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  • 1.
    Abbassi, Selma
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Engström, Rickard
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Algoritm för lokalisering av referensnoder med Indoor Positioning System2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Indoor Positioning Systems lokaliserar människor och objekt inomhus med hjälp av minst tre kända referenspunkter. System för inomhuspositionering som använder kända referenspunkter kallas anchor-based lokalisering medan de som beräknar deras positioner själva kallas anchor-free lokalisering. Syftet med detta arbete är att utveckla en algoritm som är anpassad efter ett anchor-free lokaliseringssystem. Den ska vara oberoende av nätverksuppkopplingen, hårdvaran och hur avstånden mellan mottagare och sensorer beräknats. Utgångspunkten för algoritmen är enbart avstånd mellan en mottagare och tre sensorer vilket kan beskrivas som arbetets huvudsakliga problem.

    Algoritmen implementerades i Java med en simulering som återspeglar positioneringen i en perfekt miljö och sedan testas på en Android-applikation. Simuleringen tillåter användaren att rita ut flera mätpunkter som skapar en rutt. Dessa mätpunkter utnyttjas för att dynamiskt lokalisera referenspunkterna och mätpunkterna genom att hitta ett minsta avstånd mellan sensorerna. Dessa avstånd kan beskrivas som sidorna för en referenstriangel som möjliggör att ett koordinatsystem kan spännas upp.

    Resultatet av den empiriska studien visade en felmarginal mellan 0,3-6 m utan signalstörningar, vilket inte var tillräckligt noggrant. Efter att algoritmen implementerats lades fokus på en korrigering som kan itereras igenom för att uppskatta bättre mätvärden för referenstriangeln. Korrigeringen gav positiva resultat med lägre felmarginal. Arbetet kan vidareutvecklas genom att implementeras i ett verkligt IPS-system och algoritmen kan förbättras genom att skapa utökade funktioner som kan hantera fler än tre beacons.

  • 2.
    Abens, Maria
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Outdoor Education in Mathematics: Can it be implemented?2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study examines outdoor education in mathematics at an international school under the IB PYP curriculum. Students spend most of their time indoors with the exception of lunch recess. Outdoor education provides a new and different way for both teachers and students to get fresh air. Research indicates that children who spend more time outdoors suffer less from allergies and other health problems. In the study, teachers and parents were given questionnaires, and three mathematics lessons were conducted outdoors.  Students were later interviewed in groups. Most parents and teachers were positive to the idea of academic outdoor lessons in any subject. Teachers saw some difficulties implementing it because of time, weather and behavioural problems with students outside. Furthermore, they agreed that children should spend more time outside and that the children’s health might benefit. Most of the students enjoyed the outdoor mathematics lessons. They were positive towards outdoor education in any subject.

  • 3.
    Abraham, David
    et al.
    Lunds Universitet.
    Ryrholm, Nils
    University of Gävle, Department of Mathematics, Natural and Computer Sciences, Ämnesavdelningen för naturvetenskap.
    Witzell, Håkan
    Lunds Universitet.
    Scoble, Malcolm
    British Museum of Natural History.
    Holloway, Jeremy
    British Museum of Natural History.
    Löfstedt, Christer
    Lunds Universitet.
    Molecular phylogeny of the subfamilies in Geometridae (Geometroidea: Lepidoptera.)2001In: Molecular Phylogenetics and Evolution, ISSN 1055-7903, E-ISSN 1095-9513, Vol. 20, p. 65-77Article in journal (Refereed)
  • 4.
    Abrahamsson, Emil
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Digitalt arkiv2008Student paper second term, 10 points / 15 hpStudent thesis
    Abstract [sv]

    Grunden för detta arbete har varit att förenkla hantering och sökning bland ritningar och förteckningar i ett ritningsarkiv. Lösningen har blivit ett webbaserat datasystem som bygger på en databas där all information lagras och är sökbar. Resultatet har blivit ett system som man oavsett var man befinner sig inom företagets nätverk ha tillgång till alla ritningar och förteckningar på ett snabbt och effektivt sätt.

  • 5.
    Abrehdary, M.
    et al.
    Royal Inst Technol KTH, Div Geodesy & Satellite Positioning, S-10044 Stockholm, Sweden..
    Sjöberg, L. E.
    Royal Inst Technol KTH, Div Geodesy & Satellite Positioning, S-10044 Stockholm, Sweden..
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Royal Inst Technol KTH, Div Geodesy & Satellite Positioning, S-10044 Stockholm, Sweden..
    Modelling Moho depth in ocean areas based on satellite altimetry using Vening Meinesz-Moritz' method2016In: Acta Geodaetica et Geophysica, ISSN ISSN 2213-5812, EISSN 2213-5820, Vol. 51, no 2, p. 137-149Article in journal (Refereed)
    Abstract [en]

    An experiment for estimating Moho depth is carried out based on satellite altimetry and topographic information using the Vening Meinesz-Moritz gravimetric isostatic hypothesis. In order to investigate the possibility and quality of satellite altimetry in Moho determination, the DNSC08GRA global marine gravity field model and the DTM2006 global topography model are used to obtain a global Moho depth model over the oceans with a resolution of 1 degrees x 1 degrees. The numerical results show that the estimated Bouguer gravity disturbance varies from 86 to 767 mGal, with a global average of 747 mGal, and the estimated Moho depth varies from 3 to 39 km with a global average of 19 km. Comparing the Bouguer gravity disturbance estimated from satellite altimetry and that derived by the gravimetric satellite-only model GOGRA04S shows that the two models agree to 13 mGal in root mean square (RMS). Similarly, the estimated Moho depths from satellite altimetry and GOGRA04S agree to 0.69 km in RMS. It is also concluded that possible mean dynamic topography in the marine gravity model does not significantly affect the Moho determination.

  • 6.
    Abrehdary, Majid
    et al.
    Department of Environment and Life Sciences, Geomatics Section, University of Karlstad, Karlstad,Sweden; Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Lars, Sjöberg
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology(KTH), Sweden.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Sampietro, Daniele
    GReD s.r.l., Como, Italy.
    Towards the Moho depth and Moho density contrast along with their uncertainties from seismic and satellite gravity observations2017In: Journal of Applied Geodesy, ISSN 1862-9016, E-ISSN 1862-9024, Vol. 11, no 4, p. 231-247Article in journal (Refereed)
    Abstract [en]

    We present a combined method for estimating a new global Moho model named KTH15C, containing Moho depth and Moho density contrast (or shortly Moho parameters), from a combination of global models of gravity (GOCO05S), topography (DTM2006) and seismic information (CRUST1.0 and MDN07) to a resolution of 1° × 1° based on a solution of Vening Meinesz-Moritz’ inverse problem of isostasy. This paper also aims modelling of the observation standard errors propagated from the Vening Meinesz-Moritz and CRUST1.0 models in estimating the uncertainty of the final Moho model. The numerical results yield Moho depths ranging from 6.5 to 70.3 km, and the estimated Moho density contrasts ranging from 21 to 650 kg/m3, respectively. Moreover, test computations display that in most areas estimated uncertainties in the parameters are less than 3 km and 50 kg/m3, respectively, but they reach to more significant values under Gulf of Mexico, Chile, Eastern Mediterranean, Timor sea and parts of polar regions. Comparing the Moho depths estimated by KTH15C and those derived by KTH11C, GEMMA2012C, CRUST1.0, KTH14C, CRUST14 and GEMMA1.0 models shows that KTH15C agree fairly well with CRUST1.0 but rather poor with other models. The Moho density contrasts estimated by KTH15C and those of the KTH11C, KTH14C and VMM model agree to 112, 31 and 61 kg/m3 in RMS. The regional numerical studies show that the RMS differences between KTH15C and Moho depths from seismic information yields fits of 2 to 4 km in South and North America, Africa, Europe, Asia, Australia and Antarctica, respectively.

