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569 Uppsatser om Mechanical fatigue - Sida 21 av 38

MPD-vågformer för helikopterradar

A helicopter based system equipped with a millimetre-wave fire control radar is studied for improvement of the detection probability for moving ground targets. The system is a pulse doppler radar that sends out the electromagnetic wave in repetitive pulses. The frequency in which radar sends this pulse is called Pulse Repetition Frequency (PRF). The velocity of the moving targets is measured by spectral analysis of the pulses received. With this sort of system some targets will not be possible to detect.

Extubering av neurointensivvårdspatienter

Bakgrund: Många av patienterna på en neurointensivvårdsavdelning (NIVA) vårdas med respirator under en längre eller kortare period av vårdtiden. Neurointensivvårdspatienterna bedöms ibland utifrån de kriterier för urträning och extubering som används på allmänna intensivvårdspatienter. Detta kan leda till för tidig extubation med reintubation som följd. Syfte: Redogöra för vilka kriterier som ska bedömas hos neurointensivvårdspatienter inför en extubering. Metod: Litteraturstudie.

Höghöjdsanpassning av BvS10 : Konceptstudie för optimering av överladdningssystem

This report relate a concept study that consider a number of different proposals to improve the overcharging system in BAE Systems Ha?gglunds tracked vehicle series BvS10, to maintain sealevel power at extreme altitude.At high altitude the power losses beacuase of the air density that decreases, which results in less fuel can be burned. The decreasing of air density also gives rise to fatigue failure of the turbocharger unless power is reduced.The proposals shall be as required by BAE Systems Ha?gglunds economically sustainable and defensible from a packing perspective. That means the selected solution must have a reasonable price tag and at the same time a minimal impact on adjacent components.The basis for this thesis is based on benchmarking of both the auto industry as the flight industry, to find inspiration and tips for improvement.Some of the concepts have after gathering facts and calculations been excluded while other solutions has been considered as workable and thus interesting for BAE Systems Ha?gglunds.Initially the current turbochargingsystem was analyzed in order to determine the starting point and thus be able to fix the current problems surrounding high altitude driving.

Energioptimering : Resteffektkylning av mellanlager för använt kärnbränsle (CLAB) Oskarshamn

This thesis is done in cooperation with SWECO Energuide in Växjö. They have been assigned by SKB in Oskarshamn to renew their electrical power supply and the ancillary processing systems in their Central provisional storage of spent nuclear fuel, CLAB. Today in the CLAB facility, the spent fuel is cooled down with water pumps, driven by asynchronous induction motors, where the water is regulated by mechanical valves to the desired flow. After the upgrade, the engines will be powered by AC drives that can control the pumps by changing the rotational speed and thus change the water's cooling effect on the nuclear fuel. In this study, I investigated the interference AC drives causes the feeding network and how to go about averting them.

Cytostatikabehandling vid cancersjukdom : Upplevelse av livskvalitet samt omvårdnadsåtgärder

Syftet med denna systematiska litteraturstudie var att beskriva patienters upplevelse av livskvalitet samt sjuksköterskans omvårdnadsåtgärder i samband med cytostatikabehandling vid cancersjukdom. För att besvara studiens syfte har sökning efter artiklar (n=17) genomförts i databaserna Blackwell Synergy samt Elin@Dalarna. Följande sökord har använts i olika kombinationer; cancer, patients, experience, nurse care, quality of life, scale, instrument, chemotherapy och care. Resultatet visade att cytostatikabehandlingen hade både positiv och negativ inverkan på patienternas livskvalitet. Livskvaliteten ökade då symtom lindrades.

Metodutveckling av självskattningsformulär för prestationsmätning av flygledare innan skiftstart

This paper was part of the ongoing cooperation between the Swedish Civil Aviation Authority and the Department of Psychology at Lund University. The purpose of this study was to develop a self-report measure regarding human factors, for the air traffic controllers to fill out before they start their working shift. This in order to aid the team leaders in their judgment regarding the air traffic controller's ability to perform at the right safety level. The self-report measure would also serve as an aid for the air traffic controllers who have a responsibility regarding their own performance. If successful this self-report measure would make it easier for the air traffic controllers to be alert regarding certain factors that can have a large impact on their performance.

Doing Business in China - A Best-practice Model for Foreign Invested Small and Medium-sized Enterprises (SMEs)

Foreign invested SMEs have recently become increasingly interested in China. The enterprises are in this report categorized as second wave companies since they follow the footsteps of previous pioneers, of which mostly were larger companies. The ambitions of the SMEs are either to sell products on the ever expanding Chinese market or to utilize the potential of low cost production for global markets. The existing literature is fragmented and solely based on the experience of larger companies. We believe that SMEs are facing new and different challenges, and thus a new generic theoretical frame work is desirable.

