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  • 51.
    Abbasi, Saeed
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Olofsson, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Tritscher, Trosten
    TSI.
    Krinke, Thomas
    TSI.
    On-board study of nano- and micrometer-particle characteristics of a running electric train2013Konferansepaper (Fagfellevurdert)
  • 52.
    Abbasi, Saeed
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Olofsson, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Zhu, Yi
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Sellgren, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Pin-on-disc study of the effects of railway friction modifiers on airborne wear particles from wheel-rail contact2013Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 60, s. 136-139Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Knowledge of wheel–rail interaction is crucial to wheel and rail maintenance. In this interaction, some of theworn-off material is transformed into airborne particles. Although such wear is well understood, few studiestreat the particles generated. We investigated friction modifiers' effects on airborne particles characteristicsgenerated in wheel-rail contacts in laboratory conditions. Pin-on-disc machine testing with a round-head pinloaded by a dead weight load 40 N simulated maximum contact pressure over 550 MPa. Airborne particlecharacteristics were investigated in dry contacts and in ones lubricated with biodegradable rail grease andwater- and oil-based friction modifiers. The number of particles declined with the grease; the number ofultrafine particles increased with the water-based friction modifier, mainly due to water vaporization.

  • 53.
    Abbasi, Saeed
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Sellgren, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Olofsson, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Particle emission from rail vehicles: A literature review2012Inngår i: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, Sage Publications, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Emission of airborne particles is a side effect from rail transport. This work reviews recent research on particle emissions from rail vehicles. Both exhaust and non-exhaust particle emissions are characterized by size, morphology, composition, and size distribution. Current legislation, knowledge of adverse health effects, and available and proposed solutions for emission reductions are also treated. There has been much focus on exhaust emissions, but only a few limited studies have investigated non-exhaust particle emissions, which contain a significant amount of metallic materials. A new method for measuring the airborne wear particle emission rate (AWPER) is proposed as a first step to guide new legislations and to focus further research on non-exhaust airborne emission, i.e., research on the generation mechanisms for particle emissions and their adverse health effects.

  • 54.
    Abbasi, Saeed
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement. KTH, Skolan för teknikvetenskap (SCI), Centra, Järnvägsgruppen, JVG.
    Sellgren, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Olofsson, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement. KTH, Skolan för teknikvetenskap (SCI), Centra, Järnvägsgruppen, JVG.
    Technical note: Experiences of studying airborne wear particles from road and rail transport2013Inngår i: Aerosol and Air Quality Research, ISSN 1680-8584, Vol. 13, nr 4, s. 1161-1169Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Airborne particles and their adverse effects on air quality have been recognized by humans since ancient times. Current exhaust emission legislations increase the relative contribution of wear particles on the PM levels. Consequently, wearbased particle emissions from rail and road transport have raised concerns as ground transportation is developing quickly. Although scientific research on airborne wear-based particles started in 1909, there is almost no legislation that control the generation of wear-based particles. In addition, there is no accepted and approved standard measurement technique for monitoring and recording particle characteristics. The main objective of this study is to review recent experimental work in this field and to discuss their set-ups, the sampling methods, the results, and their limitations, and to propose measures for reducing these limitations.

  • 55.
    Abbasi, Saeed
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement. Department of Mechanical engineering, Golpayegan University of Technology.
    Teimourimanesh, Shahab
    Chalmers.
    Vernersson, Tore
    Chalmers.
    Sellgren, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Olofsson, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Lunden, Roger
    Chalmers.
    Temperature and Thermoelastic Instability at Tread Braking Using Cast Iron Friction Material2013Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 314, nr 1–2, s. 171-180Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Braking events in railway traffic often induce high frictional heating and thermoelastic instability (TEI) at the interfacing surfaces. In the present paper, two approaches are adopted to analyse the thermomechanical interaction in a pin-on-disc experimental study of railway braking materials. In a first part, the thermal problem is studied to find the heat partitioning between pin and disc motivated by the fact that wear mechanisms can be explained with a better understanding of the prevailing thermal conditions. The numerical model is calibrated using the experimental results. In a second part, the frictionally induced thermoelastic instabilities at the pin-disc contact are studied using a numerical method and comparing them with the phenomena observed in the experiments. The effects of temperature on material properties and on material wear are considered. It is found from the thermal analysis that the pin temperature and the heat flux to the pin increase with increasing disc temperatures up to a transition stage. This agrees with the behaviour found in the experiments. Furthermore, the thermoelastic analysis displays calculated pressure and the temperature distributions at the contact interface that are in agreement with the hot spot behaviour observed in the experiments.

  • 56.
    Abbasi, Saeed
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement. KTH, Skolan för teknikvetenskap (SCI), Centra, Järnvägsgruppen, JVG.
    Teimourimanesh, Shahab
    Chalmers.
    Vernersson, Tore
    Chalmers.
    Sellgren, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Olofsson, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement. KTH, Skolan för teknikvetenskap (SCI), Centra, Järnvägsgruppen, JVG.
    Lunden, Roger
    Chalmers.
    Temperature and thermo-elastic instability of tread braking friction materials2012Konferansepaper (Fagfellevurdert)
  • 57.
    Abbasi, Saeed
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Wahlström, Jens
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    Olander, Lars
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Installationsteknik.
    Larsson, Christina
    Bombardier Transportation Sweden AB, Västerås, Sweden.
    Olofsson, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Tribologi.
    Sellgren, Ulf
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
    A study of airborne wear particles generated from organic railway brake pads and brake discs2011Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 273, nr 1, s. 93-99Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Brake pads on wheel-mounted disc brakes are often used in rail transport due to their good thermal properties and robustness. During braking, both the disc and the pads are worn. This wear process generates particles that may become airborne and thus affect human health. The long term purpose of ‘Airborne particles in Rail transport’ project is to gain knowledge on the wear mechanisms in order to find means of controlling the number and size distribution of airborne particles. In this regard, a series of full-scale field tests and laboratory tests with a pin-on-disc machine have been conducted. The morphology and the matter of particles, along with their size distribution and concentration, have been studied. The validity of results from the pin-on-disc simulation has been verified by the field test results. Results show an ultra-fine peak for particles with a diameter size around 100 nm in diameter, a dominant fine peak for particles with a size of around 350 nm in diameter, and a coarse peak with a size of 3-7 μm in diameter. Materials such as iron, copper, aluminium, chromium, cobalt, antimony, and zinc have been detected in the nano-sized particles.

