Endre søk
Begrens søket
3456789 251 - 300 of 18147
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 251.
    Aghaali, Habib
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik.
    Ångström, Hans-Erik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik.
    Temperature Estimation of Turbocharger Working Fluids and Walls under Different Engine Loads and Heat Transfer Conditions2013Inngår i: SAE Technical Papers, 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Turbocharger performance maps, which are used in engine simulations, are usually measured on a gas-stand where the temperatures distributions on the turbocharger walls are entirely different from that under real engine operation. This should be taken into account in the simulation of a turbocharged engine. Dissimilar wall temperatures of turbochargers give different air temperature after the compressor and different exhaust gas temperature after the turbine at a same load point. The efficiencies are consequently affected. This can lead to deviations between the simulated and measured outlet temperatures of the turbocharger turbine and compressor. This deviation is larger during a transient load step because the temperatures of turbocharger walls change slowly due to the thermal inertia. Therefore, it is important to predict the temperatures of turbocharger walls and the outlet temperatures of the turbocharger working fluids in a turbocharged engine simulation.

    In the work described in this paper, a water-oil-cooled turbocharger was extensively instrumented with several thermocouples on reachable walls. The turbocharger was installed on a 2-liter gasoline engine that was run under different loads and different heat transfer conditions on the turbocharger by using insulators, an extra cooling fan, radiation shields and water-cooling settings. The turbine inlet temperature varied between 550 and 850 °C at different engine loads.

    The results of this study show that the temperatures of turbocharger walls are predictable from the experiment. They are dependent on the load point and the heat transfer condition of the turbocharger. The heat transfer condition of an on-engine turbocharger could be defined by the turbine inlet temperature, ambient temperature, oil heat flux, water heat flux and the velocity of the air around the turbocharger. Thus, defining the heat transfer condition and rotational speed of the turbocharger provides temperatures predictions of the turbocharger walls and the working fluids. This prediction enables increased precision in engine simulation for future work in transient operation.

  • 252.
    Aghaali, Habib
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).
    Ångström, Hans-Erik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).
    The Exhaust Energy Utilization of a Turbocompound Engine Combined with Divided Exhaust Period2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    To decrease the influence of the increased exhaust pressure of a turbocompound engine, a new architecture is developed by combining the turbocompound engine with divided exhaust period (DEP). The aim of this study is to utilize the earlier stage (blowdown) of the exhaust stroke in the turbine(s) and let the later stage (scavenging) of the exhaust stroke bypass the turbine(s). To decouple the blowdown phase from the scavenging phase, the exhaust flow is divided between two different exhaust manifolds with different valve timing. A variable valve train system is assumed to enable optimization at different load points. The fuel-saving potential of this architecture have been theoretically investigated by examining different parameters such as turbine flow capacity, blowdown valve timing and scavenging valve timing. Many combinations of these parameters are considered in the optimization of the engine for different engine loads and speeds.

    This architecture produces less negative pumping work for the same engine load point due to lower exhaust back pressure; however, the exhaust mass flow into the turbine(s) is decreased. Therefore, there is a compromise between the turbine energy recovery and the pumping work. According to this study, this combination shows fuel-saving potential in low engine speeds and limitations at high engine speeds. This is mainly due to the choked flow in the exhaust valves because this approach is using only one of the two exhaust valves at a time. To reveal the full potential of this approach, increasing the effective flow area of the valves should be studied.

  • 253.
    Aghaali, Habib
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik.
    Ångström, Hans-Erik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik.
    Turbocharged SI-Engine Simulation with Cold and Hot-Measured Turbocharger Performance Maps2012Inngår i: Proceedings of ASME Turbo Expo 2012, Vol 5, ASME Press, 2012, s. 671-679Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Heat transfer within the turbocharger is an issue in engine simulation based on zero and one-dimensional gas dynamics. Turbocharged engine simulation is often done without taking into account the heat transfer in the turbocharger. In the simulation, using multipliers is the common way of adjusting turbocharger speed and parameters downstream of the compressor and upstream of the turbine. However, they do not represent the physical reality. The multipliers change the maps and need often to be different for different load points. The aim of this paper is to simulate a turbocharged engine and also consider heat transfer in the turbocharger. To be able to consider heat transfer in the turbine and compressor, heat is transferred from the turbine volute and into the compressor scroll. Additionally, the engine simulation was done by using two different turbocharger performance maps of a turbocharger measured under cold and hot conditions. The turbine inlet temperatures were 100 and 600°C, respectively. The turbocharged engine experiment was performed on a water-oil-cooled turbocharger (closed waste-gate), which was installed on a 2-liter gasoline direct-injected engine with variable valve timing, for different load points of the engine. In the work described in this paper, the difference between cold and hot-measured turbocharger performance maps is discussed and the quantified heat transfers from the turbine and to/from the compressor are interpreted and related to the maps.

  • 254.
    Aghaali, Habib
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).
    Ångström, Hans-Erik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).
    Serrano, Jose R
    Universitat Politècnica de València.
    Evaluation of different heat transfer conditions on an automotive turbocharger2014Inngår i: International Journal of Engine Research, ISSN 1468-0874, E-ISSN 2041-3149, Vol. 16, nr 2, s. 137-151Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a combination of theoretical and experimental investigations for determining the main heat fluxes within a turbocharger. These investigations consider several engine speeds and loads as well as different methods of conduction, convection, and radiation heat transfer on the turbocharger. A one-dimensional heat transfer model of the turbocharger has been developed in combination with simulation of a turbocharged engine that includes the heat transfer of the turbocharger. Both the heat transfer model and the simulation were validated against experimental measurements. Various methods were compared for calculating heat transfer from the external surfaces of the turbocharger, and one new method was suggested.

    The effects of different heat transfer conditions were studied on the heat fluxes of the turbocharger using experimental techniques. The different heat transfer conditions on the turbocharger created dissimilar temperature gradients across the turbocharger. The results show that changing the convection heat transfer condition around the turbocharger affects the heat fluxes more noticeably than changing the radiation and conduction heat transfer conditions. Moreover, the internal heat transfers from the turbine to the bearing housing and from the bearing housing to the compressor are significant, but there is an order of magnitude difference between these heat transfer rates.

  • 255.
    Aghasi, Keivan
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Predicting who stays or leaves after the acquisition:: Target’s top manager turnover2015Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    In acquisition of high-tech and knowledge intensive firms, scholars have paid special attention to top managers’ status after the deal. Literature suggests that these managers in particular CEOs if kept in post-acquisition provide coordination capacity for the acquirer to transfer the knowledge and technology from the target to the acquirer while minimizing the disruptive effect of post-acquisition integration process. In addition, the acquirer benefits from human capital embedded in target’s managerial resources; especially in high-tech and knowledge intensive firms where top managers are founders or patent holders. Although the above mentioned argument have been validated by empirical studies showing that top manager’s turnover reduces the post-acquisition performance for the acquirers, multiple empirical studies have reported abnormal managerial turnover shortly after the acquisition. This thesis made an attempt to explain this puzzling phenomenon by investigating on the determinants of the top manager’s turnover of the target in the post-acquisition period. The study finds that in case of CEOs, acquirers do not rely always on coordinating capacity provided by them in post-acquisition. Indeed, the acquirer’s choice of provision of coordination is beyond the target’s CEO retention. The choice of coordination depends on the existing level of coordination capacities and the acquisition’s motivation. In addition, founder-CEOs are more likely to stay after the acquisition because of their valuable firm-specific human capital for the acquirer. However, this value diminishes by the maturity of the target. In addition, similarity in demographic characteristics of the two CEOs (of the acquirer and target) causes social attraction, collaboration and cooperation which ultimately increases the chance that the target’s CEO retention. Finally, diversity within the target’s top management team (TMT) directly increases their chance of departure after the deal. The diversity engenders social frictions, conflicts and coordination inefficiencies.

  • 256.
    Aghasi, Keivan
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Similarity as an antecedentfor target’s CEO turnover: Do birds of a feather flocktogether?Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    This paper investigates on behavioral aspects of managerial turnover in post-acquisition period. In particular, the paper aims to determine to what extent demographic similarity between CEOs improves their (intergroup) relations which ultimately causes target’s CEO retention in post-acquisition. The paper found that similarity in demographic characteristics of CEOs increases the probability of announcing the retention of target’s CEO after the deal is closed. Additionally, similarity increases the probability of misjudgment in determining target’s CEO status in post-acquisition period. Finally, the paper found that experience as the acquirer’s capability reduces the effect of similarity. This results is based on acquisition of small high-tech firms between 2001 and 2005.

