Wszystkie pola: response surface analysis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Response Surface Analysis of the Compressive Strength of Self-Compacting Concrete Incorporating Metakaolin
Autorzy:: Busari, Ayobami
Dahunsi, Bamidel
Akinmusuru, Joseph
Loto, Tolulope
Ajayi, Samuel
Powiązania:: https://bibliotekanauki.pl/articles/102799.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: response surface analysis
metakaolin
self-compacting concrete
sustainable infrastructure
analiza powierzchni reakcji
beton samozagęszczalny
zrównoważona infrastruktura
Opis:: This research developed a mathematical model and optimization of materials for the development of metakaolin self-compacting concrete. This is in a bid to reduce the overall material quantity and cost towards sustainable infrastructural construction. To achieve the aim of this research, Response Surface Analysis (RSM) was used. Kaolinitic clay was De-hydroxylated at 750°C to form metakaolin. This was used as a partial replacement for cement at 0%, 5%, 10%, 15%, 20% and 25% weight of Portland limestone cement. Both strength and rheology properties of the developed metakaolin self-compacting concrete were assessed. To this end, slump flow, L-Box test and V-funnel test were carried out alongside the compressive strength using relevant standard. The result of the research revealed that at 15% addition of metakaolin the slump flow, passing ability and filling ability was unsatisfactory according to EFNARC standard. From the numerical optimization of the compressive strength, the maximum predicted compressive strength of 44.35 N/mm2 was obtained. At a low value of metakaolin addition (5–15%), the compressive strength increased as the age of the concrete increased from 3–150 days. The age with the optimum mechanical strength formation was 110 days with metakaolin addition of 52.73 kg. The result of this research provide a database for Engineers, Researchers and Construction workers on the optimum metakaolin required to achieve satisfactory mechanical strength in metakaolin self-compacting concrete.
Źródło:: Advances in Science and Technology. Research Journal; 2019, 13, 2; 7-13
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: How empathy and social entrepreneurial self-efficacy interact to affect social entrepreneurial intention: A polynomial regression with response surface analysis
Autorzy:: Le, Thi Loan
Pham, Huong Thao
Nguyen, Ngoc Duong
Powiązania:: https://bibliotekanauki.pl/articles/39829996.pdf
Data publikacji:: 2023
Wydawca:: Instytut Badań Gospodarczych
Tematy:: social social entrepreneurial intention
empathy
social entrepreneurial self-efficacy
polynomial regression
response surface analysis
Opis:: Research background: Previous studies have argued that empathy (EMP) is an important factor that enhances individuals’ intention to engage in social business. However, the effect of this factor on social entrepreneurial intention (SEI) is unclear (Ukil et al., 2023). Also, although numerous studies have explored the individual impacts of EMP and social entrepreneurial self-efficacy (SES) on SEI, there is a notable scarcity of research that delves into the combined influence of these two predictor variables on the intention to engage in social business. Purpose of the article: This study proposes that EMP does not only individually affect, but also interacts with other factors to influence the intention to start a social business. Therefore, this study aims to investigate how EMP and SES interact to promote SEI. Methods: Based on a survey dataset of 409 respondents in Vietnam, this study employed polynomial regression with response surface analysis to examine the complementary, balance, and imbalance effects of EMP and SES on SEI. Findings & value added: This study's results suggest complementary effects between EMP and SES on SEI. Specifically, this study finds that when EMP and SES are balanced at higher levels, SEI is higher, and when their imbalance increases in either direction, SEI is lower. In addition, this study finds that the degree of SEI is higher when individuals have high SES with low EMP compared to the other way round. The findings of this study enhance our understanding of the complexity of motivation and how it affects SEIs, revealing the complex interaction between EMP and SES in shaping these intentions within a multidimensional motivational framework.
