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1901 Uppsatser om Rotating structure - Sida 6 av 127
Demonstrationsprojektets roll i framväxten av ny teknik: Fallstudier av två vindkraftprojekt
This report describes a synchronous machine model with magnetic saturation in d-axis, neutralconnection and electrical exciter interface for the transient simulator PSCAD/EMTDC. It hasbeen designed and verified in comparison to the regular machine model in EMTDC.The performance of the model is very good when incorporating a linear as well as a saturatedmagnetising inductance. The dynamic deviation is only thousandths to ten thousandths perunit. By using a cubic interpolation of the saturation curve, the model gives a good representationof the saturation effect. The open source code implementation of the synchronousmachine model gives the possibility to easily adapt the model to specific requirements.The derived model makes it possible to simulate a synchronous machine with its excitationsystems, e.g.
Om New Economy Firms strukturella utveckling längs med livscykeln och dess implikationer på organisationernas entreprenörskap - En fallstudie av tre svenska New Economy Firms
New Economy Firms (NEFs) are considered being important drivers of economic development and growth in Sweden. Also, entrepreneurship is a widely discussed topic that is considered being essential for firms that are making business in a fast moving landscape. Usually, the growth of companies is put in context of the life cycle. The life cycle further implies that as a company moves from the startup-stage along the curve, the organizational structure increases. Further, increased structure is claimed to impede the entrepreneurial culture within the firm.
Grönt perspektiv på planering! : ortsanalys med grönt perspektiv, exemplet Örkelljunga
Often, the green is handled as an opposite to the built, but if it could be seen as a part of the built and the society, the planning will be easier to handle. The thesis work wants to create a method that treats villages in an analytic way in a context; with green, blur, grey and all the other colors that together are the completeness.This master's thesis is made to be used as foundation in detail plannng in the municipality of Örkelljunga. Target audience is on one hand those who work with planning and green matters in Örkelljunga municipality, but also other planners who work with landscape.Literature in the field of green city planning has been studied and 30 methods for analysis have been valued. The method for analysis that has been used in this work is a merging of ten different methods and has included literature studies, sketches, interviews and work on spot. The ten methods are consciously chosen to together make one comprehensive and true image of the village, as far as it is possible.
Turbinkretspump system - Kraftvärmeverket i Borås
The Rya power plant in Borås produces district heating, district cooling and electricity. The plant is owned by Borås Energi och Miljö AB and is run by Dalkia Facility Management AB.In order to get the best heat exchange from the district hot water a pair of twin pumps and a turbine circuit pump are used as return pumps. Turbine circuit pumps are used to increase the pressure through the heat exchangers at the power plant. The pumps are in use when the flow is over 2 000 m3 h-1 and during the summer when re-cooling is used to improve the effectivens of the heat boilers.Since the pumps, that are parallel connected, rotating at a fixed rate per minute, the pressure is regulated with regulating valves. This report shows that during the 4,300 hours that the pumps where in use, energy corresponding to 590 MWh was wasted.
Hinder och möjligheter för att lindra smärta hos äldre personer - en empirisk studieObstacles and opportunities in dealing with pain management amongst older people - an empirical study
BACKGROUND: There is a high incidence of pain amongst older people. Several studies have shown that between 50 to 80 % of older people, who require domestic care or live in care homes, suffer from pain. Despite this many older people are under treated. AIM: The aim of this study was to explore what care providers perceive to be obstacles and opportunities of managing pain in older people. METHOD: A qualitative approach was used and the date was semi-structured interviews with open-ended questions.
Kapitalstruktur i små företag : En kvantitativ och en kvalitativ studie
Background: In the current labor and business policy debate in Sweden there is a major focus on the need for it to become easier to set up small firms, and that it needs to become easier for small firms to hire staff. In order to set up and run a business, funding is required. Firms can choose to work more or less actively with this issue, but they all need to relate to it. There are basically two ways to fund a business, either through equity or through debt. The ratio between these two sources is called the firm?s capital structure.Purpose: To chart the capital structure of small firms in Sweden.
Att återberätta glädje : En studie av struktur och språk i fem pojkars personligt återgivande texter
The aim of this study is to investigate how five boys in grade 3 of compulsory school structure and use language when they write narrative texts retelling and assessing personally experienced events. This is studied by interpreting how the boys use genre steps that are typical of the structure of personal narrative texts and by detecting and naming different linguistic features in the texts. The material in the study consists of five boys?personal reports and the method, which is based on the theories of genre pedagogy (see Johansson & Sandell Ring 2012:28ff, 223f), comes from systemic functional linguistics. A central finding of the study is that the boys structure their texts in varying combinations of genre steps which commonly occur in texts of a narrative kind.