  • 257.
    Aghasi, Keivan
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Brown, Terrence
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Rossi-Lamastra, Cristina
    Department of Management, Economics and Industrial Engineering, Politecnico di Milano.
    The role of top managers in M&A: Reviewing thirty years of literature and setting directions for future researchManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    The present paper reviews the literature on the role of top management teams (TMT) in mergers and acquisitions (M&A). Given variety of theoretical lenses applied in this field - such as agency theory or upper echelon – and the plethora of on-going empirical studies in the last three decades, we believe this literature review has a crucial value for the existing strand of studies and future studies to come. In particular, it systematizes the extant knowledge by documenting the contradictory results of prior empirical studies, making argument on the sources of these contradictions, and pointing out future directions of research.

  • 258.
    Aghasi, Keivan
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Colombo, Massimo
    Department of Management, Economics and Industrial Engineering, Politecnico di Milano.
    Rossi-Lamastra, Cristina
    Department of Management, Economics and Industrial Engineering, Politecnico di Milano.
    Antecedents of target CEO departure in post-acquisitions: The leading role of founderManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    This study investigates on firm specific human capital of target CEOs in small high-tech firms as the antecedent of their retention after the acquisition. The main finding of the paper is that acquirers are willing to keep the founder-CEOs because of their valuable embedded human capital. This value is to the extent that founder-CEOs compare to professional CEOs have a higher chance of retention when relatedness between acquirer and target is high or when the acquirer structurally integrates the target after the acquisition; the two conditions that general managerial skills and industry specific skills of the CEOs are not of interest for the acquirers. Also the value of firm specific human capital depends on the maturity of the target. The value diminishes as the target is more mature at the time of acquisition. This research is based on empirical analysis of acquisition of small high-tech firms between 2001 and 2005.

  • 259.
    Aghasi, Keivan
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Colombo, Massimo
    Department of Management, Economics and Industrial Engineering, Politecnico di Milano.
    Rossi-Lamastra, Cristina
    Department of Management, Economics and Industrial Engineering, Politecnico di Milano.
    Post-acquisition implementation of small high-tech firms: Looking beyond the surfaceManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    In post-acquisition, the main challenge for the acquirer is choosing the right coordination mechanism with respect to the required level of coordination and associated costs of implementation of the mechanism. In acquisition of small high-tech firms, the challenge is exacerbated as technology and knowledge transfer requires high level of coordination while the costs related such as loss of autonomy and organizational disruptions are also higher. In this paper, we showed that acquirer’s choice of coordination mechanisms is determined by the cost-benefit trade-off. In particular, we found that, component technology as a form of task interdependency necessitates higher level of coordination and justifies choosing mechanisms to provide high level of coordination at higher cost. On the contrary, technological relatedness and prior alliance between acquirer and target provide coordination capacity, which in turn reduce the benefits of choosing mechanisms to provide high level of coordination with respect to the associated costs. This study is based on empirical analysis of 403 acquisitions of small high-tech firms between 2001 and 2005. 

  • 260.
    Aghasi, Keivan
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Lougui, Monia
    Broström, Anders
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Colombo, Massimo
    Department of Management, Economics and Industrial Engineering, Politecnico di Milano.
    Why diverse top managementteams break up in post-acquisition periodsManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    This paper proposes a complementary explanation behind the turnover of target’s top managers in post-acquisition periods. Although human capital and acquisition implementation literature describe managerial retention as desirable, empirical studies have reported significant managerial turnover in acquisition of high-tech and knowledge intensive firms. Borrowing some insights from the team diversity literature, the paper examines the ex-ante diversity among top managers of knowledge-intensive and high-tech firms as an antecedent of their turnover in post-acquisition. We argue that diversity reduces the coordination efficiency necessary to transfer knowledge and facilitate post-acquisition organizational integration, and managers belonging to such teams are more likely to be replaced. Empirical analysis drawing on 2164 top managers in 297 Swedish firms shows that managerial position diversity as a separation, pay disparity and industrial tenure diversity as a variety indeed are associated with managerial exit in three years after the acquisition.

  • 261.
    Aghasi, Keivan
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Nationalekonomi. Politecnico di Milano.
    Lougui, Monia
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Nationalekonomi.
    Broström, Anders
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Nationalekonomi.
    Colombo, Massiomo
    Why Diverse Top Management Teams Break up in Post-acquisition Periods2015Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    This paper proposes a complementary explanation behind the turnover of target’s top managers in post-acquisition periods. Although human capital and acquisition implementation literature describe managerial retention as desirable, empirical studies have reported significant managerial turnover in acquisition of high-tech and knowledge intensive firms. Borrowing some insights from the team diversity literature, the paper examines the ex-ante diversity among top managers of knowledge-intensive and high-tech firms as an antecedent of their turnover in post-acquisition. We argue that diversity reduces the coordination efficiency necessary to transfer knowledge and facilitate post-acquisition organizational integration, and managers belonging to such teams are more likely to be replaced. Empirical analysis drawing on 2164 top managers in 297 Swedish firms shows that managerial position diversity as a separation, pay disparity and industrial tenure diversity as a variety indeed are associated with managerial exit in three years after the acquisition.

  • 262.
    Aghasibeig, Maniya
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Fredriksson, Hasse
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Laser cladding of a featureless iron-based alloy2012Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 209, s. 32-37Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Laser cladding experiments with powder injection technique were carried out to create coatings of Fe-8.1Cr6.4Mn-5.3Si-6.9Mo-3.6C alloy on AISI 1018 steel substrates using a diode laser. Analysis of the clad layers showed that an almost featureless structure was formed at different dilutions between 1% and 4%. The featureless phase with a high hardness of 1155 HV was characterized as a metastable solid solution of e phase. However, the featureless structure appeared to be very brittle with numerous cracks. After heat-treatment, it decomposed into a bainitic structure with a high hardness of 884 HV.

  • 263.
    AGORAS, DIMITRIS
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Industriell Marknadsföring och Entreprenörskap.
    Building Information Modeling (BIM) Adoption Barriers: An Architectural Perspective2018Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Building Information Modeling (BIM) is the latest development in the Architecture, Engineering and Construction (AEC) Industry. This development can be used for planning, design, construction, operation and maintenance of any facility. The majority of the users of BIM technology are architects. Although its benefits had been highlighted and underlined especially in comparison with older developments such us Computer Aided Design (CAD) tools, its implementation is considered still in an early stage due to low adoption from architects.

    Right now in Sweden and more specifically in the Stockholm area, the construction sector is booming due to the increased demand for housing.  Thus, there is an increased demand for more houses in a shorter time.

    BIM is a technology that can enhance the society in terms of design and construction with regard to the building environment. This can be achieved by avoiding human errors, decreasing project costs, increasing the productivity and quality, and reducing the project delivery time. Moreover, BIM can assist the management team in maintaining and operating different facilities.

    The focus of this research is on the barriers to adopting BIM technology in architectural companies. Furthermore, the attempt will be to investigate the individual, organizational and technical aspects that affect BIM adoption.  This study will implement a qualitative research method by in-depth interviewing four professionals in the area of architectural design.

    This investigation will be driven by the main research question, which is: What are the barriers to adopting Building Information Modeling (BIM) in architectural companies?

