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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

Tor och den nordiska åskan : föreställningar kring världsaxeln /

Bertell, Maths, January 2003 (has links)
Avhandling--Stockholm, 2003. / Bibliogr. p. 278-[292]. Résumé en anglais.
2

Energieffektivisering av Åhlénshuset i Umeå : Utredning av åtgärder för ventilation, värme och kyla / Åhléns house in Umeå : Investigation of measures for ventilation, heating and cooling

Johansson, Petter January 2013 (has links)
Sweden is a country that has made some progress in developing energy efficient solutions. The problem in Sweden is that many houses and apartment buildings are old and have inefficient ventilation- and heating systems. This energy is lost when systems are inefficient, which then results in huge economic costs. Luckily, more and more people are becoming aware of this, which means that Sweden is on track to become even better within energy efficiency.Energy use for the housing- and service sector amounts to 166 TWh of total use at 616 TWh. Without distribution and conversion losses, these figures show that the housing- and service sector accounts for almost 40 % of the country's total energy consumption. As a part of this sector, there is in downtown Umeå a building complex named Thor that is contributing significantly to the energy consumption of the area. Thor is a building complex whose first phase of construction began in 1963 and has since then been built on over the years. The complex has several inefficient parts that waste energy and thus gives rise to substantial economic costs. In the Thor-building there are numerous venues in place with a large variety of stores. On the groundfloor there are some business premises. The rest of the houses consist of either offices- or apartment spaces. This gives rise to large air handling units and heating systems that must be able to deliver suffiecient power when required.This work is an investigation of the building complex Thor and its purpose is to find parts that are inefficient energy-wise and be able to provide suggestions for various improvements that would reduce costs and create profit with a short payback time.The investigated parts are the following: • Roof insulation • Exhaust fan to the loading bay • Supply and exhaust fans, "Tower" • Supply and exhaust fans, Kungsgatan 58 • Comfort Cooling • Heating coils • Main fuses The energy consumption for the different areas have been divided into two different parts, electricity- and heat consumption. Electricity consumption is roughly 500 MWh per year and the heat consumption is around 1020 MWh per year. This is only the consumption of the areas that have been investigated. After the energy efficient actions will be made, the heat use will instead decrease to 213 MWh, which is a considerable improvement. Electricity consumption after the actions will increase, but because of the economical electricity agreement Thor possesses, it will ultimately pay off. Straight pay off for heat exchangers in the "Tower" and the supply- and exhaust fans at Kungsgatan 58 is 2,09 year and 2,11 years respectively.This proves that large amounts of energy are lost to the surroundings, and that there is a big need of change.   A future project is to improve energy efficiency throughout the majority in large parts of Thor, so that one saves money rather than "blowing" it away. Riksbyggen was unsure if there were ventilation aggregates large enough to clear off the necessary volume flows at Kungsgatan 58. This report proved that they did in fact exist. The result of this report bodes well for future efforts to improve energy efficiency at Thor. This report can serve as a basis for future work. / Sverige är ett land som har kommit en bit i utvecklingen gällande energieffektiva lösningar. Problemet i Sverige är att många villor och flerbostadshus är gamla och har ineffektiva ventilation- och värmesystem. Denna energi går förlorad när systemen är ineffektiva vilket sedan resulterar i stora ekonomiska kostnader. Som tur är har fler och fler fått upp ögonen för detta vilket gör att Sverige är på god väg att bli ännu mer energieffektiva.   Energianvändningen för bostads- och servicedelen uppgår till 166 TWh av landets totala användning på 616 TWh. Dessa siffror visar att bostads- och servicedelen står för nästan 40 % av landets totala energianvändning. Inom denna faktor har ett område i Umeå stad ”dragit sitt strå i stacken” av användingen och detta område heter Thor. Thor är en bostadsrättsförening och började byggas 1963 och sedan byggts på under årens lopp. Området har flera ineffektiva delar som slösar energi och detta ger upphov till stora ekonomiska kostnader. De hus som finns på plats idag har olika typer av lokaler. På bottenvåningarna finns affärslokaler och resten av husen består av antingen kontorslokaler eller lägenheter. Detta ger upphov till stora ventilationsaggregat och värmesystem som ska klara att leverera rätt effekt när det behövs.   Detta arbete är en utredning av området för att hitta delar som är ineffektiva och för att sedan kunna ge förslag på olika förbättringar som skulle minska framförallt energi, kostnader och skapa vinst inom kort. De delar som har undersökts är: Takisolering Frånluftsfläkt till lastbrygga Till- och frånluftsfläktar, ”Tornet” Till- och frånluftsfläktar, Kungsgatan 58 Komfortkyla Värmeslingor Huvudsäkringar     Energiförbrukningen för de olika områdena har delats in i två olika delar, Elförbrukning och Värmeförbrukning. Elförbrukning hamnar på 529 MWh per år och värmeförbrukningen hamnar på 1020 MWh per år. Detta är då enbart för de områden som har utretts. Efter energieffektivisering av dessa så hamnar värmeanvändningen istället på 213 MWh vilket är betydligt mindre. Elförbrukningen kommer att höjas efter installation av aggregaten, men på grund av elpriserna som bostadsrättsföreningen har så kommer det löna sig relativt fort. Rak payofftid för värmeväxlare på ”Tornet” och till- och frånluftsfläktarna på Kungsgatan 58 ligger på vardera område på cirka 2 år. Detta är då ett bevis på att stora mängder energi går förlorad på detta område och därmed är det i stort behov av förändring   Ett framtida arbete är att energieffektivisera på stora delar av Thor så man sparar pengar och energi istället för att ”blåsa” bort dem. Riksbyggen var osäkra om det fanns aggregat som klarade flödena på Kungsgatan 58, vilket denna rapport bevisade. Resultaten från denna rapport bådar gott för framtida arbete för att energieffektivisera Thor. Denna rapport kan då ligga som grund till arbetet.
3