Źródło:: Oeconomia Copernicana; 2023, 14, 4; 1341-1366
2083-1277
Pojawia się w:: Oeconomia Copernicana
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Image velocimetry and statistical analysis of a mesh-coupled axial blade distributor for mass transfer in a swirling bed
Autorzy:: Javed, Muhammad Asif
Shukrullah, Shazia
Naz, Muhammad Yasin
Sarfraz, Raja Adil
Powiązania:: https://bibliotekanauki.pl/articles/2055043.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: mesh-coupled distributor
blade inclination angle
particle image velocimetry
response surface analysis
Opis:: A mesh-coupled axial blade distributor was tested for fluidization of particles in a swirling fluidized bed. The bed velocity was estimated experimentally using a high-speed imaging device and MATLAB supported particle image velocimetry (PIV). The bed velocity was also predicted statistically with a response surface analysis method. During statistical analysis, the confidence interval of bed velocity remained between 0.49485 and 0.49998. The bed velocity was measured about 0.49741m/s and 0.538m/s through experimental and statistical methods, respectively. The experimental and statistical analysis revealed similar bed weights and superficial velocities with a slight difference of 6.4◦ in blade angles.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 779--790
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Self-Related Factors Explaining Double Standards in Assessing Emotional Costs of Victims Suffering from Severe and Trifling Offenses
Czynniki związane z Ja wyjaśniające „podwójne standardy” w zakresie szacowania emocjonalnych kosztów osób będących ofiarami poważnych i drobnych wykroczeń
Autorzy:: Dubas-Miciuk, Monika Maria
Miciuk, Łukasz Roland
Powiązania:: https://bibliotekanauki.pl/articles/34111946.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:: hostility
victim
self-enhancement
self-esteem
response surface analysis
wrogość
ofiara
autowaloryzacja
samoocena
analiza powierzchni odpowiedzi
Opis:: The role of emotions in moral behaviors is emphasized by many neuroscientists and philosophers. From psychological point of view, solving moral dilemmas is impossible in isolation from cognitive-emotional processes related to the self. This study aimed to test self-related factors explaining discrepancies in the judgement of hostility and sadness experienced by someone else’s victim and the judge’s own victim, suffering from severe and trifling offences. The research was conducted in both experimental and correlational paradigms, with response surface analysis (RSA) as a key method of data analysis. Total number of participants was 171. The following questionnaires were used: The Self-Motive Items (SMI), Self-Esteem Scale (SES), Ten Items Personality Inventory (TIPI-PL) and The Positive and Negative Affect Schedule – Expanded Form. According to the results, self-esteem is a predictor of (in)congruence of the levels of hostility attributed to victims suffering from severe offenses, while the motives of self-enhancement and self-assessment predict particular patterns of (mis)matches in the levels of hostility attributed to victims suffering from trifling offenses. Discussion of the findings deals, inter alia, with the role of self-perspective in effective recognition of other people's emotional states.
Rola emocji w ludzkiej moralności jest podkreślana przez wielu neuronaukowców i filozofów. Z psychologicznego punktu widzenia rozwiązywanie dylematów moralnych jest niemożliwe w oderwaniu od procesów poznawczo-emocjonalnych związanych z Ja. Niniejsze badanie miało na celu przetestowanie czynników związanych z Ja, potencjalnie wyjaśniających rozbieżności w zakresie szacowanych poziomów wrogości i smutku doświadczanych przez ofiary poważnych przestępstw i drobnych wykroczeń, w których wyobrażonym sprawcą była osoba dokonująca szacowania lub jakaś inna osoba. Badanie przeprowadzono w paradygmatach eksperymentalnym i korelacyjnym, przy czym kluczową metodą analizy danych była analiza powierzchni odpowiedzi (RSA). Przebadano 171 osób za pomocą takich kwestionariuszy, jak: Skala Motywów Autoewaluacyjnych (SMA), Skala Samooceny Rosenberga (SES), Polska Adaptacja testu Ten Items Personality Inventory (TIPIPL) oraz Skala Pozytywnego i Negatywnego Afektu – Wersja Rozszerzona (PANAS-X). Okazało się, że samoocena była predyktorem (nie)zgodności poziomów wrogości przypisywanych ofiarom poważnych przestępstw, podczas gdy motywy autowaloryzacji i samopoznania przewidywały określone wzorce (ro)zbieżności poziomów wrogości przypisywanych ofiarom drobnych wykroczeń. Dyskusja wyników dotyczy m.in. znaczenia perspektywy Ja dla skutecznego rozpoznawania stanów emocjonalnych innych ludzi.