  • 264.
    Agostini Fantini, Francesco
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Izaguirre Carbonell, Javier
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    GIS-Based approach to estimate the energy requirements of the post-harvest activities in Souss-Massa basin in Morocco2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Over the last decades the Moroccan agriculture has passed through a complete transformation: due to the low workforce cost and its favourable climate, the sector has attracted the attentions of national and foreign investment and thus has expanded rapidly. Among the different productions, tomatoes proved to be one of the most profitable, generating 4.867 billion dirhams in 2016 from exports. In order to remain competitive and attractive, the sector needs to be constantly monitored and controlled: abuses of the environment and of available resources may affect or even compromise the future of the Moroccan agriculture. Energy in particular has a remarkable role and has to be analysed in order to quantify its impact over costs and environment. The aim of this study is to build a GIS-based model of tomato’s postharvest system and study the agriculture and energy nexus interactions in the Souss-Massa region. Post harvesting activities such as: Transportation, conditioning, packaging, storing and transformation of tomato, occurs within Souss-Massa’s geographical boundaries and have been the focus of in this study. Results of current system highlight the dominance of packaging activity as the main energy consumer with 77%, followed by storing, transportation and transformation with 14 %, 6% and 3% respectively. In terms of cost the transportation becomes the most relevant activity due to the cost of fuels and transport conditions. Energy costs and wastes in transportation represent 15% of the local revenues (9% Transportation, 5% Packaging and 1% Storing). Four different scenarios about the future situation have been implemented to measure the possible impact of changes in the different activities: Business as Usual (BAU), Transport Efficiency (TE), Waste Reduction (WR) and Renewable Penetration (RP). -3- In BAU current trends have been followed to forecast the total production, the export and the power generation. In TE trucks with bigger capacity have been implemented and in WR refrigeration is considered in every transport stage. Finally, in RP higher renewable penetration has been considered

  • 265.
    Agrawal, Rohit
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Semi-Automated Formalization and Verification of Automotive Requirements using Simulink Design Verifier2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The complexity of embedded software in the automotive domain is ever-increasing due to increase in the no. of features aimed at providing more advanced solutions. This has greatly favored the incorporation of Model Based Design workflow in the software development lifecycle to handle complexities in different development phases. Simulation based testing is widely used in automotive domain to identify design errors in models. However, formal verification as opposed to simulation based testing has an inherent advantage of traversing the entire design space systematically and proving mathematically that the system satisfies the requirements. Lack of knowledge in formal methods and system requirements in their present form in natural text, form the biggest hindrances in making formal verification a reality in the automotive domain. Specification Patterns through their constrained English grammar have shown some promise in requirements specification by avoiding the diverse language structure of the natural language. Simulink Design Verifier (SLDV), a verification tool integrated with MATLAB/Simulink alleviates the need of a separate formal model and leverages on Simulink’s capability to model requirements. This thesis investigates various challenges with regard to formal verification with Simulink Design Verifier and Specification Patterns with possibilities of semi-automating the process. Fuel Level Display System, a case study from Scania is specifically dealt with as a real industry example, to investigate the expressivity of Simulink Design Verifier for modelling requirements, its efficiency as a verification tool, usability of Specification Patterns and insufficiencies of requirements in natural text. The investigation recommends formal verification to be carried out by system engineers/developers with help of Specification Patterns and SLDV, provided that complex behavior is specified within a proposition/non-literal term of Pattern. This complex behavior can be modelled with Simulink and SLDV blocks. The modelling framework of patterns in SLDV can be used to verify the requirements. The limitations posed by SLDV in modelling some aspects of requirements can be dealt with by making suitable changes to system model by system developers.

  • 266.
    Agrell, Fredrik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Control of HCCI by aid of Variable Valve Timings with Specialization in Usage of a Non-Linear Quasi-Static Compensation2006Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This doctoral thesis is about controlling the combustion timing of the combustion concept Homogeneous Charge Compression Ignition, HCCI, by means of variable valve timings.

    The HCCI research usually is regarded to have started in Japan during the later part of the 1970´s. The world of HCCI has since grown and HCCI is of today researched worldwide. Of particular interest from a Swedish point of view is that Lund Institute of Technology has emerged as one of the world leading HCCI laboratories.

    The idea with HCCI is to combine the Otto and Diesel engine. As in an Otto engine the charge is premixed but as in a Diesel engine the operation is unthrottled and the compression heat causes the ignition. The combustion that follows the ignition takes place homogeneously and overall lean. The result is ultra low NOx and particulate emissions combined with high total efficiency. A difficulty with the HCCI-concept is that it only works in a narrow area and that there is no direct way to control the Start Of Combustion, SOC. Out of this follows that timing/phasing of the combustion is one of the main difficulties with HCCI combustion concepts. This is particularly emphasized during transient operation and calls for feedback control of the combustion timing.

    This work investigates one method, the variable valve timing, to achieve feedback control of the combustion phasing. From the work it can be concluded that the variable valve timing can control the combustion phasing during engine transients. In order to improve the performance a non-linear compensation from ignition delay to valve timings has been suggested, incorporated in a control structure and tested in engine test. The engine test has been performed in a single cylinder engine based on a Scania truck engine. The speed range from 500 to 1750 rpm and the load range 1.26 and 10.5 bar of netIMEP has been covered with fair transient performance.

  • 267.
    Agrell, Fredrik
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Ångström, Hans-Erik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Eriksson, Bengt
    Wikander, Jan
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Linderyd, Johan
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Control of HCCI During Engine Transients by aid of Variable Valve Timings Through the use of Model Based Non-Linear Compensation2005Inngår i: SAE transactions, ISSN 0096-736X, Vol. 114, nr 3, s. 296-310Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One of the main challenges with the Homogeneous Charge Compression Ignition, HCCI, combustion system is to control the Start Of Combustion, SOC, for varying load and external conditions. A method to achieve this on a cycle-by-cycle basis is to vary the valve timing based on a feedback signal from the SOC of previous cycles. The control can be achieved with two basic valve-timing strategies named the Overlap- and the IVC-method. The Overlap-method works by trapping of residuals while the IVC-method affects the effective compression ratio. In an earlier paper it has been shown that if the two methods are incorporated into one controller, SOC can be controlled in a relatively large operating window although the transient performance was not sufficient. The reason is that the simple PI-controller cannot be made fast enough to cope with the transients without magnifying the cycle-to-cycle variations of the combustion into instability. In this work a model based control system that features a non-linear compensation, based on the inverse of the non-linear function from valve timings to ignition delay, is suggested and evaluated. The results show good transient performance. Control performance from engine tests is reported. A combined engine and control simulation system is used for the development of the control strategies. The simulations are accomplished with a commercial cycle simulation code linked with a commercial control simulation code. The simulations are iteratively verified against engine test data. Engine tests are conducted on a single cylinder engine equipped with a hydraulic valve system.

  • 268.
    Agrell, Fredrik
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Ångström, Hans-Erik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Eriksson, Bengt
    Wikander, Jan
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Linderyd, Johan
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Practical Modeling of HCCI for Combustion Timing Control and Results from Engine Test2005Inngår i: KTH Internal Combustion Engine Report MFM, Vol. 162Artikkel, forskningsoversikt (Fagfellevurdert)
  • 269.
    Agrell, Fredrik
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Ångström, Hans-Erik
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Eriksson, Bengt
    Wikander, Jan
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Linderyd, Johan
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Transient Control of HCCI Combustion by aid of Variable Valve Timing Through the use of a Engine State Corrected CA50-Controller Combined with an In-Cylinder State Estimator Estimating Lambda2005Konferansepaper (Fagfellevurdert)
    Abstract [en]

    One of the main challenges with the Homogeneous Charge Compression Ignition, HCCI, combustion system is to control the Start Of Combustion, SOC, for varying load and external conditions. A method to achieve this on a cycle-by-cycle basis is to vary the valve timing based on a feedback signal from the SOC of previous cycles. The control can be achieved with two basic valve-timing strategies named the Overlap- and the IVC-method. The Overlap-method works by trapping of residuals while the IVC-method affects the effective compression ratio

  • 270.
    Agrogiannis, Serafim
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    Agrogiannis, Christos
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    A Critical Review and Evaluation of the Lean Concept and Corporate Social Responsibility/Sustainability: Investigating Their Interrelation and Contribution in Terms of Business Competitive Positioning2015Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
  • 271.
    Aguilar, Jorge
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Viktorsson, Morgan
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Development of an active suspension control strategy for a forestry machine with pendulum arms2014Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The forest industry depends on the cut to lenght method for production. The forwarder

    is one of the machines used in this process. These machines currently have

    no suspension, which leads to big problems such as lower productivity and higher

    soil damage.

    A relatively new approach to solve these problems is to use pendulum arms

    actuated by hydraulic cylinders. This solution turns out to be complex, since there

    are more actuators than variables controlled. This paper discusses several strategies

    to control such a system in order to minimize pitch and roll, while decoupling from

    vertical accelerations.