Analyse du comportement de l’abdomen lors d’un choc automobile pour l’amélioration de la biofidélité et de la prédiction des lésions abdominales par le mannequin de choc THOR / Abdomen Behaviour and Injury Mechanisms During a Crash : Definition of a New Injury Criterion Transferable to Anthropomorphic Test Devices

Desbats, Romain 23 May 2016 (has links)
Les blessures de l'abdomen représentent une faible proportion (5%) des blessures lors d'accidents de la route mais elle augmente fortement pour les blessures sérieuses à sévères (16%). L'abdomen du mannequin THOR (Test Device for Human Occupant Restraint), destiné aux futures réglementations de choc frontal, nécessite des améliorations de sa biofidélité et un critère de blessure. Le travail présenté est en trois parties :Premièrement, les paramètres principaux de la réponse mécanique de l'abdomen du THOR et de Sujets Humain Post Mortem (SHPM) sous chargements impacteur et ceinture furent identifiés à l'aide d'un modèle mécanique simplifié. La comparaison des paramètres mécaniques du THOR et des SHPM a mis en évidence les changements nécessaires pour l'amélioration de la biofidélité. Il apparaît que la viscosité équivalente du THOR doit être augmentée d'un facteur 5 et que l'interaction avec la pièce bassin doit être modifiée du fait qu'elle augmentait la rigidité d'un facteur 8. Ces changements furent inclus dans le modèle Éléments Finis (EF) d'un abdomen prototype incluant des capteurs de pression APTS (Abdominal Pressure Twin Sensors) pour caractériser le chargement de l'abdomen.Deuxièmement, la réponse mécanique du prototype a été évaluée en simulations d'essais charriot, ce qui a montré que l'abdomen prototype a peu d'influence sur la cinématique globale du mannequin mais que la flexion du tronc peut faire augmenter la pression dans les APTS. Cela a mené à des recommandations supplémentaires au niveau de la conception de l'abdomen.Finalement, en vue de définir un critère de blessure pour l'abdomen, la pression des APTS a été corrélée aux blessures des organes décrites dans les études sur SHPM de la littérature ou prédites par le modèle EF humain THUMS / Abdominal injuries represent a small proportion (5%) of road crash injuries but their proportion increases considerably with regard to serious and severe injuries (16%). The abdomen of the Test device for Human Occupant Restraint (THOR), intended to be used in future frontal impact assessments, needs further developments regarding its biofidelity and injury criterion. The work performed in this thesis project was in three folds: Firstly, the main parameters of the THOR and Post Mortem Human Subjects (PMHS) abdomen responses under impactor and seatbelt loadings were identified using a lumped element model. The comparison between the THOR and the PMHS mechanical parameters highlighted desired changes for THOR abdomen biofidelity improvement. It was found that THOR material viscosity should be increased by 5 and that interaction with the pelvis flesh should be modified as it increased by 8 the abdomen stiffness. These changes were included in the Finite Element (FE) model of an existing abdomen prototype which is equipped with Abdominal Pressure Twin Sensors (APTS) to quantify the abdomen load. Secondly, the response of the prototype was evaluated in sled test simulations which showed that the prototype abdomen had little influence on the dummy overall kinematics but that the torso flexion could increase the pressure in the APTS. This led to additional recommendations regarding the abdomen design. Finally, for the abdominal injury criterion definition, the APTS pressure was correlated with organ injuries as reported in published PMHS tests or as predicted by THUMS human FE model
4

