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  • 1101.
    Åberg, Hannes
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Riskpunkter för översvämning inom avrinningsområdet för Järvstabäcken vid extremregn: Modellering med MIKE FLOOD2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Gävle municipality's plans to exploit the city to the south are under the general plan for the areas Järvsta and Ersbo, these areas are dewatered to Järvsta stream. This thesis is an investigation of the Järvsta stream regarding flood risk areas within the basin with consideration to the planned development areas. Investigation of the catchment area has been carried out through field visits, literature studies and modeling with MIKE FLOOD.

    The problem with Järvsta stream is that it is already heavily loaded. With increased development areas for housing and commercial areas in Hemlingby and Järvsta expected Järvsta stream to be even more loaded in case of extreme rainfall. Ersbo industrial area is also expected to affect surface water flows, hence higher proportion paved surface in combination with the planned landfill for snow in the industrial area expect to impact the flow frequencies. The landfill for snow in Ersbo affects the flow frequencies during the melt period.

    Risk Points of flooding is found in low points and passages under E4, Södra Kungsvägen, Upplandsleden and Bomhusvägen. These points should delay stormwater to increase control over flows and reduce the risk of flooding and cost of restoration of the buildings and infrastructure. Risk points adjacent to the existing residential areas and planned residential areas should be prioritized for investigation.

  • 1102.
    Åhman, Matilda
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.
    Luftburen värme med ett centralaggregat i flerbostadshus2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The fact that the global warming is a major probelm in today´s society is no news and the climate change continues to take place at a very high rate. In order to create a sustainable society change requires where the potential is on energy efficiency and increased use of renewable energy. Energy efficiency can be changes in behavior, additional insulation of buildings or switching to more energy efficient installations. From a thermal comfort- and energyperspective today there are diffrent oppinions about airborne heat if it is a good heating system.

    This thesis is made for Ramböll, a consultant firm which focuse on technology and construction of society. The purpose of the study is to investigate whether a radiator system in an appartent buildning can be replaced by an airborne heating system with a central unit to get a more cost efficient system.

    This study is based on calculations for transmissions, airflow and directed operative temperature for the current building. Based on these data the ventilationsystem has been constructed and dimensioned. Also a proposal for the regulation of the indoor temperature for the system has been produced and also a economic comparison between the airborne heating system and the radiator heating system has been made.

    The resaults of the study shows that for the apartment building the airborne heating system is a cheaper alternative compared to the radiator system, based on prices of materials and work. The study shows that the thermal comfort with a airborne heating system is not affected in a bad way by the directed operative temparature in the occupied zone. Also larger ducts will be needed with airborne hating, which will require bigger and more space consuming shaft. The regulation of the indoor temperature is going to be with VAV-throttle in every appartmen, which means that the regulation can be done in each appartment but not in every single room. 

  • 1103.
    Åkesson, Ida Linnéa
    University of Gävle, Faculty of Engineering and Sustainable Development. University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Värmeförsörjning av ett framtida industriområde: En utredning och utformning av ett hållbart energisystem2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 1104.
    Åsander, Henrik
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.
    Tillvaratagande av värmeenergi ur gråvatten med värmepump i flerbostadshus2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Large amounts of energy leave homes with wastewater without any effort to return the heated water's thermal energy back to the building. With increased thermal envelope improvements of a traditional nature to meet the nearly zero-energy requirements for residential buildings that will come into effect by the end of 2020, energy losses in buildings can increasingly be allocated to the wastewater leaving the building.

    The aim of this work is to investigate whether significant energy savings in the mentioned area can be obtained, as well as to assess the economic opportunities and prospects for utilizing heat energy from grey water from multi-residential buildings connected to district heating networks with the help of a heat pump. And by that show which factors are shown to influence the operational savings and how sensitive the results are in relation to a selection of these factors. The work consists of and has been carried out in two parts: a literature study and a calculation study.