    A solution based on a nonlinear car model is suggested, and an implementation

    based on this model and using a pole placement technique is developed and compared

    in simulink with the same model with no suspension.

    Results show that this strategy is able to reduce pitch and roll considerably,

    while offering the possibility of adding a vertical displacement controller with little

    coupling between each other. The next steps towards implementation are to integrate

    the dynamics of the actuator, to consider robustness and noise interference, as well

    as the effects of discretization.

  • 272.
    AGUZ, JOSEF
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    MARKIEWICZ, OSSIAN
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    Exploring the Relationship Between HousingPrices and Stock Prices2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This study investigates the long- and short-run relationship between stock- and housingprices in Finland, Denmark, Norway and Sweden between 1987-2017 and 1995-2017 with data from OECD statistics. By using interest rate as a control variable and Johansen's Test for Cointegration, the results show a significant relationship for Finland during the period 1995-2017. The short-run analysis implies a credit effect, which is inline with previous studies. However, in Denmark, Norway and Sweden the analysis show no sign of cointegration. A possible explanation for the insignificant results could be the high degree of policy implementations and changes to market structures in the early 1990s, which theoretically could be controlled for by including additional control variables in the analysis.

  • 273.
    Ahangar Zonouzi, S.
    et al.
    University of Tabriz, P.O. Box 51666-16471, Tabriz, Iran.
    Khodabandeh, Rahmatollah
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Safarzadeh, H.
    University of Tabriz, P.O. Box 51666-16471, Tabriz, Iran.
    Aminfar, H.
    University of Tabriz, P.O. Box 51666-16471, Tabriz, Iran.
    Mohammadpourfard, M.
    University of Tabriz, P.O. Box 51666-16471, Tabriz, Iran.
    Ghanbarpour, Morteza
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Experimental study of the subcooled flow boiling heat transfer of magnetic nanofluid in a vertical tube under magnetic field2019Inngår i: Journal of Thermal Analysis and CalorimetryArtikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study, the subcooled boiling heat transfer of a Fe3O4/water magnetic nanofluid flowing through a vertical tube has been investigated experimentally in the presence and absence of a magnetic field. The magnetic field has been generated by quadrupole magnets. The subcooled boiling heat transfer coefficient and the boiling curves of the ferrofluid flow under the action of the magnetic field have been compared with those in the absence of magnetic field. The results showed that magnetic actuation contributes to have higher heat fluxes at the same wall superheat in comparison with heat fluxes achieved in the no magnetic field case. Therefore, the local subcooled boiling heat transfer coefficients are increased by the magnetic field. The maximum measured enhancement in local subcooled boiling heat transfer coefficient along the length of the tube by applying magnetic field is 46.58% at applied heat flux of 77,000 W m−2 and mass flux of 270 kg m−2 s−1. Furthermore, the enhancement of local heat transfer coefficient by applying magnetic field decreases as the applied heat flux in the subcooled boiling region is increased.

  • 274. Ahangar Zonouzi, S.
    et al.
    Khodabandeh, Rahmatollah
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Safarzadeh, H.
    Aminfar, H.
    Trushkina, Y.
    Mohammadpourfard, M.
    Ghanbarpour, Morteza
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Salazar Alvarez, G.
    Experimental investigation of the flow and heat transfer of magnetic nanofluid in a vertical tube in the presence of magnetic quadrupole field2018Inngår i: Experimental Thermal and Fluid Science, ISSN 0894-1777, E-ISSN 1879-2286, Vol. 91, s. 155-165Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, the effects of applying magnetic field on hydrodynamics and heat transfer of Fe3O4/water magnetic nanofluid flowing inside a vertical tube have been studied experimentally. The applied magnetic field was resulted from quadrupole magnets located at different axial positions along the tube length. The variations of the local heat transfer coefficient and also the pressure drop of the ferrofluid flow along the length of the tube by applying the magnetic quadrupole field have been investigated for different Reynolds numbers. The obtained experimental results show maximum enhancements of 23.4%, 37.9% and 48.9% in the local heat transfer coefficient for the magnetic nanofluid with 2 vol% Fe3O4 in the presence of the quadrupole magnets located at three different axial installation positions for the Reynolds number of 580 and the relative increase in total pressure drop by applying the magnetic field is about 1% for Re = 580. The increase of the heat transfer coefficient is due to the radial magnetic force toward the heated wall generated by magnetic quadrupole field acting over the ferrofluid flowing inside the tube so that the velocity of the ferrofluid in the vicinity of the heated wall is increased. It is also observed that the enhancement of heat transfer coefficient by applying magnetic quadrupole is decreased with increasing the Reynolds number.

  • 275.
    Ahari, Parviz
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    A living systems analysis of student design projects at the Royal Institute of Technology (KTH)2006Inngår i: Systems research and behavioral science, ISSN 1092-7026, E-ISSN 1099-1743, Vol. 23, nr 3, s. 419-428Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Student evaluations of courses are routinely obtained by questionnaire in higher education. That student feedback is used for, among other purposes, the planning of future courses. Whether such questionnaires consider, in specific situations, all aspects of the educational processes, or even the important ones, is an open question. This study examines that question with reference to a particular engineering design course. It investigates how groups of students process information in their design projects. The study uses the breakthrough, or full-spectrum, thinking explained by Nadler, Hibino, with Farrell to understand the uniqueness of the situation and to clarify the purposes of the research. Living systems theory instructs the design of research instruments and of a research hypothesis. The results show that significant differences in information processing exist between lower performing and higher performing groups.

  • 276.
    Ahl, Amanda
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Eklund, Johanna
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    A Study of the Potential and Energy Balance of the Emergency Energy Module in Mozambique2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This study investigates the potential for implementation of a solar PV-biodiesel hybrid system with battery storage in two rural villages in the Cabo Delgado province in Mozambique. These villages, Nicuita and Quirimize, have at present very limited access to electricity which greatly inhibits an increase in living standards and development of the respective communities.

     

    Based on the results of conducted surveys mapping potential electricity demand, the load profiles of the villages alongside an investigation of the availability of different resources are the input of the model of this study with which appropriate dimensions of the hybrid system are suggested for each village.

     

    The targeted biofuel of the solar PV-biodiesel hybrid parallel configuration suggested in this study is jatropha based biodiesel for both Nicuita and Quirimize. The biodiesel fueled diesel generator and battery storage meets the nighttime load of the villages, while the solar PV system meets the load during daylight hours and also charges the battery bank to supply the nighttime load not covered by the diesel generator. The electricity production of the hybrid system is distributed through a mini-grid.

  • 277.
    Ahl, Amanda
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Eklund, Johanna
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Success Factor of Woody Biomass Supply Chains in Japan2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    There is an abundance of forest in Japan, yet a lack of utilization of woody biomass in energy systems. Small-scale woody biomass can enable a supply chain based on domestic forest integrated with local industry and demands, in turn facilitating local vitalization. Successful creation of collective energy systems is strongly connected to supply chain design based on local conditions and stakeholder integration. A supply chain perspective is key in enabling woody biomass energy systems. In these supply chains lies a complex stakeholder network across different industries, in turn incurring a need to understand both formal factors, such as technology, and informal factors, such as social relations and culture across these industries.The purpose of this study is to investigate the main challenges, success factors and convergence or divergence of perceptions of key stakeholders across the supply chain of small-scale woody biomass energy systems in Japan. In this study, the concept of small-scale woody biomass involves a supply chain based on domestic forest and integrated with local supply and demand. If the challenges and success factors, as well as balance of perceptions, can be highlighted and managed, small-scale woody biomass can be enabled by incorporating a system’s approach in supply chain analysis. This study employs a methodology incorporating literature studies and semi-structured interviews with experts to create an initial “pentagon model” presenting hypothesized success factors, including both formal and informal elements divided into five categories: technology, structure, social relations & network, culture and interaction. This is a base for the case studies, involving in-depth, semi-structured interviews with four key stakeholders in the woody biomass energy system supply chain, exploring their perceived challenges and success factors. The case studies are carried in Kyushu, the southernmost of the Japanese main islands, known for an abundance of forest alongside activity in the field of woody biomass.The main success factors emphasized by one or more of the interviewed case study stakeholders are respect of values & traditions, transportation infrastructure, business model integration, relationship & trust, local vitalization and biomass quality control. Interesting findings related to the relative success factor perceptions include the high emphasis in the upstream supply chain on respect & traditions of the forest industry, and lack of emphasis downstream. Moreover, biomass quality control is more discussed by the downstream supply chain as a main success factor. The success factors and balance of perceptions found in this study indicate the importance of both informal and formal elements in supply chain success, as well as managing a potential imbalance of perceptions. This study is meant to serve as a base for further studies on factors of the woody biomass energy system supply chain, and promote a system’s approach incorporating both formal and informal aspects in this research.