Om pinterism, wagnerianism och modéensk pilsnerslang : En studie av svenska kulturskribenters bruk av kulturreferenser

Stoorhöök, Kim January 2012 (has links)
Via kulturskribenters sätt att hänvisa till andra kulturella fenomen kan allt från kultursyn till läsartilltal utläsas. I denna uppsats kommer det redogöras för svenska kulturjournalisters bruk av kulturreferenser. Avsikten är att undersöka varför kulturskribenterna använder sig av detta grepp, vad de anser vara god kultur, hur läsarna tilltalas och hur referenser som bryter barriären mellan hög- och populärkultur används. Detta kommer att granskas utifrån ett kultursociologiskt perspektiv och de teorier som kommer appliceras på frågeställningarna är Pierre Bourdieus teorier om habitus, fältet och det kulturella kapitalet. Till det tillkommer ethosdiskussioner och resonemang kring den implicite läsaren och den implicite författaren. Materialel består av dagstidningarna Aftonbladet, Dagens Nyheter, Expressen och Svenska Dagbladets kultursidor under en nyhetsvecka. Undersökingen har både kvantitativa och kvalitativa aspekter. Resultaten visar att kulturreferenser i de flesta fallen är en rent estetisk utsmyckning av en text, alternativt används för att sätta in ett ämne i en viss historisk kontext. Detta kan vara ett sätt för skribenten att stärka sin trovärdighet. Vanligtvis refereras det till företeelser som är inom samma kulturella sfär som det som avhandlas, därefter är referenser till företeelser som förknippas med ett högre kapital vanligast. Att referera till kulturyttringar med ett lägre kulturellt kapital är ytterst ovanligt. Det som förknippas med ett högt kulturellt kapital betraktas oftast som bra kultur och när populärkulturella ämnen pryds med sådana referenser är det ett sätt att stärka det populärkulturella ämnets värde.
5

Thor: The Hybrid Online Repository

Van Der Horst, Timothy W. 02 March 2005 (has links)
Digital credentials enable users to perform secure interactions by proving either their identity or that they posses certain attributes. Special care is taken to protect these credentials and their associated private keys during transaction time. However, protection of these items outside of the transaction is often delegated to a secure credential repository. A mobile environment creates significant challenges for secure repositories. We examine these challenges with respect to existing repository practices and produce a set of requirements that a repository must meet in order to cope with the harshness of a mobile environment. We also present the design and implementation of Thor (The hybrid online repository), a system that fulfills these requirements. Thor leverages preexisting local and remote repositories and enhances their usability and security through centralized management, credential context subsets, and credential identifier obfuscation.
6

Tor och den nordiska åskan : Föreställningar kring världsaxeln / Thor and the Nordic Thunder : Conceptions connected to the world axis

Bertell, Maths January 2003 (has links)
No description available.
7

Bluetooth Communication For Remote Controlling Purpose / Bluetooth-kommunikation för fjärrstyrningsändamål

Florén, Johan, Lindberg, Daniel January 2004 (has links)
The concept of remote controlling electrical devices is not new; people of today are used to being able to control their household electronic items without making an effort to walk up to the device. In this thesis the aim is to use Bluetooth radio signals instead of the traditional infrared light to achieve the remote control functions. As a test application a Sony Compact Disc player is modified in order to be radio controlled with a standard Ericsson T39 mobile phone used as a remote. Since the test application is rather simple without any special requirements the development of a specific radio communication system has not been considered. Instead available pre-manufactured devices were examined. A Bluetooth evaluation kit was purchased and the test project consisted of the goal of linking the evaluation board to the CD player with an AVR microcontroller and getting the whole system to communicate with the mobile phone.
8

Bluetooth Communication For Remote Controlling Purpose / Bluetooth-kommunikation för fjärrstyrningsändamål