    Household wastewater can be divided into grey and black water. Grey water is the water that comes from bath, dishes and laundry and black water is the water that is flushed out of the toilets. Separated flows reveal the possibility of utilizing thermal energy directly from grey water, which is also the warmer, volume largest and more manageable fraction, both from a water purification and heat recovery standpoint. Studies on source separated systems show a wide range of benefits, largely by keeping household wastewater separated, such as increased resource efficiency of nitrogen and phosphorus at the wastewater treatment plants. The contamination of heat exchanger surfaces, especially biofilm, poses a challenge when wastewater is used as a heat source and is something that has to be taken into account even when using grey water as a heat source.

    The result of the calculations of an individual case with preheating of domestic hot water, given a series of assumptions, resulted in operational cost savings of approximately SEK 31,000 per year and a present value of these annual savings over 20 years of approximately SEK 355,000. Energy savings amounted to approximately 63,000 kWh per year, which means a reduction of the total need for purchased energy for domestic hot water production by 67 % with an assumption of a final domestic hot water temperature of 55 °C. The sensitivity analysis shows that crucial parameters in the calculation study such as electrical and district heating price, heat pump life and discount rate entail relatively large changes in profit if allowed to vary.

    It is obvious that there are large amounts of energy to potentially recycle. It is also obvious that difficulties cause grey water as a source of heat not be treated easily because, among other things, the long-term development of household water use and high pollution rates are factors that must be considered in addition to the factors brought up in the sensitivity analysis.

    District heating and heat pump combined imply a higher investment than a single heating system, but at the same time is something that can be seen as a tool for utilizing the assumed increasing energy price variations that an increasing proportion of intermittent renewable power generation implies simply by varying heating configuration with changes in energy prices and finding the optimal share. For a property owner, it would at this point be favorable to be able to choose what the cheapest option is currently.

  • 1105.
    Åström, Frida
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.
    Energieffektiviseringsanalys av ventilationssystemet för ett kraftvärmeverk: En fältstudie utförd i samarbete med Bomhus energi AB och ABB2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta arbeta kommer att utreda vilka det vanligaste energiförlusterna för ett kraftvärmeverk är, med fördjupning på förlusterna i deras ventilationssystem.  Kraftvärmeverket som har analyserats i detta arbete är Bomhus energi AB (BEAB) kraftvärmeverk och utredningen har skett i samråd med ABB Energy Efficiency team.    

    Världens energianvändning kan delas in i tre sektorer: industri, transport samt bostad- och servicesektorn. Industrisektorn kan sedan delas in i flera sektorer där massa och pappersindustrin står för majoriteten av energianvändningen i Sverige. Industrisektorn står för ca 64% utav världens el-energiförbrukning. Detta gör att det finns stort intresse i att se över de komponenter som har hög elförbrukning.     

    Fokuset har i detta arbete varit på ventilationssystemet och dess fläktrift. För att få information om vart det kan finnas komponenter som brukar mycket el så har styrsystemets loggar setts över. Besparingspotential har då identifierats i att installera frekvensomriktare till aggregatens fläktar istället för att använda den befintliga spjällregleringen. ABB har tidigare funnit besparingspotential i pumpdrifter för kraftvärmeverk och är därför nu intresserade av att se om det finns någon besparingspotential i ventilationssystemet.

    BEABs ventilation är uppdelad på process och allmänventilation, och genomlysning utav ventilationssystemet är i detta arbete begränsat till allmänventilationen i pannhuset. Detta då processventilationen anses vara korrekt dimensionerat.

    För att få insikt i hur energieffektivisering utav ventilationssystem kan gå tillväga har olika vetenskapliga artiklar rörande ämnet valts ut och analyserats. Som systemet är uppbyggt så sker regleringen utav ventilationen med spjällreglering. Spjällreglering innebär att fläktarna går på konstant flöde och för att uppnå önskad temperatur och tryck i byggnaden så sitter det tryckreglerande spjäll på taket som släpper ut luft ur byggnaden. Denna typ av styrning är inte särskilt energieffektiv, vilket har motiverat detta arbete till att rikta in sig på frekvensomriktare till aggregaten och hur mycket energi som då skulle kunna sparas.  För att få fram besparingspotentialen har hänsyn tagits till aggregatens: nominella volymflöde, fläktverkningsgrad, transmissionsverkningsgrad, flödesreglering, motoreffekt, motorns verkningsgradsklass, matningsspänning, fläkttyp, pumphjulstyp, varaktighetskurva, årgångstid, energipris samt multiplikatorn för Co2-utsläpp. Data har sedan matats in i ABB Energy Save kalkylatorn som då har tagit fram hur mycket energi och pengar som skulle kunna sparas genom att installera en frekvensomriktare.  Om de frekvensomriktare som då har tagits fram för de olika aggregaten skulle installeras så skulle uppskattningsvis ca 67 000 kr/år kunna sparas för kraftvärmeverket. 

