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Aineistot 41-60 / 1037

    • Position sensorless electrically excited synchronous motor drive for industrial use based on direct flux linkage and torque control 

      Niemelä, Markku
      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, ...

    • Fouling management and retention in nanofiltration of integrated paper mill effluents 

      Mänttäri, Mika
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 23.04.1999)
      Nanofiltration performance was studied with effluents from the pulp and paper industry and with model substances. The effect of filtration conditions and membrane properties on nanofiltration flux, retention, and fouling ...

    • Computational Techniques for Spectral Image Analysis 

      Hauta-Kasari, Markku
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 20.05.1999)
      Multispectral images are becoming more common in the field of remote sensing, computer vision, and industrial applications. Due to the high accuracy of the multispectral information, it can be used as an important quality ...

    • Size Effect and Notch Size Effect in Metal Fatigue 

      Makkonen, Matti
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 27.08.1999)
      It is a well known phenomenon that the constant amplitude fatigue limit of a large component is lower than the fatigue limit of a small specimen made of the same material. In notched components the opposite occurs: the ...

    • Use of neural networks in robot positioning of large flexible redundant manipulators 

      Rouvinen, Asko
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 06.10.1999)
      Deflection compensation of flexible boom structures in robot positioning is usually done using tables containing the magnitude of the deflection with inverse kinematics solutions of a rigid structure. The number of table ...

    • On the Application of Beam on Elastic Foundation Theory to the Analysis of Stiffened Plate Strips 

      Partanen, Teuvo
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 08.10.1999)
      The main objective of this thesis is to show that plate strips subjected to transverse line loads can be analysed by using the beam on elastic foundation (BEF) approach. It is shown that the elastic behaviour of both the ...

    • Design and analysis of a transversal-flux switched-reluctance-linear-machine pole-pair 

      Salo, Jussi
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.12.1999)
      The Switched Reluctance technology is probably best suited for industrial low-speed or zerospeed applications where the power can be small but the torque or the force in linear movement cases might be relatively high. ...

    • Reaction Kinetics and Viscosity Modelling in the Fusion Syntheses of Ca- and Ca/Mg-resinates 

      Sundqvist, Satu
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.12.1999)
      Rosin is a natural product from pine forests and it is used as a raw material in resinate syntheses. Resinates are polyvalent metal salts of rosin acids and especially Ca- and Ca/Mg- resinates find wide application in the ...

    • Lobbying as a Part of Business Management 

      Jokinen, Arto
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2000)
      Lobbying by companies and the management techniques of lobbying have been fairly unknown territory. This study explains different theories related to lobbying including major political, economic and mathematical theories ...

    • A novel procedure for establishing clinching parameters for high strength steel sheet 

      Varis, Juha
      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 ...

    • Assessing the technical competitiveness of printing papers 

      Jernström, Eeva
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2000)
      This dissertation studies the technical quality assessment of a printing paper. The theoretical framework basis on the customer value hierarchy concept and the product integrity concept. The experimental part of the research ...

    • Welding time models for cost calculations in the early stages of the design process 

      Vartiainen, Mika
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2000)
      It is generally accepted that between 70 and 80% of manufacturing costs can be attributed to design. Nevertheless, it is difficult for the designer to estimate manufacturing costs accurately, especially when alternative ...

    • On Effort Estimation in Software Projects 

      Vesterinen, Petri
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2000)
      Software engineering is criticized as not being engineering or 'well-developed' science at all. Software engineers seem not to know exactly how long their projects will last, what they will cost, and will the software work ...

    • Direct torque control of permanent magnet synchronous machines - analysis and implementation 

      Luukko, Julius
      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. ...

    • Mass transfer and particleinteractions in granular systems and suspension flows 

      Jalali, Payman
      Acta Polytechnica Scandinavica, Chemical Technology SeriesURN:ISSN:1239-0518 (09.10.2000)
      The purpose of this study was to investigate some important features of granular flows and suspension flows by computational simulation methods. Granular materials have been considered as an independent state ofmatter ...

    • The Role of Surfactant Properties of Extractants in Hydrometallurgical LiquidLiquid Extraction Processes 

      Jääskeläinen, Eduard
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 20.10.2000)
      The amphiphilic nature of metal extractants causes the formation of micelles and other microscopic aggregates when in contact with water and an organic diluent. These phenomena and their effects on metal extraction were ...

    • The effects of real time control of welding parameters on weld quality in plasma arc keyhole welding 

      Jernström, Petteri
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 08.12.2000)
      Joints intended for welding frequently show variations in geometry and position, for which it is unfortunately not possible to apply a single set of operating parameters to ensure constant quality. The cause of this ...

    • Multispectral image compression using the wavelet transform 

      Kaarna, Arto
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (11.12.2000)
      Multispectral images contain information from several spectral wavelengths and currently multispectral images are widely used in remote sensing and they are becoming more common in the field of computer vision and in ...

    • Rahavirta-analyysit, erityisesti kassavirtalaskelma, kunnan talouden ohjauksen apuvälineenä 

      Kotonen, Ulla Päivikki
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2001)
       The aim of this research was to determine whether a cash basis financial statement would give additional value for the financial management of a local government and whether the cash flow statement would assist in getting ...

    • Balanced Scorecardin implementointi ja käytön nykytila Suomessa 

      Toivanen, Jouko Ensio
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2001)
      Lisääntynyt Balanced Scorecardin käyttö herätti kiinnostuksen tutkia, mistä BSC:ssä oli oikein kysymys. Epäonnistumiset BSC-projekteissa vaikuttivat siihen, että haluttiin tutkia, mikä nykyisissä projektimalleissa oli ...