  • 278.
    Ahl, Amanda
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Eklund, Johanna
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Lundqvist, Per
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Yarime, M.
    Balancing formal and informal success factors perceived by supply chain stakeholders: A study of woody biomass energy systems in Japan2018Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 175, s. 50-59Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Small-scale woody biomass energy systems have an inherent ability to aid in emissions reduction while stimulating local economies and, as collective energy systems, are strongly connected to supply chain design based on local conditions and stakeholder integration. Despite an abundance of forest area alongside the promotion of biomass in energy policies, however, woody biomass utilization still remains low in Japan. The woody biomass supply chain, considered as a socio-technical system, involves a complex, cross-sectoral stakeholder network in which inter-organizational dynamics necessitates well-organized management based on an understanding of formal factors such as technology, as well as informal factors such as social relations and culture. In this paper, success factor perceptions from across the woody biomass supply chain are investigated based on semi-structured interviews with four stakeholders in the Kyushu region of Japan. Identified success factors here are: 1) respect of values & traditions, 2) transportation infrastructure, 3) business model integration, 4) relationship & trust, 5) local vitalization and 6) biomass quality control. A convergence as well as divergence of perceptions are observed, involving both formal and informal dimensions. Aiming to balance perceptions and to enable long-term success of woody biomass in Japan, a series of policy implications are drawn, including cross-ministerial integration, knowledge building on wood logistics, forest certification, local coordinators, biomass quality control standards and a feed-in-tariff for heat. This paper suggests a new arena of policy-making based on the importance of considering both informal and formal dimensions in energy policy.

  • 279. Ahlberg, Beth Maina
    et al.
    Maina, Faith
    Kubai, Anne
    Khamasi, Wanjiku
    Ekman, Marianne
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Organisation och ledning.
    Lundqvist-Persson, Cristina
    "A child, a tree": Challenges in building collaborative relations in a community research project in a Kenyan context2016Inngår i: Action Research, ISSN 1476-7503, E-ISSN 1741-2617, Vol. 14, nr 3, s. 257-275Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper highlights the potential for basing participatory action research on priorities identified by communities. The case builds on a research project by the Social Science Medicine Africa Network (Soma-net) focusing on AIDS prevention among school youth in Kajiado in Kenya during 2003-2006. It became clear from that study just how complex it is to promote open communication on issues of sexuality considered critical for sexual health promotion. Towards the end of that study a spin-off in the form of a concept a child, a tree or tree planting evolved and the research thereafter continued as a partnership between the school community and the researchers. The focus then was on understanding how health promotion could be integrated into other aspects of community life. The concept and tree planting when implemented created a sense of ownership among the pupils largely because they were placed at the centre of the development activities. The story illuminates the nature of change developing in the course of the project, but also the challenges and complexity of creating and maintaining collaborative relations in the face of cultural and gender power dynamics and interventions imposed from outside the community.

  • 280.
    Ahlberg, Victor
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Lärande.
    Frid, Julia
    KTH, Skolan för industriell teknik och management (ITM), Lärande.
    Automation and Autonomy: Developing and Evaluating Open Learning Material on IR Cameras in Automation Applications2019Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    This master thesis project was based on the development and evaluation of an open learning material in thermal imaging for automation applications. The outsourcer – FLIR Systems – wanted a three-day course covering all necessary topics for infrared cameras in automation applications. These topics include thermography, optics, detectors, networks, protocols, and more. The open learning material was designed to function as a three-day, self-paced, distance course, and it was based on theories of andragogy, self-directed learning and transformative learning. The master thesis process was essentially divided into two phases: the development phase and the evaluation phase. The method for the development phase was based on a literature study. The literature on creating open learning material included ways of compensating for the lack of social interaction in distance courses, such as a friendly, warm narrator using the pronoun “I”, encouraging phrases, and self-assessment questions (SAQs). An SAQ is a framing of question intended to guide the learner towards self-assessment of his or her learning and knowledge. The vital part of the SAQ is the response, where not only the correct answer is given, but feedback on the wrong choices too. The development of the open learning material was an iterative process where discussion with supervisors at FLIR Systems and KTH Royal Institute of Technology led to improvements of the material.

    The evaluation phase consisted of two tests with test subjects. The first test was conducted by sending a sample unit of the material to test subjects around the world along with a questionnaire. The main objective was to test the tone and style of the material. There were variations in the result, but the majority found the material friendly and readable. The second test was an in-house test with three participants. Three sample units of the material was used, and the main objective was to test the usability of the material and the test subjects’ perceived learning process. The usability of the material varied with the three test subjects and depended on their technological prerequisites and reading comprehension in English. All test subjects responded positively to their perceived learning outcome.

    The following conclusions were drawn: the open learning material has the potential to promote autonomous and self-directed learners and can be used as a basis for further development – such as web-based courses and teacher-led classes.

    The open learning material as a whole and the results and analysis from the tests are included as appendices.

  • 281.
    Ahlbäck, Anton
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. KTH.
    Study of the optimization of the electromagnetic field configuration for electromagnetic brakes for thin slab casting with different casting throughput using CFD simulations.2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In steelmaking, the quest for increased productivity without losing quality is never-ending, and new processes and changes to existing ones are constantly explored. In the 20th century, electromagnetic devices were introduced to the steel industry, in order to increase productivity in various parts of the steelmaking process. One of these devices is called an Electromagnetic Brake, or EMBR, and is applied at the mold of the continuous caster. The EMBR generates an electromagnetic field that affects the flow of the steel, and this paper has investigated how different electromagnetic fields affect the steel flow. The project has been performed in collaboration with ABB and the aim have been to investigateif it is possible to optimize the braking effect by altering the EMBR iron core of an existing EMBR, thus generating electromagnetic fields of new geometrical characters. This was done at a casting throughput of 4,5 metric ton/min. Furthermore, it was also investigated how the modified EMBRs affected a steel flow of a higher casting throughput of 8,0 metric ton/min. The investigations have been performed by conducting CFD simulations; however, no industrial experiments have been performed in order to validate the CFD results. It was found that it is possible to achieve more optimized braking by changing the geometry of the electromagnetic field and it was possible to brake the meniscus velocity below the critical value of 0,3 m/s. It was also found that with increased throughput an electromagnetic field of greater magnetic flux density was needed to have a braking effect. However, the meniscus velocity when casting with a throughput of 8,0 metric ton/min never reached below the critical value of 0,3 m/s. The electromagnetic field that had the most damping effect on the meniscus velocity of the lower throughput was also the field that had the highest damping effect on the higher throughput.

    Fulltekst tilgjengelig fra 2044-12-24 09:10
  • 282.
    AHLFVENGREN, ELLINOR
    et al.
    KTH, Skolan för industriell teknik och management (ITM).
    Blomqvist, Louise
    KTH, Skolan för industriell teknik och management (ITM).
    The effect of M&A activity on firms R&D intensity - A quantitative study on the Swedish biotechnological industry2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
  • 283.
    Ahlgren, Hedvig
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Landström, Moa
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Success within Front End of Innovation- Recommendations for enabling creation anddevelopment of ideas at Atlas Copco,Construction Tools2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Several researchers talk about how the greatest source of competitive advantage is a firm's capability to be innovative, and it is a fact that economic growth is built upon innovations and ideas. Ideas belong to the early activities of innovation processes, which can be defined as he front end of innovation (FEI). FEI has clearly been stated to be crucial for the innovative performance of firms, but yet an area which many companies often lack of handling in a structured way.