  • 1106.
    Ögren, Malin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Cykla i stadsmiljö: “Vinsten för individen av att cykla”2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Gävle municipality has a goal to increase cycling in Gävle. In the year 2025, the proportion of journeys less than four kilometers should be at 60%, a survey from 2012 showed that the proportion were only 24% (Atterbrand et al, 2012). According to the same survey, it was found that the municipality of Gävle will not achieve their goals about the proportion of short trips undertaken by bicycle since the number has not increased since 2006 (Indebetou et al, 2012).

    The essay aims to develop a concept that will encourage more people to choose the bicycle over other means of transport. The main goal is to find out how the interest in cycling in urban environments can be increased.

    The work has been limited to focusing to a local level, but the idea is that the results can be used to create similar products to all urban environments.

    Methods that have been used to get to the final result are interviews with individuals and with people working for the municipality of Gävle. The work also include a study of different scientific articles, an analysis to decide functions of the resulting concept and market research to determent what would be necessary to the results.

    For the research, official material from municipality of Gävle is used, as well as scientific articles and interviews. The facts are used to confirm reasons why people should choose to bike over other modes of transport as well as to show that Gävle has potential as a cycling city.

    The facts that are mentioned in the research are later on used to make different design proposals. Based on the interviews made, three bigger needs are presented as a way to select a design proposal to develop further. The result is presented at the end in the form of an app to smartphones.

    The appearance and features for the app that has been produced occurred after making a market research where two apps for smartphones were investigated, and also a feature to cyclists who the municipality of Gävle offers via their website to offer a custom wayfinding just for cyclists. The apps that were investigated is called RunKeeper and Google Maps. RunKeeper is a motivational app to increase interest in the exercise. Google Maps is an app that uses GPS to give directions for motorists, cyclists and pedestrians.

    The market investigation provided the basis for the final app dubbed Cyclum. Cyculm give tips on places to bike to show bike lanes in the city and can offer the cyclist wayfinding between two points that the user specifies. By using Cyclum cyclist can collect statistics about their bicycle use, a way to motivate to bike more.

  • 1107.
    Öhman, Rasmus
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Energikartläggning av lokaler och processer i hyresfastigheten Sörby Urfjäll 37:32013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna uppsatts är att utreda energianvändningen i fastigheten Sörby Urfjäll 37:3 och samman ställa en energibalans.

    Mätningar gjordes på elanvändning, av temperaturer i ventilationskanaler och temperatur loggning gjordes i fastigheten. Under platsbesöken undersöktes användningen av maskiner, antalet människor som vistas i de olika delarna av fastigheten samt att maskiner, kylskåp, datorer och lampor räknades och eleffekten på dessa registrerades.

    Utifrån mätningar, statistik och observationer beräknades temperaturverkningsgrader ut på ventilationssystemen, värmetillskott och värmeförluster beräknades. Med utgångspunkt i beräkningar och statistik sammanställdes en energibalans.

    Åtgärder har utifrån de resultat som uppkom under arbetets gång för att effektivisera fastighetens energianvändning tagits fram. Åtgärdernas kostnader och hur invecklade de är varierar från att täta springor och rengöra fönster till att byta ut stora ventilationssystem.