  • 7.
    Abrehdary, Majid
    et al.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Sjöberg, Lars E.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Combined Moho parameters determination using CRUST1.0 and Vening Meinesz-Moritz model2015In: Journal of Earth Science, ISSN 1674-487X, E-ISSN 1867-111X, Vol. 26, no 4, p. 607-616Article in journal (Refereed)
    Abstract [en]

    According to Vening Meinesz-Moritz (VMM) global inverse isostatic problem, either the Moho density contrast (crust-mantle density contrast) or the Moho geometry can be estimated by solving a non-linear Fredholm integral equation of the first kind. Here solutions to the two Moho parameters are presented by combining the global geopotential model (GOCO-03S), topography (DTM2006) and a seismic crust model, the latter being the recent digital global crustal model (CRUST1.0) with a resolution of 1A(0)x1A(0). The numerical results show that the estimated Moho density contrast varies from 21 to 637 kg/m(3), with a global average of 321 kg/m(3), and the estimated Moho depth varies from 6 to 86 km with a global average of 24 km. Comparing the Moho density contrasts estimated using our leastsquares method and those derived by the CRUST1.0, CRUST2.0, and PREM models shows that our estimate agrees fairly well with CRUST1.0 model and rather poor with other models. The estimated Moho depths by our least-squares method and the CRUST1.0 model agree to 4.8 km in RMS and with the GEMMA1.0 based model to 6.3 km.

  • 8.
    Abrehdary, Majid
    et al.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Sjöberg, Lars E.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    The spherical terrain correction and its effect on the gravimetric-isostatic Moho determination2016In: International Journal of Geophysics, ISSN 1687-885X, E-ISSN 1687-8868, Vol. 204, no 1, p. 262-273Article in journal (Refereed)
    Abstract [en]

    In this study, the Moho depth is estimated based on the refined spherical Bouguer gravity disturbance and DTM2006 topographic data using the Vening Meinesz-Moritz gravimetric-isostatic hypothesis. In this context, we compute the refined spherical Bouguer gravity disturbances in a set of 1° × 1° blocks. The spherical terrain correction, a residual correction to each Bouguer shell, is computed using rock heights and ice sheet thicknesses from the DTM2006 and Earth2014 models. The study illustrates that the defined simple Bouguer gravity disturbance corrected for the density variations of the oceans, ice sheets and sediment basins and also the non-isostatic effects needs a significant terrain correction to become the refined Bouguer gravity disturbance, and that the isostatic gravity disturbance is significantly better defined by the latter disturbance plus a compensation attraction. Our study shows that despite the fact that the lateral variation of the crustal depth is rather smooth, the terrain affects the result most significantly in many areas. The global numerical results show that the estimated Moho depths by the simple and refined spherical Bouguer gravity disturbances and the seismic CRUST1.0 model agree to 5.6 and 2.7 km in RMS, respectively. Also, the mean value differences are 1.7 and 0.2 km, respectively. Two regional numerical studies show that the RMS differences between the Moho depths estimated based on the simple and refined spherical Bouguer gravity disturbance and that using CRUST1.0 model yield fits of 4.9 and 3.2 km in South America and yield 3.2 and 3.4 km in Fennoscandia, respectively.

  • 9. Adams, Robin
    et al.
    Fincher, Sally
    Pears, Arnold
    Börstler, Jürgen
    Boustedt, Jonas
    University of Gävle, Department of Mathematics, Natural and Computer Sciences, Ämnesavdelningen för datavetenskap.
    Dalenius, Peter
    Eken, Gunilla
    Heyer, Tim
    Jacobsson, Andreas
    Lindberg, Vanja
    Molin, Bengt
    Moström, Jan-Erik
    Wiggberg, Mattias
    What is the word for 'Engineering' in Swedish: Swedish students conceptions of their discipline2007Report (Other academic)
    Abstract [en]

    Engineering education in Sweden – as in the rest of the world – is experiencing a decline in student interest. There are concerns about the ways in which students think about engineering education, why they join an academic programme in engineering, and why they persist in their studies. In this context the aims of the Nationellt ämnesdidaktiskt Centrum för Teknikutbildning i Studenternas Sammanhang project (CeTUSS) is to investigate the student experience and to identify and support a continuing network of interested researchers, as well as in building capacity for disciplinary pedagogic investigation.

    The Stepping Stones project brings together these interests in a multi-researcher, multi-institutional study that investigates how tudents and academic staff perceive engineering in Sweden and in Swedish education. The first results of that project are reported here. As this study is situated uniquely in Swedish education, it allows for exploration of “a Swedish perspective” on conceptions of engineering. The Stepping Stones project was based on a model of research capacity-building previously instantiated in the USA and Australia (Fincher & Tenenberg, 2006).

  • 10.
    Ahlmén, Caroline
    University of Gävle. University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Hemligheten bakom populära animerade karaktärer2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Vad gör en framgångsrik animerad karaktär? Homer Simpson, Svampbob Fyrkant och Eric Cartman kommer att analyseras och jämföras för att hitta vad som gör just dem så populära. Därefter kommer de psykologiska aspekterna att granskas. Varför tilltalar dessa karaktärer människor? Riktlinjer för hur man skapar en populär animerad karaktär kommer att utvecklas utifrån resultatet av utredningen.