  • 58.
    ABBASSI, BEHRANG
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Organisation och ledning.
    HULTLING JACOBSEN, JOHANNES
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Organisation och ledning.
    A Managerial Perspective on Uncertainty and Commitment in Organizational Change2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Organizational change has during the last decades become a common practice among corporations in every major market. Change has ironically become a constant, which has put an emphasis on organizations to master the practice of change management. In addition to becoming a more and more relevant practice, change initiatives are hard to carry through with little, or even any, financial success, according to prevalent research. The purpose of this master’s thesis, conducted at The Royal Institute of Technology (KTH) and in collaboration with a large company going through a major organizational change, was investigating the notion of uncertainty and commitment, as well as the relationship between the two, amongst managers within the context of organizational change.

    The thesis, which is a qualitative study, has been based on 14 interviews with mid-level managers at a company, referred to in the thesis as Case Company. Furthermore, the thesis has used prevalent research in order to segment, delimit and analyze the empirical data. The findings have shown that the drivers of commitment; namely understanding; belief and involvement, and the mitigating factors of uncertainty; information sharing and control, do in fact have interlinking causalities. In short, information sharing furthers understanding, which in turn affects the belief in the change initiatives. Moreover, involvement gives employees, managers included, a sense of control, which reduces feelings of uncertainty. The findings have also shown that there exist factors, which are not underlined by prevalent research, that heavily affect the communicating and information sharing processes of change initiatives. These factors are primarily the involvement and power possessed by unions and worker’s councils. The research has also shown that both current theory and practice do not consider the long-term adverse effect of organizational change to the extent we argue that it mandates. These adverse effects are referred to in the thesis, as well as prevalent theor, as survivor’s syndrome, which can be summarized as the residual effects of a change on the members of the organization that remain.

    The thesis has given fruit to possible areas of improvement for Case Company, which  ncludes, among others, the information sharing process and long-term adverse effects of organizational change. Moreover, the thesis has also highlighted potential segmentations and focus areas of future research, which include observing how commitment to the proposed change compared to the commitment to the organization changes as organizational change makes its presence felt.

  • 59.
    Abbassi, Behrang
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Hultling, Johannes
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Smarta Elnät – Modell och Marknad2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The Smart Grid technology has during the last decade been established as a way to create a greater flexibility on the electricity grid that will be needed as the development moves towards an increased share of renewable primary energy sources in the electricity production. One part of the Smart Grid technology is the ability to shift loads in time, to adapt to either price or emissions, known as Demand Response. This project, which was conducted at KTH in collaboration with the consulting corporation Capgemini, examines the economic, environmental and social aspects of the Demand Response technology.

     

    In the project, three household products are used in a model that derives the potential savings in costs and emissions of CO2e. The results show that the actual savings measured in SEK are small, but that the savings measured in percent can be as high as 20 percent. Reduction of CO2e emissions is slightly lower. Furthermore, the study shows that the savings increase as more flexibility is given to the model and as the fluctuations of price increases. A scenario that includes more intermittent electricity production, and end users ready to commit to the technology,  is therefore vital for the success of the Demand Response technology. The results also show that an optimization cannot be done in such way that both minimize costs and CO2e emissions simultaneously.

     

    A discussion on the strategic opportunities for Capgemini shows that focus should be on collecting, interpreting and compiling the large amounts of data that the technology will result in. There are also possibilities in peripheral services tied together with the Smart Grid technology, such as the development of a charging infrastructure for electric cars.

  • 60.
    Abbes, Yacine
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Educational studies in heat and power technology: how students learn with multimedia tools and problem-based learning2005Licentiatavhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    Higher education is undergoing continuous changes and new learning tools and methods are implemented. Researchers in education do not always agree upon the effectiveness of some of the methods introduced into engineering education. The present thesis consists of two case studies on educational methods introduced at the Department of Energy Technology, at Royal Institute of Technology (KTH), Sweden. The qualitative research methodology has been used in case one and a combination of qualitative and quantitative methodology has been used in the second case. The sources of evidences consisted of: unstructured interviews, analysis of video recording, questionnaires, and analysis of a variety of documents. In the first case, an educational program in heat and power technology was analysed. The second case consists in an in-depth study of group dynamics in a Problem –Based Learning course. These studies showed that the learning approach adopted by students depends strongly on the way they view the particular learning tool or method. The first case study revealed the existence of two types of learners. Surfacelearners follow the structure suggested by the designers of the multimedia program. This category of learners focuses only on the material available in the program. Deep-learners go beyond the information and the structure suggested in the program and combine different learning tools in their learning. These students do not follow the structure of the tutorials’ of the multimedia program. This study showed that students who had a strong view how to learn with a multimedia program or a learning method benefited less from the learning tools available. Students with weak views on how to learn from educational program or leaning tool benefit less from the presentation and engage in more surface learning. Self-motivated learners use the multimedia presentation in novel ways and crosscheck the information given with other material. The second study showed that students have unclear and weak views on how to learn with student-directed Problem- Based Learning model. Four types of learners were identified in Problem-Based Learning project: Leaders, Key Actors, Common Students and Social Loafers. Leaders and Key Actors are self-motivated individuals and participate most in the projects. Students who viewed themselves or were viewed as leaders were held responsible to take most of the decisions and students expected them to work more than the average student. Students who viewed themselves as common team members expected a lower workload than leaders’. Key Actors are self-motivated students who do not view themselves as separate from other group members but who participate more than others. Leaders learned more group and social processes, that they did not fully take part in, while common students learned more from the project management aspects that they did not take part in. The study also found that Problem-Based Learning groups can become very cohesive, and can develop distorted views on how to learn with Problem-Based Learning, and un-common group dynamics phenomena such as groupthink can occur in Problem-Based Learning setting.