  • 1108.
    Öholm, Frida
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Utredning av snödeponi med konstruerad våtmark: Undersökning av nya indikatorer och rutiner till kontrollprogram för Gävle kommun2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The study deals with the disposal of snow inGavle, and with systems for handling the masses of snow. The disposal of snow may fall within the classification of environmentally hazardous activities. One reason for this classification is the snow's ability to accumulate contaminants. The purpose of the study is that based on the high-profileproblem areas at the facilityfor snowprovide a basis for possible areas of improvement for the existing framework for the management of the facility.Since the facilityin this study has been deemed environmentally hazardous activities are a number of requirements that the facility should not constitute a nuisance to humans and the environment. Requirements include procedures for a structured approach to self-regulation. In this case there is an established inspection program to perform thecontrols. The monitoring program has contributed to insecurity in the municipality, when it has not been considered include facilityfor snowsactivity. With the examination of the existing control program has been considered in this study to be the most compatible with facilityfor snow. However, there are procedures in the control program should be reviewed and adjusted or even removed from the program.Therefore, a further investigation on what points in the program can be eliminated.Based on previously conducted water sampling, carried out by authorized consultants, and hasanalyzed the results compiled. There, among other things, revealed shortcomings with sampling designs. They have not been conducted according to the established inspection program and at times has been sampling absent entirely. Despite this, no higher concentrations of pollutants found for the melt water in comparison with the general guidelines. Therefore, routine surface water sampling questioned, it generally needs to be performed according to the prescribed in the control program.New indicators for the analysis of surface water havebeen produced as suggestions for future sampling. They have been implemented by investigating which substances have been found in highest concentration in the compilation of the sampling results, in which the metals copper, zinc and lead are the most abundant. Since these substances, together with suspended substances were found to be most detectable, these substances can be important indicators continue to evaluate. Survey has also been carried out on the basis of guidelines and standard levels for surface water, and it resulted in indicators chromium, nickel, phosphorus, nitrogen and PAHs were added.These substances not examined in the current situation, therefore, there may be a need to perform a comprehensive sampling. It can be implemented to determine which substances may be present in addition to what is already checked during sampling.

  • 1109.
    Öhrn, Tobias
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Quartzene i betong: Hur påverkas hållfastheten?2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete undersöker hur Quartzene® som tillsatsmaterial påverkar hållfastheten hos betong. Arbetet sker i samarbete med företaget Svenska Aerogel AB som också äger patent på Quartzene®. Ämnet har vissa likheter med andra tillsatsmaterial som används i Sverige. Quartzene® har dock ett kartlagt innehåll vilket är en fördel jämfört med de andra tillsatsmaterialen som måste analyseras innan användning.

    Syftet är att prova hur Quartzene® i olika doser och diverse sammansättningar påverkar hållfastheten hos betong. Litteraturstudier har legat till grund för de praktiska provningarna och analyserna av givna resultat. Arbetet gjordes i ett byggtekniskt laboratorium med utrustning för böjdrag- och tryckhållfasthetstester, våg, elektriskt skjutmått mm. Prover gjordes på 7 och 28 dygn gamla betongprismor. Resultatet som presenteras och analyseras i rapporten visar på att Quartzene® förändrar hållfastheten. Att byta ut en del av cementen mot Quartzene® har ingen positiv inverkan på varken 7 dygn eller 28 dygnshållfastheten. Oklart hur det skulle se ut efter längre tid t ex ett år.

    Quartzene® blandades i som pasta i vissa betongrecept och som pulver i andra.

    Konsistensen på betongen blev torrare när Quartzene®pasta blandades i. Trots att pastan innehåller 85 % vatten blev alltså blandningen fast. Den blev dessutom än mer fast efter bara några minuter eftersom pastan stelnar av sig själv. Vattnet i pastan tycktes inte vilja bidra med lägre viskositet. När Quartzene® i pulverform blandades i, blev betongmassan däremot mycket lätt att arbeta med. Det går att dra slutsatser att Quartzene® i pulverform är bättre för hållfastheten än vad Quartzene®pasta är. Den ger ungefär 5 MPa högre tryckhållfasthet. Om 5 MPa skulle adderas till resultaten för betongen som blandades med Quartzene®pasta skulle den ge högre hållfasthet än den som betong var utan Quartzene®.

    I de recepten med mycket Quartzene® var det en mer positiv utveckling mellan 7 och 28 dygn. Därför hade varit mycket intressant att se hur det skulle ha sett ut efter 90 och 365 dagar.

