Browsing PhD theses in Engineering and Sciences by Issue Date
Now showing items 61-80 of 112
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Teaching and learning for mathematical literacy
(Doctoral Dissertations at the University of Agder; no. 299, Doctoral thesis, 2020)This dissertation reports from research that investigates the nature of teaching and learning for mathematical literacy in three lower secondary schools in Norway. Mathematical literacy is a notion used to denote the ... -
Hybrid modeling and control of mechatronic systems using a piecewise affine dynamics approach
(Doctoral Dissertation at the University of Agder; no. 273, Doctoral thesis, 2020)This thesis investigates the topic of modeling and control of PWA systems based on two experimental cases of an electrical and hydraulic nature with varying complexity that were also built, instrumented and evaluated. A ... -
Mathematical Modelling and Analysis of Vehicle Frontal Crash using Lumped Parameters Models
(Doctoral Dissertation at the University of Agder; no. 261, Doctoral thesis, 2020)A full-scale crash test is conventionally used for vehicle crashworthiness analysis. However, this approach is expensive and time-consuming. Vehicle crash reconstructions using different numerical modelling approaches can ... -
Synthetic Esters in Hydraulic Valves
(Doctoral Dissertation at the University of Agder; no. 277, Doctoral thesis, 2020)Each year 35-37 million tons of lubrication is consumed. Hydraulic oils constitute 10.2% of the total lubrication consumption, and a large part of that is lost to leakage, hose burst and accidents. One way of reducing the ... -
Dynamics of undergraduate engineering students’ learning activities in mathematics in an online and in a blended environment
(Doctoral Dissertations at the University of Agder; no. 291, Doctoral thesis, 2020)This thesis reports from a research study which investigates the role of technology rich environments in undergraduate engineering students’ processes of learning mathematics. The research is founded within a naturalistic ... -
Motion Control of Hydraulic Winch Using Variable Displacement Motors
(Doctoral Dissertations at the University of Agder; no. 305, Doctoral thesis, 2020)To compete in the open market of the offshore crane industry, it is imperative for the manufacturer to continuously improve crane operability. In this context, the crane operability is expressed by means of a so-called ... -
Improving Energy Efficiency and Motion Control in Load-Carrying Applications using Self-Contained Cylinders
(Doctoral Dissertations at the University of Agder; no. 283, Doctoral thesis, 2020)Because of an increasing focus on environmental impact, including CO2 emissions and fluid spill pollution, inefficient hydraulic systems are being replaced by more environmentally friendly alternatives in several industries. ... -
An exploration of teaching and learning activities in mathematics flipped classrooms : A case study in an engineering program
(Doctoral Dissertations at the University of Agder; no. 271, Doctoral thesis, 2020)This research project is a case-study of three consecutive cohorts of engineering students being subject to the pedagogical approach of flipped classroom (Bergmann & Sams, 2012). The study, which is qualitative and based ... -
Non-convex Optimization for Resource Allocation in Wireless Device-to-Device Communications
(Doctoral Dissertations at the University of Agder; no. 293, Doctoral thesis, 2020)Device-to-device (D2D) communication is considered one of the key frameworks to provide suitable solutions for the exponentially increasing data tra c in mobile telecommunications. In this PhD Thesis, we focus on the ... -
Student meaning making in elementary algebra teaching : An in-depth study of classrooms in four countries
(Doctoral dissertations at the University of Agder; no. 258, Doctoral thesis, 2020)The research presented in this thesis is based on observations and analyses of classroom data from four countries. The data were collected through a collaboration of local research teams in Finland, Norway, Sweden and the ... -
Advances in Deep Learning Towards Fire Emergency Application : Novel Architectures, Techniques and Applications of Neural Networks
(Doctoral Dissertations at the University of Agder; no. 308, Doctoral thesis, 2020)Deep Learning has been successfully used in various applications, and recently, there has been an increasing interest in applying deep learning in emergency management. However, there are still many significant challenges ... -
Using Digital Hydraulics in Secondary Control of Motor Drive
(Doctoral Dissertations at the University of Agder; no. 265, Doctoral thesis, 2020-04-08)Due to the increased focus on pollution and global warming, there is a demand for energy efficient systems. This also applies to the offshore oil and gas industry. Normally used hydraulic systems tend to suffer from low ... -
Opportunities and Challenges when Students Work with Vocationally Connected Mathematics Tasks
(Doctoral Dissertations at the University of Agder; no. 309, Doctoral thesis, 2021)Students in vocational education in Norway take a compulsory mathematics course in the first year of their programme. This course offers opportunities for engaging with mathematics which can be highly relevant to practice ... -
Undergraduate students’ performance in mathematics : Individual and combined effects of approaches to learning, self-efficacy, and prior mathematics knowledge
(Doctoral Dissertations at the University of Agder; no. 312, Doctoral thesis, 2021)This dissertation concerns an exploration of factors that affect the learning outcomes of students in higher education mathematics. It is framed within a quantitative research paradigm in which the existence of personal ... -
The big slice phenomenon in Banach spaces. Diameter 2 properties, Daugavet- and delta-points
(Doctoral Dissertations at the University of Agder; no. 335, Doctoral thesis, 2021)Preliminary theory will be presented prior to each result. We begin, in Subsection 1.2.1, by discussing Müntz spaces, which is the focus of the two first papers, “Two properties of Müntz spaces” and “Octahedrality and ... -
Synthetic Micro-Doppler Signatures of Non-Stationary Channels for the Design of Human Activity Recognition Systems
(Doctoral Dissertations at the University of Agder; no. 333, Doctoral thesis, 2021)The main aim of this dissertation is to generate synthetic micro-Doppler signatures and TV-MDSs to train the HACs. This is achieved by developing non-stationary fixed-tofixed (F2F) indoor channel models. Such models provide ... -
Techno-Economic Performance Evaluation of Photovoltaic based Micro-Grid with Energy Management Strategies
(Doctoral Dissertations at the University of Agder; no. 313, Doctoral thesis, 2021)The operational performance of grid connected micro-grid system can be affected by many factors e.g. techno-economic sizing, appropriate energy management strategy, geographical locations, grid constrains and electricity ... -
An exploration of how social science students utilise an opportunity to learn about simulation-based research methods : A design-based study
(Doctoral Dissertations at the University of Agder; no. 326, Doctoral thesis, 2021)At the core of this thesis lies an exploration of how social science students utilise an opportunity to learn about Modeling and Simulation (M&S)-based research methods. The study is framed within the Cultural Historical ... -
Numerical modelling and validation of Hydrothermal liquefaction of Lignin. Shrinking core approach on particle decomposition and a comparative analysis of biocrude and HTL char
(Doctoral dissertations at the University of Agder;362, Doctoral thesis, 2021) -
Industrial Perception of a Human World : A Hitchhiker's Guide to Autonomy
(Doctoral Dissertations at the University of Agder; nr. 341, Doctoral thesis, 2021)For several decades, industrial automation has helped companies save money and increase workplace safety so that many repetitive and dangerous tasks may be performed in a cost-efficient and secure manner. These systems ...