Selaus syöttöajan mukaan kokoelmassa 2 Tekniikka
Viitteet 41-60 / 160
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A set of models for optimization of gas distribution networks : A study in Process and Systems Engineering
(Åbo Akademi - Åbo Akademi University, 14.06.2019)Natural gas is a fossil fuel with a high potential to become the bridging fuel in the transition towards a sustainable future because of its lower share of carbon compared to oil and coal. A growing popularity of LNG, ... -
Aspects on Robust Control and Identification
(Åbo Akademi - Åbo Akademi University, 31.05.2019)This thesis treats different aspects on robust controller design and model identification techniques. The controller design technique proposes frequency-domain specifications for achieving a fixed-structure controller with ... -
Numerical and experimental optimization analysis of a jaw crusher and a bubble column reactor
(Åbo Akademi - Åbo Akademi University, 29.05.2019)More and more awareness is now raising in terms of sustainability of industrial processes. Thus the necessity to improve energy efficiency of diverse devices or simplify process schemes arises. Therefore, the importance ... -
Initial Stages of Alkali Salt Induced High Temperature Corrosion Mechanisms : Experimental studies using a combination of chronoamperometry, scanning electron microscopy, X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry
(Åbo Akademi - Åbo Akademi University, 24.05.2019)Various environmental problems, such as global warming, are related to the extensive use of fossil fuels. To solve these environmental problems, several renewable energy resources (RES) to substitute fossil fuels have drawn ... -
Antibacterial surfaces produced by liquid flame spray deposition of silver nanoparticles
(Åbo Akademi - Åbo Akademi University, 24.05.2019)Healthcare associated infections (HAIs) are one of the major problems of modern healthcare. Pathogenic bacteria responsible for these HAIs are mostly transmitted via surfaces. Emphasis on preventive measures can cumulatively ... -
Valuable monomers and oligomers from hemicelluloses
Acta technologiae chemicae Aboensia : 2019 A/1 (Åbo Akademi - Åbo Akademi University, 03.05.2019)Current environmental problems such as global warming and climate change related to greenhouse gas emissions have enhanced industrially relevant research aimed towards a more sustainable future. The biorefinery concept ... -
Supramolecular design of cellulose-based hydrogel beads
(Åbo Akademi - Åbo Akademi University, 08.03.2019)The degree of polymerization (DP) of cellulose fibres is an important factor to consider during dissolution in water-based solvent system and to design further advanced biomaterials. The lower is the DP, the higher cellulose ... -
Aqueous-Phase Reforming of Renewable Polyols for Sustainable Hydrogen Production
(Åbo Akademi - Åbo Akademi University, 22.02.2019)Renewable biomass can be utilized for sustainable hydrogen production via aqueousphase reforming (APR), which implies catalytic conversion of aqueous solutions of alcohols and polyols over transition metals at comparably ... -
Three-dimensional printing of wood-derived biopolymers towards biomedical applications
(Åbo Akademi - Åbo Akademi University, 22.02.2019)Three-dimensional (3D) printing has shown promising potential in fabrication of complex tissue with a structural control from micro- to macro-scale, meeting the requirements of tissue engineering. Wood-derived biopolymers ... -
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 ... -
Catalytic transformation of algae, tall-oil fatty acids and triglycerides to renewable fuels and chemicals
(Åbo Akademi - Åbo Akademi University, 18.06.2018)It has become increasingly obvious that sustainable energy is becoming more engaging owing to the eventual depletion of the world reserves of fossil resources of energy and to the increase of the greenhouse gas emissions. ... -
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 ... -
Wood extractives in conifers : a study of stemwood and knots of industrially important species
(Åbo Akademis förlag - Åbo Akademi University Press, 23.02.2018)Throughout the years, extractives have been studied with various analytical methods, and it has been found that different tree species contain different types and amounts of extractive compounds. However, many studies have ... -
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 ... -
Hydrotropic process for green biorefinery applications
(Åbo Akademi - Åbo Akademi University, 19.01.2018)Biorefinery is a concept of sustainable biomass processing into several useful products, such as fuels, materials, power and chemicals. The necessity of more extensive biomass utilization is governed nowadays by the ... -
Functionalization of cellulosic fibers via adsorption of native and light-responsive polysaccharides
(Åbo Akademi - Åbo Akademi University, 17.01.2018)Pulp fibers are widely used in different types of everyday products. Even though the demand for newspaper and printing paper is declining, there is a clear growth in the consumption of such fiber-based products as specialty ... -
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 ... -
Engineering of novel cellulose-based biocomposites and biofoams
(Åbo Akademi - Åbo Akademi University, 15.12.2017)Biomass is a renewable feedstock for producing fine chemicals, polymers, energy, and a variety of commodities. Transformation of biomass into diverse valuable products is the key concept of a bioeconomy. Chemical and ... -
Fibre surface engineering using polysaccharide derivatives
(Åbo Akademi - Åbo Akademi University, 12.12.2017)In the search for new materials and innovative solutions, pulp fibres obtained from wood chips have gained attention during the last few decades because they can be converted into a wide variety of pulp-derived products. ... -
Fractionation of marine algae to its constituents towards valuable chemicals and energy products
(Åbo Akademi - Åbo Akademi University, 20.11.2017)There is an urgency for finding renewable resources for the replacement of fossil resources aiming at more environmentally friendly processing. The old concept of processing forestry biomass for pulp and paper that dominated ...