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Aaltodoc Publication Archive
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7163 Publications
OpenAIRE 3.0 (OA, funding)
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  • Development of detectors and calibration methods for spectral irradiance and radiometric temperature measurements

    The research work, described in this thesis, has been carried out at the Metrology Research Institute of Helsinki University of Technology between 2000 and 2005. The research focused on the development of new detectors, calibration methods and their applications in optical radiometry. A new photodetector, which is based on three GaAsP Schottky-barrier photodiodes, has been introduced. The spectral properties of the GaAsP trap detector have been studied in the wavelength range between 200 ...

    Tilan vaikutus luovuuteen innovoinnissa

    In the OVET project we study, how space affects users’ creativity during innovation activity. The space covers physical, virtual and social aspects, including communication technology, usage of a space and people’s behaviour in a space. The core of the project is to develop a model and methods for evaluating space experience and creativity from user-centred point of view. The impact of space on creativity is studied by simulating innovation activity in different space combinations. OVET-pr...

    Analysis and modeling of surface-acoustic wave resonators

    This thesis discusses the analysis and simulation of surface-acoustic wave (SAW) resonators. SAW resonators constitute building blocks for radio-frequency SAW bandpass filters, which are widely employed in modern cordless and cellular telecommunication systems. Theoretical tools for the analysis and simulation of SAWs and SAW resonators are vital in the development of high-performance SAW devices. The carrying theoretical concept is the excitation of acoustic waves in periodic electrode a...

    Structural transformation and magnetic competition in Yb(Mn1-xFex)O3

    Structural and magnetic properties of the Yb(Mn1−xFex)O3 (0⩽x⩽1) system have been systematically investigated. Initial samples were prepared via a sol-gel method. A pure hexagonal phase was only obtained for samples with x⩽0.5. With high-pressure annealing, a pure orthorhombic perovskite phase was achieved for all the compositions. The Fe57 Mössbauer spectrum for x=0.5 shows that only Fe3+ ions exist in the system; there was no evidence of chemical inhomogeneities. With increasing x, the Néel...

    Effect of fiber wall chemistry on pulping processes of novel Eucalyptus hybrids

    This thesis investigates relevant issues regarding the use of Eucalyptus wood: the factors affecting energy consumption during wood defibration, with focus on fiber wall chemistry and the assessment of wood quality from a wide range of novel Brazilian Eucalyptus hybrids. The obtained results are reflected to mechanical and traditional chemical processes. Wood refining experiments were carried out in laboratory scale, with and without chemical pretreatment: alkaline peroxide mechanical pulp...
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