This paper adopts a dual-point measurement technique to predict the resonance frequency and operation modes of a high speed rotor at different operating speed. The effect of balance policy on the operating mode shapes of a rotor has also been investigated. Displacement signals measured at two different points of a rotating shaft are used to estimate the operation mode shapes at the main operating frequency based on the definition of transmissibility function. To verify the feasibility of this technique, the dynamic parameters, i.e. natural frequencies, damping ratio and normal modes of a stationary rotor are measured in advance by applying the traditional frequency response method for comparison. The values of modal assurance criterion (MAC) and mode shape diagrams indicate that both methods are in a good agreement on the normal modes when the system is undamped or lightly damped. However, a significant difference is observed for highly damped modes. The dual-point measurement technique is applicable to investigate the effect of rotating speed on measured operation modes at different speed. Results indicate that the rotating speed may affect the dynamic parameters of a rotating shaft significantly. Furthermore, the dynamic unbalance effect on the response of a rotating shaft has also been studied in this thesis. Results indicate that the position of the unbalance is quite sensitive to the response of a rotating shaft. The sensitivity of unbalance and its position is dependent on the operation mode correspondence to the driving speed. The measured results indicate the dual-point measurement is quite available to study the dynamic responses of a rotating shaft or rotor.

Title:                                   Swedish companies and Russia just changed their                                            relationship status to “It is complicated” ­- A multi-case study about how Swedish B2B companies change commitments towards the turbulent Russian market to remain resilient                     Authors:                             Hannes von Dahn & Viktor Jakobsson   Supervisor:                        Niklas Åkerman   Examiner:                           Susanne Sandberg   Course:                              Business Administration III - Degree Project with specialization in International Business (Bachelor)   Problem:                            The sanctions against Russia and the decline of the oil price have created a complex situation. As a result of this the Swedish export dropped with 50% in just one year. This calls for research concerning how Swedish companies, changes their commitments in order to remain resilient on the turbulent Russian market.   Purpose:                             This study intends to study how Swedish B2B companies change their commitments concerning tangible resources, intangible resources and operation mode, to remain resilient in the Russian market.   Research Question:            How do Swedish B2B companies change commitments to remain resilient in the turbulent Russian market?   Methodology:                    This is a qualitative study, which is following a deductive approach. The research is a multi-case study consisting of four case companies.   Conclusion:                        Swedish B2B companies change their commitments to remain resilient in the turbulent Russian market. The result of this study shows that intangible commitments are both increased and decreased. Tangible commitments meanwhile, are decreased or put on hold, while changes concerning operation modes required less uncertain futures before being conducted.

The contents of this work investigate the capability of integrating the PT in applications by invoking the ratio of the throughput power to volume represented by the term: power density. The fundamentals of the PT are introduced in chapter two. In chapter three, the fundamental limitations of the PT's capability of transferring power to the load are studied. There are three major limitations: temperature rise due to losses during operation, electromechanical limits of material, and interactions with output rectifier. The analysis and estimation are then verified by experiments and calculations implemented on three different PT samples fabricated from three different manufacturers. The subject of chapter four is the behavior of the PT's power amplifier. This chapter concentrates on two main amplifier topologies, optimized based on the simplicity of structure and minimization of components (passive and active): class D and class E amplifiers. The operational characteristics of these amplifiers with the PT are then comparison. Methods to track the optimum frequency and discontinuous working mode of the PT are proposed as the approaches to improve the energy transfer of the PT. In chapter five, prototypes of four devices using a PT are developed and introduced as illustrations of the integration of PTs into practical applications: an igniter for high intensity discharge (HID) lamps, high DC voltage power supplies, and electronic ballasts for LEDs, and stand-alone ionizers for food sterilizers. Some concluding statements and ideas for future works are located in the last chapter - chapter six.