  • 61.
    Abdallah, Magdy
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Indirect Marketing through Influencers on Social Media: Comparing Faceebok paid advertisement services to advertisement by influencers on social media2015Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Social media platforms are an increasingly popular advertising medium, because ofthe opportunities for targeted advertising they provide, but there are also opportunitiesto pay prominent content generators, known as influencers, to publicize brands.This thesis focuses on a case study with Truecaller, a Swedish mobile applicationcompany, advertising in Egypt through a sarcasm page on Facebook. Sarcasm isa very common trait in the everyday life in Egypt and Truecaller is an establishedbrand in the market. The results show that it is more cost effective to pay the sarcasmpage to joke with the company on Facebook, than paying Facebook to promotethe company’s page. The cost per impression was 27% lower, while the cost per userengagement was 31% lower and the cost per user reached was 5% lower. Overall thecampaign increased the number of average application downloads per day by 30%.

  • 62.
    Abdi, Amir
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Analysis of heat recovery in supermarket refrigeration system using carbon dioxide as refrigerant2014Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The aim of this study is to investigate the heat recovery potential in supermarket refrigeration systems using CO2 as refrigerants. The theoretical control strategy to recover heating demand from refrigeration system is explained thoroughly and the heat recovery process from two existing supermarket using CO2 booster units is analyzed and evaluated. The measured data of refrigeration systems is obtained through Iwmac interface, processed using Excel and Refprop. The aim is to see what control strategy is used in these systems and weather it matches the theoretical one and at what level heat is recovered from the system.

    Besides, a simulation model is made by EES to investigate the potential of higher rate of heat recovery in the supermarkets. The simulation results are compared with field measurement and validated by measured values. Then, the ability of refrigeration system to do heat recovery at quite high rates for covering the total heating demand without using parallel heating system is evaluated and efficiency of the system is calculated. At the next step the heat recovery potential at other refrigeration solutions such as R404A conventional and CO2-ammonia cascade systems are studied and the results are compared to booster units. Finally, the potential for selling heat from the refrigeration system in supermarket to district heating network is investigated. Two different scenarios are made for such purpose and the results are evaluated.

    The heat recovery control strategy of existing supermarkets does not match the theoretical strategy and regarding the capacity of the system, heat is recovered to low extent. Simulation shows that heat can be recovered to higher extent at quite high heating COP of 3-5. Additionally the other heat recovery solutions for R404A conventional and CO2-ammonia cascade systems are found to be competitive to CO2 booster system.  The analysis of selling heat to district heating network shows that CO2 booster system is capable of covering the demand at reasonable heating COP as the first priority and selling the rest to district heating network at heating COP of 2 as second priority.  

  • 63.
    Abdi, Amir
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Martin, Viktoria
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Chiu, Justin NingWei
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Numerical investigation of melting in a cavity with vertically oriented fins2019Inngår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 235, s. 1027-1040Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper investigates the effect of vertical fins, as an enhancement technique, on the heat transfer rate and energy density of a latent heat thermal energy storage system. This contributes with knowledge on the interaction of heat transfer surface with the storage material for optimizing storage capacity (energy) and power (heat transfer rate). For the assessment, numerical modeling is employed to study the melting process in a two-dimensional rectangular cavity. The cavity is considered heated isothermally from the bottom with surface temperatures of 55 degrees C, 60 degrees C or 70 degrees C, while the other surfaces are insulated from the surrounding. Aluminum and lauric acid are considered as fin/enclosure material and phase change material, respectively. Vertical fins attached to the bottom surface are employed to enhance the charging rate, and a parametric study is carried out by varying the fin length and number of fins. Thus, a broad range of data is provided to analyze the influence of fin configurations on contributing natural convection patterns, as well as the effects on melting time, enhanced heat transfer rate and accumulated energy. The results show that in addition to increasing the heat transfer surface area, the installation of vertically oriented fins does not suppress the natural convection mechanism. This is as opposed to horizontal fins which in previous studies have shown tendencies to reduce the impact of natural convection. This paper also highlights how using longer fins offers a higher rate of heat transfer and a better overall heat transfer coefficient rather than increasing the number of fins. Also, fins do not only enhance the heat transfer performance in the corresponding melting time, but also maintain similar total amount of stored energy as compared to the no-fin case. This paper discusses how this is the result of the enhanced heat transfer allowing a larger portion of sensible heat to be recovered. For example, in the case with long fins, the relative mean power enhancement is about 200% with merely 6% capacity reduction, even though the amount of PCM in the cavity has been reduced by 12% as compared to the no-fin case. Although the basis for these results stems from the principles of thermodynamics, this paper is bringing it forward with design consideration. This is because despite its importance for making appropriate comparisons among heat transfer enhancement techniques in latent heat thermal energy storage, it has not been previously discussed in the literature. In the end, the aim is to accomplish robust storage systems in terms of power and energy density.

  • 64.
    Abdi, Amir
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Sawalha, Samer
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Karampour, Mazyar
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
    Heat recovery investigation of a supermarket refrigeration system using carbon dioxide as refrigerant2014Inngår i: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014, International Institute of Refrigeration, 2014, s. 277-285Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This study investigates the heat reclaim of trans-critical CO2-booster refrigeration unit in a supermarket in Sweden. The aim is to compare the control strategy for heat recovery in real supermarket installation to the optimum control strategy.

    The optimum control strategy based on theoretical analysis is explained. By analyzing field measurement of a supermarket, heat recovery in the refrigeration system is studied and compared to the optimum case. To investigate the potential of higher heat recovery rate, a computer model is developed based on the optimum control strategy.  The model is also used to calculate the boundary conditions at which the system should run for highest COP.

    The results show that heat can be recovered at heating COP of 3-4.5. The theoretical analysis shows that the amount of heat that can be recovered from the refrigeration system is about 1.3 times (130 %) the cooling demand in the system. However the analysis of the field measurements shows that only between 30-60 % of the available heat to be recovered is utilized, the rest is released to outdoors. The analysis in this study shows that there is a potential to recover much more heat from the refrigeration system at relatively high heating COP compared to heat pump.