Źródło:: Annales Universitatis Mariae Curie-Skłodowska, sectio J – Paedagogia-Psychologia; 2020, 33, 3; 105-122
0867-2040
Pojawia się w:: Annales Universitatis Mariae Curie-Skłodowska, sectio J – Paedagogia-Psychologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Optimization of process parameters of friction stir welded AA 5083-O aluminum alloy using Response Surface Methodology
Autorzy:: Jannet, S.
Mathews, P. K.
Raja, R.
Powiązania:: https://bibliotekanauki.pl/articles/202208.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: friction stir welding
optimization
Response Surface Analysis
Analysis of Variance
tensile strength
spawanie
tarcie
optymalizacja
RSA
wytrzymałość na rozciąganie
Opis:: A methodology was exhibited to create the experimental model for assessing the Ultimate Tensile Strength of AA 5083-O aluminum compound which is broadly utilized as a part of boat building industry by Friction Stir Welding (FSW). FSW process parameters, such as: tool rotational speed, welding speed, and axial force were optimized for better results. FSW was completed considering three-component 3-level Box Behnekn Design. Response surface Methodology (RSM) was implemented to obtain the relationship between the FSW process parameters and ultimate Tensile Strength. Analysis of Variance (ANOVA) procedure was utilized to check the aptness of the created model. The FSW process parameters were additionally streamlined utilizing Response Surface Methodology (RSM) to augment tensile strength. The joint welded at a rotational speed of 1100 rpm, a welding speed of 75 mm/min and a pivotal energy of 2.5 t displays higher tensile strength compared with different joints in comparison with other joints.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 851-855
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Ryszard Zieliński’s contribution to statistical optimization and fixed-precision estimation
Autorzy:: Męczarski, Marek
Powiązania:: https://bibliotekanauki.pl/articles/747417.pdf
Data publikacji:: 2012
Wydawca:: Polskie Towarzystwo Matematyczne
Tematy:: stochastic approximation, Kiefer-Wolfowitz procedure, gradient estimation, response surface analysis, simplex design, confidence set, stopping rule, fixed-precision estimation
aproksymacja stochastyczna, procedura Kiefera\--Wol\-fowitza, estymacja gradientu, analiza powierzchni odpowiedzi, plan sympleksowy, zbiór ufności, reguła zatrzymania, estymacja stałoprecyzyjna
Opis:: W tej części opisane będą wyniki Profesora Ryszarda Zielińskiego w dziedzinie klasycznej aproksymacji stochastycznej, analizy powierzchni odpowiedzi oraz konstrukcji zbiorów ufności o zadanej precyzji.
Professor Ryszard Zieliński's results in stochastic approximation, extremal experimental design in the framework of response surface analysis and fixed-precision set estimation are outlined. First, he proposed a randomized version of Fabian's (1967) gradient estimate in the Kiefer-Wolfowitz procedure, which reduced the number of required observations and improved the rate of convergence. Second, when considering response surface analysis and experimental designs for the gradient estimation, he constructed a randomized simplex design which resulted in the unbiased estimator. Third, he gave a method to construct confidence sets with prescribed accuracy (i. e. the width and the confidence level) by sampling independent copies of a process of interest. Professor Ryszard Zieliński's results in stochastic approximation, extremal experimental design in the framework of response surface analysis and fixed precision set estimation are outlined. First, he proposed a randomized version of Fabian's (1967) gradient estimate in the Kiefer-Wolfowitz procedure, which reduced the number of required observations and improved the rate of convergence. Second, when considering response surface analysis and experimental designs for the gradient estimation, he constructed a randomized simplex design which resulted in the unbiased estimator. Third, he gave a method to construct confidence sets with prescribedaccuracy (i. e. the width and the confidence level) by sampling independent copiesof a process of interest.
