| 1. |
- Butt, Rehman, et al.
(author)
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Where do we go now? Anytime algorithms for path planning
- 2009
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Conference paper (peer-reviewed)abstract
- Commercial computer games has become one of the largest industries in the area of entertainment. Real Time Strategy (Rts) based games is one of the most important among different types of computer games and is also considered to be a good research platform within Artificial Intelligence (Ai). There exists a number of algorithms that can deal with the Ai related problems of this domain, e.g. the ones of getting as cheap or fast as possible from one point to another (i.e. path planning). However most of the algorithms used in academia are better suited for problems that do not need to be solved within tight time frames. Anytime algorithms (Aa) are algorithms that can be stopped at any point in time and yet come up with a preliminary solution. We believe that by making algorithms anytime, we can optimize their behaviors to better suit the Rts domain. This study will introduce a tool for evaluating path planning algorithms and compare the performances of A*, Recursive Best First Search (Rbfs), Potential Fields (Pf) and their anytime versions for the path planning problem.
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| 2. |
- Ivanova, T., et al.
(author)
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Structural and morphological characterization of sol-gel ZnO:Ga films : Effect of annealing temperatures
- 2018
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In: Thin Solid Films. - : ELSEVIER SCIENCE SA. - 0040-6090 .- 1879-2731. ; 646, s. 132-142
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Journal article (peer-reviewed)abstract
- Sol-gel technology has been successfully applied for obtaining ZnO:Ga films by spin coating method. Their structural and optical properties are studied depending on the doping contents and on the annealing temperatures varying from 300 to 600 degrees C. The Ga doping has been achieved by dissolving 1, 2 and 3 wt% Ga(NO3) into Zn sol solution. The structural analysis performed by X-Ray diffraction (XRD) shows a deterioration of the film crystallization with gallium incorporation. The XRD study reveals no impurity peaks associated to metallic gallium or gallium oxide phases. Vibrational properties have been characterized by Fourier Transform Infrared (FTIR) spectroscopy. FTIR analysis gives no certain evidence for presence of Ga oxide phases, but the absorption bands are clearly affected by Ga additive and there can be possible overlapping of Zn-O and Ga-O vibrations. The sol-gel ZnO:Ga films possess higher transparency in the visible spectral range compared to zinc oxide films. The optical band gaps of ZnO:Ga films are found to be widening due to gallium doping. The film morphology is investigated by Atomic force microscopy and it has been found that Ga doping in ZnO affects significantly the film morphology. The surface roughness of ZnO:Ga films is smaller compared to ZnO.
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| 4. |
- Berglund, Richard
(author)
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Engagemang efterfrågas: Hur tre tillverkande företag söker medverkan från sina medarbetare när de inför Lean
- 2010
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Doctoral thesis (other academic/artistic)abstract
- Organizations and their management want committed and engaged co-workers. Involvement, participation and active contribution from workers are particularly sought when lean production is introduced. Researchers and external stakeholders often question the motives behind these aspirations from managers and question whether they deserve to be regarded as sincere. Thus, it is of interest to investigate the balance between speech, action and effect. Three manufacturing companies have been followed during a four-year period via interviews, observations and workplace investigations. These companies work with the lean concept and their managements have explicitly declared the importance of their workers’ participation. The thesis investigates the intentions and actions within these companies and seeks to understand the reasoning behind their actions, and the effect of these actions. The guiding question for the research is: How does management seek to elicit commitment within the organization, and what practical steps does it take to achieve this aim? Ten themes were derived from mental models and guiding principles for organizational development in the industrial environment, mainly but not wholly related to the lean concept: 1 Vision and strategy 2 Mutual trust 3 Top management’s active participation 4 Long-term thinking 5 Individual adaptation 6 Responsibility and authority in teams 7 Influence 8 Challenge 9 Learning 10 Sharing the benefits Within each of the themes previous research and thinking are reviewed, core observations and other data are discussed and conclusions are reached for that theme. The companies are active in all theme areas, but to a different extent. There are also large differences between and within the companies and during the time span of the project. At some occasions, shortcomings have been observed when it comes to putting intentions into practice, not least due to the influence of external factors. At other times, substantial progress in implementation has been recorded. The themes must not only be taken separately, but are also interdependent. Progress, in terms of high commitment and involvement in the company’s development, is associated with a consistent line of action within management and key personnel over a long time period, and covering a large part of the theme areas. On the other hand, a single significant departure from such a line may give rise to negative effects very rapidly. The situation within the companies is very complex. Their history needs to be acknowledged, as does the impact of current events in the external environment, as well as the challenges anticipated in the future. The market, the customers, the owners, the technological system and the organization’s social structure are all in constant change. Accordingly, one of the important factors for success lies in the way in which management are able to minimize harmful disturbances, and handle external events in a way that is acceptable for the organization. All in all, commitment and sustainable change requires a reasonable degree of stability of aim and of direction.
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| 6. |
- Mydosh, J. A., et al.
(author)
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Colloquium: Hidden order, superconductivity, and magnetism : The unsolved case of URu(2)Si(2)
- 2011
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In: Reviews of Modern Physics. - 0034-6861 .- 1539-0756. ; 83:4, s. 1301-1322
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Journal article (peer-reviewed)abstract
- This Colloquium reviews the 25 year quest to understand the continuous (second-order), mean-field-like phase transition occurring at 17.5 K in URu(2)Si(2). About ten years ago, the term "hidden order'' (HO) was coined and has since been utilized to describe the unknown ordered state, whose origin cannot be disclosed by conventional solid-state probes, such as x rays, neutrons, or muons. The HO is able to support superconductivity at lower temperatures (T(c) approximate to 1: 5 K), and when magnetism is developed with increasing pressure both the HO and the superconductivity are destroyed. Other ways of probing the HO are via Rh doping and large magnetic fields. During the last few years a variety of advanced techniques have been tested to probe the HO state and these attempts will be summarized. A digest of recent theoretical developments is also included. It is the objective of this Colloquium to shed additional light on the HO state and its associated phases in other materials.
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| 7. |
- Mydosh, J. A., et al.
(author)
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Hidden order and beyond : an experimental-theoretical overview of the multifaceted behavior of URu2Si2
- 2020
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In: Journal of Physics. - 0953-8984 .- 1361-648X. ; 32:14
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Research review (peer-reviewed)abstract
- This topical review describes the multitude of unconventional behaviors in the hidden order, heavy fermion, antiferromagnetic and superconducting phases of the intermetallic compound URu2Si2 when tuned with pressure, magnetic field, and substitutions for all three elements. Such 'perturbations' result in a variety of new phases beyond the mysterious hidden order that are only now being slowly understood through a series of state-of-the-science experimentation, along with an array of novel theoretical approaches. Despite all these efforts spanning more than 30 years, hidden order (HO) remains puzzling and non-clarified, and the search continues in 2019 into a fourth decade for its final resolution. Here we attempt to update the present situation of URu2Si2 importing the latest experimental results and theoretical proposals. First, let us consider the pristine compound as a function of temperature and report the recent measurements and models relating to its heavy Fermi liquid crossover, its HO and superconductivity (SC). Recent experiments and theories are surmized that address four-fold symmetry breaking (or nematicity), Isingness and unconventional excitation modes. Second, we review the pressure dependence of URu2Si2 and its transformation to antiferromagnetic long-range order. Next we confront the dramatic high magnetic-field phases requiring fields above 40 T. And finally, we attempt to answer how does random substitutions of other 5f elements for U, and 3d, 4d, and 5d elements for Ru, and even P for Si affect and transform the HO. Commensurately, recent theoretical models are summarized and then related to the intriguing experimental behavior.
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| 9. |
- Hedberg, Gunnel
(author)
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Screening av miljögifter i Emån 2004-2006
- 2008
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Reports (other academic/artistic)abstract
- I vår omvärld förekommer ett mycket stort antal kemiska ämnen i allt från vanliga konsumentartiklar till läkemedel eller industrikemikalier. Kännedomen om vilka av alla dessa ämnen som kommer ut i vår miljö är starkt begränsad. Kunskapsunderlaget byggs dock gradvis upp genom att ett urval av ämnen mäts i landsomfattande undersökningar så kallad screening. Syftet med screening är att få en uppfattning om vilka halter av kemiska ämnen som vi kan hitta i miljön samt i vilken mån människor riskerar att exponeras för dessa ämnen. Miljöövervakningen av miljögifter behövs också för att följa upp miljömålet ”Giftfri miljö”. Val av ämnen som ska ingå i screeningen görs av Naturvårdsverket. Motivet för att inkludera ett ämne i screeningprogrammet är till exempel att det används i stor omfattning, att det prioriteras i olika internationella sammanhang eller att det uppmärksammas av andra orsaker nationellt. Av de ämnen som screenas nationellt väljer sedan länsstyrelsen i Jönköping och Kalmar län tillsammans med Emåförbundet ut relevanta ämnen som screenas inom Emåns avrinningsområde. Screeningen i Emåns avrinningsområde har under 2004 – 2006 samfinansierats av Emåförbundet och länsstyrelserna i Jönköpings och Kalmar län. Screeningen åren 2004 till 2006 har totalt omfattat 87 ämnen. Av dessa har 43 stycken påträffats i Emåns avrinningsområde, mestadels i mycket låga halter men över detektionsgränsen för respektive metod. 39 av dessa ämnen är organiska miljögifter som inte förekommer naturligt i miljön medan resterande fyra är metaller vilka förekommer naturligt i låga halter men där förhöjda halter troligen beror på föroreningar. De ämnen som idag kan detekteras men förekommer i låga halter utgör inget omedelbart hot men bör följas upp inom en 10-årsperiod.Endast sju ämnen har uppmätts i så höga halter i Emåns avrinningsområde att de snarast bör undersökas ytterligare (orange och rödmarkerade i tabell 1-1 till 1-4); Nonylfenol i områden med verkstadsindustri, tennorganiska föreningar i avloppsreningsverk, PCB i Emån nedre del samt läkemedelsrester i vissa typer av slam från avloppsreningsverk.Alla ämnen och resultat presenteras i sin helhet i bilagorna 2 till 8. I de sammanfattande tabellerna 1-1 till 1-4 samt i kapitel 3 till 9 har endast de ämnen som detekterats tagits med.
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| 10. |
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