    What need to be considered for a successful FEI has laid the foundation of this thesis. The aim with the thesis is to investigate what are key success factors and common pitfalls for processes and activities within the FEI, and how these can be handled by management. The thesis is also investigating how ideas and innovations can be measured in order to take the right decisions for different types of ideas by a suitable level of decision-makers. The thesis was carried out as a case study at Construction Tools division at Atlas Copco who had expressed the same demand as many companies appear to struggle with: a structured FEI. The goal with the thesis is therefore to propose recommendations towards a successful FEI, including structures, methods, and tools for the case company. In order to do so, twelve semistructured qualitative interviews with internal employees followed by ten semi-structured qualitative interviews with external companies in different industries and sizes were conducted. Along with the case study, a literature study was also performed.

    The collected data were analyzed and benchmarked towards the literature and the research questions, which resulted in several conclusions which are both general as well as organizational specific for the case company. These are amongst others: a structured innovation portfolio management including clear budget allocation and innovation strategy; enabling a creative culture; separating staff for conducting work regarding disruptive ideas; involvement by top management in the development of ideas.

  • 284.
    AHLGREN, LINNEA
    et al.
    KTH, Skolan för industriell teknik och management (ITM).
    AHLSTRAND, REBECCA
    KTH, Skolan för industriell teknik och management (ITM).
    Co-creation as a Market Entry Strategy Key areas to consider when entering a market by co-creating digital HR-tools2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
  • 285.
    Ahlgren, Linnea
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Industriell Marknadsföring och Entreprenörskap.
    Rebecca, Ahlstrand
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Industriell Marknadsföring och Entreprenörskap.
    Co-creation as a Market Entry Strategy: Key areas to consider when entering a market by co-creating digital HR-tools2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Due to digitalization, companies face a wide range of opportunities and challenges when it comes to attracting, recruiting and retaining talents. To meet these, companies need to present and achieve originality regarding values and corporate culture. One possible solution to this may be customized Human Resource tools.  Co-creation is an increasingly common product development strategy to create customized tools. It is based on collaboration and joint production of value between a supplier and customer. Cocreation may be a favorable strategy for early stage companies to gain customers and enter the market. While there are a variety of market entry strategies, this study is based on the insufficient attention among these to the customer as a possible collaborator when entering. This lack of attention is noteworthy since theory shows that the customer is gaining increased power over a supplier’s business decisions, largely due to digitalization.  There is a need to introduce a strategy that defines how companies co-create with their customers and regards them as an allied. This close relationship provides mutual benefits, sustainable relationships and networks. Consequently, this study aims to investigate if a co-creation strategy can be used to enter a market for an early stage company. The study is based on inductive reasoning and qualitative research methods. It uses semi- structured interviews, active participating observations and a literature study to collect primary and secondary data. The study proposes that co-creation is a new type of market entry strategy and suggests three key areas to consider for an early stage company when entering. These areas are: development approach, ownership and product protection, and expectation and communication.

  • 286.
    AHLGREN, OSKAR
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    SPICE UP APQP2013Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
  • 287.
    Ahlin, Björn
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Gärdin, Marcus
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Automated Classification of Steel Samples: An investigation using Convolutional Neural Networks2017Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Automated image recognition software has earlier been used for various analyses in the steel making industry. In this study, the possibility to apply such software to classify Scanning Electron Microscope (SEM) images of two steel samples was investigated. The two steel samples were of the same steel grade but with the difference that they had been treated with calcium for a different length of time. 

    To enable automated image recognition, a Convolutional Neural Network (CNN) was built. The construction of the software was performed with open source code provided by Keras Documentation, thus ensuring an easily reproducible program. The network was trained, validated and tested, first for non-binarized images and then with binarized images. Binarized images were used to ensure that the network's prediction only considers the inclusion information and not the substrate.

    The non-binarized images gave a classification accuracy of 99.99 %. For the binarized images, the classification accuracy obtained was 67.9%.  The results show that it is possible to classify steel samples using CNNs. One interesting aspect of the success in classifying steel samples is that further studies on CNNs could enable automated classification of inclusions. 

  • 288.
    Ahlin, Björn T. I.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Nitrogen Removal in a Vacuum Tank Degasser: An Investigation on the Nitrogen Removal Performance2019Independent thesis Advanced level (degree of Master (Two Years)), 300 hpOppgave
    Abstract [en]

    The impending change of processes at SSAB Oxelösund due to the HYBRIT project, where the blast furnace and LD converter are to be replaced with an EAF will have a significant impact on the manufacturing of steel in Oxelösund. One issue that will arise is the nitrogen content in the steel. Sources claim that the nitrogen content in steel from an EAF route is substantially larger, 60-70 ppm, than in steel from a blast furnace and LD converter route, which have a nitrogen content of around 25 ppm. Therefore, the nitrogen removal capabilities of SSAB Oxelösund’s vacuum tank degasser were to be examined. Industrial trials were performed where the amount of slag during vacuum treatment was lowered. The intention was that half the amount of slag removed prior to vacuum treatment and later completely slag free. This was performed in an attempt to increase the effective reaction area, where nitrogen removal occurs. Due to some practical problems with the steel mill, the industrial trial were unfortunately cut short. Consequently, only trials with half the amount of slag were performed and compared to existing process data for standard praxis. Also, nitrogen removal calculations based on the industrial data were performed. A parameter representing the overall reaction rate, which is dependent on effective reaction area was obtained, validated and subsequently applied to a future case scenario. The results indicate that the reduction in slag amount does have the desired effect, increasing the said area and increasing the rate of nitrogen removal. However, the sample size is not nearly sufficient enough to determine this definitively. The conclusions reached were that the facility does have the possibility to decrease the increased nitrogen content down to reasonable levels, around 20-30 ppm. Albeit, an increase in vacuum treatment time is probably required. Another conclusion was that surface active elements, such as oxygen and sulphur greatly reduce the nitrogen removal. Therefore, efforts should be taken to remove these elements prior to vacuum treatment. In addition, it was established that the effective reaction area is of great importance for a successful nitrogen removal. Therefore, actions to maximise this area should be taken. Finally, it was stated that further research is necessary in order to fully understand nitrogen contamination prevention- and removal techniques

  • 289.
    Ahlin, Christian
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    Att skapa interna varumärken: En studie kring varumärkesteoriernas roll i interna intiativ2008Independent thesis Advanced level (degree of Master (Two Years)), 300 hpOppgave
    Abstract [sv]

    Organisationers komplexitet och vikten av effektiv intern kommunikation växer med storleken och därmed är det dags att undersöka ifall mer avancerad marknadsföring även är relevant för internt bruk. Därför har användningen av varumärkesteorier i intern marknadsföring av interna initiativ studeras i syfte att försöka förstå deras roll. För att öka förståelsen så har en fallstudie genomförts vilket resulterat i en perspektivsmatris med möjligheten att påvisa en dualitet gällande motivationen bakom skapandet av varumärken för interna initiativ inom en organisation. De förutsättningar för internt varumärkesskapande som framkommer är (digital och/eller skriven) kommunikation, (någon form av) konkurrens, (initiativets) kontinuitet, maktskillnad (med annan beslutsfattare än ägare av initiativet) och möjligheter (för extern användning). Detta framställs tillsammans med råd gällande användningen av varumärkesteorier, det vill säga varumärkesskapande via associationsbyggande, för interna initiativ. Kvalitativa data samlades in under 2008 hos företaget.

  • 290.
    AHLIN HÖGFELDT, SIMON
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Mekatronik.
    SÖDERMAN, DANIEL
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Mekatronik.
    Human controlled robotic arm: Improving usability with haptic feedback2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    In our modern society, the usage of robotic arms are increasing. Much of the

    work in the industry is now done by robots. Even though they are able to do

    very precise work, difficulties appear when trying to do some of the tasks that

    humans do. This can be changed by making it easy for a human to control the

    robotic arm and to "teach it" how it’s done.

    The purpose of this project is to develop a robotic arm that is easily controlled

    by the user. This is done by using the users own arm movement to

    control the robot. To make the usage more intuitive, a simple haptic feedback

    system will be implemented. This creates a greater experience where the user

    is able to "feel what the robot feels". To be able to create such a system,

    development of an easy control unit, robotic arm and feedback system has to

    be made. The steering of the robotic arm is created from reading the user’s

    arm movement with potentiometers, and mapping these values to servos on

    the robotic arm. Sensors on the robotic claw and on the user’s hand makes it

    possible for a DC motor to create a counter torque that gives a feel for the size

    of the object being lifted.

