Selaus nimekkeen mukaan kokoelmassa Väitöskirjat
Aineistot 242-261 / 1037
-
Development of Measurement Systems in Scientific Research: Case Study
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 28.08.2015)In recent years, technological advancements in microelectronics and sensor technologies have revolutionized the field of electrical engineering. New manufacturing techniques have enabled a higher level of integration that ... -
Development of the EAST articulated maintenance arm and an algorithm study of deflection prediction and error compensation
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 30.06.2017)Experimental Advanced Superconducting Tokamak (EAST) is the world's first fully superconducting tokamak with a non-circular cross-section. In recent years, with increased device performance and experimental parameters, ... -
Differential evolution based classification with pool of distances and aggregation operators
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 15.05.2015)The objective of this thesis is to develop and generalize further the differential evolution based data classification method. For many years, evolutionary algorithms have been successfully applied to many classification ... -
Diffusion of Administrative Innovation: TQM Implementation and Effectiveness in a Global
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 04.04.2008)The main objective of this dissertation is to create new knowledge on an administrative innovation, its adoption, diffusion and finally its effectiveness. In this dissertation the administrative innovation is approached ... -
Digital collaborations and entrepreneurship – the role of shareconomy and crowdsourcing in the era of smart city
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 09.06.2016)The thesis begins with the classical cooperation and transfers it to the digital world. This work gives a detailed overview of the young fields of research smart city, shareconomy and crowdsourcing and links these fields ... -
Direct capture of CO2 from air using amine-functionalized resin - Effect of humidity in modelling and evaluation of process concepts
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 17.12.2021)Direct air capture (DAC) using adsorbents is a promising negative emissions technology if coupled with CO2 storage and is a viable option as a CO2 source for producing truly carbon-neutral synthetic fuels. However, if this ... -
Direct torque control of permanent magnet synchronous machines - analysis and implementation
Acta Universitatis Lappeenrantaensis (30.06.2000)The direct torque control (DTC) has become an accepted vector control method beside the current vector control. The DTC was first applied to asynchronous machines, and has later been applied also to synchronous machines. ... -
Direct-on-line axial flux permanent magnet synchronous generator static and dynamic performance
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (27.11.2007)In distributed energy production, permanent magnet synchronous generators (PMSG) are often connected to the grid via frequency converters, such as voltage source line converters. The price of the converter may constitute ... -
Dissolution of magnetite and hematite in acid mixtures
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 04.11.2022)As the quality of raw materials decreases and legislation tightens, interest in various alternative materials has grown. For example, raw materials often contain iron as an impurity, which must be removed before the actual ... -
Distance Transforms on Gray-Level Surfaces
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (15.06.2006)This thesis studies gray-level distance transforms, particularly the Distance Transform on Curved Space (DTOCS). The transform is produced by calculating distances on a gray-level surface. The DTOCS is improved by ... -
Distributed ControlArchitecture of Power Electronics Building-Block-Based Frequency Converters
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 26.10.2010)The increasing power demand and emerging applications drive the design of electrical power converters into modularization. Despite the wide use of modularized power stage structures, the control schemes that are used are ... -
Distributed energy resources in an electricity retailer’s short-term profit optimization
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 17.12.2015)Liberalization of electricity markets has resulted in a competed Nordic electricity market, in which electricity retailers play a key role as electricity suppliers, market intermediaries, and service providers. Although ... -
Drivers and Barriers of Collaboration in the Value Chain of Paperboard-Packed Consumer Goods
Acta Universitatis Lappeenrantaensis (Lappeenranta University Technology, 19.12.2008)Value chain collaboration has been a prevailing topic for research, and there is a constantly growing interest in developing collaborative models for improved efficiency in logistics. One area of collaboration is demand ... -
Dynamic analysis and parameter identification for robotic manipulators
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 20.11.2023)This paper presents a comparative advanced study on parameter identification and dynamic analysis of lightweight and heavy-duty robotic manipulators. The ultimate goal is to enhance the performance and control of these ... -
Dynamic Analysis Model of Spherical Roller Bearings with Defects
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 14.11.2014)Rolling element bearings are essential components of rotating machinery. The spherical roller bearing (SRB) is one variant seeing increasing use, because it is self-aligning and can support high loads. It is becoming ... -
Dynamic analysis of belt-drives using the absolute nodal coordinate formulation
Acta Universitatis LappeenrantaensisURN:ISSN :1456-4491 (06.04.2006)Belt-drive systems have been and still are the most commonly used power transmission form in various applications of different scale and use. The peculiar features of the dynamics of the belt-drives include highly nonlinear ... -
Dynamic analysis of flexible multibody systems using finite elements based on the absolute nodal coordinate formulation
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 19.10.2018)The computational analysis of mechanical systems has a wide array of applications and is therefore essential in many fields of modern industry. This dissertation studies the simulation of mechanical systems using the ... -
Dynamic analysis of rotating systems including contact and thermal-induced effects
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 16.10.2018)Rotor dynamics is a special field of structural dynamics focusing on the study and analysis of rotating structures. Practical applications for rotor dynamics are found in typical industrial rotating electrical machine ... -
Dynamic and thermal modeling of touch-down bearings considering bearing non-idealities
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 26.06.2020)In an active magnetic bearing (AMB) supported rotor, the touchdown bearings support the rotor in case of an electromagnetic field failure or a fault in the control system. In this work, a dynamic and thermal model of ... -
Dynamic Capabilities and Firm Performance
URN:ISSN 1456-4491Acta Universitatis Lappeenrantaensis (2005)Firms operating in a changing environment have a need for structures and practices that provide flexibility and enable rapid response to changes. Given the challenges they face in attempts to keep up with market needs, ...