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3983 Uppsatser om Electrical distribution systems - Sida 49 av 266
Regional Styrningsproblematik i ett Utvidgat Europa - en komparativ fallstudie av Frankrike och Polen
The aim of this comparative study is to analyse the French and the Polish regional governance in order to see if there are any differences in their regional ruling systems. Further more I will study their different possibilities in taking part in the European Union regional political market. The shape of the regional systems will be explored both organisationally (study of the institutional entities of the regional construction) and functionally (study of the competencies of the regional body etcetera) to focus on its cause on the regional development. My over all focus will be to find out whether regional rule means differently in the countries France and Poland.Several questions are dealt with and the two main ones are as follows; How do the different structures of the form of government in France and Poland influence the governance on the regional level? Do Poland, as a new member state of the European Union, have what it takes to face the challenges of the new membership; or are there a complex of problems arising from the admittance that prevent its regions from fully taking part in the European regional political market?Some of my conclusions are as follows;There are major differences between the two countries when it comes to their regional ruling systems leading to different abilities in taking part in the European regional political market.
Trafikverkets effektstyrningssystem - EFS 132 kV : Bidraget till minskade förluster
The technological legacy from the early electrification of the Swedish railroads has resulted in a power grid with a lower grid frequency than the national power grid from which it is fed. Energy transfer between these power grids with different frequencies requires substations, adapting the grid frequency for the rail road power grid. For this purpose, a feeding power grid has been built, stretching across the country from Boden in the north to Tälle/Häggvik in the south.Power transfer in the Swedish power grid results in voltage angle differences which increase with increasing loads and transfer distance. These voltage angle differences are transferred from the power feeding substations to the rail road power grid, will in some extent cause loss of energy due to unwanted power flows from north to south.To minimize the losses due to this phenomenon, a power management system called EFS 132 kV has been developed and implemented. The system minimizes the unwanted power flows and controls the desired power flow for a good distribution of loads between the power feeding substations.This thesis investigates the extent of the transmission losses avoided due to the EFS 132 kV that coordinates the idling angles to a common reference point.The results indicate that EFS 132 kV affects the power flow, especially between the northern substations through an improved load distribution.
Förstudie för en vindkraftpark på Malmölandet i Norrköping : En undersökning av förutsättningarna för en vindkraftpark på ett sen tidigare planerat område
This is a feasibility study that examines various aspects of building a wind farm on Malmön in Norrköping. The feasibility study deals with interests of conflict, park design, electrical connections, production calculation, financial calculations and operating- and timetable.The report is divided into two distinct parts. First a theoretical part, which deals with conflicting interests, park design and electrical connections. Second a part with simulations dealing with production calculations, and financial calculations.Opposing interests are mapped so that problem areas can be found, and help put focus on the right places at a future environmental impact assessment (EIA). There are a number of areas where planners have to assess on an EIA, this thesis point on the most important areas.
En pilotstudie av unghästars användning av ligghall i grupphållningssystem
Today, individual indoor stalls and individual outdoor paddocks are the most common way to house horses in Sweden. The way that we manage, house and feed the horses are not optimal for the species natural basic behavioural needs. However, the awareness of this grows in the context of research and the emergence of alternative housing systems. One of the alternatives to the traditional format in individual boxes is called group housing. Group housing systems allow horses to live in herds and they can choose how they want to distribute the hours of the day between movement, resting and foraging.
The purpose of this study is to examine how frequently the young horses in a group housing system use the indoor lying area.
Boktryckaren på Visingsö: en granskning av Sven Almqvists forskning om Johann Kankel
The aim of this thesis is to examine Sven Almqvist?s research on the 17th century book printer Johann Kankel who was employed by count Per Brahe the younger on the island of Visingsö. A model to describe the communications circuit, constructed by book historians Thomas R. Adams and Nicolas Barker are used as well as the historical source criticism method. This model consists of the five phases: publication, manufacture, distribution, reception and survival.