  • 65.
    Abdo, Mohamed
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    Supply chain integration and barcoding: A case study in Medical Device market2017Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
  • 66.
    Abdo, Nawar
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
    Modularization and evaluation of vehicle’s electrical system2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Modularization is a strategy used by many companies, to help them provide their customers with a high variety of customized products efficiently. This is done through the customization of different independent modules, which are connected by standardized interfaces that are shared throughoutthe entire module variety.

    Scania, being one of the large companies that provide modular products, has been successfully improving their modularization concepts for many years, and is one of the most iconic companies when it comes to modularization of buses, trucks and engines. But with the increasing need ofelectronics integrated in the vehicles, it is becoming more and more important to modularize the electrical system.

    There is currently an existing, modularized, product architecture for the electrical system, and Scania wants to know how well modularized it is, as there is no unified way that indicates what is considered to be the better solution.To analyze the current state of the electrical system, a systematic method of modularization was used, which would help answer three important questions: Are the modules well defined? Is there a way to systematically compare alternative solutions? What criteria are more important to focus on?

    Since there is no unified way of modularization, many modularization methods have been created, and each one has been optimized for a certain purpose.

    This project compares three different modularization methods and then uses one of the methods which is deemed to be the preferred method to help provide the answers that the company seeks when investigating the modularity of the electrical system.

    As the electrical system is very complex, and the project has limited amount of resources, it was decided to choose one of the control units as an example, which was the APS (air processing system).

    The literature study showed that the most rewarding method to use was the MFD (Module Function Deployment), as it provides more information about the product and what criteria the company should focus on. It was then decided to use the relevant steps in MFD to analyze the state of the APS as an example of how this method works.

  • 67.
    Abdoli, Shiva
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    A holistic machining line behavior modeling using Finite State Machines2014Independent thesis Advanced level (degree of Master (Two Years)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Energy consumption of turning and milling operations are analyzed in this thesis profoundly. It is aimed to be able to employ analysis results in real production floors. So it is tried to investigate on most effective parameters on machine tool energy consumptions which are changeable in production floors. Due to existing limitations in predesigned manufacturing lines, cutting depth, feed rate and spindle speed, are chosen to analyze their effects on machine tools energy consumption. All other influencing parameters are presumed constant during research. Evaluating machine tools energy consumption shows increasing machining factors values reduces energy consumption in machining operation. Scrutinizing machining factors effect on energy consumption revealed that, increasing one machining factor when two other factors have constant low or constant high values has different effect on energy consumption. The main contribution of this research is proposing a mathematical model, based on material removal rate and machining time for estimating machine tools energy consumption. In addition, a methodology to find machine energy consumption profile based on MRR in a particular operation is proposed too. This enables to find critical breakpoints of MRR for energy consumption in machining operations. Subsidiary effect of increasing Machining factors, on machine energy consumption is analyzed too. To obtain integrative conclusion regarding the effect of machining factors on energy consumption, their influence should be studied in a production system, for long term. In addition machines experience different states with different profile of energy consumption. So energy consumption of machine tools in all states is considered as product associated energy consumption. These targets are achieved by modeling a production line and simulate it for long time. The results indicates for system energy efficiency, it worth’s to increase machining factors even if tool life and consequently machine utilization reduce. Effect of production planning such as batch mode production from energy consumption perspective in production system is evaluated. The results exhibit consistency between tool life, machine idle energy consumption and optimum batch size. The accomplishments can greatly help process planner to achieve optimum production system configuration to enhance energy efficiency.

  • 68.
    Abdoli, Shiva
    et al.
    KTH.
    Semere Tesfamariam, Daniel
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Investigation on Machine Tools Energy Consumptions2014Inngår i: International Journal of Mechanical, Aerospace, Industrial and Mechatronics Engineering, Vol. 8, nr 6, s. 1136-1143Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Several researches have been conducted to study consumption of energy in cutting process. Most of these researches are focusing to measure the consumption and propose consumption reduction methods. In this work, the relation between the cutting parameters and the consumption is investigated in order to establish a generalized energy consumption model that can be used for process and production planning in real production lines. Using the generalized model, the process planning will be carried out by taking into account the energy as a function of the selected process parameters. Similarly, the generalized model can be used in production planning to select the right operational parameters like batch sizes, routing, buffer size, etc. in a production line. The description and derivation of the model as well as a case study are given in this paper to illustrate the applicability and validity of the model.

  • 69.
    Abdollahi, Arsam
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Misstags reducering vid internationell order: En utredande rapport om Eaton Corporation i Hengelo Nederländerna och GE Healthcare i Uppsala Sveriges åtgärder för misstags reducering på Front Office2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Rapporten utreder de speciella karaktärsdragen en kundanpassad produktion har på företagen Eaton Corporation, Hengelo i Nederländerna och Ge Healthcare, Uppsala i Sverige. En djupgående utredning av vad företagen i fråga gör för att reducera misstag vid internationell order. Alltså det som sker från att säljavdelningen får kontakt med kunden till att Projektledare/orderhanterare får beställningen. Fallgroparna vid internationell order som tas upp är t.ex.: kunskapsgap från säljsidan, inga standardiserade dokument för order, skräddarsydda lösningar utan moduler i ERP systemet, ERP system som inte uppdateras systematiskt, kundanpassade produkter, budgeteringsmall beroende på ERP system och vilket land budgetering sker i, restriktioner i ERP systemet, kommunikationsprotokoll mellan berörda avdelningar, integrationen mellan de berörda avdelningarna, kommunikation mellan de berörda avdelningarna och kundens inblandning i projektet. Det som syns genom studien är att företagen är fullt medvetna om att det sker misstag vid Front Office men väljer att inte kvantifiera eller analysera sina misstag. Företagen väljer istället att komma på andra lösningar som att sätta in nya procedurer och protokoll som har syfte att minska misstagen. Fast detta görs utan någon utredning av vad som är källan till misstagen eller vetskap om hur många misstag som görs eller vilka som är de mest kritiska. Som avslutning görs en analys över företagens tillvägagångssätt för att reducera misstagen samt rekommendationer för vad som bör göras ytterligare för att minska misstagen.