Florén, Johan, Lindberg, Daniel January 2004 (has links)
<p>The concept of remote controlling electrical devices is not new; people of today are used to being able to control their household electronic items without making an effort to walk up to the device. </p><p>In this thesis the aim is to use Bluetooth radio signals instead of the traditional infrared light to achieve the remote control functions. As a test application a Sony Compact Disc player is modified in order to be radio controlled with a standard Ericsson T39 mobile phone used as a remote. Since the test application is rather simple without any special requirements the development of a specific radio communication system has not been considered. Instead available pre-manufactured devices were examined. A Bluetooth evaluation kit was purchased and the test project consisted of the goal of linking the evaluation board to the CD player with an AVR microcontroller and getting the whole system to communicate with the mobile phone.</p>
9

En värderingsfeminism utan statlig paternalism : Om Ebba Busch Thors "nya feminism" och formuleringen av kvinnors intressen

Annlinn, Mickelsson January 2018 (has links)
No description available.
10

Biomechanical Responses of Human Surrogates under Various Frontal Loading Conditions with an Emphasis on Thoracic Response and Injury Tolerance

Albert, Devon Lee 04 June 2018 (has links)
Frontal motor vehicle collisions (MVCs) resulted in 10,813 fatalities and 937,000 injuries in 2014, which is more than any other type of MVC. In order to mitigate the injuries and fatalities resulting from MVCs, new safety restraint technologies and more biofidelic anthropomorphic test devices (ATDs) have been developed. However, the biofidelity of these new ATDs must be evaluated, and the mechanisms of injury must be understood in order to accurately predict injury. Evaluating the biomechanical response, injury mechanisms, and injury threshold of the thorax are particularly important because the thorax is one of the most frequently injured body regions in MVCs. Furthermore, sustaining a severe thoracic injury in an MVC significantly increases mortality risk. The overall objective of this dissertation was to evaluate the biomechanical responses of human surrogates under various frontal loading conditions. This objective was divided into three sub-objectives: 1) to evaluate the biofidelity of the current frontal impact ATDs, 2) to evaluate the effect of different safety restraints on occupant responses, and 3) to evaluate rib material properties with respect to sex, age, structural response, and loading history. In order to meet sub-objectives 1 and 2, full-scale frontal sled tests were performed on three different human surrogates: the 50th percentile male Hybrid III (HIII) ATD, the 50th percentile male Test Device for Human Occupant Restraint (THOR-M) ATD, and approximately 50th percentile male post-mortem human surrogates (PMHS). All surrogates were tested under three safety restraint conditions: knee bolster (KB), KB and steering wheel airbag (KB/SWAB), and knee bolster airbag and SWAB (KBAB/SWAB). The kinematic, lower extremity, abdominal, thoracic, and neck responses were then compared between surrogates and restraint conditions. In order to assess biofidelity, the ATD responses were compared to the PMHS responses. For both the kinematic and thoracic responses, the HIII and THOR-M had comparable biofideltiy. However, the HIII responses were slightly more biofidelic. The ATDs experienced similar lower extremity kinetics, but very different kinetics at the upper and lower neck due to differences in design. Evaluation of the different restraint conditions showed that the SWAB and KBAB both affected injury risk. The SWAB decreased head injury risk for all surrogates, and increased or decreased thoracic injury risk, depending on the surrogate. The KBAB decreased the risk of femur injury, but increased or decreased tibia injury risk depending on the surrogate and injury metric used to predict risk. In order to meet sub-objective 3, the tensile material properties of human rib cortical bone and the structural properties of whole ribs were quantified at strain rates similar to those observed in frontal impacts. The rib cortical bone underwent coupon tension testing, while the whole ribs underwent bending tests intended to simulate loading from a frontal impact. The rib material properties accounted for less than 50% of the variation observed in the whole rib structural properties, indicating that other factors, such as rib geometry, were also influencing the structural response of whole ribs. Age was significantly negatively correlated with the modulus, yield stress, failure strain, failure stress, plastic strain energy density, and total strain energy density. However, sex did not significantly influence any of the material properties. Cortical bone material properties were quantified from the ribs that underwent the whole rib bending tests and subject-matched, untested (control) ribs in order to evaluate the effect of loading history on material properties. Yield stress and yield strain were the only material properties that were significantly different between the previously tested and control ribs. The results of this dissertation can guide ATD and safety restrain design. Additionally, this dissertation provides human surrogate response data and rib material property data for the validation of finite element models, which can then be used to evaluate injury mitigation strategies for MVCs. / PHD

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