Arbetsterapi inom cancerrehabilitering : en litteraturstudie

Cancerrehabilitering definieras som en process vars mål är att förebygga och minska följder av cancer och cancerbehandling samt utgå från patientens problematik. Flera studier har visat att rehabilitering kan minska cancer- och cancerbehandlingarnas biverkningar. Syftet med studien var att kartlägga arbetsterapeutiska interventioner relaterade till personer som lever med cancer. En litteraturstudie med data från elva studier som representerade både kvantitativ och kvalitativ forskning genomfördes. Resultatet visade att vardagliga aktiviteter är viktiga för att patienterna ska kunna skingra sina tankar men även för att öka sin känsla av att vara kunnig.

Tre studenter med ADHD berättar om upplevelsen av att läsa i högre utbildning

Research shows that there is a lack of knowledge of adult students with ADHD. Most of all research focuses on children with ADHD in school. The purpose of this study was to gain a better understanding of how adult learners with ADHD experience academic studies related to cognitive difficulties, emotion, motivation, and their experience of SOC. The questions tried to determine how any cognitive difficulties and emotions are perceived, how students' motivation to study impacted and their experience of SOC based on studies in higher education. To answer the purpose and questions used qualitative interviews based on three students with ADHD using a hermeneutic method.

Inkluderande undervisning

Syftet med denna studie är att undersöka vilka likheter och skillnader i undervisningen som finns mellan en grundsärskoleklass och en grundskoleklass. Undersökningens metod är strukturerade observationer genomförda av två observatörer i en grundskoleklass och i en särskoleklass på samma skola. Olika aspekter av undervisningen observerades, av vilka några kan anses utgöra förutsättningar för en inkluderande undervisning. Dessa är: samarbete mellan pedagoger i undervisningen, ledarskapsmodeller, cooperativt lärande (samarbetsinlärning), dynamisk pedagogik samt samarbete mellan pedagoger i problemlösande undervisning. Resultatet visar på likhet mellan de båda skolformerna beträffande användandet av en organismisk modell med ett demokratiskt ledarskap, där grundsärskolans pedagoger endast använder det aningen mer frekvent än grundskolans pedagoger.

Hemodialys ? en del av livet : Patienters upplevelse av att leva med hemodialys

Bakgrund: I Sverige drabbas varje år 600 personer av kronisk njursvikt. Ett tillstånd som bidrar till att blodet inte renas från restprodukter. För att ersätta njurarnas förlorade funktion kan hemodialys utföras, en behandling som blir en stor del av patienternas vardag. Med god insikt kring hemodialys kan sjuksköterskan möta patientens sjukdomsupplevelse och lidande och så långt som möjligt lindra detta genom adekvata åtgärder. Syftet: Syftet var att belysa patienters upplevelse av att leva med hemodialys i det dagliga livet.

Screening av förstagradsanhöriga till yngrekranskärlssjuka patienter

Syftet med denna systematiska litteraturstudie var att beskriva patienters upplevelse av livskvalitet samt sjuksköterskans omvårdnadsåtgärder i samband med cytostatikabehandling vid cancersjukdom. För att besvara studiens syfte har sökning efter artiklar (n=17) genomförts i databaserna Blackwell Synergy samt Elin@Dalarna. Följande sökord har använts i olika kombinationer; cancer, patients, experience, nurse care, quality of life, scale, instrument, chemotherapy och care. Resultatet visade att cytostatikabehandlingen hade både positiv och negativ inverkan på patienternas livskvalitet. Livskvaliteten ökade då symtom lindrades.

Uppfyller BIM förväntningarna som arbetsmetod för broprojekt?

The purpose of this work is to design and construct a device able to measure the mechanical attrition of oxygen carrier particles. Those particles are used in chemical looping combustion and in the present situation there is a lack of knowledge in how the attrition process work and in which extension. To find already tested solutions trying to answering this problem a literature study wascarried out and the best solution found was the so called Grace-Davison Jet-Cup method. This method is supposed to emulate the attrition caused by a cyclone separator and its advantages are that it is possible to use small test amounts, 5-10 g, and a thirty minutes long test will be enough to acquire useable results. An device was designed based on the Jet-Cup method with some slight modifications.

Dubbskador på Alvestakubb

Mechanical harvesting may result in timber damages leading to reduced saw log quality. The initiator of this study was VIDA ? a privately owned concern operating in the value-adding process industry of forest raw materials. The aim of this study was to examine the type and amount of damages on Alvestakubb caused by the harvester head during the cutting process. The aim was also to compare the damages caused by different types of feed rollers and to evaluate the effects of temperature on damage occurrence.

Utveckling av hjulhållare för cykelhållare

This report is a bachelor thesis work within the field of Product Development and is also an assignment for Thule Sweden. The work has been performed by Niclas Tjäderborn and Christian Holm, students at the Mechanical Engineering Program with major in Product Development and Industrial Design at Jönköping School of Engineering during spring the semester of 2009.The thesis work concerned the development of a new wheel holder for bike carrier for Thule Sweden. The background to the project was that the initiator wanted a more user friendly wheel holder with better design than those available on the market. The wheel holder is able to be implemented on one or several of Thule?s current wheel holders.

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