SAAB AB är intresserad av att kunna utrusta JAS 39 Gripen med en "Arrestor Hook" då denna typ av nödbromssystem är vanligare i andra flygvapen än det system som svenska flygvapnet använder. Uppgiften var att göra ett konstruktionsförslag av denna "Arrestor Hook" bom och krok för kommande arbete.För att göra detta förslag valdes att dela upp arbetet i fyra steg, faktainsamlig, konceptframtagande, konceptval och bearbetning.Valet av vilka detaljer som skulle ingå i förslaget var böjd bom med med fast krok. På kroken monterades en släpsko för att underlätta fångandet av vajern och att tjäna som den detalj som skyddar kroken från slitage som uppstår mellan "Arrestor Hook" och banbeläggning. För att tillgodose alla krav på rörlighet som behövs på "Arrestor Hook" utrustas den med en leddetalj som ger tvåfrihetsgrader vilket även ger ett mindre moment på konstruktionen när vajern är fångad.Resultatet av den teoretiska analysen av de fyra förslagen visar att alla de uppsatta kraven kan mötas, dock behövs mer utvärdering och tester för att säkerställa detta. Ytterligare litteratur kring tillvägagångssättet att konstruera "Arrestor Hook" bör också tillföras för fortsatt arbete..

Denna rapport redogör kompressorns beteende i en turboladdare för ett givet arbetsintervall. Med det ökande behovet av lösningar till att sänka koldioxidutsläppen så har turboladdaren fått fler och nya användningsområden. Från att till en början vara en produkt som används för att öka motoreffekten så bidrar turboladdaren idag till att minska motorerna med bibehållen effekt och på sätt minimera utsläpp av exempelvis koldioxid.Surge är ett kritiskt tillstånd för turboladdaren som bör undvikas då det oscillerande trycket som uppstår vid surge kan leda till att turboladdaren och motorn skadas. Hur surge-tillståndet förekommer och dess negativa inverkan på turboladdaren beskrivs i denna rapport.Utförandet av arbetet har skett med hjälp av KTH CICERO strömningslabb som drivs av Competence Center for Gas Exchange (CCGEx) som är ett samarbete mellan KTH och näringslivet, strömningslabbet är byggt för att kunna analysera turboladdaren (Garrett GT1752). I denna rapport används strömningslabbet för att få en bättre uppfattning om vad som händer med kompressorn när den arbetar i surge.

In industrial control systems PID-control remains the prevalent strategy, also for processes that would benefit from model based control. The purpose of this thesis is to evaluate whether model based control can be readily implemented in an industrial control system. To this end a simulated surge tank with a simulated industrial control system is studied. For evaluation two scenarios with specified objectives are selected.Following a review of LQR and versions of MPC, Predictive Functional Control (PFC) is considered the most suitable for implementation. PFC is a form of MPC developed with industrial applications in mind and therefore has several advantages for implementation in an industrial control system.

Vattenfall Eldistribution AB distribuerar el till ca 900 000 kunder i Sverige. Det handlar om både privatkunder och företagskunder. Enheten Nätdrift vars driftcentral är placerad i Trollhättan har till uppgift att se till att elnätet är spänningssatt och att man skall minimera avbrottstiderna.Då dagens samhälle är allt mer beroende av störningsfri leverans av el är det viktigt att kartlägga faktorer som orsakar korta avbrott på nätet. Ett kort avbrott definieras som ett avbrott som varar allt från 100 millisekunder till 3 min. I myndigheternas föreskrifter finns inga krav angående hur frekvent korta avbrott får förekomma i elnätet, då dessa avbrott oftast är orsakade av åska och därmed omöjliga att förutse.

To be able to measure high-surge voltages and transients with short rise times youneed measuring instruments with a high sampling frequency and large Bandwidth.These surges and transients occur primarily at lightning but can also occur at forexample at connecting errors at an electrical switch-gear. This report describes thework with finding two solutions for measuring and log data from these surges andtransients. One temporary solution where a measurement program has beendeveloped. A second solution where different company solutions have been analyzedto decide which fits best. For these measurement solutions two solutions for bringingdown the voltage has been used.

