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Minimizing Conducted RF-Emissions in Switch Mode Power Supplies Using Spread-Spectrum Techniques
(Lappeenranta University of Technology, 2004-03-12)
Switching power supplies are usually implemented with a control circuitry that uses constant clock frequency turning the power semiconductor switches on and off. A drawback of this customary operating principle is that the ...
Sliding Mode Control for Switched Mode Power Supplies
(2004)
Control applications of switched mode power supplies have been widely investigated. The main objective ofresearch and development (R&D) in this field is always to find the most suitable control method to be implemented in ...
ME - Mobile Electronic Personality
(2004-06-08)
Digital services require personal information for a variety of reasons. Due to advances in communication technology, new types of services are evolving alongwith traditional Internet services. Due to the diversity of ...
Introducing Basic Systematic Requirements Engineering Practices in Small Organizations with an Easy to Adopt Method
(2004-11-05)
Requirements-relatedissues have been found the third most important risk factor in software projects and as the biggest reason for software project failures. This is not a surprise since; requirements engineering (RE) ...
Computational and Experimental Analysis of Flow Field in the Diffusers of Centrifugal Compressors
(2004-11-26)
Centrifugal compressors are widely used for example in process industry, oil and gas industry, in small gas turbines and turbochargers. In order to achieve lower consumption of energy and operation costs the efficiency of ...
Analysis of torque and speed ripple producing non-idealities of frequency converters in electric drives
(2004-11-04)
Electric motors driven by adjustable-frequency converters may produce periodic excitation forces that can cause torque and speed ripple. Interaction with the driven mechanical system may cause undesirable vibrations that ...
Conflict-based Method for Conceptual Process Synthesis
(2004-10-15)
The changing business environment demands that chemical industrial processes be designed such that they enable the attainment of multi-objective requirements and the enhancement of innovativedesign activities. The requirements ...
Careers of Managers, Comparison between ICT and Paper Business Sectors
(2004-12-15)
The purpose of this study is to increase understanding of how the managers build their early career in information and communication technology industry (ICT business sector) and pulp- and paper industry (paper business ...
Fractional slot permanent magnet synchronous motors for low speed applications
(2004-12-20)
This study compares different rotor structures of permanent magnet motors with fractional slot windings. The surface mounted magnet and the embedded magnet rotor structures are studied. This thesis analyses the characteristics ...
Modeling and measuring organizational renewal capability
(2004-12-10)
Globalization and new information technologies mean that organizations have to face world-wide competition in rapidly transforming, unpredictable environments, and thus the ability to constantly generate novel and improved ...