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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Sammanställning av utbildningsmaterial om reservkraft med inriktning dieselaggregat / Compilation of education material regarding back-up power with focus on diesel power generators

Andersson, Martin, Hägerström, Martin January 2015 (has links)
Dagens samhälle är uppbyggt av ett konstant energiberoende för att få samhällets alla funktioner att fungera. Ett strömavbrott kan därför bli förödande där kontinuerlig tillgång till elektricitet behövs, trots att Sverige har starka elnät har kravet att alltid ha tillgång till elektricitet öppnat upp en marknad för reservkraft. Syftet med det här arbetet var att ta fram kursmaterial för att läsaren ska få en övergripande kunskap om reservkraft med inriktning på dieselkraft. Det framtagna kursmaterialet består av rekommendationer i form av sidhänvisningar ur källor som kan användas vid sammanställning av undervisningsmaterial. Kompendiematerialet kompletteras med en PowerPoint-struktur som kan användas i undervisningssyfte. Genom att studera relevanta källor har vi fördjupat oss i ämnet dieselaggregat och har plockat ut sidhänvisningar enligt kopieringsavtalet, som gäller för högskolan, som vi anser passa bra vid skapandet av ett kompendium. Vi har även strukturerat en grund till en PowerPoint som kan underlätta vid skapandet av föreläsningsmaterial.Denna rapport förklarar ett dieselaggregats tekniska uppbyggnad och vad som är viktigt att tänka på vid dimensionering av ett aggregat. Rapporten tar även upp rekommenderat underhåll samt de miljö- och säkerhetskrav som ställs på att aggregat. / Today's society is composed of a constant energy dependency to get all functions of the modern society to function, a power failure can be devastating. Even though Sweden has a strong power grid, the requirement to always have access to electricity has opened up a market for back-up power. The aim of this work was to create material that could be used in educational purpose and for the reader to get a basic understanding of back-up power with focus on diesel generated power. The course material consists of recommendation of content in the form of page references from sources that fit well in the compilation ofeducation material in the form of a compendium. The compendium is supplemented with a layout of a PowerPoint presentation that can be used for educational purposes. By studying the relevant sources, we have deepened in our topic diesel generated power and have picked out page references, in accordance with the agreement regarding the school copy law, which we consider to be a good fit for the creation of a compendium. We have also created a foundation to a PowerPoint that can facilitate the creation of lecture material. This report explains the structure of a diesel power generator and what is important to consider when sizing a power system. The report also discusses recommended maintenance as well as the requirements placed on a diesel power generator.
2

Dinaminis kompiuterinių sistemų infrastruktūros atnaujinimo modelis, pagrįstas atviro kodo sprendimais / Dynamic update model of computer systems infrastructure based on open source solutions

Pachomov, Artiom 17 July 2014 (has links)
Šiame darbe analizuojamos įmonės su užsistovėjusia bei pasenusia programine įranga dinaminis atnaujinimas utilizuojant naujos atviro kodo nemokamos įrangos galimybes. Formuojamas dinaminis modelis, kuriame pritaikomi nepertraukiamų paslaugų, vartotojų centralizuoto valdymo bei neprarandamų duomenų sprendimai. Taip pat pateikiama analizė, kaip atlikti paslaugų įrangos migravimą bei sukurti pagalbinę IT infrastruktūros dalį, optimizuojančia sistemų priežiūrą bei našumą. / This paper analyzes, dynamic systems software updates for institution with deprecated system infrastructure using free, open source based solutions using most of it possibilities. Dynamic model is formed, which includes identity management, high availability clustering, data replication and data integrity solutions. Also additional analysis is included for IT infrastructure usage optimization.
3

Power electronics solutions for uninterrupted power supply and grid-tie inverters

Nezamuddin, Omar N. 21 November 2014 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / This thesis proposes two new topologies for Uninterrupted Power Supply (UPS), and a grid-tie microinverter. The first topic will discuss an on-line transformerless UPS system based on the integrated power electronics converters that is able to control the input power factor, charge the battery, and guarantee backup operation of the system. The main advantages of the proposed UPS are active power factor correction (PFC) without the need of a complex control scheme, and integrated functions of the battery charger circuit and PFC with only three power switches. Operation modes of the system and the PWM strategy is presented in detail. The second topic discussed is of a proposed circuitry for a single-phase back-to-back converter for UPS applications. The main advantages of this topology is higher number of levels at the rectifier side, less number of power switches, and no need for a boost inductor at the input side of the converter. The last topic discussed is of a proposed patent pending microinverter. This topic was a project funded by the National Science Foundation, and its aim was to help commercialize the research. This project proposes a solution for a solar inverter called Delta Microinverter that allows easier and faster installation as well as power conversion with higher efficiency. Delta Microinverters innovation is found in its patent-pending shape and in its patent-pending circuitry, i.e., electronics mounted inside of the Delta Microinverter. The Delta Microinverters shape has a housing configured for rapid mounting using a single fastener and its power electronics configuration offers an optimized relationship between the number of levels and number of power switches.
4

