Search results for "Response surface method"

showing 5 items of 55 documents

Optimization methods for complex sheet metal stamping computer aided engineering

2010

Nowadays, sheet metal stamping processes design is not a trivial task due to the complex issues to be taken into account (complex shapes forming, conflicting design goals and so on). Therefore, proper design methodologies to reduce times and costs have to be developed mostly based on computer aided procedures. In this paper, a computer aided approach is proposed with the aim to offer a methodology able to solve very complex sheet metal stamping processes, in particular a progressive design approach based on the integration between numerical simulations and optimization methodologies is presented. In particular, Response Surface Method, Moving Least Squares approximation and Pareto optimal s…

EngineeringMathematical optimizationControl and Optimizationbusiness.industrymedia_common.quotation_subjectRestraining forceSheet stampingStampingComputer Graphics and Computer-Aided DesignIndustrial engineeringComputer Science ApplicationsSet (abstract data type)Response surface methodologyMoving least squares approximationControl and Systems EngineeringComputer-aidedQuality (business)Moving least squaresComputer-aided engineeringbusinessEngineering design processDesign methodsSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneSoftwaremedia_commonStructural and Multidisciplinary Optimization
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Recovery of oil with unsaturated fatty acids and polyphenols from chaenomelessinensis (Thouin) Koehne: Process optimization of pilot-scale subcritica…

2017

The potential effects of three modern extraction technologies (cold-pressing, microwaves and subcritical fluids) on the recovery of oil from Chaenomelessinensis (Thouin) Koehne seeds have been evaluated and compared to those of conventional chemical extraction methods (Soxhlet extraction). This oil contains unsaturated fatty acids and polyphenols. Subcritical fluid extraction (SbFE) provided the highest yield—25.79 g oil/100 g dry seeds—of the three methods. Moreover, the fatty acid composition in the oil samples was analysed using gas chromatography–mass spectrometry. This analysis showed that the percentages of monounsaturated (46.61%), and polyunsaturated fatty acids (42.14%), after appl…

FlavonoidPharmaceutical ScienceMass spectrometry01 natural sciencesGas Chromatography-Mass SpectrometryArticleAnalytical Chemistrylcsh:QD241-4410404 agricultural biotechnologylcsh:Organic chemistryResponse surface methodologyDrug DiscoveryPlant OilsProcess optimizationPhysical and Theoretical Chemistry<i>Chaenomelessinensis</i> (Thouin) Koehne seed oil; subcritical fluid extraction; response surface methodology; fatty acid composition; polyphenol contentMicrowavesRosaceaeChaenomelessinensis (Thouin) Koehne seed oil; Fatty acid composition; Polyphenol content; Response surface methodology; Subcritical fluid extraction; Organic Chemistrychemistry.chemical_classificationChromatography010405 organic chemistryPolyphenol contentExtraction (chemistry)Organic ChemistryPilot scalePolyphenols04 agricultural and veterinary sciences040401 food scienceChaenomelessinensis (Thouin) Koehne seed oil0104 chemical scienceschemistryChemistry (miscellaneous)PolyphenolFatty Acids UnsaturatedMolecular MedicineFatty acid compositionFatty acid compositionSubcritical fluid extractionPolyunsaturated fatty acid
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Optimisation of liquid rubber modified bitumen for road pavements and roofing applications

2020

Abstract Polymer Modified Bitumens (PMBs) are largely used for pavement and roofing membranes applications with Styrene-Butadiene-Styrene Block copolymer (SBS) playing a major role in both markets despite its constantly increasing price due to the rising demand for quality bitumen modifiers. On the other hand, there is an increasing trend of recycling end of life tyres generating Recycled Tyre Rubber (RTR) at affordable price. This investigation aims at engineering a modified bitumen with a combination of Liquid Rubber (LR), a homogeneous blend of 50–70% RTR pre-processed in combination with heavy oils, and a wax denominated Ethylene Bis Stearamide (EBS). In the first phase, the effect of L…

Recycled tyre rubberMaterials science0211 other engineering and technologiesEBS020101 civil engineering02 engineering and technologyAsphalt mixtures0201 civil engineeringEthylene bischemistry.chemical_compoundResponse surface methodologyNatural rubberRheology021105 building & constructionGeneral Materials ScienceResponse surface methodologyComposite materialCivil and Structural EngineeringPolymer modifiedWaxBuilding and ConstructionRoofing membranesLiquid rubberchemistryAsphaltLiquid rubbervisual_artvisual_art.visual_art_mediumSBS modified bitumenConstruction and Building Materials
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Purification of recovered phosphoric acid by extracting aluminium with di-2-ethylhexyl phosphoric acid

2021

AbstractThe extraction of aluminium from dilute phosphoric acid with di-2-ethylhexyl phosphoric acid (DEHPA) was optimized using response surface methodology. The optimization was based on the experimental three-level central composite face-centred design (CCF) and was conducted on real-life samples. The three variables included were pH, extractant concentration and aqueous to organic phase ratio (AO). Under the optimized conditions (pH 2.5, 0.6 M DEHPA and AO ratio 1:2), extraction efficiency of 99% for aluminium in four extraction stages is achieved. The purified phosphoric acid solution can then be utilized by the fertilizing industry. Stripping tests for organic phase loaded with alumin…

Stripping (chemistry)General Chemical Engineeringchemistry.chemical_elementDi-(2-ethylhexyl)phosphoric acidjätevesiBiochemistryIndustrial and Manufacturing Engineeringjätevesilieteresponse surface methodologychemistry.chemical_compoundoptimointiAluminiumMaterials Chemistryaewage sludgeResponse surface methodologyalumiiniwastewaterfosforiPhosphoric acidsaostusAqueous solutionPrecipitation (chemistry)Extraction (chemistry)General Chemistrysolvent extractionpintakemiatalteenottochemistryprecipitation agenterottaminen (tekniikka)optimizationNuclear chemistryChemical Papers
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Simultaneous detection of hazardous skin whitening agents in Indian cosmetic products using a green chromatographic technique

2021

The present work mainly highlights the simultaneous detection of four skin whitening agents i.e. hydroquinone (HQ), resorcinol (RS), catechol (CC) and 3,3′-dichlorobenzidine (DCB) in facial creams and body lotion. Among these, the first three are positional isomers of dihydroxybenzene so simultaneous separation is difficult with the conventional reverse-phase high-performance liquid chromatographic technique (RP-HPLC). The selected skin whitening agents were detected in facial cream and body lotion using micellar liquid chromatography coupled to a photodiode array detector (MLC-PDA). In the present study, optimization of the method was accomplished using response surface methodology (RSM) w…

Detection limitChromatographyQD71-142Correlation coefficientCentral composite designmicellar liquid chromatographycosmeticsResorcinolCosmeticsresponse surface methodologychemistry.chemical_compoundSkin whitening agentsskin whitening agentschemistryPulmonary surfactantResponse surface methodologyMicellar liquid chromatographyLotionResponse surface methodologyAnalytical chemistryMicellar liquid chromatographyJournal of Chromatography Open
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