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Perspectives on business model experimentation in internationalizing high-tech companies
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 10.05.2019)The main research question addressed in this doctoral dissertation is “How do high-tech companies employ business model experimentation in their internationalization processes?” As the business model concept is itself ... -
Phase voltage control and filtering in a converter-fed single-phase customer-end system of the LVDC distribution network
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 19.11.2010)In recent years, the network vulnerability to natural hazards has been noticed. Moreover, operating on the limits of the network transmission capabilities have resulted in major outages during the past decade. One of the ... -
Photocatalytic degradation of pharmaceutical and person care products (PPCPs) by commercial and synthesized catalysts under UV irradiation
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 06.07.2023)Nowadays, with the rapid development of society, more and more chemical products have been developed and applied to people’s daily lives. Among them, pharmaceuticals and personal care products (PPCPs) are the ones that are ... -
Physico-chemical properties of sol-gel synthesized titanosilicates for the uptake of radionuclides from aqueous solutions
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 16.08.2016)Harnessing the power of nuclear reactions has brought huge benefits in terms of nuclear energy, medicine and defence as well as risks including the management of nuclear wastes. One of the main issues for radioactive ... -
Pienen matkailuyrityksen yrittäjän taival : Oppiminen yrittäjyysprosessissa
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (18.12.2007)Tämä tutkimus liittyy keskusteluun yrittäjyydestä, strategisesta prosessista ja kasvunmerkityksestä pienissä yrityksissä ja edelleen keskusteluun yrittäjästä oppijana, tilaisuuteen tarttujana ja toisaalta elämäntapaansa ... -
Pienten osakeyhtiöiden verosuunnittelu - empiirinen tutkimus
Acta Universitatis Lappeenrantaensis (Lappeenrannan teknillinen yliopisto, 26.03.2010)Tutkimuksen aiheeksi valittiin pienten osakeyhtiöiden verosuunnittelu. Tutkimuksen teoreettinen viitekehys perustui aiempaan laskentatoimen empiiriseen verotutkimukseen sekä laskentatoimen kontingenssiteoreettiseen ... -
Polymer surface modification by atomic layer deposition
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 19.12.2011)Current industrial atomic layer deposition (ALD) processes are almost wholly confined to glass or silicon substrates. For many industrial applications, deposition on polymer substrates will be necessary. Current deposition ... -
Position sensorless electrically excited synchronous motor drive for industrial use based on direct flux linkage and torque control
Tieteellisiä julkaisuja - Research reports (Lappeenranta University of Technology, 16.04.1999)Synchronous machines with an AC converter are used mainly in large drives, for example in ship propulsion drives as well as in rolling mill drives in steel industry. These motors are used because of their high efficiency, ... -
Possibilities and challenges of longitudinal studies in operations management
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 19.12.2011)Longitudinal studies are quite rare in the area of Operations Management. One reason might be the time needed to conduct such studies, and then the lack of experience and real-life examples and results. The aim of the ... -
Post-synthetic modification of metal-oxo clusters of metal-organic frameworks (MOFs) for aqueous applications
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.02.2024)The unreliable supply of critical materials, including rare earth elements (REEs), and greenhouse emissions associated with typical H2 production processes, force us to find alternative strategies for smoothing the transition ... -
Potential for Greenhouse Gas Emission Reductions by Using Biomethane as a Road Transportation Fuel
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 28.11.2014)The aim of this thesis is to study whether the use of biomethane as a transportation fuel is reasonable from climate change perspective. In order to identify potentials and challenges for the reduction of greenhouse gas ... -
Potentiometric titration as a method of determining the stoichiometric dissociation constants of weak acids from the thermodynamic dissociation constants of aqueous solutions at 298.15 K
Acta Polytechnica Scandinavica, Chemical Technology SeriesURN:ISSN:1239-0518 (1999)The simple single-ion activity coefficient equation originating from the Debye-Hückel theory was used to determine the thermodynamic and stoichiometric dissociation constants of weak acids from data concerning galvanic ... -
Power cycling lifetime estimation of IGBT power modules based on chip temperature modeling
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 11.12.2012)In this doctoral thesis, methods to estimate the expected power cycling life of power semiconductor modules based on chip temperature modeling are developed. Frequency converters operate under dynamic loads in most ... -
Power Electronic Converters in Low-Voltage Direct Current Distribution – Analysis and Implementation
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.12.2015)Over the recent years, smart grids have received great public attention. Many proposed functionalities rely on power electronics, which play a key role in the smart grid, together with the communication network. However, ... -
Power line communication in motor cables of variable-speed electric drives − analysis and
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 31.10.2008)Data transmission between an electric motor and a frequency converter is required in variablespeed electric drives because of sensors installed at the motor. Sensor information can be used for various useful applications ... -
Power quality improving with virtual flux-based voltage source line converter
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (05.03.2005)Line converters have become an attractive AC/DC power conversion solution in industrial applications. Line converters are based on controllable semiconductor switches, typically insulated gate bipolar transistors. Compared ... -
Power semiconductor nonlinearities in active du/dt output filtering
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 04.06.2014)This doctoral thesis introduces an improved control principle for active du/dt output filtering in variable-speed AC drives, together with performance comparisons with previous filtering methods. The effects of power ... -
Power-based electricity distribution tariffs providing an incentive to enhance the capacity effectiveness of electricity distribution grids
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 11.02.2022)Energy transition is reshaping the electricity sector at a fast pace. As a consequence, electricity distribution systems are facing profound changes because also customer loads are undergoing a significant development. In ... -
Power-line-communication-based data transmission concept for an LVDC electricity distribution network – Analysis and implementation
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.12.2013)Communications play a key role in modern smart grids. New functionalities that make the grids ‘smart’ require the communication network to function properly. Data transmission between intelligent electric devices (IEDs) ... -
Power-to-methanol via membrane contactor-based CO2 capture and low-temperature methanol synthesis
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 04.12.2020)In the power-to-methanol concept, methanol acts as a platform chemical facilitating the integration of renewable electricity and captured CO2 into the fuel and chemical value chains, helping to substitute fossil resources ...