye Anilan Blue GRL 250% (200 mg/dm3) and Sodium Lauryl Sulphate (SLS) as anionic surfactant at a concentration of 95 mg/dm3. Model studies were carried out using RSM, obtaining a good fit of approximated values to experimental values (R2=0.9461 and R2adj=0.7379). For optimal process parameters (pH 3, Fe(II) 0.85 g/dm3, H2O2 14.5 g/dm3), complete decolourisation (3) was achieved as well as a reduction in COD, TOC and SLS concentrations to 83%, 44% and 98%, respectively.
    W artykule przedstawiono możliwość zastosowania klasycznego procesu Fentona (Fe(II)/ H2O2) do oczyszczania syntetycznych ścieków tekstylnych (COD=1872 mg O2/dm3, TOC=660 mg/dm3), zawierających barwnik azowy Anilan Blue GRL 250% (200 mg/dm3) oraz surfaktant anionowy Sodium Lauryl Sulphate (SLS) o stężeniu 95 mg/dm3. Badania modelowe prowadzono z zastosowaniem RSM, otrzymując dobre dopasowanie wartości aproksymowanych do wartości doświadczalnych (R2=0.8795 oraz R2adj=0.7992). Dla optymalnych parametrów procesu (pH 3, Fe(II) 0,85 g/dm3, H2O2 14,5 g/dm3) uzyskano całkowite odbarwienie ścieków (3) oraz zmniejszenie wartości COD, TOC i stężenia SLS odpowiednio o 83%, 44% i 98%.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 6 (126); 108-113
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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