Źródło:: Mathematica Applicanda; 2012, 40, 2
1730-2668
2299-4009
Pojawia się w:: Mathematica Applicanda
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The Treatment of Hospital Wastewater Using Electrocoagulation Process – Analysis by Response Surface Methodology
Autorzy:: Salah Al-Shati, Ahmed
Alabboodi, Khalid O.
Shamkhi, Hassan A.
Abd, Zahraa N.
Emeen, Sara I. Mohammed
Powiązania:: https://bibliotekanauki.pl/articles/2202336.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: electrocoagulation
RSM
response surface methodology
COD removal
Opis:: Electrocoagulation (EC) can be defined a method utilized to remove pollutants from wastewater by applying an electric current to sacrificial electrodes. Many experimental variables like NaCl content (0–4 g/l), current density (5–25 mA/cm2), time (30–90 mins), and pH (4–10) that influence the removal efficiency regarding COD were considered. In the presented research, three distinct configurations related to electrodes, i.e. Al-Al, Fe-Al, and Fe-Fe, have been utilized to determine which was the most effective. RSM depending on BBD was utilized for optimizing various operational parameters with regard to HWW by use of EC. Maximum COD removal (97.9%) was reached at Fe-Al electrodes, NaCl (3.2 g/l), current density (24.7 mA/cm2), time (81.7 mins), and pH (7.4). COD removal (91.3%) was achieved at the Al-Al electrodes, NaCl (3.8 g/l), current density(23.5 mA/cm2), time-86.3 min, and Ph (7.7). At the Fe-Fe electrodes, the removal of COD (89.5%) was obtained at NaCl (2.3 g/l), current density (24.6 mA/cm2), pH 8.5, and time (86.9 min). This indicates that EC could remove pollutants from different types of wastewaters under many operating parameters and with arrangements of electrodes.
Źródło:: Journal of Ecological Engineering; 2023, 24, 1; 260--276
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Modeling and parametric optimization of friction stir welding of aluminium alloy AA7068-T6 using response surface methodology and desirability function analysis
Autorzy:: Bindu, M. D.
Tide, P. S.
Bhasi, A. B.
Ramachandran, K. K.
Powiązania:: https://bibliotekanauki.pl/articles/2086852.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: AA7068-T6
friction stir welding
response surface method
desirability function
zgrzewanie tarciowe z mieszaniem
metoda powierzchni odpowiedzi
funkcja spełnienia wymagań
Opis:: In this investigation, high specific strength precipitation hardenable alloy AA7068-T6 was joined using friction stir welding. Experiments were carried out using the three factor-three level central composite face-centered design of response surface methodology. Regression models were developed to assess the influence of tool rotational speed, welding speed, and axial force on ultimate tensile strength and elongation of the fabricated joints. The validity of the developed models was tested using the analysis of variance (ANOVA), actual and adjusted values of the regression coefficients, and experimental trials. The analysis of the developed models together with microstructural studies of typical cases showed that the tool rotational speed and welding speed have a significant interaction effect on the tensile strength and elongation of the joints. However, the axial force has a relatively low interaction effect with tool rotational speed and welding speed on the strength and elongation of the joints. The process variables were optimized using the desirability function analysis. The optimized values of joint tensile strength and elongation – 516 MPa and 21.57%, respectively were obtained at a tool rotational speed of 1218 rpm, welding speed of 47 mm/ min, and an axial force of 5.3 kN.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137936, 1--9
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analiza przemieszczeń poprzecznie obciążonego pala w trójwymiarowym ośrodku liniowo-sprężystym o cechach losowych
Displacement analysis of laterally loaded piles embedded in a three-dimensional linearly-elastic random medium
Autorzy:: Bauer, J.
Kozubal, J.
Puła, W.
Wyjadłowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/350368.pdf
Data publikacji:: 2009
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: pale fundamentowe
powierzchnia odpowiedzi
wskaźnik niezawodności
foundation pile
response surface
reliability index
Opis:: W artykule przedstawiono modelowanie probabilistyczne odkształceń pala pod wpływem sił poprzecznych działających w jego głowicy. Pal pogrążony jest w uwarstwionym ośrodku liniowo sprężystym o cechach losowych. Obciążenie pala jest traktowane jako losowe. Elementem nowym, w stosunku do znanych z literatury prac, jest podejście probabilistyczne dla modelu trójwymiarowego. Podstawę stanowi modelowanie trójwymiarowe za pomocą metody elementów skończonych. Uzyskuje się serie wyników odkształceń przy różnych wartościach parametrów podłoża. Wyniki te służą do skonstruowania powierzchni odpowiedzi, którą estymuje się za pomocą regresji nieliniowej poprzez specjalnie skonstruowany algorytm iteracyjny. Powierzchnia odpowiedzi umożliwia analizę niezawodności, polegającą na znajdowaniu prawdopodobieństw przekroczenia przemieszczeń dopuszczalnych przez głowicę pala oraz odpowiadających im wskaźników niezawodności. Stwierdzono decydujący wpływ losowych wahań obciążającej siły poziomej oraz modułu sprężystości wierzchniej warstwy podłoża na wartości wskaźników niezawodności.
The paper presents a probabilistic modelling of displacements of a foundation pile. The pile is subjected to lateral loading implemented in the pile's head. The pile is embedded in a layered linearly-elastic random medium. The loading is considered as a random variable. The probabilistic approach to this problem as a three-dimensional one constitutes a new result in comparison with other earlier published. The base of the solution is the three-dimensional modelling by the finite element method. A series of results can be obtained under various values of elastic characteristics of the medium under consideration. Next by a non-linear regression procedure a response surface is obtained. To get the final response surface an iterative algorithm has been applied. The final response surface allows a reliability analysis. The failure criterion is an exceeding of an allowable displacements threshold by deformed pile's head. By numerical examples a vital effect of the random variability of the lateral force as well as random variability of the elastic modulus of the upper layer has been demonstrated.
Źródło:: Górnictwo i Geoinżynieria; 2009, 33, 1; 65-74
1732-6702
Pojawia się w:: Górnictwo i Geoinżynieria
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Case study about economic order quantities and comparison of results from conventional EOQ model and response surface-based approach
Autorzy:: Yıldız, R.
Yaman, R.
Powiązania:: https://bibliotekanauki.pl/articles/406756.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: economic order quantity
Pareto analysis
response surface
demand forecasting
Opis:: This study involves the implementation of an economic order quantity (EOQ) model which is an inventory control method in a ceramic factory. Two different methods were applied for the calculation of EOQs. The first method is to determine EOQ values using a response surface method-based approach (RSM). The second method uses conventional EOQ calculations. To produce a ceramic product, 281 different and additive materials may be used. First, Pareto (ABC) analysis was performed to determine which of the materials have higher priority. Because of this analysis, the value of 21 items among 281 different materials and additives were compared to the ratio of the total product. The ratio was found to be 70.4% so calculations were made for 21 items. Usage value for every single item for the years 2011, 2012, 2013 and 2014, respectively, were obtained from the company records. Eight different demand forecasting methods were applied to find the amount of the demand in EOQ. As a result of forecasting, the EOQ of the items were calculated by establishing a model. Also, EOQ and RSM calculations for the items were made and both calculation results were compared to each other. Considering the obtained results, it is understood that RSM can be used in EOQ calculations rather than the conventional EOQ model. Also, there are big differences between the EOQ values which were implemented by the company and the values calculated. Because of this work, the RSM-based EOQ approach can be used to decide on the EOQ calculations as a way of improving the system performance.
Źródło:: Management and Production Engineering Review; 2018, 9, 3; 23-32
2080-8208
2082-1344
Pojawia się w:: Management and Production Engineering Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

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

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Skocz do pozycji: 12.

