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Polyhedral Outer Approximations in Convex Mixed-Integer Nonlinear Programming
Dissertations (Process Design and Systems Engineering. Online) (Åbo Akademi - Åbo Akademi University, 31.08.2018)This thesis is focused on a specific type of optimization problems commonly referred to as convex MINLP problems. The goal has been to investigate and develop efficient methods for solving such optimization problems. The ... -
Pressurized hot water flow-through extraction of birch wood
(Åbo Akademi - Åbo Akademi University, 13.03.2015)Effective processes to fractionate the main compounds in biomass, such as wood, are a prerequisite for an effective biorefinery. Water is environmentally friendly and widely used in industry, which makes it a potential ... -
Printable Cell Growth Platform for the Assessment of Biomaterial-cell Interactions : A Focus on Patterns and Mineral Pigments
(Åbo Akademi - Åbo Akademi University, 17.02.2023)Cell-decision making is a highly complex and tightly regulated process that depends on the extracellular environment. In their native conditions, cells sense the immediate surroundings and collect cues from the fluid ... -
Printed and Coated Functionality on Natural Fibre Based Substrates
(Åbo Akademi - Åbo Akademi University, 12.01.2018)Mass-produced, paper-based printed electronics can provide a solution for the manufacturing of flexible and disposable electronic applications of the future. Traditional recyclable, high throughput, and low-cost roll-to-roll ... -
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Production and testing of magnesium carbonate hydrates for thermal energy storage (TES) application
(Åbo Akademi University, 18.06.2021)I denna avhandling ingår både forskning inom koldioxidavskiljning och lagring genom mineralisering (CCSM) (carbon capture and storage by mineralisation, CCSM) och produktion av dess slutprodukt, magnesiumkarbonathydrat ... -
Production of magnesium carbonates from serpentinites for CO2 mineral sequestration : optimisation towards industrial application
(Åbo Akademi - Åbo Akademi University, 17.12.2015)Global warming is one of the most alarming problems of this century. Initial scepticism concerning its validity is currently dwarfed by the intensification of extreme weather events whilst the gradual arising level of ... -
Production of Mg(OH)2 from Mg-silicate rock for CO2 mineral sequestration
(Åbo Akademi - Åbo Akademi University, 13.12.2012)Sequestration of carbon dioxide in mineral rocks, also known as CO2 Capture and Mineralization (CCM), is considered to have a huge potential in stabilizing anthropogenic CO2 emissions. One of the CCM routes is the ex ... -
Production of γ-valerolactone, a green platform molecule
Acta technologiae chemicae Aboensia : 2023 A/1 (Institut National des Sciences Appliquées de Rouen & Åbo Akademi University, 28.06.2023)Non-renewable feedstock should be replaced with renewable resources in the production of energy, chemical commodities, and materials to increase sustainability. Biomass, especially 2nd generation biomass sources such as ... -
Properties of raw glazes - The impact of composition, firing and functional coatings
(18.09.2020)Raw glazes, i.e. glazes mixed from oxides and minerals, are cost-effective alternatives to fritted compositions for ceramics fired at a high peak temperature (> 1150 °C). Raw glazes are mainly used for sanitary ware and ... -
Quantitative Monitoring of Aerobic and Anaerobic Bioprocesses using Vibrational Spectroscopy
Dissertations published by Process Design and Systems Engineering (Åbo Akademi - Åbo Akademi University, 09.03.2018)In bioprocesses, living cells are used to produce biological materials of interest. Perhaps the most well‐known product produced in bioprocesses is penicillin. Implementing process analytical technologies (PAT) in bioprocesses ... -
Reactive dissolution of sedimentary rocks in flue gas desulfurization : modeling and experimental investigation
(Åbo Akademi - Åbo Akademi University, 10.12.2010)Svavel förekommer i kol och olja och oxideras vid förbränning till svaveldioxid (SO2). Årligen utsläpps stora mängder svaveldioxid som åstadkommer sura regn, minskning av stratosfäriskt ozon och sjukdomar. Av dessa orsaker ... -
Reactor Modelling for Fluid-Solid Systems
(Åbo Akademi - Åbo Akademi University, 13.10.2017)Reactor Modelling for Fluid-Solid Systems The aim of the present doctoral thesis is the development of reliable mathematical models for the simulation of fluid-solid reactors. The main idea was to elaborate a rigorous ... -
Reductive catalytic depolymerization of industrial lignin and hemicellulose – process development and intensification
Acta technologiae chemicae Aboensia : 2021 A/4 (Åbo Akademi University & Institut National des Sciences Appliquées de Rouen, 01.10.2021)Modern biorefinery aims at utilizing renewable feedstocks to make a wide range of products such as chemicals, biofuels, and biomaterials while leaving as little residue as possible. Lignocellulosic biomass is a promising ... -
Regioselective modification of galactose-containing polysaccharides in aqueous media
(Åbo Akademi - Åbo Akademi University, 25.10.2013)Biorefining is defined as sustainable conversion of biomass into marketable products and energy. Forests cover almost one third of earth’s land area, and account for approximately 40% of the total annual biomass production. ... -
Roll-to-roll processing of nanocellulose into coatings
(Åbo Akademi - Åbo Akademi University, 15.02.2018)Paper and paperboard consumption is growing worldwide. However, the demand for traditional graphic paper grades is dwindling in mature markets, e.g. Europe, due to an increasing influence of the electronic media. For a ... -
Segregation of powder mixtures in silos with particular reference to dry mineral-based construction materials
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Silicon-containing species in used lube oil re-refining
(Åbo Akademi - Åbo Akademi University, 23.03.2015)Nowadays, the re-refining of the used lube oils has gained worldwide a lot of attention due to the necessity for added environmental protection and increasingly stringent environmental legislation. One of the parameters ... -
Silk-inspired molecular design of bacterial nano-cellulose biomaterials
(Åbo Akademi University, 14.10.2020)In recent years, there has been a growing interest in the development of bio-inspired materials as they have the potential to offer improvements in the design of superior mechanical performance materials. Furthermore, the ... -
Solution-Processable Compact and Mesoporous Titanium Dioxide Thin Films as Electron-Selective Layers for Perovskite Solar Cells
(Åbo Akademi - Åbo Akademi University, 06.08.2020)Perovskite solar cells (PSCs) is a promising photovoltaic technology for low-cost electricity generation to fulfill future demands. However, the success of any photovoltaic device is highly dependent on the quality of its ...