Den optimala bloggen : En kvalitativ studie om bloggläsares attityder och idéer kring bloggdesign
The purpose of this study is to examine which aspects of blogs and blog design that are important to blog readers but also to find new ideas for blog design. From a qualitative standpoint we have examined how seven users experience that blogs design, structure and functionalities affects the general experience of the blog. The study also examines how the users wish to interact with a blog. During two design workshops we let seven active blog readers imagine and sketch out the design and functionalities they would like in a blog. We put this in relation to theories about the anatomy of blogs, methods of design, social navigation and virtual communities.The major finding is that the aspects most important to blog readers are navigation, structure and social interaction.
Vad tror blivande religionslärare? En livsberättelsestudie om sex lärarstudenters syn på religion
With this thesis I have examined the views of religion among six comparative religion teacherstudents, with the perspecitve of their life stories. I have also examined what stance they want to take due to their personal beliefs in their forthcoming teaching. To achive this I have used in-depth interviews among the six soon examined teacher students, and within the interviews I have had a particularly focus on turning points of the students? life stories. Later on I have used their turning points in an analysis with the hypothesis of ?Rites des Passage? and ?Structure and Anti-Structure?.In my survey I have found a significant relationship between the students? life stories - inparticularly their backgrounds and tourning points - and their views of religion.
Intranät : en kunskapskälla i arbetet?
The ambition with this study is to look into and create an understanding for how an intranet can work as a support system in work processes in capacity as a source of knowledge. We want to enhance the understanding for which kind of knowledge that can be coded in and transmitted by an intranet, and which that is lost in this process. We also want to clarify what it takes to get this knowledge, in collaboration with the intranet, to support the work in an organization. It is a qualitative case study at a Swedish bank. It consisted of semi standardized, half structured interviews with five people in one of the bank?s local offices.
"Att bygga broar över murar" : en studie av ett kvinnligt ekumeniskt nätverk
The purpose of this master`s thesis is to examine how the contemporary changes in society display itself in the network Ecumenical Forum of European Christian Women EFECW and to increase the understanding of networks. My main questions are: What does the networks structure look like? What does the networks relationships look like? How is identity created in the network and what types of identities is created? The objectives are reached by using two methods, qualitative inquiries and document analysis. The inquiries were carried out to nine members in the network of different countries. The theoretical framework of the thesis is Manuel Castells theories of the network society, and the study is also placed in context by a presentation of previous research on the field.
Modell av en synkronmaskin för PSCAD/EMTDC med magnetisk mättning i d-led och elektriskt gränssnitt för fältmatare
This report describes a synchronous machine model with magnetic saturation in d-axis, neutralconnection and electrical exciter interface for the transient simulator PSCAD/EMTDC. It hasbeen designed and verified in comparison to the regular machine model in EMTDC.The performance of the model is very good when incorporating a linear as well as a saturatedmagnetising inductance. The dynamic deviation is only thousandths to ten thousandths perunit. By using a cubic interpolation of the saturation curve, the model gives a good representationof the saturation effect. The open source code implementation of the synchronousmachine model gives the possibility to easily adapt the model to specific requirements.The derived model makes it possible to simulate a synchronous machine with its excitationsystems, e.g.
Mätning av dynamiskt tryck med piezoresistiva tryckgivare på roterande objekt
The report handles the transmission of signals from piezoresistive pressuresensors and thermocouple from a rotating object. This report also evaluates the possibility to collect data in a datalogger that rotates with the object. Telemetrics was previously used for signaltransmission in Finspång, therefore there has been no tests considering preassure measuring. One transmitting method handled in this report is transmission through a slipring connection. One test with a slipring connection was performed for transmitting signals from a piezoresistive preassuresensor.
ÖsterMälarstrand : en jämförelsestudie med Spacesyntax
The paper evaluates two housing proposals with Space syntax as method. The proposals are very different in a topological sense but are in a configural sense almost the same. This effect is because both proposals connect themselves to the existing configural structure of the city in the same way. Neither of them takes advantages of the most integrated streets in the existing structure and use them to concentrate pedestrian and car flows to the streets or points which are intended to be the most urban areas. The knowledge of Space syntax and this evaluation puts focus on the pour understanding among architects and planners of what effect urban design proposals will have..
Mätning av axiella magnetiska läckflöden i vattenkraftsgeneratorer
This thesis describes a method of measuring axial magnetic leakage flux in an operational hydropower generator. Axial magnetic leakage flux is the magnetic flux at the ends of a rotating generator, which goes through the stator parallel to the rotor axis. This flux can cause circulating currents in the stator iron, giving rise to losses, and can in the worst case overheat a generator, causing it to melt down. To measure the axial flux, and how it affects the generator temperature, a measurement system was constructed on behalf of Vattenfall. The system consists of search coil sensors and a signal-processing unit with amplifiers and active filtering. To confirm the behaviour of the axial leakage flux and the functionality of the measurement system, a test installation was made.