    The feedback system seemed to improve the overall experience of using a

    robotic arm and with further work, today’s robotic industry could be improved.

  • 291.
    Ahlin, Lina
    et al.
    Lund Univ, CIRCLE, Lund, Sweden.;Lund Univ, Dept Econ, Lund, Sweden..
    Andersson, Martin
    Lund Univ, CIRCLE, Lund, Sweden.;Lund Univ, Dept Econ, Lund, Sweden.;Blekinge Inst Technol BTH, Dept Ind Econ, SE-37179 Karlskrona, Sweden.;Res Inst Ind Econ IFN, Stockholm, Sweden.;Swedish Entrepreneurship Forum, Stockholm, Sweden..
    Thulin, Per
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.). Swedish Entrepreneurship Forum, Stockholm, Sweden.
    Human capital sorting: The "when" and "who" of the sorting of educated workers to urban regions2018Inngår i: Journal of regional science, ISSN 0022-4146, E-ISSN 1467-9787, Vol. 58, nr 3, s. 581-610Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The sorting of high-ability workers is often advanced as one source of spatial disparities in economic outcomes. There are still few papers that analyze when human capital sorting occurs and whom it involves. Using data on 16 cohorts of university graduates in Sweden, we demonstrate significant sorting to urban regions on high school grades and education levels of parents, i.e., two attributes typically associated with latent abilities that are valued in the labor market. A large part of this sorting has already occurred in deciding where to study, because the top universities in Sweden are predominantly located in urban regions. The largest part of directed sorting on ability indicators occurs in the decision of where to study. Even after controlling for sorting prior to labor market entry, the best and brightest are still more likely to start working in urban regions. However, this effect appears to be driven by Sweden's main metropolitan region, Stockholm. We find no influence of our ability indicators on the probability of starting to work in urban regions after graduation when Stockholm is excluded. Studies of human capital sorting need to account for selection processes to and from universities, because neglecting mobility prior to labor market entry is likely to lead to an underestimation of the extent of the sorting to urban regions.

  • 292. Ahlin, Lina
    et al.
    Andersson, Martin
    Thulin, Per
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation. Swedish Entrepreneurship Forum, Sweden.
    Market Thickness and the Early Labour Market Career of University Graduates: An Urban Advantage?2014Inngår i: Spatial Economic Analysis, ISSN 1742-1772, E-ISSN 1742-1780, Vol. 9, nr 4, s. 396-419Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We analyse the influence of market thickness for skills on initial wages and the early job market career of university graduates. Using Swedish micro-level panel data on a cohort of graduates, we show that two out of three graduates move to large cities upon graduation. Large cities increase employment probabilities and yield higher rewards to human capital, even after controlling for employment selection. The premium on initial wages for graduates in urban regions is in the interval of 5-6%, and we estimate a wage-growth premium of about 2-4%. Thicker markets for skills appear as a key reason for the concentration of graduates to larger cities.

  • 293.
    Ahlin Wigardt, Oliver
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Deep Green, en jämförande analys2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Marin energi har stor potential att på ett relativt miljövänligt sätt utvinna energi ur bl.a. vind, vågor och strömmar. Prototyper och kraftverk för att skörda energi ur tidvattenströmmar har de senaste 10 åren blivit mer populärt, inte minst för att uppnå de miljökraven som ställts internationellt. Minesto är ett företag som utvecklar ett tidvattenkraftverk som heter Deep Green, som har ett väldigt unikt utförande, och har analyserats och jämförts mot två andra relevanta konkurrerande tidvattenkraftverk, DeltaStream och Seagen S. Studien har fokuserats på de vanligaste utförandena och variation vad gäller transmission, fundament, installation, strategi för att utföra underhåll och reparationer, reglering och elnätsanslutningar, för att sedan på ett mer strukturerat sätt förklara och beskriva de tre kraftverken.

    Deep Green är en så kallad tidvattensdrake. Tidvattensdraken består av en vinge med gondol och turbin som är monterad i havsbotten med ett tjuder. När tidvattnet förs över vingen börjar Deep Green att färdas framåt, på grund av den lyftkraft som bildas över vingen, i en bana formad som en åtta. Kraftverket uppnår sin märkeffekt på 0,5MW vid tidvattenströmmar på 1,4 m/s.

    DeltaStream och Seagen S är båda tidvattenkraftverk med horisontal axiala monterade turbiner, dvs. samma princip som vindkraftverk men tillämpad under vatten. DeltaStream och Seagen S producerar vid märkeffekt 1,2MW respektive 1,2MW - 2,0MW vid strömhastighet på 3,1 m/s respektive 2,5 m/s.

    Den jämförande analysen påvisar att Deep Green har störst potential och var bäst på 8 av 18 punkter. Analysen sammanställdes och rangordnades genom poängen 1-3, med avseende på egenskaper i förhållande till varandra då kraftverket med bäst egenskap under en rad fick 3 poäng och den minst bra får 1 poäng. Saknas uppgift ges ett poäng och likadana/liknande egenskaper ger 2 eller 1 poäng beroende på egenskap. Denna sammanställning gav Deep Green 42 poäng, Seagen S 36 poäng och DeltaStream 34 poäng.

  • 294.
    Ahlinder, Kristina
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Development of a Folding Boat Anchor2013Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report is the result from a Master of Science Thesis work at the Royal Institute of Technology, and is executed by technology student Kristina Ahlinder for the behalf of Design Company Top Notch Design AB. Top Notch Design wants to expand their range of marine products and look in to the market of boat anchors. The aim of the project is to develop an anchor for small leisure boats for the Swedish market with focus on usability and safety. A detailed informational study was executed at the beginning of the project. To collect information regarding how potential users experience current anchors on the market, a user test and a digital questionnaire was done. Through the questionnaire, the user test, requirements from the company and the informational study a criteria specification was made. Some of the criteria were that it should be an easy to stow day anchor designed for leisure boats up to 27 feet and have a maximal weight of 8 kg. Other important criteria were good usability and innovative and interesting design. The ideation stage of the project was mainly based upon brainstorming sessions. 11 concepts were sketched and prototyped in paper and wood. Ten of the concepts were manufactured in small-scale and welded together in steel, in order to evaluate the functionality. The anchors were dragged in a sandbox, and the drag-force was measured with a nanometer. The anchor that performed best in the drag test was a kind of foldable plow anchor. This is the concept that was chosen to be developed.The anchor was further developed and tested before being modeled in the CAD-program SolidWorks. The final design consists of a fluke and a shaft connected by a joint, and a handle for usability, ease of recovery and for getting it in the right angle on the seafloor. The anchor has an automatic locking mechanism in the joint, and rubber details. The anchor’s material is mainly aluminum and weighs 3.8 kilos and has a length of 48 centimeters.The anchor fulfills the criteria specification and most of the preferences and according to calculations the joint will hold for forces higher than 2000 N. The anchor will, according to calculations, have an approximate selling price of slightly over 500 SEK. According to feedback given by potential users, 40 % has a good impression of the anchor and 26 % could imagine buying it. The outcome is a new and innovation type of anchor that suits the modern small-boat owner. The anchor has to be tested in full scale with the correct materials to fully be evaluated. The anchor would contribute to the conservative marine market. The anchor would be a brave and interesting addition to the current anchor market, as well as to TND’s current marine products. 