  • 11.
    Ahmed, Dolovan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Fadul, Mohammed Erik Jamal
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Utsläpp från svenska reningsverk till Östersjön: Granskning av Henriksdals reningsverk, Ryaverket, Sjölunda reningsverk, Kungssängsverket och Duvbackens reningsverk2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    From domestic and industrial waste water will have to be cleaned before it can be released into lakes and streams again. This purification takes place through various stages of treatment plants. Wastewater contains many substances that are harmful to the environment as well as human and animal health, so it is important that the purification that is done is done in an efficient and thoughtful manner. The steps that are common in Swedish cleaning plants are mechanical, biological and chemical purification. These purification steps ensure that larger particles do not come out to the open water, convert nitrogen into nitrogen through the activation process, and that by chemical treatment, the emission of phosphorus is reduced. All of these purification steps can be designed differently and vary from purification plants to purification plants. Therefore, the degree of purification and emissions can distinguish between different treatment plants. Because there are many factors involved in the processes at Swedish waste treatment plants, it is important to carry out annual audits to detect problems that can lead to environmental damage.If cleaning does not work, exercise can increase in lakes and seas, which causes people and animals to suffer. Bottom dead and acid deficiency are already a major problem for the Baltic Sea. In order to reduce the negative environmental effects, emissions of nutrients are drastically reduced. This concerns the release of nutrients from all countries around the Baltic Sea.This study focuses on nitrogen and phosphorus purification from 5 wastewater treatment plants, Henriksdal's purification plant (Stockholm), Ryaverket (Gothenburg), Sjölunda purification plant (Malmö), Kungssängsverket (Uppsala) and Duvbacken purification plant (Gävle). Information about its activities has been obtained through interviews and works own reports.The purification plants use different technical solutions, and all treatment plants meet today's requirements for purification. The biggest difference is the degree of nitrogen purification. All wastewater treatment plants have a history of changes in technical solutions to improve treatment. Cleaning wastewater from households and industries costs a lot of money for the treatment plants, so it's always a challenge for the wastewater treatment plants to clean the water in the best possible way without costing too much.It is expected that the cleaning requirements will be tightened and all treatment plants should continue to develop to increase efficiency. Current purification requirements are designed to suit the recipient's sensitivity. If the EU's idea of ​​the same degree of purification across the country is transformed into requirements, Duvbacken will need to significantly improve the nitrogen treatment at the waste water treatment plant.

  • 12.
    Ahonen-Jonnarth, Ulla
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Computer science.
    Odelstad, Jan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Computer science.
    Simulation as a tool for the evaluation of forest management treatments2010In: ESM'2010 - The 2010 European Simulation and Modelling Conference / [ed] Gerrit K. Janssens, Katrien Ramaekers and An Caris, Ghent: EUROSIS-ETI , 2010, p. 426-433Conference paper (Refereed)
    Abstract [en]

    Cleaning of young forest stands is a multicriteria problem with conflicting goals. This kind of forest management treatment is performed by human beings but it is possible that this work may be performed by artificial agents in the future. The artificial agents need detailed information about how to clean a forest stand and/or what are the goals for cleaning. One problem in development of cleaning rules for artificial cleaning agents is that explicit knowledge about good cleaning results is not detailed. In this paper we present a tool for developing and testing rules and judging evaluation functions for cleaning. We illustrate this tool by presenting examples of some ways to clean forest stands in a computer environment and we present how the cleaning results can be evaluated. In order to obtain material for experiments it is also possible to simulate forest stands using this tool.

  • 13.
    Ahrné, Karin
    et al.
    SLU.
    Bengtsson, Bengt Åke
    Björklund, Jan-Olof
    Cederberg, Björn
    Eliasson, Claes
    Hydén, Nils
    Jonasson, Jan
    Lindeborg, Mats
    Lst Kalmar Län.
    Ohlsson, Anders
    Palmqvist, Göran
    Ryrholm, Nils
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Biology.
    Rödlista över fjärilar Lepidoptera2015In: Rödlistade arter i Sverige 2015 / [ed] Westling, Anna, Uppsala: ArtDatabanken SLU , 2015, p. 98-112Chapter in book (Other academic)
  • 14.
    Aktan, Mikael
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Dynamic hair effects2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    Creating three dimensional hair is still one of the hardest elements when creating characters. Problems occur because of the constant changes in the software every few years. A major goal is to create as realistic hair as possible in Autodesk Maya and to supply this detailed information on to other 3D artist. Techniques are researched and reviewed on how different hair systems are created, as well as how dynamic effects react on the moving hair.

  • 15.
    Al-Asadi, Hind
    University of Gävle, Faculty of Education and Business Studies, Department of Culture Studies, Religious Studies and Educational Sciences.
    Hur elever med matematiksvårigheter kan få stöd genom alternativa undervisningsmetoder: En studie gjorde med hjälp av dataprogrammet GeoGebra i ett sociokulturellt sammanhang2013Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
  • 16.
    Ali, Fadi
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Urban classification by pixel and object-based approaches for very high resolution imagery2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Recently, there is a tremendous amount of high resolution imagery that wasn’t available years ago, mainly because of the advancement of the technology in capturing such images. Most of the very high resolution (VHR) imagery comes in three bands only the red, green and blue (RGB), whereas, the importance of using such imagery in remote sensing studies has been only considered lately, despite that, there are no enough studies examining the usefulness of these imagery in urban applications. This research proposes a method to investigate high resolution imagery to analyse an urban area using UAV imagery for land use and land cover classification. Remote sensing imagery comes in various characteristics and format from different sources, most commonly from satellite and airborne platforms. Recently, unmanned aerial vehicles (UAVs) have become a very good potential source to collect geographic data with new unique properties, most important asset is the VHR of spatiotemporal data structure. UAV systems are as a promising technology that will advance not only remote sensing but GIScience as well. UAVs imagery has been gaining popularity in the last decade for various remote sensing and GIS applications in general, and particularly in image analysis and classification. One of the concerns of UAV imagery is finding an optimal approach to classify UAV imagery which is usually hard to define, because many variables are involved in the process such as the properties of the image source and purpose of the classification. The main objective of this research is evaluating land use / land cover (LULC) classification for urban areas, whereas the data of the study area consists of VHR imagery of RGB bands collected by a basic, off-shelf and simple UAV. LULC classification was conducted by pixel and object-based approaches, where supervised algorithms were used for both approaches to classify the image. In pixel-based image analysis, three different algorithms were used to create a final classified map, where one algorithm was used in the object-based image analysis. The study also tested the effectiveness of object-based approach instead of pixel-based in order to minimize the difficulty in classifying mixed pixels in VHR imagery, while identifying all possible classes in the scene and maintain the high accuracy. Both approaches were applied to a UAV image with three spectral bands (red, green and blue), in addition to a DEM layer that was added later to the image as ancillary data. Previous studies of comparing pixel-based and object-based classification approaches claims that object-based had produced better results of classes for VHR imagery. Meanwhile several trade-offs are being made when selecting a classification approach that varies from different perspectives and factors such as time cost, trial and error, and subjectivity.

          Classification based on pixels was approached in this study through supervised learning algorithms, where the classification process included all necessary steps such as selecting representative training samples and creating a spectral signature file. The process in object-based classification included segmenting the UAV’s imagery and creating class rules by using feature extraction. In addition, the incorporation of hue, saturation and intensity (IHS) colour domain and Principle Component Analysis (PCA) layers were tested to evaluate the ability of such method to produce better results of classes for simple UAVs imagery. These UAVs are usually equipped with only RGB colour sensors, where combining more derived colour bands such as IHS has been proven useful in prior studies for object-based image analysis (OBIA) of UAV’s imagery, however, incorporating the IHS domain and PCA layers in this research did not provide much better classes. For the pixel-based classification approach, it was found that Maximum Likelihood algorithm performs better for VHR of UAV imagery than the other two algorithms, the Minimum Distance and Mahalanobis Distance. The difference in the overall accuracy for all algorithms in the pixel-based approach was obvious, where the values for Maximum Likelihood, Minimum Distance and Mahalanobis Distance were respectively as 86%, 80% and 76%. The Average Precision (AP) measure was calculated to compare between the pixel and object-based approaches, the result was higher in the object-based approach when applied for the buildings class, the AP measure for object-based classification was 0.9621 and 0.9152 for pixel-based classification. The results revealed that pixel-based classification is still effective and can be applicable for UAV imagery, however, the object-based classification that was done by the Nearest Neighbour algorithm has produced more appealing classes with higher accuracy. Also, it was concluded that OBIA has more power for extracting geographic information and easier integration within the GIS, whereas the result of this research is estimated to be applicable for classifying UAV’s imagery used for LULC applications.

