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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

Experimental loss analysis of displacement controlled pumps

Lux, Jan, Murrenhoff, Hubertus January 2016 (has links)
Current efficiency measurements of variable hydraulic axial piston pumps are performed with the displacement system locked at maximum volume, thus without the controller. Therefore, the controller’s effect on the efficiency is not quantified at state of the art measurements. Former research on control systems mainly focused on the dynamic behaviour. This paper aims to quantify the losses in the displacement and control system and to research the dependencies of those. Therefore, a test rig is built up at IFAS to measure the control power of displacement controlled pumps. Furthermore, a simulation tool is developed to increase the understanding of the loss mechanisms of the investigated control systems. In conclusion, the paper shows the potential of efficiency improvements for displacement controlled pumps.
2

Digitalisering av ekonomifunktionen : En studie på tre fallföretag om konsekvenser avseende relationen mellan processer, hantering av information samt ekonomens förändrade roll

Jönsson, Malin, Rydhage, Lisa January 2019 (has links)
Bakgrund: Digitaliseringens utveckling har medfört en tilltagande mängd information samt en omfördelning av standardiserade arbetsuppgifter till ett kvalificerat arbete. Dessa konsekvenser har influerat ekonomifunktionen till högre krav på hantering av information och en förändring av ekonomens roll. Det belyses även att digitalisering av ekonomifunktionens standardiserade processer ger upphov till effektivitet men ingen vidare förståelse avseende hur detta influerar de icke-standardiserade processerna och ekonomens roll.    Syfte: Syftet med studien är att beskriva hur digitaliseringens utveckling påverkar ekonomifunktionens processer och därav vilka arbetsuppgifter som är möjliga att digitalisera. Vidare ämnar studien att analysera konsekvenserna, avseende krav på informationshantering samt ekonomens förändrade roll, som uppstår vid digitalisering av ekonomifunktionens processer. Studien avser därmed att utvidga befintlig kunskap genom att förklara relationen mellan processer, hantering av information samt ekonomens förändrade roll.     Metod: För att uppfylla studiens syfte har en fallstudie på tre fallföretag genomförts, där semistrukturerade intervjuer har utgjort grunden för empirisk datainsamling. Intervjuerna har genomförts för att skapa en helhetsuppfattning av digitaliseringens påverkan på ekonomifunktionen.    Slutsats: Det kan konstateras att relationerna mellan ekonomifunktionens processer, hanteringen av information samt ekonomens förändrade roll är avgörande för att uppnå en effektiv ekonomifunktion. Ekonomens analytiska- samt digitala kompetens i kombination med digitala system möjliggör för god informationshantering där värdefull information genereras. Detta främjar till ett större fokus vid de icke-standardiserade processerna och därmed ekonomens förmåga att analysera information och generera ett välgrundat beslutsunderlag. / Background: The development of the digitalization has brought an increasing amount of information as well as a redistribution of standardized activities to a more qualified work. These implications have influenced the accounting function with higher qualification of the information management and an evolution of the role of the economist. It is clear that the digitalization of the accounting function standardized processes has facilitated effectivity. However, there is a lack of understanding about how the non-standardized processes and the role of the economist have been affected by this.    Purpose: The aim of this study is to describe how the development of the digitalization is affecting the processes of the accounting function as well as what tasks that are possible to be digitalized. The aim is also to analyze the implications regarding the qualifications of the information management as well as the evolving role of the economist, that is influenced by the digitalization of the accounting function. The purpose with this study is also to contribute with greater knowledge by explaining the relationship between processes, information management and the evolving role of the economist.   Method: To fulfill the purpose of the study, a case study of three companies has been carried out, where semi-structured interviews have formed the basis for empirical data collection. The interviews have been conducted to create an overall view of the impact of digitization on the accounting function.   Conclusion: It can be concluded that the relations between the processes of the accounting function, the information management and the evolving role of the economist are crucial for achieving an efficient accounting function. The economist’s analytical and digital competence combined with digital systems enable a beneficial information management which create valuable information. This enable greater focus of the non-standardized processes and the economist ability to analyze the information and elaborate a favorable basis for decisions.

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