  • 70.
    ABDOUSSI, Sarah
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Energisystemanalys.
    Project Finance in the Energy FieldCase Study: A wind Power Project in a Moroccan-like environment2013Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Companies, governments and NGOs are involved in designing and planning the future energy landscape of countries. Engineers and scientists contribute highly to this planning through bringing innovative, efficient and reliable technical solutions. Their know-how is used during the project development, the EPC (Engineering, Procurement and Construction) phase as well as during the Operation and Maintenance stage.

    However, a successful energy plan depends on many other parameters such as the legal side, the political background of the country, the financing methods, the funding, the environmental aspects and the social acceptance.

    This Master Thesis Project focuses on the financing side of energy projects, which is a key point to properly manage competitive and viable projects. The strong link between the financing and the political background will be shortly commented throughout the report.

    In the first part of the report, the focus is put on the Project Finance. All along the report, the theoretical concepts will be illustrated with examples taken from the EDF EN projects, mainly in the Middle East and North African area. The second part deals with the risks associated to power projects. Commercial and political risks are listed and the main mitigation tools are explained. The third part of the report is dedicated to basic business models for energy projects. A simplified economical and financial model is described in detail and run for a wind farm project in a Moroccan-like environment. A sensitivity analysis (fourth part) concludes the report through analyzing: - the impact of technological choices on the internal return on investment will be studied - the impact of the financial parameters on the project structure.

  • 71.
    Abdul Abas, Riad
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Experimental Studies of Thermal Diffusivities concerning some Industrially Important Systems2006Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The main objective of this industrially important work was to gain an increasing understanding of the properties of some industrially important materials such as CMSX-4 nickel base super alloy, 90Ti.6Al.4V alloy, 25Cr:6Ni stainless steel, 0.7% carbon steel, AISI 304 stainless steel-alumina composites, mould powder used in continuous casting of steel as well as coke used in blast furnace with special reference to the thermal diffusivities. The measurements were carried out in a wide temperature range covering solid, liquid, glassy and crystalline states.

    For CMSX-4 alloy, the thermal conductivities were calculated from the experimental thermal diffusivities. Both the diffusivities and conductivities were found to increase with increasing temperature. Microscopic analysis showed the presence of intermetallic phases γ´ such as Ni3Al below 1253 K. In this region, the mean free path of the electrons and phonons is likely to be limited by scattering against lattice defects. Between 1253 K and solidus temperature, these phases dissolved in the alloy adding to the impurities in the matrix, which, in turn, caused a decrease in the thermal diffusivity. This effect was confirmed by annealing the samples at 1573 K. The thermal diffusivities of the annealed samples measured at 1277, 1403 and 1531 K were found to be lower than the thermal diffusivities of non-annealed samples and the values did not show any noticeable change with time. It could be related to the attainment of equilibrium with the completion of the dissolution of γ´ phase during the annealing process. Liquid CMSX-4 does not show any change of thermal diffusivity with temperature. It may be attributed to the decrease of the mean free path being shorter than characteristic distance between two neighbouring atoms.

    Same tendency could be observed in the case of 90Ti.6Al.4V alloy. Since the thermal diffusivity increases with increasing temperature below 1225 K and shows slight decrease or constancy at higher temperature. For 25Cr:6Ni stainless steel, the thermal diffusivity is nearly constant up to about 700 K. Beyond that, there is an increase with temperature both during heating as well as cooling cycle. On the other hand, the slope of the curve increases above 950 K, which can be due to the increase of bcc phase in the structure. 0.7% carbon steel shows a decrease in the thermal diffusivity at temperature below Curie point, where the structure contains bcc+ fcc phases. Above this point the thermal diffusivity increases, where the structure contains only fcc phase. The experimental thermal conductivity values of these alloys show good agreement with the calculated values using Mills model.

    Thermal diffusivity measurements as a function of temperature of sintered AISI 304 stainless steel-alumina composites having various composition, viz, 0.001, 0.01, 0.1, 1, 2, 3, 5, 7, 8 and 10 wt% Al2O3 were carried out in the present work. The thermal diffusivity as well as the thermal conductivity were found to increase with temperature for all composite specimens. The thermal diffusivity/conductivity decreases with increasing weight fraction of alumina in the composites. The experimental results are in good agreement with simple rule of mixture, Eucken equation and developed Ohm´s law model at weight fraction of alumina below 5 wt%. Beyond this, the thermal diffusivity/ conductivity exhibits a high discrepancy probably due to the agglomeration of alumina particles during cold pressing and sintering.

    On the other hand, thermal diffusivities of industrial mould flux having glassy and crystalline states decrease with increasing temperature at lower temperature and are constant at higher temperature except for one glassy sample. The thermal diffusivity is increased with increasing crystallisation degree of mould flux, which is expected from theoretical considerations.

    Analogously, the thermal diffusivity measurements of mould flux do not show any significant change with temperature in liquid state. It is likely to be due to the silicate network being largely broken down.

    In the case of coke, the sample taken from deeper level of the pilot blast furnace is found to have larger thermal diffusivity. This can be correlated to the average crystallite size along the structural c-axis, Lc, which is indicative of the higher degree of graphitisation. This was also confirmed by XRD measurements of the different coke samples. The degree of graphitisation was found to increase with increasing temperature. Further, XRD and heat capacity measurements of coke samples taken from different levels in the shaft of the pilot blast furnace show that the graphitisation of coke was instantaneous between 973 and 1473 K.

  • 72.
    Abdul Abas, Riad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processvetenskap.
    Hayashi, M.iyuki
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processvetenskap.
    Seetharaman, Seshadri
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processvetenskap.
    Thermal Diffusivity measurement of CMSX-4 alloy by Laser flash method2007Inngår i: International journal of thermophysics, ISSN 0195-928X, E-ISSN 1572-9567, Vol. 28, nr 1, s. 109-122Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the present work, thermal diffusivity measurements have been carried out on industrial samples of CMSX-4 nickel-base superalloy using the laser-flash method with emphasis on studying the effect of temperature and microstructure on the thermal diffusivity. The measurements were performed in the temperature range from 298 to 1623 K covering both solid as well as liquid ranges. Below 1253 K, the thermal-diffusivity values were found to increase with increasing temperature. Microstructural investigations of quenched samples revealed that below 1253 K, an ordered phase, usually referred to as the -phase was present together with the disordered fcc phase, often referred to as the γ phase. Between 1253 K and the solidus temperature, the phase was found to dissolve in the matrix alloy causing an increase in the disordering of the alloy, and thereby a small decrease in the thermal-diffusivity values. The thermal-diffusivity values of samples pre-annealed at 1573 K exhibited constancy in the temperature range from 1277 to 1513 K, which is attributed to the attainment of thermodynamic equilibrium. These equilibrium values were found to be lower than the results for samples not subjected to annealing. The thermal-diffusivity values of the alloy in the liquid state were found to be independent of temperature.