Tytuł:: Desulfurization of Crude Oil by Laboratory Developed Multipumping Flow Injection Analysis System with Optimization by Response Surface Methodology
Autorzy:: Hadi, Ahmed Abdulrazzaq
Ali, Ali Abdulkhabeer
Khathi, Mohammed Turki
Powiązania:: https://bibliotekanauki.pl/articles/2202370.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: multi-pumping flow system
desulfurisation
response surface
optimal conditions
Opis:: Sour crude oil is the crude oil that contains a high level of sulfur impurity. It can be toxic and corrosive. Before this lower-quality crude can be processed into other crude oil derivatives, the sulfur content must be reduced, raising the processing cost. A homemade semi-automated multipumping flow analysis system was constructed, consisting of several parts available on the local markets and at low economic costs to decrease the sulfur content of crude oil samples collected. The central composite design (CCD) and response surface methodology (RSM) have been used for modeling and optimization. The effects of the operational parameters, including polar and nonpolar solvent types, solvent flow rates (10–40 ml/min), mixing coil lengths (120–200 min), temperature (30–60 °C), and solvent entry time to the system (0–60 sec) were studied. Experimental and theoretical applications were made to determine the optimal sulfur content, which came out to be 1.438 and 1.395 wt.%, respectively. This system evaluated the effectiveness of the sulfur removal content for actual heavy crude oil by experimentally and theoretically to be 65.73 and 66.75% respectively. The semi-automated system was applied successfully to reduce the sulfur content in a highly sensitive and accurate way.
Źródło:: Journal of Ecological Engineering; 2023, 24, 2; 328--339
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Numerical modelling of structures with uncertainties
Autorzy:: Kahsin, M.
Powiązania:: https://bibliotekanauki.pl/articles/260542.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: wind turbine
offshore
FEA
modal analysis
dynamic coupling
sensitivity analysis
design of experiment
response surface method
Opis:: The nature of environmental interactions, as well as large dimensions and complex structure of marine offshore objects, make designing, building and operation of these objects a great challenge. This is the reason why a vast majority of investment cases of this type include structural analysis, performed using scaled laboratory models and complemented by extended computer simulations. The present paper focuses on FEM modelling of the offshore wind turbine supporting structure. Then problem is studied using the modal analysis, sensitivity analysis, as well as the design of experiment (DOE) and response surface model (RSM) methods. The results of modal analysis based simulations were used for assessing the quality of the FEM model against the data measured during the experimental modal analysis of the scaled laboratory model for different support conditions. The sensitivity analysis, in turn, has provided opportunities for assessing the effect of individual FEM model parameters on the dynamic response of the examined supporting structure. The DOE and RSM methods allowed to determine the effect of model parameter changes on the supporting structure response.
Źródło:: Polish Maritime Research; 2017, S 1; 125-132
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 14.

Tytuł:: Analysis of Factors Influencing Dry Sliding Wear Behaviour of Laser Remelted Plasma Sprayed Mo Coating Using Response Surface Methodology
Autorzy:: Manjunatha, S. S.
Manjaiah, M.
Basavarajappa, S.
Powiązania:: https://bibliotekanauki.pl/articles/356714.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: laser remelting
plasma spray
central composite design (CCD)
response surface methodology (RSM)
Mo coating
Opis:: Plasma spraying is a process widely used to fabricate wear resistant coatings. However, various problems are associated with plasma spraying out of which poor bonding strength between the coating and the substrate and the high porosity in the as sprayed coatings are of major concern. In order to eliminate these problems and enhance wear performance, the laser remelting process has been used. The laser remelting of plasma sprayed Mo coatings alters the wear mechanism and improves the wear resistance. The wear mechanism and wear volume loss depend on the applied load, sliding speed and sliding distance. Hence, an effort has been made to investigate the effect of process parameters on volume loss using Response Surface Methodology (RSM) based mathematical models. The experiments were planned as per Central Composite Design (CCD). The investigations revealed that the applied load was the most dominant factor affecting the volume loss of the coating. The sliding speed, sliding distance and interaction effects were considered as the next important parameters influencing the volume loss. The investigation also reveals that, the wear volume loss depends on two wear mechanisms, one being the formations of grooves along surface tribo films and other being fracture of splats with delamination of the coating.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 217-225
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki