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8597 Uppsatser om Power quality problems - Sida 51 av 574

Kollektivtrafikanalys av Frihamnen Göteborg. En studie av olika utbyggnadsscenarier och dess transportbehov vid en färdig utbyggnad av Frihamnen år 2040

The use of Power Line Communication, PLC, as a communication solution for Automated Meter Reading, AMR, is popular by utilities in Sweden and other parts of the world due to demands of accurate and fast meter reading. However the use of the electrical grid as a communication medium is complex and sometimes problematic. This report handles some of the issues and problems that are important to understand when using the grid as a communications medium. Focus is mainly on investigating high frequency distortion in the Kristianstad power grid own by C4energi caused by a frequency converter. Measurements on site are done to investigate signal damping in the grid, different configurations for the frequency converter and signal strength of the PLC-system.

Rådgivning, oberoende och kvalitet vid revision

Background: An accountant is supposed to secure that the information from a company is true and fair. Recently consulting, or giving advice, has grown to be a major part of an accountants daily work particularly in smaller companies which may have insufficient financial competence themselves. This means that an accountant occupies two parts, as an independent reviewer and as an initiated advisor, which have caused controversy. Purpose: The purpose is to outline and explain how the accountants and audit customers regard an eventual discrepancy between performing the audit and consulting, and to give suggestions how to manage this. The purpose is also to define what customers perceive as quality in consulting an auditor.

Fodder to ruminants within agroforestry systems in Rwanda - species and management

Rwanda is one of the poorest countries in the world and about 70-80 % of the population lives in rural areas. The land is strongly affected by land erosion which makes it difficult for the agriculture and food production. Agroforestry is a system where tree plantation is combined with livestock- and crop production. The system provides soil fertilization and binds the soil together. Some of the trees used in agroforestry systems are also used as fodder.

Visuell planering enligt Lean : Optimering av samordning i syfte att höjakvaliteten i grundläggningsprojekt

Construction production always contains different disciplines whose priorities andinterests can be very diverse. Good communication and coordination are essential tominimize misunderstandings and achieve good quality in the end result. This makesplanning a central part of the production management. In a world where conditionscan change as often as daily, being well prepared increases the opportunities to stayflexible and decrease negative effects of the changes.This study has been done in association with Skanska Foundations district North inStockholm in order to investigate how visual planning can be used in the productionmanagement to optimize the coordination and the quality.The history of Lean started at Toyota, but the concept are now spread over theworld and are used wide outside of the car industry nowadays. What?s challengingabout Lean in foundation projects is to embrace a long-term perspective and invest insolutions that are profitable in the longer term, instead of solve problems by onlytreating the symptoms.A holistic perspective is crucial in order to truly understand Lean.

Skrivsamarbete och produktion av elektroniska dokument i studiesammanhang

This thesis paper presents experiences and views on collaborative writing from interviews with university students. Analysis of these interviews, focusing on problems with coordination and technological tools,  shows that problems to some extent can be avoided with knowledge of the tools used and knowledge of coordination..

Arbetsberedningar i syfte att öka delaktighet och tillvaratagande av kompetens bland yrkesarbetare -Utvärdering av ett nytt arbetssätt för Skanska Region Hus Göteborg

The use of Power Line Communication, PLC, as a communication solution for Automated Meter Reading, AMR, is popular by utilities in Sweden and other parts of the world due to demands of accurate and fast meter reading. However the use of the electrical grid as a communication medium is complex and sometimes problematic. This report handles some of the issues and problems that are important to understand when using the grid as a communications medium. Focus is mainly on investigating high frequency distortion in the Kristianstad power grid own by C4energi caused by a frequency converter. Measurements on site are done to investigate signal damping in the grid, different configurations for the frequency converter and signal strength of the PLC-system.

Förstudie för kvalitetssäkringav glidande förband vid Hissmoforsvattenkraftsstation : -Specifikt för aggregat G6 och G7

Jämtkraft AB which is a power production company in Sweden has bought two newhydro power units to their station in Hissmofors. The two new generators are using aconcept with sliding stator feet to handle the thermal expansion.The concept with sliding stator feet on hydro electric generators has not beenworking satisfactory on many hydro power stations in Sweden and has caused a lot ofcosts due to long downtimes.The new station in Hissmofors is very important for Jämtkraft AB, and therefore theywant to know how to make sure that the sliding stator feet are working as theyshould. According to theories and a simplified model of the generator the stator feetdisplacement should be around 1 -1,6 mm.The generators are delivered with a surveillance system that will measure thedisplacement of the sliding stator feet. The signal from the system isn?t accessible forJämtkraft AB but it will alarm when the sliding stator feet are malfunctioning.To secure the function of the sliding feet a logger for the surveillance system or adifferent measurement system must be used; if both systems are used Jämtkraft cansecure the function of the surveillance system..

Hur kvalitetsstyrning kan förebygga avvikelser i en terminalprocess.

In todays competitive business climate the concept of ?quality management? is a significant part of daily work for many companies, as they want to achieve high performance quality and delivery success. Within the services sector third-party logistics companies play an increasingly central role when it comes to the goods that are being transported. These companies are presented with continuous challenges to ensure that goods are loaded on trucks efficiently and delivered on time, at the right place and in the right condition. The present case study was conducted in collaboration with Schenker AB and Schenker Åkeri in Jönköping, to help these two company branches serving under the same major corporation to solve a common problem they both encounter, namely the fact that it regularly occurs handling abnormalities in the terminal process that affects overall quality for customers.The study aims to find out how the daily quality control concerning the handling of goods in the terminal process can be improved hopefully resulting in a higher quality in cargo shipments.

Om detta är en psykiskt funktionshindrad. : - Diskurs, makt och subjekt i psykiatrireformen 1995

This study aims to investigate the political reformation of the psychiatric care in Sweden, that took place 1995. The main purpose is to illuminate the transformation of subjectivity for mentally ill people after the reform 1995. The group of people which are present in the study are those who former were subjects of care in psychiatric hospitals, but with regarding to the reform have moved out from the institutions and instead become clients for community care. This new group of mentally ill people became, in connection with the reform, subjects for a new concept psykiskt funktionshinder. This new label and concept, that were attached to the present group, is the main concept for the investigation in the present study. The method, that was used in the study, develops a textual based analysis of the official documents, that were produced in connection with the political decision to reform the care of mentally ill people. With a theoretical conceptuality taken from Michel Foucault, with concepts such as discourse, power, and subjectivity, are the documents analysed in order to illuminate how the new subjectivity, under the concept of psykiskt funktionshinder arise.

"Varför är du här? Du kan ju inte dansa!" En uppsats om funktionshinder, annorlundaskap och makt

This essay is a qualitative study concerned with questions about disability. I set out from a definition of disability which highlights non-disabled peoples´ participation in making a disabled person ?the Other?. My aim is to contribute to an understanding of the experiences of disabled people as well as problemize the way that normality and disability is socially constructed. The empirical material of the essay consists of qualitative interviews with disabled men and women and the essay is written with a critical perspective.

Demokrati och vetenskap - ett problemfyllt förhållande

What role should science play in democracy? Political scientists often assume that it is possible to demarcate between ?instrumental? and ?moral? knowledge, and argue that citizens and/or politicians should use their moral knowledge to agree upon political goals and then apply the instrumental knowledge of scientists to achieve them. This straightforward view is challenged by writers in science studies, who identify three major problems in the use of science in democracy: uncertainty, risk and hidden values. They suggest that these problems could be solved through citizen participation.In this essay I perform an analysis of the internal logic of their suggestion. Is it likely that citizen participation enhances the democratic decision making process so as to reduce the problems? The internal analysis shows that it is rational to advocate citizen participation by reasons of legitimacy.

Det händer bara andra, det händer inte mig. Tre unga tjejers upplevelser av att ha levt i misshandelsförhållanden

Today several things point to the fact that many young women are being abused and sexual harassed. Despite that there is no knowledge about how the girls handle the violence or how the battering affects them. For that reason the purpose of this study is to describe and give a picture of some girl?s experiences of being battered of men they have or have had a relationship with. In focus is also how these girls identities are affected of the battering.

Aerodynamisk optimering av vindkraftverks rotorblad med en genetisk algoritm, BEM-teori, och XFOIL

This study presents a methodology that enables the annual average power of a wind turbine to be increased by automatically optimizing it?s airfoil, twist and chord dis- tribution. As a part of the study the software SiteOpt has been developed. This software connects the open source software XFOIL with the blade element momen- tum theory. XFOIL gives lift and drag coefficients which enable the blade element momentum theory to predict the power of a wind turbine at different wind and ro- tational speeds.

Back to the USSR : En studie av Rysslands demokratiska urholkning

Abstract:The purpose of this study is to examine what actually makes Russia an incomplete democracy, despite of all the formal democratic institutions and legal democratic rights.The research method used for this essay has been qualitative case study, which strives to answer two research questions: Which democratic principles are not respected in Russia? How does the executive power control the political arena? The theoretical framework used for this study consists of a model based on Dahls Polyarchy theory and the Rule of Law concept. The conclusions points out that very little have formally changed in Russia regarding democratic rights and the constitution. The democratic decline is due to political manoeuvres and undue political influence. There is no proper division of power and the executive powers are not controlled by a system of checks and balances.

Analys av designalternativ för snabbare dynamik i kolkraftverk med koldioxidavskiljning

Combustion of fossil fuels is today the dominating source of energy. During combustion,carbon dioxide is formed. The carbon dioxide accumulates in the atmosphere,which raises the global average temperature on earth through the so called greenhouseeffect. The only way to reduce the emissions of carbon dioxide from combustionin a coal fired power plant is through carbon capture and storage (CCS).Post-combustion capture is a technology to separate carbon dioxide from the uegas after the combustion for efficient transport and storage. The steady state operationof coal fired power plants with post combustion capture has already beenthoroughly investigated on a pilot scale, however much work remains to investigatethe plants dynamic operation.

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