To be able to measure high-surge voltages and transients with short rise times youneed measuring instruments with a high sampling frequency and large Bandwidth.These surges and transients occur primarily at lightning but can also occur at forexample at connecting errors at an electrical switch-gear. This report describes thework with finding two solutions for measuring and log data from these surges andtransients. One temporary solution where a measurement program has beendeveloped. A second solution where different company solutions have been analyzedto decide which fits best. For these measurement solutions two solutions for bringingdown the voltage has been used.

To be able to measure high-surge voltages and transients with short rise times youneed measuring instruments with a high sampling frequency and large Bandwidth.These surges and transients occur primarily at lightning but can also occur at forexample at connecting errors at an electrical switch-gear. This report describes thework with finding two solutions for measuring and log data from these surges andtransients. One temporary solution where a measurement program has beendeveloped. A second solution where different company solutions have been analyzedto decide which fits best. For these measurement solutions two solutions for bringingdown the voltage has been used.

ABB Surge arrestors in Ludvika have for a long time had a problem to keep the moisture at a steady state in the production of their ZnO-powder, that is used to produce varistors.Some black-box models of the spray drying process have been designed and evaluated to find a solution for the problem. After evaluating the collected data it has been found that variations in the supply voltage causes control difficulties for the operator. A cascade control system was designed, consisting of three PI control loops designed with lambda tuning. The disturbance in the supply voltagewas used as a feed forward in the control system.At the end of the project the control system was installed, and tests were made to verify the functionality of the regulator. It was shown that most of the variations in the moisture of the powder could be eliminated using small resources, through purchase of a process controller and four power meters.

This thesis falls within the realm of social studies, specifically social studies in literature, and attempts to establish whether the sub-genre of fantasy literature known as sword and sorcery contains elements which resemble the tenets of fascism. Robert E. Howard is considered the progenitor of the sub-genre and his stories have an influence on the nature of sword and sorcery literature today, 70 years after his death. Howards creation of the sub-genre coincides with the spread of fascist ideologies around the world in the 1930s and the study attempts a societal mirroring analysis of Howards texts. With the help of an analytical model based on fascism expert Robert O.

The purpose of this study is to examine which factors played an important role in the food price crisis of 2007-2008. Theories used are Microeconomic theory, explaining changes in supply and demand, and Macroeconomic theory, explaining the impact of changes in exchange rate on prices. A theory regarding speculation is also used to explain the impact of speculative activities effects on price. The method used is multiple regression analysis in order to determine the effects which ethanol production, oil price and dollar exchange rate had on the surge in the price of corn, rice and wheat.The data used is in monthly observations during the period 2005-2008. However, other factors are taken into consideration during the study, such as production quantity, stock size, economic growth, speculative activity and population growth.

This master thesis has been performed at Vattenfall Power Consultant in Gothenburg and Trollhättan for Vattenfall Vattenkraft. In this report vacuum circuit breaker in small-scale hydropower stations with the rated power 4 MVA and below has been studied. Models of the stations are modeled and analyzed in PSCAD/EMTDC to study the high voltage transients that are created after current chopping with vacuum circuit breaker. Vacuum circuit breaker may chop the current before it reaches zero value, which means that high voltage transients can be created. The equipment of the stations can be destroyed by high voltage transients.The purpose of this thesis is to examine the use of vacuum circuit breaker in small-scale hydropower stations and the risk for high voltage transients from current chopping.According to the results there is a risk of high voltage transients after current chopping with small synchronous generators in stations with the operating voltages 0.4 kV and 3.6 kV.