  • 73.
    Abdul Abas, Riad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processvetenskap.
    Hayashi, Miyuki
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processvetenskap.
    Seetharaman, Seshadri
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processvetenskap.
    Thermal Diffusivity Measurements of some Industrially Important Alloys by a Laser Flash Method2007Inngår i: International journal of materials reseach, ISSN 1862-5282, Vol. 98, nr 6, s. 535-540Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the present work, thermal diffusivity measurements of three industrially significant alloys, viz. 90Ti.6Al.4V, stainless steel with 25Cr and 6Ni as well as plain carbon steel with 0.7 % carbon have been carried out as a function of temperature. The aim of this work is to study the effect of temperature and microstructure on the thermal diffusivities of these alloys. For the 90Ti.6Al.4V alloy, thermal diffusivity increases with temperature below 1225 K. Above this temperature, the values started decreasing probably due to the dissolution of Ti3Al intermediate phase in the matrix, which would result in an increase in the disorder of the structure. For 25Cr: 6Ni stainless steel, the thermal diffusivity is nearly constant up to about 700 K. Above this, there is an increase in the thermal diffusivities with temperature during the heating cycle, which was reproducible during thermal cycling. On the other hand, the slope of the curve increases above 950 K.

    In the case of the 0.7 % carbon steel, the thermal diffusivity shows a decreasing trend with temperature below the Curie point for the alloy, where the alloy consists of bcc + fcc phases. Above this point, only the fcc phase is prevalent and the thermal diffusivity was found to increase with temperature. Heat transfer is carried out by lattice vibration (phonons) as well as electrons. The contribution of electrons varies depending upon the type of alloy. In this study, the highest electron contribution was found in 0.7 % carbon steel, while the lowest was in stainless steel. The thermal conductivity values of these alloys are in good agreement with the calculated values using the model proposed by Mills.

  • 74.
    Abdul Abas, Riad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jakobsson, Anders
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Hayashi, Miyuki
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Seetharaman, Seshadri
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Studies on Graphitisation of Blast Furnace Coke by X-ray Diffraction Analysis and Thermal Diffusivity Measurements2005Inngår i: Steel research, ISSN 0177-4832, Vol. 77, nr 11, s. 763-769Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    High temperature XRD and thermal diffusivity experiments were employed to investigate the degree of graphitisation in blast furnace coke. The experiments were conducted between room temperature and 1473 K. X-ray diffraction studies were carried out in order to monitor the degree of graphitisation in the coke samples from the same campaign. In these cases, the degree of graphitisation was followed by the changes in the vertical dimension. The degree of graphitisation was found to be dependent on temperature. On the other hand, the graphitisation at each temperature was instantaneous, even at as low a temperature as 973 K and no dependency on time could be noticed. The thermal diffusivities of the coke samples taken from deeper level of the experimental blast furnace were measured using the laser-flash technique. The results from these measurements showed that thermal diffusivities increased with the degree of graphitisation, which in turn, can be affected by the level in the blast furnace at which the coke sample was taken. The present results indicate that the degree of graphitisation as followed by X-ray diffraction analysis as well as thermal diffusivities can be used to trace the thermal history of coke. DSC measurements show that the heat capacity of the coke increases with temperature towards the heat capacity of graphite, which could be due to the increasing the graphitisation degree of the coke.

  • 75.
    Abdul Abas, Riad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Seetharaman, Seshadri
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Thermal Diffusivity of Sintered Stainless steel-Alumina Composite2006Inngår i: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 37, nr 4, s. 513-518Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Thermal diffusivity measurements were carried out as a function of temperature on sintered AISI 304 stainless steel-alumina composites having various compositions (0.001, 0.01, 0, 1, 1, 2, 3, 5, 7, 8, and 10 wt pct Al2O3). The measurements were carried out between room temperature and 1473 K. The thermal diffusivity and the thermal conductivity were found to increase with temperature in all the composite specimens. The thermal diffusivity was found to decrease with increasing weight fraction of alumina. This tendency can clearly be seen at temperatures above 755 K. The experimental results are in good agreement with the simple rule of mixture, the Eucken equation, and the Ohm’s law model developed by Hayashi et al. at weight fractions of alumina below 5 wt pct. Beyond this composition, the thermal diffusivity/conductivity shows a large discrepancy from the models. This could probably be attributed to the accumulation of alumina particles during cooled pressing and sintering.

  • 76.
    Abdul Hussein, Murtada
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    Al-Entabe, Faysal
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    Vattenjet som poleringsmetod2016Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
  • 77.
    Abdulgadir, Imad
    et al.
    KTH, Skolan för industriell teknik och management (ITM).
    Abdulgadir, Adil
    KTH, Skolan för industriell teknik och management (ITM).
    Ernström, Simon
    KTH, Skolan för industriell teknik och management (ITM).
    Cirkulär ekonomi som affärsmodell för svensk biogasproduktion2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Mängden resurser som förbrukas i dagens samhälle har visat sig vara ett problem som dels orsakats av den linjära ekonomin. Modellen har bland annat bidragit till stora prisfluktuationer, brist på naturresurser samt spill i produktionskedjan då inte minst 21 miljoner ton material varje år i OECD-länders tillverkning inte återfinns i slutprodukten. Större uppmärksamhet har konceptet för cirkulär ekonomi fått efter erkännandet att tillgången på resurser är avgörande för ekonomins samt naturens välstånd. Den cirkulära ekonomin bygger på ett kretslopp designat för att utnyttja resurser till dess fullo för att sedan bryta ned materialen, vilket leder till en förbättrad resurseffektivitet samtidigt som en minimering av restprodukter görs. En lämplig affärsmodell för svensk biogasproduktion med en utgångspunkt för den cirkulära ekonomins teorier och modeller skapades genom en SWOT-analys och en affärsmodell Canvas, för att undersöka om den nya modellen kan underlätta omställningen från ett fossilbaserat energisystem. Utöver det genomfördes en omfattande litteraturstudie delvis med fokus på hållbarhet, ekonomin samt modellernas begränsningar. Slutsatsen som kan dras är att cirkulär ekonomi som utgångspunkt för affärsmodellen för svensk biogasproduktion har stor potential till att bidra till, samt påskynda en energiomställning. Studien visar att det största hindret till energiomställningen i dagsläget är att finna potentiella investerare. Slutligen upptäcktes potentiella synergieffekter mellan svenska biogasproduktionen och cirkulär ekonomi vilket tyder på en positiv relation dem emellan.

  • 78.
    ABDUL-JALIL, CARLO
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    BEGLARYAN, SARGIS
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    Ultralätt hopfällbar reflektor2017Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Datapath är ett företag som tillverkar satellit antenner för radio och telekommunikationssystem. Antennerna används inom olika områden, vissa modeller är anpassade för att användas i extrema miljöförhållanden som exempelvis i krigszoner. Gruppen hade fått i uppdrag att utveckla M-modellen som används främst i militära bruk. I dagsläget är de befintliga antennerna tunga och stela vilket innebär att de kräver fordonstransport för längre sträckor och tar stort utrymme under transport. Eftersom projektet skulle genomföras under endast 10 veckor, begränsades arbetet endast till utveckling av reflektorn. Målet var att minska transportvolymen med 20 procent och minska massan med 50 procent. Företaget rekommenderade en paraplyantenn som skulle vara hopfällbar, något som tagits hänsyn till under arbetet. Under arbetet hade gruppen kommit fram till olika koncept med olika material för reflektorn. Resultatet av idegenereringen blev två olika koncept med två olika material. Det första konceptet är tänkt att bestå av CFRS (Carbon Fiber Reinforced Silicone). Materialet är ultralätt samtidigt som det är starkt nog för att ge formstabilitet och klara av externa krafter. Samtidigt är det flexibelt nog att kunna vika ihop. Det andra konceptet som föreslogs av gruppen är ett koncept med en reflektor och en extern stödstruktur. Reflektorn består av ett tyg medan stödstrukturen är gjort av polyeten. Båda dessa koncept uppfyllde våra mål samt företagets krav vad gällde vikten, transportvolymen och hållfasthet.

  • 79.
    ABDUL-JALIL, RICHARD
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    SELMAN, CHRISTOS
    KTH, Skolan för industriell teknik och management (ITM), Tillämpad maskinteknik (KTH Södertälje).
    Effektivisering och optimering av transport och emballage för kretskort2015Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
  • 80.
    Abdullah Asif, Farazee M.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Information requirements and management for service based business models2014Inngår i: Swedish Production Symposium, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Anticipated scarcity of natural resources and concern for the sustainable development forcing manufacturing industries to emphasise on conservation of resources on one hand. On the other hand high competition in the manufacturing industry is forcing companies to look for innovative value propositions. Service based business models are emerging business solutions that fulfil the functional needs of customers. Such business approach demands extensive and sophisticated information collection, sharing and management systems. However, there are evidences of knowledge gap when it comes to defining information requirements, information management and sharing systems needed to adopt such business models. The objective of this paper is to provide an overview of research done in the area of service based business models in terms of information management and communication systems. The paper also includes result of two case studies done in two different manufacturing companies with the purposes to understand information requirements to adopt service based business models.

  • 81.
    Abdullah Asif, Farazee Mohammad
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Resource Conservative Manufacturing: New Generation of Manufacturing2011Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The question of resource scarcity and emerging pressure of environmentallegislations have put the manufacturing industry with a new challenge. On theone side, there is a huge population that demands a large quantity ofcommodities, on the other side, these demands have to be met by minimumresources and with permissible pollution that the earth’s ecosystem can handle.In this situation, technologic breakthrough that can offer alternative resourceshas become essential. Unfortunately, breakthroughs do not follow any rule ofthumb and while waiting for a miracle, the manufacturing industry has to findways to conserve resources. Within this research the anatomy of a large body ofknowledge has been performed to find the best available practices for resourceconservation. Critical review of the research revealed that none of the availablesolutions are compatible with the level of resource conservation desired by themanufacturing industry or by society. It has also been discovered that a largegap exists between the solutions perceived by the scientists and theapplicability of those solutions. Through careful evaluation of the state-of-theart,the research presented in this thesis introduced a solution of maximizingresource conservation i.e., material, energy and value added, as used inmanufacturing. The solutions emerged from the novel concept named asResource Conservative Manufacturing, which is built upon the concept ofMultiple Lifecycle of product. Unlike other research work, the researchdocumented in this thesis started with the identification of the problem andfrom which a ‘wish to do’ list was drawn. The seriousness of the problem andpotential of adopting the proposed concept has been justified with concreteinformation. A great number of arguments have been presented to show theexisting gaps in the research and from that, a set of solutions to conserveresources has been proposed. Finally, one of the prime hypotheses concerningclosed loop supply chain has been validated through the system dynamicsmodeling and simulation.

  • 82.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Lieder, Michael
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Multi-method simulation based tool to evaluate economic and environmental performance of circular product systems2016Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 139, s. 1261-1281Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose: The transition from linear to circular product systems is a big step for any organization. This may require an organization to change the way it does business, designs product and manages supply chain. As these three areas are interdependent, bringing change in one area will influence the others, for instance, changing the business model from conventional sales to leasing will demand changes in both product design and the supply chain. At the same time, it is essential for an organization to anticipate the economic and environmental impact of all changes before it may decide to implement the circular product systems. However, there is no tool available today that can assess economic and environmental performance of circular product systems. The purpose of this research is to develop a multi-method simulation based tool that can help to evaluate economic and environmental performance of circular product systems. Method: The conceptual models that are used to develop the tool have been formulated based on review of the state-of-the-art research. System Dynamics (SD) and Agent Based (AB) principles have been used to create the simulation model which has been implemented in Anylogic software platform. Originality: This research presents the first multi-method simulation based tool that can evaluate economic and environmental performance of circular product systems. Findings: Multi-method simulation technique is useful in designing dynamic simulation model that takes into consideration mutual interactions among critical factors of business model, product design and supply chain. It also allows predicting system's behaviour and its influence on the economic and environmental performance of circular product systems.

