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A comparative performance study of four-pole induction motors and synchronous reluctance motors in variable speed drives
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (25.06.2003)Design aspects of the Transversally Laminated Anisotropic (TLA) Synchronous Reluctance Motor (SynRM) are studied and the machine performance analysis compared to the Induction Motor (IM) is done. The SynRM rotor structure ... -
A conceptual, holistic framework to overcome limitations and constraints of design in laser based powder bed fusion of metals: Case novel separation and purification units
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 14.12.2023)The advancements of digitization and the fourth industrial revolution has introduced several modern technologies, among which additive manufacturing (AM), known also as industrial 3D printing, has significant role. Additive ... -
A connected future : the influence of the Internet of Things on business models and their innovation
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 25.11.2022)This dissertation investigates the impact of the Internet of Things (IoT) on the adaptation of existing business models (BM) also referred to business model innovation (BMI) and the development of new BMs, to improve the ... -
A forecasting model of packaging costs : case plain packaging
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 02.12.2022)Businesses need to secure the continuity of their operations also in unforeseen events, where severe market disturbances are present. Risk assessments, including cost forecasting analyses, are needed to identify different ... -
A holistic approach to measuring open innovation: contribution to theory development
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 24.05.2018)Since its introduction more than 10 years ago, open innovation (OI) has become a popular topic in the academic literature and has been accepted by many practitioners. The paradigm incorporates recent tendencies in economic ... -
A mathematical study of fuzzy logic; an algebraic approach
LTKK Tieteellisiä julkaisuja - Research PapersURN:ISSN:0356-8210 (1994)Fuzzy set theory and Fuzzy logic is studied from a mathematical point of view. The main goal is to investigatecommon mathematical structures in various fuzzy logical inference systems and to establish a general mathematical ... -
A modelling approach for building blockchain applications that enables trustable inter-organizational collaborations
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 26.09.2022)Inter-organizational collaborations (IOCs) represent a significant aspect of any organization because organizations depend on each other to perform functions that are not part of their core competencies. There are trust ... -
A modified nominal stress method for fatigue assessment of steel plates with thermally cut edges
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.12.2015)Thermal cutting methods, are commonly used in the manufacture of metal parts. Thermal cutting processes separate materials by using heat. The process can be done with or without a stream of cutting oxygen. Common processes ... -
A modified structural stress method for fatigue assessment of welded structures
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (08.12.2006)Fatigue life assessment of weldedstructures is commonly based on the nominal stress method, but more flexible and accurate methods have been introduced. In general, the assessment accuracy is improved as more localized ... -
A multimethod examination of contributors to successful on-the-job learning for vocational students
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.12.2014)Rapid changes in working life and competence requirements of different professions have increased interest in workplace learning. It is considered an effective way to learn and update professional skills by performing daily ... -
A novel approachfor assessing the fatigue strength of ultrasonic impact treated welded structures.
URN:ISSN:1456-4491 Acta Universitatis Lappeenrantaensis (18.12.2007)It is commonly observed that complex fabricated structures subject tofatigue loading fail at the welded joints. Some problems can be corrected by proper detail design but fatigue performance can also be improved using ... -
A novel procedure for establishing clinching parameters for high strength steel sheet
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2000)The building industry has a particular interest in using clinching as a joining method for frame constructions of light-frame housing. Normally many clinch joints are required in joining of frames.In order to maximise the ... -
A Numerical Study of Forest Influences on the Atmospheric Boundary Layer and Wind Turbines
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 21.07.2017)In the past years, energy consumption in Finland was not fully covered by the energy produced in Finland, and approximately 20% of the total energy consumption was imported. Despite the suitable wind condition, the wind ... -
A project management office as a project organization’s strategizing tool
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 12.09.2019)Organizations are increasingly searching for ways to create value and enhance competitiveness. One way to increase the value contribution of an organization’s assets is to establish a project management office (PMO). A PMO ... -
A salt and alkali synergy for synthesising active carbons from lignin: porosity development and techno-economic assessment
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 22.08.2023)Active carbons (AC) are the most common and efficient adsorbents. Alkali activation (using NaOH or KOH) was found to be a promising method for AC production since it allows gaining large surface area, high yield and ... -
A Soft Contact Collision Method For Real-Time Simulation of Triangularized Geometries in Multibody Dynamics
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 27.05.2013)When modeling machines in their natural working environment collisions become a very important feature in terms of simulation accuracy. By expanding the simulation to include the operation environment, the need for a ... -
A study of combustion phenomena in circulating fluidized beds by developing and applying experimental and modelling methods for laboratory-scale reactors
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 22.12.2010)The results shown in this thesis are based on selected publications of the 2000s decade. The work was carried out in several national and EC funded public research projects and in close cooperation with industrial partners. ... -
A Study on Fractionation and Ultrafiltration of Proteins with Characterized Modified and Unmodified Membranes
LTKK Tieteellisiä julkaisuja - Research reportsURN:ISSN:0356-8210 (23.08.1996)Membrane filtration has become increasingly attractive in the processing of both foodand biotechnological products. However, the poor selectivity of the membranes and fouling are the critical factors limiting the development ... -
A Topological Approach to Fuzzy Sets
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (1999)This thesis presents a topological approach to studying fuzzy setsby means of modifier operators. Modifier operators are mathematical models, e.g., for hedges, and we present briefly different approaches to studying modifier ... -
Acidic dissolution of iron oxides and regeneration of a ceramic filter medium
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 14.12.2012)The dewatering of iron ore concentrates requires large capacity in addition to producing a cake with low moisture content. Such large processes are commonly energy intensive and means to lower the specific energy consumption ...