This thesis presents the experimental and theoretical studies of nonthermal and stable atmospheric-pressure glow discharges. With the excitation frequency in the kilohertz range, a uniform and stable glow discharge has been successfully produced in atmospheric helium without the usually indispensable dielectric barrier. For this barrier-free cold atmospheric discharge, there are two discharge events occurring, respectively, in the voltage-rising and the voltage-falling phases, and in general they compete with each other. This distinct feature is illustrated through a detailed fluid simulation. For direct current atmospheric glow discharges, their cathode fall region is shown to depend critically on the discharge current density. For atmospheric glow discharges excited at 13.56 MHz on the other hand, we present observations that after gas breakdown, the discharge evolves from the normal glow mode to the abnormal glow mode and then through the recovery mode back to the normal glow mode. The operation modes, namely the a mode and the y mode, in radio-frequency atmospheric glow discharges are investigated with a one-dimensional, self-consistent continuum model. This model is evaluated by comparing our numerical results with experimental data and other simulation results in literature. It is shown that gas ionization is volumetric in the a mode and localized in the boundary region between the sheath and the bulk plasma in the y mode. The stable operation regime in the a mode is found to have a positive differential conductivity, and can be expanded to higher discharge current density without compensating plasma reactivity by increasing the excitation frequency. Furthermore this plasma stability-reactivity balance is also studied for radio-frequency atmospheric glow microdischarges.

<p><strong>Introduction:</strong> In this investigation I have illustrated, teacher treatment in a mono-cultural pre-school class and in a multicultural pre-school.</p><p><strong>Purpose: </strong>The purpose of the study was to illustrate how educators go about it when they face bilingual children to see how they work in a comparative perspective. The purpose was answered, based on four questions relating to how teachers relate to the meeting with bilingual children, the approach teachers use, which operation mode the use, if the take advantage of children's traditions, and if there is any different in the teachers’ treatment of bilingual children in the mono-cultural pre-school class and in the multicultural pre-school.</p><p><strong>Theories: </strong>The theory is linked to the concepts like operation mode, inter-cultural approaches and communications.</p><p><strong>Methodology:</strong> The used methods are qualitative interviews with four pre-school, teachers where an interview guide with formulated questions and observations were used. The purpose of the working methods was to highlight teacher treatment of bilingual children to discover different approaches to meet the bilingual children.</p><p><strong>Conclusion: </strong>The study has shown that the multicultural pre-school working inter-culturally, they are taking advantage of children's home language that is lifted in the nursery and the children's background, while in the mono-cultural pre-school class, they meet bilingual children foremost to develop the Swedish language and they also show interest to the children's traditions. Teachers’ treatment leads to a growing confidence in the children and knowledge for the cultural background.</p>

Introduction: In this investigation I have illustrated, teacher treatment in a mono-cultural pre-school class and in a multicultural pre-school. Purpose: The purpose of the study was to illustrate how educators go about it when they face bilingual children to see how they work in a comparative perspective. The purpose was answered, based on four questions relating to how teachers relate to the meeting with bilingual children, the approach teachers use, which operation mode the use, if the take advantage of children's traditions, and if there is any different in the teachers’ treatment of bilingual children in the mono-cultural pre-school class and in the multicultural pre-school. Theories: The theory is linked to the concepts like operation mode, inter-cultural approaches and communications. Methodology: The used methods are qualitative interviews with four pre-school, teachers where an interview guide with formulated questions and observations were used. The purpose of the working methods was to highlight teacher treatment of bilingual children to discover different approaches to meet the bilingual children. Conclusion: The study has shown that the multicultural pre-school working inter-culturally, they are taking advantage of children's home language that is lifted in the nursery and the children's background, while in the mono-cultural pre-school class, they meet bilingual children foremost to develop the Swedish language and they also show interest to the children's traditions. Teachers’ treatment leads to a growing confidence in the children and knowledge for the cultural background.

Under the competitive situation of globalization, the competition and challenges that the enterprises are confronting now are more rigorous than in the past. The PCB industries in Taiwan had ever ranked the third biggest in the world. However, on account of the shifting of the manufacturing bases in the worldwide, in 2002 the PCB output value in China had taken the place of Taiwan and become the third biggest in the world. And in the course of PCB industry development in China, the PCB enterprises from Taiwan had also participated in it early or late. The main inducing reasons were because of the undeveloped markets, low labor and land cost. When the arising of new and developing markets has made the scale of the enterprises expand from the arrangement of single area (Taiwan) into regional areas (Asia), the management range of the enterprise has also expanded at the same time and the management and cost problems it derived and the related problems caused by the management risks due to obscure information will be coming up. Therefore, how to connect the nerve center of the enterprise with each subsidiary, logistic warehouses, customers and suppliers of the group and integrate and set up the information network of upper and lower reaching customers and manufacturers and subsidiary and establish a set of mode suitable for the implement of information plans of the group and for the organization management so as to achieve the goals of fast information obtaining, policy making and real-time reaction and enable the overall arrangement of globalization to elaborate multiple effects, which is the purpose of the study. The study has analyzed the management of supply chain, the global planning and management mode and the application and development of information technology and also proceeded extensive analysis and research from the industrial structure, characteristics of PCB and its future competition superiority. Under the information goal of enhancing enterprise¡¦s competition superiority, the study has proposed related suggestions from the organization and management dimensions and information technology and application support dimension. 1. On the organization dimension and the plan of organization functions, achieve centralized planning so as to conform to the company¡¦s overall biggest profits; to maintain and implement of the subsidiary in each area to conform to the effects of localization and discrepancy; to avoid excessive centralized management which will cause the ineffectiveness of operation in each subsidiary or the excessive independence of the area which will cause the difficulties of the overall information establishment standardization and integration. Therefore, in addition to the original vertical framework, it has increased the planning of investigation organization functions (horizontal organization) so as to assist to help with the management and operation among between multi-site companies. 2. On the management dimension, it has developed modes from information system according to five stages of work: (1) the system planning stage (2) the system analysis stage (3) the system development stage (4) the conduction stage of system duplication and (5) system maintenance stage to scheme discussion topics like multi-area resources integration, multi-area coordinated collaboration system and multi-area rights and duties of labor division to be developed into an information construction management mode. 3. On the dimension of information technology and application support, according to the trade object and trade conduct of the enterprise, it has advanced the framework o f enterprise¡¦s information operation strategy and logistics management. Besides, it has conferred the framework of the information integration according to the aspect of resources sharing among the group¡¦s subsidiary so as to achieve the goals of supporting enterprise¡¦s strategy development and management optimization. Eventually it has proposed the blueprint of PCB industry system construction, the steps of system construction, and the constructional labor division mode of information among regional subsidiary of the group to be offered for the trade to refer to this framework under such global operation strategy and logistics management to develop the information system of supporting the enterprise¡¦s core competition superiority.

The contents of this work investigate the capability of integrating the PT in applications by invoking the ratio of the throughput power to volume represented by the term: power density. The fundamentals of the PT are introduced in chapter two. In chapter three, the fundamental limitations of the PT's capability of transferring power to the load are studied. There are three major limitations: temperature rise due to losses during operation, electromechanical limits of material, and interactions with output rectifier. The analysis and estimation are then verified by experiments and calculations implemented on three different PT samples fabricated from three different manufacturers. The subject of chapter four is the behavior of the PT's power amplifier. This chapter concentrates on two main amplifier topologies, optimized based on the simplicity of structure and minimization of components (passive and active): class D and class E amplifiers. The operational characteristics of these amplifiers with the PT are then comparison. Methods to track the optimum frequency and discontinuous working mode of the PT are proposed as the approaches to improve the energy transfer of the PT. In chapter five, prototypes of four devices using a PT are developed and introduced as illustrations of the integration of PTs into practical applications: an igniter for high intensity discharge (HID) lamps, high DC voltage power supplies, and electronic ballasts for LEDs, and stand-alone ionizers for food sterilizers. Some concluding statements and ideas for future works are located in the last chapter - chapter six.