  • 295.
    Ahlinder, Kristina
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Dahlkvist, Jessica
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Bidragande konceptarbete inför lanseringen av den optiska sensorn RailEye för bekämpning av spårhalka2011Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Detta examensarbete är ett vidareutvecklingsarbete av RailEye, ett rälsöga som har möjlighet att, med hjälp av optik, läsa av var på tågrälsen det är halt. Problemet grundar sig i den spårhalka som bildas då fukt och överkörda löv får samverka under kyliga temperaturförhållanden vilket gör det svårt att manövrera tågen. Rälsögat har utvecklats genom ett samarbete mellan Stockholms Lokaltrafik (SL) och Kungliga Tekniska Högskolan (KTH), och var i examensarbetets upptakt i ett behov av vidareutveckling. Rälsögat har en fullbordad funktion, men kräver en genomgående analys och plan för att den skall fungera i praktiken. Inför arbetet har det genomförts litteraturstudier, intervjuer samt tester med rälsögat. Arbetet har resulterat i ett framtagande av en monteringslösning för rälsögat till Roslagsbanan. En kravspecifikation för detta ändamål konstruerades. Även en plan för hur rälsögats signalsystem skall fungera har tagits fram med hjälp av undersökning av Roslagsbanans samt andra trafikeringsföretags signalsystem. Monteringslösningen består av en kubliknande behållare för rälsögat, med en öppning för optiken. Behållaren spänns fast med hjälp av ett fixerande hölje som i sin tur är uppspänt på bromsenheten på Roslagsbanans motor- och manövervagn. Laborationsundersökningar visade bland annat att de former som testades på öppningen, som skall utgå från rälsögats optik, inte påverkade dess signalmätning. När rälsögat är monterat på tåget krävs det, för att signalmätningen skall vara så pålitlig som möjligt, att mjukvaran använder information från både rälsöga och väderstationer. Telematiknätet TETRA (Terrestrial Trunked Radio) kan användas för att överföra information mellan rälsöga, förare, kontrollcentral samt de väderstationer som skall finnas utplacerade längs rälsen. Med hjälp av vetskapen om halkan i förtid har föraren möjlighet att anpassa hastigheten och förseningar kan undvikas. Monteringslösningen som är framtagen uppfyller kravspecifikationen på ett godtagbart vis, både vad gäller krav och önskemål. Det krävs dock fortfarande ytterligare arbete innan rälsögat kan presenteras som ett färdigt koncept för intressenter.

  • 296.
    AHLINDER, LUDVIG
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Industriell Management.
    LINDAHL, CARL
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Industriell Management.
    Areas of complexity in a reverse merger: An exploratory study regarding the complexity of theintegration process in a reverse merger2014Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Mergers and acquisitions are common business practices and a large amount of studies point to the complexity of these endeavors and the difficulty of executing them successfully. Different kinds of mergers and acquisitions exist and one of the most uncommon forms is referred to as the reverse merger.

    The reverse merger is unusual in the sense that the acquiring company conforms to the ways and culture of the target company. Being such a rare event, little previous research regarding the reverse merger, and specifically the integration process of such an acquisition, exist. As a result, further enquiry was deemed necessary, which is why the purpose of this study is to explore said integration and identify areas of complexity in this process.

    In order to identify areas of complexity, the authors conducted a case study at a company who recently had partaken in an acquisition intended to be a reverse merger. The majority of the data was collected through in depth interviews on site as well as participatory observations.

    The findings in this study indicate three different areas of complexity: lack of cultural awareness, lack of planning as well as lack of communication. These three areas are intertwined and it is suggested that they are accounted for when pursuing a reverse merger. In addition, the findings of this study can be used as a foundation for future research.

     

  • 297.
    Ahlklo, Yrr
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    Lind, Carin
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    E, S or G? A study of ESG score and financial performance2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Sustainability is not a new concept to the financial markets, but its popularity and wider use have increased as people have grown more concerned about the future of this planet. However, the relationship between sustainable investments and financial performance is not clear. One of the most used measures of sustainability is the concept of ESG score, where E, S and G stand for environmental, social and governance. In this study, we investigate the relationship between ESG score and financial performance, both market and accounting based. We also separate the score into its individual parts E, S, and G, and try to distinguish which factor has the strongest relation to financial performance. To evaluate the relationship, a regression analysis was performed on a sample of Nordic stocks and the Sustainalytics ESG rank. Our findings concluded no significant relationship between ESG score and financial performance, neither market nor accounting based. The environmental factor (E) showed the strongest relation to financial performance, however slightly negative and only significant to one dependent variable out of three. Our results indicate that based on the ESG score used in this study, no conclusions can be drawn about financial performance. Since our research does not indicate a significant relationship, our recommendation is to invest in the highest ESG ranked stock in case of choosing between two otherwise similar stocks.

  • 298.
    AHLKLO, YRR
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    LIND, CARIN
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    E, S or G? A study of ESG scoreand financial performance2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Sustainability is not a new concept to the financial markets, but its popularity and wider use have increased as people have grown more concerned about the future of this planet. However, the relationship between sustainable investments and financial performance is not clear. One of the most used measures of sustainability is the concept of ESG score, where E, S and G stand for environmental, social and governance. In this study, we investigate the relationship between ESG score and financial performance, both market and accounting based. We also separate the score into its individual parts E, S, and G, and try to distinguish which factor has the strongest relation to financial performance. To evaluate the relationship, a regression analysis was performed on a sample of Nordic stocks and the Sustainalytics ESG rank. Our findings concluded no significant relationship between ESG score and financial performance, neither market nor accounting based. The environmental factor (E) showed the strongest relation to financial performance, however slightly negative and only significant to one dependent variable out of three. Our results indicate that based on the ESG score used in this study, no conclusions can be drawn about financial performance. Since our research does not indicate a significant relationship, our recommendation is to invest in the highest ESG ranked stock in case of choosing between two otherwise similar stocks.

  • 299.
    Ahlqvist, Niklas
    et al.
    KTH, Skolan för industriell teknik och management (ITM).
    Jungåker, Jonas
    KTH, Skolan för industriell teknik och management (ITM).
    Perrin, Agnes
    KTH, Skolan för industriell teknik och management (ITM).
    Internet of things and automated farming2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The purpose of this project is to make it easier to grow plants domestically all year round. The objective is to construct a remotely controllable and environmentally independent automated hydroponic system. This would minimize the efforts required by the user to sustain plants in non-native climates.

    A hydroponic gardening system uses water as a growth medium instead of soil. The system is climate conscious and has benefits compared to conventional agriculture.

    Hydroponic systems are affected by several factors, this project only focuses on controlling the light intensity by isolating the system, and regulating the nutrient concentration through EC. The system uses a microcontroller for analysis and control.

    The results are promising, showing that the system works. However, the limitations in time led to a short test period, therefore the data gathered is limited. The discussion based on the results conclude that the system cannot be considered completely automatic but reduces the need of manual labour.

  • 300.
    AHLSTRAND, FELICIA
    et al.
    KTH, Skolan för industriell teknik och management (ITM).
    GRANATH, ISABELLE
    KTH, Skolan för industriell teknik och management (ITM).
    Risktagande vid tidiga beslut i produktutvecklingsprocessen: En jämförelse mellan kvinnor och män2018Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Produktutveckling anses vara en riskfylld bransch där det dagligen fattas beslut på begränsad information. Skillnader i individers riskvillighet kan därav vara av stor betydelse för de beslut som fattas. Forskning påvisar skillnader i riskvillighet mellan könen vilket har väckt intresse för att undersöka om skillnaderna framträder i denna riskfyllda bransch. I detta arbete har en studie utförts för att undersöka individens riskhantering vid tidiga beslut i produktutvecklingsprocessen. Studien innefattar även en jämförelse mellan kvinnor och mäns riskvillighet.

    Inledningsvis utfördes en litteraturstudie för grundläggande förståelse om olika teorier som berör risker, dess konsekvenser och genus kopplat till riskhantering. För djupare kunskap inom ämnet kompletterades litteraturstudien med en förstudie. Denna bestod av intervjuer med tre forskare inom riskhantering, projektpsykologi och genus där risker och riskhantering diskuterades utifrån de olika forskningsperspektiven. Vidare utfördes en kvalitativ undersökning bestående av intervjuer med anställda inom produktutvecklingsbranschen. Dessa syftade till att undersöka hur risker definieras inom produktutveckling samt hur individer förhåller sig till riskfyllda beslut. Vidare användes resultatet från den kvalitativa undersökningen för analys mot litteraturen och förstudien samt för att jämföra riskvillighet mellan kvinnor och män.

    Denna studie visade på att risker inom produktutveckling definieras som alla faktorer som kan påverka tid, kostnad och kvalitet i ett projekt. Hur man förhåller sig till dessa risker skiljer sig mellan individer och studien påvisar även att det finns skillnader i riskbenägenhet mellan kvinnor och män.

3456789 251 - 300 of 18147
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf