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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 ...
Supply chain integration: studies on linking customer responsiveness and operational efficiency in logistics policy planning
(2004)
Abstract The research problem in the thesis deals with improving the responsiveness and efficiency of logistics service processes between a supplier and its customers. The improvement can be sought by customizing the ...
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 ...
Studies on integrating kinematic design method with mechanical systems simulation techniques
(2004)
Theultimate goal of any research in the mechanism/kinematic/design area may be called predictive design, ie the optimisation of mechanism proportions in the design stage without requiring extensive life and wear testing. ...
Comprehensive Study of Crystal Growth from Solution
(2004)
Crystal growth is an essential phase in crystallization kinetics. The rate of crystal growth provides significant information for the design and control of crystallization processes; nevertheless, obtaining accurate growth ...