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Dynamic Model of a Small Once-Through Boiler
LTKK Tieteellisiä julkaisuja - Research papersURN:ISSN:0356-8210 (1996)In this study, a model for the unsteady dynamic behaviour of a once-through counter flow boiler that uses an organic working fluid is presented. The boiler is a compact waste-heat boiler without a furnace and it has a ... -
On the Reversed Brayton Cycle with High Speed Machinery
LTKK Tieteellisiä julkaisuja - Research papersURN:ISSN:0356-8210 (1996)This work was carried out in the laboratory of Fluid Dynamics, at Lappeenranta University of Technology during the years 1991-1996. The research was a part of larger high speed technology development research. First, there ... -
New Distance Transforms for Gray Level Image Compression
Tieteellisiä julkaisuja (Lappeenranta University of Technology, 27.04.1996)This thesis deals with distance transforms which are a fundamental issue in image processing and computer vision. In this thesis, two new distance transforms for gray level images are presented. As a new application for ... -
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 ... -
Choice of Optimal MembraneProcesses for Economical Treatment of Paper Machine Clear Filtrate
LTKK Tieteellisiä julkaisuja - Research papersURN:ISSN:0356-8210 (1997)In this thesis membrane filtration of paper machnie clear filtrate was studied. The aim of the study was to find membrane processes which are able to produce economically water of sufficient purity from paper machine white ... -
Ash Particle Erosion on Steam Boiler Convective Section
LTKK Tieteellisiä julkaisuja - Research PapersURN:ISSN:0356-8210 (1997)In this study, equations for the calculation of erosion wear caused by ash particles on convective heat exchanger tubes of steam boilers are presented. Anew, three-dimensional test arrangement was used in the testing of ... -
Competitor Information andCompetitive Knowledge Management in a Large Industrial Organization
LTKK Tieteellisiä julkaisuja - Research PapersURN:ISSN:0356-8210 (05.12.1997)Thisthesis supplements the systematic approach to competitive intelligence and competitor analysis by introducing an information-processing perspective on management of the competitive environment and competitors therein. ... -
The Effect of Operational Disturbances on Reliability and Operation Time Distribution of NCmachine Tools in FMS
Tieteellisiä julkaisuja - Research papers (Lappeenranta University of Technology, 12.12.1997)This thesis concentrates on studying the operational disturbance behavior of machine tools integrated into FMS. Operational disturbances are short term failures of machine tools which are especially disruptive to unattended ... -
Role of references in international industrial marketing : a theory-building case study about supplier’s processes of utilizing references
LTKK Tieteellisiä julkaisuja - Research Papers (Lappeenranta University of Technology, 16.12.1997)Scientific studies regarding specifically references do not seem to exist. However, the utilization of references is an important practice for many companies involved in industrial marketing. The purpose of the study is ... -
Ultrafine grinding of FGD and phosphogypsum with an attrition bead mill and a jet mill : optimisation and modelling of grinding and mill comparison
LTKK Tieteellisiä julkaisuja - Research Papers (Lappeenranta University of Technology, 22.12.1997)Fine powders of minerals are used commonly in the paper and paint industry, and for ceramics. Research for utilizing of different waste materials in these applications is environmentally important. In this work, the ... -
Analysis and Control of Excitation, Field Weakening and Stability in Direct Torque Controlled Electrically Excited Synchronous Motor Drives
Tieteellisiä julkaisuja - Research papers (Lappeenranta University of Technology, 1998)Direct torque control (DTC) is a new control method for rotating field electrical machines. DTC controls directly the motor stator flux linkage with the stator voltage, and no stator current controllers are used. With the ... -
Improving the Potentials of Logistics Processes: Identification and Solutions
Tieteellisiä julkaisuja - Research papers (Lappeenranta University of Technology, 21.10.1998)The importance of logistics for companies is a well known and justified issue. Today, enterprises are developing their logistics processes in order to match their products and services to the requirements of the most ... -
Electrochemical Characterisation of Filter Media Properties and Their Exploitation in Enhanced Filtration
LTKK Tieteellisiä julkaisuja- Research papers (30.10.1998)Streaming potential measurements for the surface charge characterisation of different filter media types and materials were used. The equipment was developed further so that measurements could be taken along the surfaces, ... -
Development a distributed simulation environment on a cluster of workstations
Tieteellisiä julkaisuja - Research papers (Lappeenranta University of Technology, 15.12.1998)Simulation has traditionally been used for analyzing the behavior of complex real world problems. Even though only some features of the problems are considered, simulation time tends to become quite high even for common ... -
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 ... -
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 ... -
Tuning the design procedures for laser processed microwave mechanics
Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (1999)This research has been focused at the development of a tuned systematic design methodology, which gives the best performance in a computer aided environment and utilises a cross-technological approach, specially tested ... -
Artificially Intelligent and Adaptive Methods for Prediction and Analysis of Superheater Fireside Corrosion in Fluidized Bed Boilers
URN: SSN:1456-4491Acta Universitatis Lappeenrantaensis (1999)Superheater corrosion causes vast annual losses for the power companies. With a reliable corrosion prediction method, the plants can be designed accordingly, and knowledge of fuel selection and determination of process ... -
Merchandising Strategies and Retail Performance for Seasonal Fashion Products
Acta Universitatis Lappeenrantaensis (Lappeenranta Univesity of Technology, 19.03.1999)This study presents mathematical methods for evaluation of retail performance with special regard to product sourcing strategies. Forecast accuracy, process lead time, offshore / local sourcing mix and up front / replenishment ... -
Salient Pole Synchronous Machine Modelling in an Industrial Direct Torque Controlled Drive Application
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 26.03.1999)Synchronous motors are used mainly in large drives, for example in ship propulsion systems and in steel factories' rolling mills because of their high efficiency, high overload capacity and good performance in the field ...