Gas supplying process for consumers needs sufficient share of energy for upstream, midstream and downstream purposes. In spite of a huge amount of great investments into the industry it is still available to improve the efficiency of energy usage inside the industry. The biggest share of energy consumption is within transportation sector. Optimization of operating conditions of gas pipeline is a one of the cheapest ways for reducing energy consumption. Optimization doesn’t need any investments into the industry. It works only within operating parameters. Adjustable operating parameters of a gas pipeline are operative pressure, rotation speed of compressors, amount of operating units, gas temperature after a compressor station and others. The energy consumption depends on the combination of the parameters which determine an appropriate operation mode to provide the particular gas flow through a pipeline, the maximum capacity, the minimum energy consumption and others. From energy saving point of view it is possible to reduce energy demand in the gas industry due to optimization of the operation mode. A few approaches to achieving energy reduction through optimization are investigated in this work and presented in this article, such as saving energy through changing of loading between compressor stations, varying the depth of gas cooling and changing the loading of gas pumping units. The results of analyzing inside the study model reflect the possibility for improving efficiency of gas trunk pipelines.

A produção de energia elétrica por fontes de geração distribuída (GD) vem se tornando cada vez mais presente no sistema elétrico de potência. De modo geral, os sistemas de GD conectados à rede de distribuição operam controlando potências ativa e reativa, enquanto que no modo isolado, a frequência e a tensão. Sendo assim, após a ocorrência de um ilhamento deve haver alteração no modo de operação da GD para garantir a estabilidade da frequência e da tensão no subsistema ilhado. Ainda, se o modo de operação não for alterado após o ilhamento, os dispositivos de proteção podem atuar desligando a GD. Portanto, o tempo decorrido até a alteração do modo de operação desempenha um papel importante na indicação se a GD permanecerá ou não em funcionamento após a ocorrência do ilhamento. Neste trabalho, são determinados os tempos máximos para chaveamento dos modos de operação de um grupo motor gerador diesel (GMG) operando como GD, utilizando controladores clássicos (CCs) e controladores fuzzy (CFs). Foram analisadas as influências do desbalanço entre as potências geradas e consumidas, do tipo de carga conectada ao subsistema ilhado e do comprimento do alimentador nos tempos máximos. Para evidenciar possíveis vantagens da estratégia de controle não linear, é utilizada uma metodologia na qual o ajuste dos ganhos dos CFs é realizado a partir dos ajustes de referência dos CCs. Devido ao ganho variável que a estratégia não linear adiciona às ações de controle, a utilização de CFs nas malhas do GMG permitiu maiores tempos de chaveamento para determinadas faixas de operação, quando comparado com a utilização de CCs. / Distributed generation (DG) is becoming more present in the electrical power system. In general, when a DG is connected to the grid, the DG works with the active and reactive power control loops. Therefore, after an islanding occurrence, the DG must change the operation control mode from power control to voltage and frequency control to maintain the system stability. If the operation mode is not changed after islanding, the protective devices are sensitized and the DG is disconnected. Therefore, the time elapsed until the operation mode changes has an important role in the indication if the DG remains in operation or not after islanding. In this work, the maximum times for switching the operating control mode of a diesel generator set, working as a DG, are analysed using a classical control strategy (CC) and a fuzzy control strategy (FC). The influence of the power imbalance, load types and the feeder distance on the maximum available time to switch the operation control mode is investigated. To highlight the advantages of a nonlinear control strategy, is used a methodology in which the tuning of the FCs gains is performed from the CCs which are used as reference. Due to the variable gain added by the nonlinear strategy, the FC allowed higher switching times than the CC.