Nationella proven i matematik? en tillgång för läraren? : Hur några lärare använder sig av resultaten på de nationella proven i matematik
The purpose of this qualitative study is to investigate how some teachers make use of the results of the national tests in mathematics to plan their teaching. The questions are how they plan their teaching in mathematics and if they use the results of the national tests to compare with their own teaching. Five teachers in mathematics has been interviewed. I have used unstructured interviews with open-ended questions, and I have been able to ask follow-up questions based on their answers. The analysis of the survey is made from a systems theory approach. The result of the survey shows that teachers make use of student performance to look at their own teaching of the current group of students. However, there is not enough time to rehearse and repair the deficiencies discovered in the national tests, which for some is perceived as a stress factor.
Aktiv bullerdämpning i ventilationssystem
Active headsets have been on the market for years and now it is time for
something else to enter the stage. The technology of active noise reduction can
for exmple also be used in ventilation systems for reducing ventilation noise.
An active control system principally consists of four important components,
namely the downstream error microphone, the upstream detection or reference
microphone, the digital signal processor (DSP) and a loudspeaker.
The upstream reference microphone listen to the primary ventilation noise and
sends it to the DSP which makes a phase shift to the signal and sends it to the
loudspeaker. The loudspeaker sends out the opposite waveform of the incoming
one and reduce the primary ventilation noise.
Kvinnliga yrkesmässiga nätverks betydelse för ledarskapet och karriären
In today?s society there is an ongoing debate concerning gender distribution amongst the top executives and there is a clear distinction between the men and women in leading positions. The reason for this can be because men and women to a certain degree conduct leadership differently. It is said that men are more focused on task oriented leadership while women seem to focus on a relation oriented and more interactive leadership. A leader?s success could be due to his or her ability to set up and use a network.
Sustainable Construction in the Transportation Infrastructure Industry? as a vision and in practice
This study has been conducted on behalf of Vectura Consulting AB with the purpose to examine how different actors perceive the dimensions of sustainability and sustainable construction. The purpose is also to provide an understanding of existing barriers and opportunities for sustainable construction within the industry and exemplify with different directions for the actors in order to develop sustainability. The study has approach the research problem by using systems theory, developed by Checkland, to identify the relevant system. Other systems theories has been used as an theoretical framework in order to identify barriers and opportunities, which in this study are based on Hughes?s theory about reverse salients and salients.
Canine S- and M/L- cone electroretinograms
Full-field flash electroretinography is an electrodiagnostic method used to examine the function of retinal cells. Light stimulation of the eye elicits electrical potentials in the retina. By aid of a corneal electrode and a reference electrode close to the back of the eye, the electrical potentials can be recorded and presented as an electroretinogram (ERG). ERGs driven by mainly one type of cones can be used to examine the function of a single cone class. In human beings, studies have shown the cone class sensitive to light of short wavelengths, the S-cones, to be more vulnerable to acquired damage than the other cone classes (Daley et al., 1987; Gouras et al., 1993; Greenstein et al., 1989).
Dogs have two cone classes, S-cones, and M/L-cones (most sensitive to medium to long wavelengths).
Biomass losses during short-term storage of bark and recovered wood
Storage of biomass is associated with problems like heat development, biomasslosses, and reduction of the fuel quality. Certain processes such as biological- andchemical degradation are responsible for these storage problems. This master?sthesis was carried out at Vattenfall Research and Development AB and is alignedtowards quantifying the biomass losses from short-term storage (1-2 months) ofbark and recovered wood. The biomass was stored in outdoor piles during differentseasons, campaign 1 (summer) and campaign 2 (autumn).