Formella nätverk som verktyg vid jämställdhetsintegrering : En studie av nyttan med formellt nätverk som verktyg i arbetet med jämställdhetsintegrering i en svensk myndighet / Formal network as tools for gender mainstreaming : A study of the usefulness of women’s network as a tool in the work on gender mainstreaming in a Swedish authority

Emanuelsson, Karin, Päivinen, Jennikka January 2019 (has links)
Bakgrund och problem: Genom flera studier har det framkommit att ovälkomna handlingar är en utbredd problematik inom den svenska Försvarsmakten. Kvinnorna har fortfarande inte en självklar plats på alla befattningar trots att Försvarsmaktens könsbundna yrkesmonopol slutade år 1989. Det formella nätverket Nätverk Officer/Anställd Kvinna (NOAK) infördes av Försvarsmakten för att hantera frågor kring ovälkomna handlingar, för att fungera som stöd och forum där kvinnor kan diskutera problem samt utbyta erfarenheter. Metod och syfte: Denna studie skall beskriva och undersöka hur ett formellt nätverk kan vara gynnsamt eller missgynnsamt som verktyg i arbetet med jämställdhetsintegrering inom en myndighet. Även medarbetarnas upplevelser av nätverket som verktyg kommer att studeras. Vidare ämnar studien till att identifiera eventuella bakomliggande faktorer till medarbetarnas upplevelser av verktyget formellt nätverk genom de sociala normer som påverkar varje individ. Detta för att beskriva och undersöka om formella nätverk är ett verktyg som fungerar vid jämställdhetsintegrering och hur detta då bör vidareutveckling och förbättras. Studiens resultat och slutsatser har baserats på semistrukturerade djupintervjuer med anställda på ett regemente, litteraturöversikt av tidigare forskning och interna dokument från Försvarsmakten. Resultat och slutsats: Under intervjuerna framkom att nätverk likt NOAK kan vara bra om det utformas på ett sätt som har ett förståeligt syfte för medarbetarna inom organisationen. I dagsläget saknas förståelse och kunskap om nätverket och dess syfte. Respondenterna uppgav nätverk som något positivt trots att de inte förstod varför de skulle delta på NOAK-mötena (Nätverk Officer/Anställd Kvinna). Bakomliggande faktorerna är främst okunskap kring jämställdhet, syfte och oviljan att delta i ett ”gnällforum”. / Background and problems: Through several studies it has emerged that unwelcome actions are a widespread problem within the Swedish Armed Forces. The women still do not have a clear place on all positions even though the Swedish Defense Monopoly's was closed in 1989. The formal network Network Officer/Employee Woman (NOAK) was introduced by the Swedish Armed Forces to handle issues concerning unwelcome actions, to serve as support and forums where women can discuss problems and exchange experiences. Method and purpose: This study aims to investigate how formal network can be beneficial or disadvantageous as a tool in the work of gender mainstreaming within an authority. The employees' experiences of the network as a tool will also be studied. Furthermore, the goal is to identify any underlying factors for the employees' experiences of the tool formal network through the social norms that affect everyone. This for research on formal networks is a tool that works in gender mainstreaming and how this should be further developed and improved. The study's results and conclusions have been based on semi-structured deep interviews with employees, literature review of previous research and internal documents from the Armed Forces. Results and conclusion: During the interviews it emerged that networks like NOAK can be good if it is designed in a way that has an understandable purpose for employees within the organization. In the current situation, there is no understanding and knowledge of the network and its purpose. The respondents stated that networks were something positive, even though they did not understand why they would participate in the NOAK meetings(Network Officer/Employee Woman). The underlying factors are primarily lack of knowledge of gender equality, purpose and unwillingness to participate in a "whining forum".
5

Záložní zdroj / Uninterruptible Power Supply

Mrázek, Petr January 2019 (has links)
The thesis deals with Uninterruptible Power Supply (UPS) and associated problems of backup power in case of unexpected outages of electricity. Start of work is dedicated to limitation of the electricity supplies, as well as their causes and consequences. Furthermore, brief history of UPS and subsequently distinguish between UPS’s architectures. There is also a description of the energy sources such as batteries, flywheels or fuel cells. Part of thesis describes security of electricity supply in health care facilities, including requirements for emergency power. The own design of UPS is described in the end.
6

Záložní zdroj (UPS) / Uninterruptible Power Supply

Mrázek, Petr January 2015 (has links)
The thesis deals with Uninterruptible Power Supply (UPS) and associated problems of backup power in case of unexpected outages of electricity. Start of work is dedicated to limitation of the electricity supplies, as well as their causes and consequences. Furthermore, brief history of UPS and subsequently distinguish between UPS’s architectures. There is also a description of the energy sources such as batteries, flywheels or fuel cells. Part of thesis describes security of electricity supply in health care facilities, including requirements for emergency power. The own design of UPS is described in the end.

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