 In light of the resent surge in globalization, and the heightened competition that follows as a result of this, there has been an increase in the importance that is placed into understanding buyer behaviour. This increase has been seen since the realization that by building strong customer relationships it is much easier to reach these through the marketing communications that are put in effect. There are also a number of upsides to enlisting the customers at an early stage in product development, such as creating greater value and a stronger sense of involvement.Röhnisch is therefore trying to show a genuine interest in supplying the costumers needs as they adapt and evolve. In order to accomplish this strive towards gaining a deeper understanding into the thoughts and attitudes that precedes the buying behaviour they conduct regular surveys. To complement this, the purpose of this paper will be to determine the actual preferences and buying behaviour of the market segment that Röhnisch has chosen for themselves, and while doing so, keeping an emphasis on loyalty.

Samhällets utveckling i kombination med förändringar inom hälso- och sjukvården ökar risken att drabbas av en allvarlig händelse. Hälso- och sjukvården måste därför anpassas för att kunna hantera situationer med ett stort skadeutfall, i samma utsträckning som en oväntad minskning av tillgänglig kapacitet, till exempel vårdplatsbrist. Genom att hitta svagheter i verksamheten så ökar möjligheterna att åtgärda dessa och därmed förmågan att kunna upprätthålla de ordinarie målen för vård och behandling av patienter vid en allvarlig händelse. Syftet med denna studie var att utveckla och testa en arbetsmetod för att systematiskt kunna analysera och utvärdera katastrofmedicinsk beredskap, samt identifiera, orsaksbestämma, åtgärdsanalysera och mäta förmågan att hantera de för Landstinget i Östergötland (LiÖ) väsentliga områdena av katastrofmedicinskt beredskap. För detta ändamål utvecklades en arbetsmetod genom att kombinera en av Katastrofmedicinskt Centrum skapad strukturmall med den metod som Patientsäkerhetsenheten inom LiÖ använder sig av vid riskanalyser.

Research suggests that society's vulnerability to natural disasters along coasts could increase as a result of climate change, which is likely to lead to elevated sea levels and possibly an increase in the occurance of meteorological phenomena such as storms and tropical cyclones. Following the Indian Ocean tsunami disaster in 2004 and Hurricane Katrina in 2005, both of which received considerable media attention, empirical data has indicated that coastal vegetation might be able to protect and reduce damages to coastal communities during tsunami events and tropical cyclones.The aim of the essay has been to study the function of coastal ecosystems as protection against tsunami waves and storms from a risk management perspective, meaning that I have, through an overview of scientific articles, compiled current research on how coastal ecosystems can attenuate storm surges and tsunami waves, and analysed how this knowledge can be put into practice in coastal communities from a risk management perspective, i.e. if coastal ecosystems are a viable risk reduction measure, are practically applicable, and if so, how they could be applied.There is empirical evidence suggesting that coastal ecosystems, particularly mangroves, can reduce the strength of a tsunami wave, but full scientific consensus on this issue has not yet been reached. With regard to protection against storm surges, there is extensive scientific evidence that coastal vegetation can mitigate damages and reduce the height of a storm surge, although the wave has to traverse several kilometres inland through thick vegetation for the protection to be effective. A synthesis in the form of a figure regarding the many physical factors that influence wave development through coastal ecosystems has been created in an attempt to simplify and explain the phenomenon.The conservation and restoration of coastal ecosystems can be justified from a risk management perspective, but planting new forest belts for the purpose of disaster mitigation is quite unrealistic and can rarely be sustainable, since, for protection to be effective, the forest belt must extend several kilometres inland from the coast, and would thus likely prove difficult to implement along coastal societies..

In Sweden there has been a surge of interest in the films classified as pilsnerfilms, i.e. comicalfilms produced for little money in the 1930's and containing a more working class and/or ruralsetting then the so called "champagne comedies" from the same era. The concept"pilsnerfilm" is how ever a little vague and although the main focus of this paper ispilsnerfilms, it will also cover other types of comical films made in Sweden between the1930's and 1940's.This paper examines the now-existing network of people interested in these types of movies.It will do so by interviewing seven of the most prominent fans of movies made during the1930's and 1940's. Most of them are living in Stockholm. The paper discuss how through theconsumption of these types of films, a nostalgic gaze is created.