  • 1110.
    ölander, kristian
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Industrial design.
    Produktutveckling för catch and release fiske: Ett redskap som underlättar landning av fisk2018Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • 1111.
    Östberg, Evelina
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Krummeltåget: ett designprojekt om hur man kan arbeta praktiskt med genus i förskolan2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Redan i förskoleåldern lär sig barn att anpassa sitt beteende till de könsroller som de blivit tilldelade av samhället. Enligt Anette Hellman (Kan Batman vara rosa? Förhandlingar om pojkighet och normalitet på en förskola, 2010) finns det tydligt mönster för hur barn agerar och förväntas agera. Jällhage och Dilen (2013) rapporterar om att attityder hos ungdomar kan förändras vid ett aktivt genusarbete i skolan där elever tränas i att tänka normkritiskt. Om detta arbete introduceras redan i förskoleåldern finns möjlighet att attityder till normer kan förändras och att framtida samhällsmedborgare kan komma att ha större tolerans och acceptans för det normavvikande.

    En viktig aspekt för att få ett tolerant samhällsklimat är att barn möts med intresse och respekt. De bör uppmärksammas för sin person och känna sig trygga i de identiteter de skapar sig/finner. Det kan ibland krävas hjälp från vuxna till barnen med att tänka normkritiskt, detta arbete undersöker hur man kan gå till väga för att ge barn stöttning i sina funderingar kring livet.

    Detta projekt har lett till ett metodmaterial med tillhörande interaktiv aktivitetsmatta där barn får möjlighet att utforska, fundera och diskutera utifrån sin syn på världen. Aktivitetsmattan med handledning riktar sig till barn övre förskoleåldern och deras pedagoger.

  • 1112.
    Östblom, John
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Utredning av Valboåsens grundvattenmagasins förbindelse med Gavleån: En analys av halten löst syre genom mätningar2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Gävle municipality's water company is Gästrike Vatten AB. They manages the drinking water production for the City of Gävle. The production starts in the ridge of Valbo which extends between Överhärde (located in the south part of Valbo) and Strömsbro (located in the north part of Gavle). Purpose of this report is to measure the dissolved oxygen content in the aquifer throughout the whole area to investigate where the infiltration from the nearby Gavle River occurs. The aim of the study is to get a better understanding of the complexity of the Valbo ridge. The measurements will help to verify or modify the conceptual model of the directions of water flow in the Valbo ridge, developed by Midvatten AB. Dissolved oxygen content was measured through ground water pipes. To assess the pipes’ capacity and connection to the aquifer, slug tests were performed. The dissolved oxygen data were analyzed and compared with the conceptual model. The results showed that the dissolved oxygen content in the water supported the conceptual model to a large extent and also gave previously unknown information on some stretches of the ridge. The method shows great potential for additional future studies in Valbo ridge and elsewhere. To expand the study further, a need for more sampling of the aquifer throughout the areas that were not included in this study.

  • 1113.
    Östlund, Christoffer
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Framkomlighet i entréer på Högskolan i Gävle för personer med nedsatt rörelseförmåga2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    It is claimed that the modern society is built for everyone, yet many individuals with disabilities encounter problems in their everyday life that prevent them from feeling like a part of society. University of Gävle has been proven to have insufficiencies regarding availability. This has been exposed in surveys conducted by students in the Building Engineering Program.

    This thesis aims to identify the problems that exist at the ramps and entrances. To facilitate the investigation, the major entrances to the school were selected.

    The theoretical material consists of BBR 2014, Bygg ikapp 2014 and websites with related content. To find scientific articles websites such as Taylor & Francis Online, Academic Search Elite and Web of Science was used. These articles were discovered in the database in the library of The University of Gävle and the searches related to relevant literature that revolves around disabilities and accessibility in buildings.

    The study is based on two labs that has been named lab one and two. In lab one, the entrances were measured and this data was compared with previously established literature-data that describes what is acceptable when you are using a wheelchair. This data consists of measurements but also an inspection of existing resources. Lab two consisted of a practical test with a wheelchair and was based on an existing template used in checking accessibility. The purpose of the second test was to experience the problems firsthand and undergo these tests as a real-life experience.

    The results from both labs were very poor and many entrances showed major flaws at most checkpoints.

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