Analys av fiskerättsförhållandena i Stockholms skärgård i relation till känsliga områden samt fysisk störning
This work is a GIS study of fishing rights distribution between different categories of ownersand properties in the Stockholm Archipelago. The purpose was to create basic data used toestablish fishing laws and restrictions within the Stockholm County.Stockholm?s archipelago consists of a unique environment and is the natural life andreproduction environment for ? of Sweden?s reproducing fish species. The increasingpressure from fishing, tourism and weekend population increases the need for an efficientfishing administration to prevent impoverishment and to ensure the biological diversity inSwedish fishing waters. There is an increasing need to review fishing administrationmethodologies, as well as studying the categories of ownership and properties located insensitive areas and areas influenced by physical disturbances in order to establish effectivelaws and restrictions.The Swedish fishing rights for an area are currently not connected to the ownership of theproperty to which it belongs.
Mekaniskt brandsläckningssystem
Electrolux Laundry Systems is the world leader in manufacturing professional laundry equipment.The machines are used in the hotel sector, elderly care, in multifamily houses, laundry bars, and incommercial and institutional laundries.If there is oil or grease left in the clothes after washing may the heat from the dryer cause a chemicalreaction. This reaction may, under certain circumstances cause a fire inside the drum. Competitors toElectrolux has developed its own systems that extinguishes fire inside a tumble dryer and customershave expressed desire to purchase a fire-extinguishing system. Therefore, the project team receivedthe task by Electrolux to develop a fire-extinguishing system that extinguishes a fire in a tumbledryer.The purpose of the project has been to develop a system that both detects and responds to fire in anindustrial tumble dryer to meet the competitors and to satisfy customers' requirements.The goal was to develop a fire-extinguishing system for Electrolux Laundry Systems and develop afully functioning prototype.The project began with information searches on a variety of methods to both detect and extinguish afire. Subsequently, a number of different methods were used to develop a final solution and make aprototype.The result of the project is a fire-extinguishing system that extinguishes a fire inside a dryer.
Distribution och ruttplanering vid Åbro Bryggeri : en fallstudie som undersöker manuell kontra datoriserad ruttplanering
I denna magisteruppsats har författarna valt att studera Åbro Bryggeri AB: s distribution och belysa skillnader mellan olika metoder att planera transporterna på. Valet av ämne är intressant för oss som logistikstudenter, transporter och varudistribution är ett område som liksom övrig logistik är under ständig förändring.SyfteSyftet med denna uppsats är att analysera och utvärdera Åbro Bryggeri AB: s manuella metod för ruttplanering som används idag, och sedan jämföra detta mot effekterna av ett datoriseratruttplaneringsprogram. Uppgiften är avgränsad till att undersöka uppläggning och planering av rutter från Åbro Bryggeri AB:s terminal i Årsta, Stockholm.Undersökningen har gjorts genom en fallstudie som innefattar både kvalitativa och kvantitativa metoder. Kvalitativ forskning har använts för att beskriva exempelvis distributionssystemet vid Åbro Bryggeri. Kvantitativ forskning har använts där stora mängderdata samlats in, exempel på detta är jämförelsen mellan dagens ruttplaneringssystem vid Åbro och simulerade lösningar i ett datoriserat ruttplaneringsprogram.
Distributionsstrategier som konkurrensmedel
Stora som små företag kan idag vara med och konkurrera om kunder på den globala marknaden. För att överbrygga den geografiska problematiken med stora avstånd mellan kunder och aktörer inom värdekedjan, har dagens utvecklade transporter och tillika transportnät haft en enorm betydelse. Produkter kan idag med relativt små ekonomiska medel förflyttas för att skapa ett större ekonomiskt värde på ett långt avstånd ifrån det säljande företaget.Olika produkter har dock olika krav beträffande leveransservice och leveranssäkerhet. Många produkter kan transporteras och distribueras under en längre tid och för en lägre kostnad, medan andra kräver att transport och förflyttning löses omedelbart. De långa avstånden på den globala marknaden gör det extra svårt för företag vilka säljer och distribuerar tidskänsliga produkter, men även för exempelvis produkter utvecklade för akut vårdassistans.