  • 17.
    Ali, Rafef
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Matematik och estetiska lärprocesser: en studie om ämnesintegration av estetiska verktyg i matematikundervisning.2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Syftet med undersökningen var att observera hur lärarna arbetar med matematik i årskurserna F-3, med fokus på hur estetiska verktyg används i matematikundervisningen. Studien är baserad på klassobservationer i två årskurser i de tidigare skolåren F-3 samt elev- och lärarintervjuer och ämnade lyfta estetiska lärprocesser samt hur de spelar in på elevernas upplevelser vad gäller ämnesintegration i matematikundervisning. Resultaten visar att estetiska verktyg används mer med yngre elever och mindre ju äldre eleverna blir. Lärarna i denna studie påpekade att ett ämnesövergripande arbetssätt och att blanda in olika sinnen främjar elevernas inlärning. Majoriteten av de intervjuade lärarna betonade att det gäller att hitta en balans mellan olika metoder för att skapa en varierad undervisning. 

  • 18.
    Allaire, G.
    et al.
    Ecole Polytechnique, Palaiseau Cedex, France.
    Pankratova, Iryna
    Narvik University College, Narvik, Norway.
    Piatnitski, A.
    Lebedev Physical Institute RAS, Moscow, Russia.
    Homogenization and concentration for a diffusion equation with large convection in a bounded domain2012In: Journal of Functional Analysis, ISSN 0022-1236, E-ISSN 1096-0783, Vol. 262, no 1, p. 300-330Article in journal (Refereed)
    Abstract [en]

    We consider the homogenization of a non-stationary convection–diffusion equation posed in a bounded domain with periodically oscillating coefficients and homogeneous Dirichlet boundary conditions. Assuming that the convection term is large, we give the asymptotic profile of the solution and determine its rate of decay. In particular, it allows us to characterize the “hot spot”, i.e., the precise asymptotic location of the solution maximum which lies close to the domain boundary and is also the point of concentration. Due to the competition between convection and diffusion, the position of the “hot spot” is not always intuitive as exemplified in some numerical tests.

  • 19.
    Allaire, G.
    et al.
    Ecole Polytechnique, Palaiseau Cedex, France.
    Pankratova, Iryna
    Narvik University College, Narvik, Norway; Ecole Polytechnique, Palaiseau Cedex, France.
    Piatnitski, A.
    Narvik University College, Narvik, Norway; Lebedev Physical Institute RAS, Moscow, Russia.
    Homogenization of a nonstationary convection-diffusion equation in a thin rod and in a layer2012In: SeMA Journal, ISSN 1575-9822, Vol. 58, no 1, p. 53-95Article in journal (Refereed)
    Abstract [en]

    The paper deals with the homogenization of a non-stationary convection-diffusion equation defined in a thin rod or in a layer with Dirichlet boundary condition. Under the assumption that the convection term is large, we describe the evolution of the solution’s profile and determine the rate of its decay. The main feature of our analysis is that we make no assumption on the support of the initial data which may touch the domain’s boundary. This requires the construction of boundary layer correctors in the homogenization process which, surprisingly, play a crucial role in the definition of the leading order term at the limit. Therefore we have to restrict our attention to simple geometries like a rod or a layer for which the definition of boundary layers is easy and explicit.

  • 20.
    Almström, Erica
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Att förstå evolution genom laboration2012Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Undersökningar visar att elever har svårt att ta till sig evolutionsteorin och i stället väljer att förklara evolutionen med icke vetenskapliga argument. Till exempel väljer de att förklara fjällharens vita vinterpäls med att en vit päls gör att den syns sämre. Det här är ett exempel på att eleverna gärna förklarar evolutionen som behovsstyrd. En laboration utformades för att illustrera hur variation och urval ger evolution i en plantpopulation. Laborationen går ut på att eleverna under en tid studerar en population med plantor som utsätts för torka. Plantorna har olika simulerade genotyper och kommer därför att reagera olika på torkstressen. Tanken med laborationen var att få elever att använda sig av mer vetenskapliga förklaringar till evolutionen istället för icke veteskapliga. Resultaten visar att eleverna ändrat uppfattning, men inte riktigt till en mer vetenskaplig förklaring utan de har gått från sin tidigare förklaringsmodell till att inte riktigt kunna förklara vad som händer vid evolution.

  • 21.
    Alsins, J.
    et al.
    University of Uppsala, Department of Physical Chemistry, Uppsala, Sweden.
    Björling, Mikael
    Royal Institute of Technology, Physical Chemistry, Stockholm, Sweden.
    Furó, I.
    Royal Institute of Technology, Physical Chemistry, Stockholm, Sweden.
    Egle, V.
    University of Uppsala, Department of Physical Chemistry, Uppsala, Sweden; Latvian State Inst. of Wood Chem., Riga, Latvia.
    Dimer formation of a stilbenesulphonic acid salt in aqueous solution1999In: Journal of Physical Organic Chemistry, ISSN 0894-3230, E-ISSN 1099-1395, Vol. 12, no 3, p. 171-175Article in journal (Refereed)
    Abstract [en]

    The steady-state and time-resolved fluorescence and 1H NMR spectra of a stilbenesulphonic acid salt, commonly used as an optical brightening agent, was studied as a function of concentration in aqueous solution. The aggregates, formed at higher concentrations, were shown to be predominantly dimers with the central stilbene moieties of the molecules stacked plane-parallel. The equilibrium constant for the dimer formation at 25°C was obtained from both NMR and fluorescence measurements.

  • 22.
    Ameen, Havar
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Sabra, Zakaria
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Moderna processutvecklingsverktyg för organisationer2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna C-uppsats ämnar att studera prioriteringar hos användare i ett system för processutveckling, med syftet att skapa underlag för en omarbetad implementation. I vissa organisationer handlar det om att öka utnyttjandegraden av investerade resurser, och en sådan plattform ger en bättre kontroll över vilka delar i ett system som påverkas av processförändringar. Underlaget för den konkreta implementation bestod till stor del av resultaten från en enkätstudie, där slutanvändare av ett existerande prototypsystem fick dela med sig av sina synpunkter. Resultatet från studien kombinerades också med relevanta vetenskapliga artiklar och litteraturstudier för att skapa underlag för modellen för den nya plattformen. En stor faktor som påvisades utifrån studien är behovet av tillgänglighet. Detta innefattar bl.a. tydligare relationer mellan entiteter, koncis presentation av data och snabbare informationsåtkomst. Modellen som skapats representerar ett system där fokus på ett dynamiskt och responsivt gränssnitt i kombination med tillgänglighet och logiska arbetsflöden utgör plattformen.

  • 23.
    Amin, Ahmed Angelus
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Morales, Federico
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Positionering och tid som faktorer i mobilanpassade enkäter: En kontextmedveten prototyp2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Det finns ett ökat problem med att färre personer väljer att delta i enkätundersökningar, både vad gäller webbenkäter och traditionella postenkäter. En möjlig lösning på problemet skulle kunna vara att ta tillvara på det faktum att det blir allt vanligare att personer väljer att använda sig av mobila enheter för att lösa vardagssysslor. Kanske kan man bättre använda sig av den tekniska utvecklingen och samhällsutvecklingen som allt mer går över till digitala lösningar och på så sätt bidra till ett ökat deltagande i enkäter. Denna uppsats har undersökt om det är möjligt att använda tekniken kontextmedvetenhet för att skapa mobilanpassade enkäter. Detta genom att tillverka en prototyp av en mobilapplikation som kan skicka frågor till smartphones beroende på dess position. Det är möjligt genom mobila enheters egna GPS-mottagare. Enligt den utvärdering som utförts finns det tecken på att användaren upplever det lättare att svara på frågor genom denna prototyp än deras tidigare upplevelser. Dessutom visar resultatet att funktionerna i vår kontextmedvetna prototyp fungerar så som önskat.

  • 24.
    Amselem, Yohanna
    University of Gävle. University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Hemträdgårdens Skafferi: inventering av ätbara, skötselextensiva växter för hemträdgården2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Hur vi lever och vad vi konsumerar får konsekvenser på miljön. Idag orsakar en stor del av livsmedelsproduktionen allvarliga miljöproblem. Att odla delar av sin mat i den egna trädgården bidrar till en ekologiskt hållbar livsstil, minskar den individuella miljöpåverkan och därmed det egna ekologiska fotavtrycket.  En allmän trend råder gentemot skötselextensiva trädgårdar, ofta anses det oförenligt med en nyttoträdgård. En utgångspunkt för detta arbete är att skötselextensiva odlingsmetoder kan vara av intresse för en växande målgrupp av miljömedvetna människor. Syftet med arbetet är att undersöka hur det går att förena skötselextensivitet med produktivitet i hemträdgården med tanke på växtval och komposition. Frågeställningar som besvaras är; vilka växter kan vara av intresse för den som vill odla skötselextensiva ätbara växter i sin hemträdgård? Hur kan dessa växter planteras så att trädgården blir skötselextensiv? Metoden som används är informationssökning i litteratur och internet.  I resultatets första del tas olika skötselextensiva kategorier av växter upp. Träd och buskar lyfts fram som dem mest skötselextensiva växtkategorierna. Även örtartade perenner innebär ett flertal fördelar när det gäller skötselextensivitet. Andra växtgrupper är perenna vattenväxter samt annueller och bienner som självsår sig. Odling av örtartade och vedartade ätliga perenner i form av polykulturer och skogsträdgårdar kan efter etableringsfasen innebära lite skötsel i förhållande till produktivitet. Därmed   anges polykulturer och skogsträdgårdar (en särskild form av polykultur) som exempel på skötselextensiv växtkomposition. Resultatets slutliga del består av en växtlista redovisad i tabeller och listar 233 ätbara växter som kan användas i skötselextensiva planteringar, inklusive träd, buskar, bambu, perenner, lökväxter,  vattenväxter samt annueller och bienner som självsår sig. Samtliga växter är härdiga i zon 3 och kallare. Dessa växter kan förslagsvis kombineras i polykulturer och skogsträdgårdar. Systemet som innebär att odla i skogsträdgårdar, det vill säga i flerskiktade planteringar av ätbara och användbara träd, buskar, perenner och marktäckare av skiftande höjd är ännu relativt obeprövad i zon 3  och kallare men har potential såväl för intresserade trädgårdsägare som för skolor och i annan pedagogisk och rekreativ verksamhet. Min förhoppning att  växtlistorna  underlättar för den som vill påbörja ett planteringsförsök, så väl i liten som i större skala.

  • 25.
    Amundsen, Nicklas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    The Possibilities and Limitations of Teaching Through Multi User Virtual Environments2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The use of computers has grown immensely in the last decades and the possibility to teach through them has grown as well. Various computer applications, games and forums have been created as tools of teaching and learning. This research project contains a summary of various works created within the E-learning area and their results. The virtual world Second Life is tested and some of the research in the literature review will be visited and examined. The research focuses on the feasibility to create scenarios for nursing students to practice patient care and handling, in addition to collaborative qualities that online virtual worlds offer. The conclusion taken from this research is that the possibilities far outweigh the limitations and that learning through virtual worlds should be further explored and developed.

  • 26.
    Andersson, Emelie
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Undersökningav oosporförekomst från kransalger i sediment från olika provtagningspunkter i en gloflad i Gårdskärsområdet2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Längs den svenska kusten verkar landhöjningen, en process där landet höjs efter den senaste istiden. Mest påtaglig är landhöjningen i Östersjön. Till följd av landhöjningen avsnörs grunda havsvikar från havet och bildar nya sjöar, så kallade flader, gloflader och glon. Målet med denna studie var att undersöka sediment från olika provtagningspunkter i en gloflad i Gårdskärsområdet i Lövstabukten (norra Uppland), för att se hur fördelningen av olika arter av kransalger varierat i glofladen under åren när miljön successivt förändrats. För att undersöka detta har oosporförekomst från kransalger i sediment studerats. I det undersökta området får landhöjningen verka ganska ostört, vilket gör det intressant att undersöka just detta område. Denna undersökning visar att Chara aspera, Chara globularis och Chara tomentosa tidigare funnits i den undersökta glofladen. C. aspera förekom vid samtliga fem provtagningspunkter och under längst tid, medan C. globularis noterades vid två provtagningspunkter och C. tomentosa fanns vid endast en provtagningspunkt och är den art som växt i glofladen under de senaste åren. Inga stora skillnader fanns i sedimentet mellan de fem olika provtagningspunkterna. Färgen varierade från mossigt grön och vattenrik i ytsediment till fast lera i de djupare delarna av sedimentet.  

  • 27.
    Andersson, Erik
    et al.
    Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden .
    Barthel, Stephan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering. Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden.
    Memory carriers and stewardship of metropolitan landscapes2016In: Ecological Indicators, ISSN 1470-160X, E-ISSN 1872-7034, Vol. 70, p. 606-614Article in journal (Refereed)
    Abstract [en]

    History matters, and can be an active and dynamic component in the present. We explore social-ecological memory as way to diagnose and engage with urban green space performance and resilience. Rapidly changing cities pose a threat and a challenge to the continuity that has helped to support biodiversity and ecological functions by upholding similar or only slowly changing adaptive cycles over time. Continuity is perpetuated through memory carriers, slowly changing variables and features that retain or make available information on how different situations have been dealt with before. Ecological memory carriers comprise memory banks, spatial connections and mobile link species. These can be supported by social memory carriers, represented by collectively created social features like habits, oral tradition, rules-in-use and artifacts, as well as media and external sources. Loss or lack of memory can be diagnoses by the absence or disconnect between memory carriers, as will be illustrated by several typical situations. Drawing on a set of example situations, we present an outline for a look-up table approach that connects ecological memory carriers to the social memory carriers that support them and use these connections to set diagnoses and indicate potential remedies. The inclusion of memory carriers in planning and management considerations may facilitate preservation of feedbacks and disturbance regimes as well as species and habitats, and the cultural values and meanings that go with them.

  • 28.
    Andersson, Fredrik
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Applikationsutveckling för Android2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta projekt handlar om ett applikationsutvecklingsprojekt för Androidplattformen vilket innefattar Androids uppbyggnad, Javaprogrammering, design i XML miljö, grunder i Eclipse samt publicering på Google Play (före detta Android market). Projektet resulterar i en Androidapplikation i form av ett enkelt Pongspel med olika funktioner som highscorelista samt att uppsatsen beskriver det man behöver kunna för att utveckla applikationer för Android.

  • 29.
    Andersson, Johan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Hiller, Thomas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Mobile Learning för elever med läs- och skrivsvårigheter2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna utredning visar att förekomsten av mobilapplikationer specifikt riktade till dyslektiker är i det närmaste obefintlig. Dessutom är forskningen på området M-Learning mest inriktad på integrerade M-Learning-system och inte på enskilda applikationer. M-Learning (mobilt lärande) är ett forskningsområde som kan sägas vara en vidareutveckling av E-Learning. Detta är ett växande forskningsområde och med explosionen av smarta telefoner och surfplattor bör för- och nackdelarna med  M-Learning kunna utnyttjas i större utsträckning. På uppdrag av Gävle kommun och med handledning av Sogeti har en prototyp mobilapplikation för elever med dyslexi utvecklats för Android-plattformen. Prototypen som framtagits visar att en mobilapplikation för elever med dyslexi med fördel kan utnyttja mobila enheters multimodalitet.

  • 30.
    Andersson, Karin
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Årsta Odlingar: Möjligheter och omöjligheter för en kommersiell grönsaksodling i stadsrummet2009Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 31.
    Andersson, Lorraine
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Pedagogisk verksamhet i botanisk trädgård- mer än växtkunskap2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I dag då allt fler människor bor i städer blir konsekvensen att kontakten med naturmiljöer minskar. Botaniska trädgårdar är då en betydelsefull plats för rekreation och välbefinnande i urban miljö. Allt sedan de första moderna botaniska trädgårdarna i mitten av 1500-talet anlades har undervisning varit en viktig del av trädgårdarnas verksamhet.

    Syftet med studien har varit att undersöka några botaniska trädgårdars pedagogiska verksamhet. Fokus har lagts på att ta reda på hur trädgårdarna arbetar med pedagogiska/sociala projekt. En central utgångspunkt i botaniska trädgårdarnas pedagogiska och sociala verksamhet är människans beroende av växter. För att inse växterna/naturens betydelse för människors vardagliga liv har det visat sig att tillämpad botanik är den metod som allmänheten har haft lättast att ta till sig.

    Tre svenska och tre utländska botaniska trädgårdar valdes ut för att ingå i studien. Metoden jag använt mig av är litteraturstudier kombinerat med kvalitativa intervjuer. Framgångsfaktorer avseende den pedagogiska verksamheten, som sker i de botaniska trädgårdarna, är bland annat samarbete med andra organisationer samt möjligheten till delaktighet i närområdets aktiviteter. Odlings- och trädgårdsprojekten genererar positiva effekter både för individen och lokalsamhället. Under studiens gång har mer och mer framkommit, att botaniska trädgårdar är en viktig resurs vad gäller att driva och utveckla en pedagogisk/social verksamhet.

     

  • 32.
    Andersson, Magnus
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Bergviksäpplet och dess fruktsättning2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Trees of Bergvik apple (Bergviksäpple) planted between 2001 and 2007 have shown varying harvest. This study investigates why some trees gets low or no harvest while others get significantly higher harvest. The aim is to identify some reasons why fruiting differs between the trees and if possible suggest and/or enlighten the tree owners what can be done to improve fruiting. The study includes 25 trees, mostly located in Hälsingland, Sweden. The tree owners have answered two questionnaires, first in the spring with questions regarding flowering and the second in the autumn, regarding harvest. The answers to these questionnaires form the foundation for this work.

    The result of the study reveals differences in harvest. Older trees and/or trees with good vegetative growth have larger harvest while trees with poor growth in some cases didn’t even get flowers. Younger trees with good growth gave good harvest. This concludes that the single most important factor to get good harvest is good vegetative growth.

  • 33.
    Andersson, Marcus
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Programmering i skolan: Vad är det enligt lärarna?2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna uppsats är främst att undersöka hur lärare definierar begreppet programmering och hur definitionen inverkar på undervisningen. Undersökningen har genomförts med hjälp av metoderna enkätundersökning och intervjuer. Olika uppfattningar förekom, inte minst bland respondenterna i enkätundersökningen, men de intervjuade lärarna definierade programmering främst som att styra någonting. Deras beskrivning av den genomförda undervisningen antyder att denna uppfattning inverkar på utformningen av undervisningen. Det relativt begränsade underlaget i undersökningen gör att resultaten är svåra att generalisera.

  • 34.
    Andersson, Maria
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Ett gestaltningsförslag på en trädgård anpassad till äldre vårdtagare och personer med demenssjukdom i särskilt boende2009Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 35.
    Andersson, Martin
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Olofsson, Marcus
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Methods for Freezing Time with Computer Graphics Imagery2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The most effective method to create an illusion of frozen time in film media was explored for this research. Starting with a description and evaluation of different methods of achieving the effect, this document describes the implementation of a specific technique for a particular project to test freezing time. It was also established to aid students in their understanding of the process in both pre- and post-production. After testing and researching, the method of filming still-posing actors with a high speed camera was chosen. However, the testing and pre-production phase demanded a large amount of time, therefore for the remainder of the project only one scene was established. For budget and time consuming purposes the two recommended techniques are; camera projection and filming still-posing actors with a high speed camera. The choice between these two methods mainly depends on the amount of camera movement.

  • 36.
    Andersson, Sandra
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Fysisk aktivitets betydelse för hälsan: Hur arbetar pedagoger inom årskurs 1-3 med detta?2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet fokuserar på fysisk aktivitet och hälsa inom årskurs 1–3. Syftet är att belysa på vilka sätt pedagoger arbetar för att öka elevers förståelse kring fysisk aktivitets betydelse för hälsan och vilken påverkan detta har på eleverna. Urvalsgruppen är verksamma pedagoger. Undersökningen är en kvalitativ forskningsansats med semistrukturerade intervjuer som har kompletterats med ”critical incidents” observationer. Resultatet visar att pedagogerna ofta upprepar fysisk aktivitets betydelse för hälsan för att öka elevernas förståelse kring detta, genom samtal och fysiska aktivitets upplevelser. Kunskap om människokroppen anses även behövas. Slutsatser är att kroppsuppfattning - kunskap om människokroppen, förmåga att använda sin kropp och fysiska aktiviteter - är viktigt för barns förståelse om dess betydelse för hälsan. Studiens resultat ger idéer till pedagoger inom skolan om olika arbetssätt kring fysisk aktivitet för att skapa förståelse, främja hälsosamma vanor och bättre förutsättningar för lärande. Resultatet antyder att elevers totala skolprestationer förbättras av fysisk aktivitet.

  • 37.
    Andersson, Sebastian
    University of Gävle, Department of Mathematics, Natural and Computer Sciences, Ämnesavdelningen för datavetenskap.
    Karaktärsdesign: från koncept till färdig spelkaraktär2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Denna rapport innefattar skapandeprocessen för en spelkaraktär. Vilka metoder som används i dagens industri och vilka verktyg som artisterna använder för att en 3dkaraktär till next-gen spel. Den undersöker även vilka slags tekniker som används för att skapa en personlighet och ett utseende som gör karaktären minnesvärd. Vilka metoder som kan användas för att skapa en viss känsla hos karaktärer. Rapporten går också igenom en av alla de olika vägarna man kan ta för att skapa en karaktär från koncept till färdig spelkaraktär. Detta med hjälp av välkända program och tekniker som används.

  • 38.
    Andersson, Tomas
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Controlling the fluid dynamics: an analysis of the workflow of fluids2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    A scene containing dynamic fluids can be created in a number of ways. There are two approaches that will highlight the problems and obstacles that might occur. Today’s leading fluid simulator, RealFlow, simulates the fluid dynamics. A comparison between the two approaches will be made and are analyzed. Through experimentation, one of the approaches fails to produce the set requirements in the experiment and furthermore the two approaches differ in efficiency.

  • 39.
    Andersson, Tony
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Habitatval hos yngel av öring (Salmo trutta) i en undersökning i Nedre Dalälven2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this project was to examine important parameters for juvenile brown trout habitat selection in their first months after hatching. The study was carried out after approximately 30 000 fry had been released by the County Administrative Board of Gävleborg. Data on habitat selection was collected from five different localities at the river Dalälven, near Gysinge, Sweden. The method of estimating preferred habitat was to determine remaining fry after a period of seven weeks by electrofishing.

    This study confirms that the optimal local habitat choice for juvenile trout is where the substrate size 60- 200 mm is present and a hypothesis is proposed that this substrate is of importance for juvenile trout survival as it gives shelter in the presence of predators. Based on previous research the study gives some suggestions to which important habitat characteristics that were missing where no trout were recaptured.

  • 40.
    Andersson Younas, Nikolina
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    För att eleverna verkar tänka bättre när de får prata: Vilka metoder kan man hitta hos lärare som främjar diskussioner i matematik2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Syftet med arbetet är att söka reda på olika metoder lärare använder i klassrumssituationer för att stödja elevernas utveckling i matematiska uttryck gällande muntlig kommunikation mellan elever och lärare. Arbetet är baserat på observationer av tre lärare i årskurs 4, 6 och 9. Insamlad information från observationerna har resulterat i tre olika lektionsstrukturer och ett antal frågemodeller. Gemensamt i samtliga lektioner är att eleverna får först diskutera och berätta innan läraren blanda sig i; läraren har använt elevernas samtal för att bygga vidare och utgår på det sättet utifrån elevernas kunskaper. Vissa lektioner har fokus legat i diskussionen och elevers presentation av sina lösningar för klassen. I andra lektioner har läraren använt en specifik didaktisk metod för att stimulera diskussionen och elevernas förståelse. Samtliga lärare uttrycker att ett mål de haft är att eleverna skall få chansen att diskutera och ge uttryck för sina tankar verbalt.

  • 41.
    Andersson-Sköld, Yvonne
    et al.
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Klingberg, Jenny
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden.
    Gunnarsson, Bengt
    Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden.
    Cullinane, Kevin
    School of Business Economics and Law, University of Gothenburg, Gothenburg, Sweden.
    Gustafsson, Ingela
    City of Gothenburg, Parks and Landscape Administration, Gothenburg, Sweden.
    Hedblom, Marcus
    Department of Forest Resource Management, Landscape Analysis, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Knez, Igor
    University of Gävle, Faculty of Health and Occupational Studies, Department of Social Work and Psychology, Psychology.
    Lindberg, Fredrik
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden.
    Ode Sang, Åsa
    Department of Landscape Architecture, Planning and Management, Swedish University of Agricultural Sciences, Alnarp, Sweden.
    Pleijel, Håkan
    Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden.
    Thorsson, Pontus
    Division of Applied Acoustics, Chalmers University of Technology, Gothenburg, Sweden.
    Thorsson, Sofia
    Urban Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden.
    A framework for assessing urban greenery's effects and valuing its ecosystem services2018In: Journal of Environmental Management, ISSN 0301-4797, E-ISSN 1095-8630, Vol. 205, p. 274-285, article id S0301-4797(17)30940-4Article in journal (Refereed)
    Abstract [en]

    Ongoing urban exploitation is increasing pressure to transform urban green spaces, while there is increasing awareness that greenery provides a range of important benefits to city residents. In efforts to help resolve associated problems we have developed a framework for integrated assessments of ecosystem service (ES) benefits and values provided by urban greenery, based on the ecosystem service cascade model. The aim is to provide a method for assessing the contribution to, and valuing, multiple ES provided by urban greenery that can be readily applied in routine planning processes. The framework is unique as it recognizes that an urban greenery comprises several components and functions that can contribute to multiple ecosystem services in one or more ways via different functional traits (e.g. foliage characteristics) for which readily measured indicators have been identified. The framework consists of five steps including compilation of an inventory of indicator; application of effectivity factors to rate indicators' effectiveness; estimation of effects; estimation of benefits for each ES; estimation of the total ES value of the ecosystem. The framework was applied to assess ecosystem services provided by trees, shrubs, herbs, birds, and bees, in green areas spanning an urban gradient in Gothenburg, Sweden. Estimates of perceived values of ecosystem services were obtained from interviews with the public and workshop activities with civil servants. The framework is systematic and transparent at all stages and appears to have potential utility in the existing spatial planning processes.

  • 42. Andrienko, Gennady
    et al.
    Dykes, JasonJiang, BinUniversity of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Urban and regional planning/GIS-institute.
    GeoViz Hamburg 2011: Linking geovisualization with spatial analysis and modeling2011Collection (editor) (Refereed)
  • 43.
    Andréasson, Frida
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Barns sätt att benämna och uppfatta geometriska former: En observation och intervjustudie med förskolebarn2010Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Syftet med arbetet är att undersöka hur barn i åldrarna tre till sex år uppfattar de geometriska formerna i sin närmiljö, utan att någon vuxen påvisar formerna. I undersökningen ingår även att se vilka former barnen känner till och hur de benämner formerna. Metoderna som använts i undersökningen är intervjuer och observationer. Huvudresultatet var att barnen såg olika geometriska former i sin förskolemiljö. Hur barnen benämnde formerna varierar mellan matematisk benämning och vardagsbenämning och även egen påhittad benämning. Att förskolorna arbetar olika med matematik gör ingen skillnad för hur barnen benämner formerna.

    Viktig Slutsats: Barnen benämner de geometriska formerna med samma benämning som de vuxna i barnens omgivning använder sig av.

  • 44.
    Angermann, Lutz
    et al.
    Clausthal University of Technology, Clausthal, Germany..
    Shestopalov, Yury V.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics. University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Yatsyk, Vasyl
    O. Ya, Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine.
    Mathematical models for scattering and generation of plane wave packets on layered cubically polarisable structures2013In: Far East Journal of Applied Mathematics, ISSN 0972-0960, Vol. 81, no 1-2, p. 1-31Article in journal (Refereed)
    Abstract [en]

    The paper deals with different formulations of mathematical models for the analysis of processes of resonance scattering and generation of plane wave packets on isotropic, nonmagnetic, linearly polarised media with a nonlinear, layered dielectric structure of cubic polarisability. For each formulation, sufficient conditions for the existence and, partially, uniqueness of the corresponding solution are derived.

  • 45.
    Angermann, Lutz
    et al.
    Technische Universität Clausthal, Institut für Mathematik, Clausthal-Zellerfeld, Germany .
    Shestopalov, Yury V.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Yatsyk, Vasyl V.
    O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine .
    Eigenmodes of linearised problems of scattering and generation of oscillations on cubically polarisable layers2015In: Inverse Problems and Applications / [ed] Larisa Beilina, Springer-Verlag New York, 2015, Vol. 120, p. 67-80Conference paper (Refereed)
    Abstract [en]

    In the frequency domain, the resonant properties of nonlinear structures are determined by the proximity of the scattering/generation frequencies of the nonlinear structures to the complex eigenfrequencies of the corresponding homogeneous linear spectral problems with the induced nonlinear permeability of the medium. Here the case of cubically polarisable, canalising, and decanalising layers is considered.

  • 46.
    Appel, Madeleine
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Kulturarvets mosaiklandskap i ny tappning för trädgårdar och balkonger: En litteraturstudie med designförslag som bidrag för bevarandet av mångfalden för solitära bins överlevnad2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract. The purpose of this study is to find out what can be done in gardens and balconies for solitary bees survival, species have already been lost or are red-listed because of poor conditions in terms of habitat. What can design-proposals look like for gardens and balconies? What do suitable habitats contain and what do threats look like for solitary bees?The goal with this literature study was to find answers to my questions. Based on facts that emerged from the results, design proposals have been made for gardens and balconies. Increased biotope-surface from ancient times mosaic-landscape can in modern environments like gardens and balconies be designed as non-toxic and flower-rich meadows, flowering border zones, ditches and flower beds, potted plants, flowering trees and shrubs. Solitary bees need shelter, water to drink and food to eat as in nectar and pollen-rich plants. They need flowering plants from early spring to late autumn to survive. It´s important to spread knowledge and understanding how solitary bees live their lives, that people can cooperate to achieve long-term sustainable habitat solutions. Solitary bees need many flowering plant-surfaces that can act as dispersal corridors in to urban environments, where every single square meter flowering-surface is of importance. Solitary bees increase in number with increasing biotope-surfaces which are facts that design proposals are based on. Devastating threats for solitary bees are floral shortage in urban areas, spraying with various poisons, domestic bees spreading diseases, human fear of small insects and altered habitats.

  • 47.
    Ardavan, Mehdi
    University of Gävle, Department of Technology and Built Environment.
    Metamaterial: A field magnitude dependent and frequency independent model2008Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
    Abstract [en]

    In all attempts to analyze and realize Left-Handed materials, so far, most researchers have used the same idea of extracting only some or certain behaviors of Metamaterials from a set of unit cells gathered together in a designed order. Nevertheless meeting all criteria in order to consider a media as real double-negative material has never come true.

    Starting with criticizing and arguing the validity of calling any set of unit cells as a medium of propagation, the work at hand will go further demonstrating analogies between a medium which could be assigned permittivity or permeability factors and the medium consisting a set of unit cells.

    After presenting the critical analysis on previous studies in the field, here it is shown that it is impossible to build Metamaterials using any number of passive unit cells. A deep insight into the concept of phase and group velocities as well as Poynting’s vector will reveal weakness of the public perception of their relation with each other. Unlike the past and current trend in analyzing these two velocities in meta-materials, they will be proven to possess the same direction.

    Moreover, in this work, a solid proof over violation of energy conservation in the intersection plane between a normal material and a Left Handed material is presented which requires us to believe and accept generation of energy at this plane. This view will consequently leave meaningless all attempts to build meta-materials by passive elements.

    In present work a method is proposed at which a material with positive permittivity and permeability can behave like and yield all characteristics of Metamaterials only if the foregoing parameters, while remaining positive, can vary and be governed by the magnitude of the electromagnetic field. Independence of this method from frequency broadens the range of its application and also the interest it may attract.

  • 48.
    Arola, Helena
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Den skötselextensiva trädgården: Åtgärdsförslag för en lättskött trädgård i samband med en nybyggd villa2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I samband med ett bygge av en privatvilla ställs man inför många val. Det är inte ovanligt att trädgården hamnar i skymundan i förhållande till alla interiöra beslut som ska fattas.

    Min utgångspunkt i den här uppsatsen är att det finns en efterfrågan på lättskötta trädgårdar bland ägare till nybyggda villor i Gävle. Genom intervjuer med tio familjer som nyligen ”blivit med trädgård” och genom intervjuer med människor med erfarenhet i byggbranschen har jag tagit fram åtgärdsförslag för den skötselextensiva trädgården.

  • 49.
    Asami - Johansson, Yukiko
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    A study of a problem solving oriented lesson structure in mathematics in Japan2011In: Proceedings of the  seventh Congress  of  the  European  Society  for  Research  in Mathematics Education (CERME 7), Rzeszów, Poland.: Universitetsforlaget, 2011Conference paper (Refereed)
    Abstract [en]

    This paper presents and analyses “Mondaikaiketsu no jugyou” which translates to “the problem solving oriented – approach”.  It is a set of didactic techniques with the aim of motivating the students’ positive attitude toward engaging in mathematical activities and fostering mathematical thinking. As an analytical tool, The Anthropological Theory of Didactics (ATD) will be applied.

  • 50.
    Asami - Johansson, Yukiko
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Applying problem solving oriented lesson structure in Swedish lower secondary school: With a viewpoint of the anthropological theory of didactics (ATD)2011In: Proceedings of the 44th congress of Japanese mathematical education / [ed] Japanese society for research in mathematics education, Tokyo: Japanese society for research in mathematics education , 2011, p. 1051-1052Conference paper (Refereed)
1234567 1 - 50 of 1342
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