  • 83.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Nicolescu, Cornel Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Minimizing Uncertainty Involved in Designing the Closed-loop Supply Network for Multiple-lifecycle of Products2010Inngår i: Annals Of DAAAM for 2010 & Proceedings of 21st DAAAM Symposium: Intelligent Manufacturing and Automation / [ed] Branko Katalinic, Zadar: DAAAM International , 2010, s. 1055-1056Konferansepaper (Fagfellevurdert)
    Abstract [en]

    To ensure multiple-lifecycle of products through remanufacturing intervention requires a well-functioning closed-loop supply network. Generally, the unpredictability of quantity, timing and quality (physical/functional) of the returned products and demand fluctuation of the remanufactured products are the main sources of uncertainty of closed-loop supply network. To some extent, efficient recollection strategies and separate distribution channels for remanufactured products can minimize the uncertainty. Nevertheless, efficient recollection does not necessarily close the loop if the recovered products do not enter into the main stream of the supply network. Beside, products that are distributed through separate channels create an open loop. Thus, the problem of uncertainty remains unsolved. The aim of this paper is to propose solutions to minimize the uncertainty involved in designing a well-functioning closed-loop supply network using the system dynamics principle and tool.

  • 84.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Bianchi, C.
    Nicolescu, Cornel Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    System dynamics models for decision making in product multiple lifecycles2015Inngår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 101, s. 20-33Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The main drivers for adopting product multiple lifecycles are to gain ecological and economic advantages. However, in most of the cases it is not straight forward to estimate the potential ecological and economic gain that may result from adopting product multiple lifecycles. Even though many researchers have concluded that product multiple lifecycles result in gain, there are examples which indicate that the gain is often marginal or even none in many cases. The purpose of this research is to develop system dynamics models that can assist decision makers in assessing and analysing the potential gain of product multiple lifecycles considering the dynamics of material scarcity. The foundation of the research presented in this paper is laid based on literature review. System dynamics principles have been used for modelling and simulations have been done on Stella iThink platform. The data used in the models have been extracted from different reports published by World Steel Association and U.S. Geological Survey. Some of the data have been assumed based on expert estimation. The data on iron ore reserves, iron and steel productions and consumptions have been used in the models. This research presents the first system dynamics model for decision making in product multiple lifecycles which takes into consideration the dynamics of material scarcity. Physical unavailability and price of material are the two main factors that would drive product multiple lifecycles approach and more sustainable decisions can be made if it is done by taking holistic system approach over longer time horizon. For an enterprise it is perhaps not attractive to conserve a particular type of material through product multiple lifecycles approach which is naturally abundant but extremely important if the material becomes critical. An enterprise could through engineering, proper business model and marketing may increase the share of multiple lifecycle products which eventually would help the enterprise to reduce its dependency on critical materials.

  • 85.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Roci, Malvina
    KTH.
    Lieder, Michael
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Produktionssystem.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Produktionssystem.
    Štimulak, M.
    Halvordsson, E.
    De Bruijckere, R.
    A practical ICT framework for transition to circular manufacturing systems2018Inngår i: Procedia CIRP, Elsevier, 2018, s. 598-602Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The transition towards a circular economy has become important. Manufacturing industry being a major stakeholder in this transition has started exploring the potential of this transition and challenges in implementation. Ambitious companies such as Gorenje d.d. has taken the circular economy transition seriously and aims to become a pioneer in implementing circular manufacturing systems. One vital step in this transition is the business model shift from the linear (sales model) to a circular model such as 'product as a service'. This brings new challenges to Original Equipment Manufacturers (OEMs) that have never been experienced in their conventional businesses. One of the challenges is to establish an information communication and technology (ICT) infrastructure that enables information management and sharing as well as establishes a real-time communication between relevant stakeholders. Outlining such an ICT infrastructure is the objective of this paper.

  • 86.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Semere, Daniel Tesfamariam
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Nicolescu, Cornel Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Haumann, M.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    METHODS ANALYSIS OF REMANUFACTURING OPTIONS FOR REPEATED LIFECYCLE OF STARTERS AND ALTERNATORS2010Inngår i: 7th International DAAAM Baltic Conference"INDUSTRIAL ENGINEERING"22-24 April 2010, Tallinn, Estonia / [ed] R. Kyttner, Estonia: Tallinn University of Technology , 2010, s. 340-345Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Design for Repeatedly Utilization (DFRU) is a proposed conceptto be used in the product realizationprocess to ensure optimum useable life (forinstance in terms of economy, resourceusage, environmental impact etc.) ofproducts or parts of products enablingmultiple lifecycle. In the DFRU approachproducts are restored as new like productsthrough remanufacturing processes. Theterm remanufacturing has been interpreteddifferently by different researchers and theindustries that are involved inremanufacturing business use differentapproaches to remanufacture theirproducts. In this paper the starter motorand alternator of automotives has beenused to demonstrate the novel concepts.The purpose of this paper is to expresswhat remanufacturing means in ourconcept, model their major lifecycleaspects and create a simulation modelfrom it. This is a preliminary work towardsdefining and specifying the processes,methods and design properties in DFRU.The work will be further extended to aholistic business model which can facilitateDFRU approach in an efficient way. Infuture the model will be developed andadopted to create new models for otherproducts appropriate for remanufacturingand eventually DFRU.

  • 87.
    Abdullah, Maizura Ailin
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Integrerad produktutveckling.
    Öhrwall Rönnbäck, A
    Ölundh Sandström, Gunilla
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Integrerad produktutveckling.
    Building Networks for Delivering Integrated Product-Service Offerings (IPSOs)2010Konferansepaper (Fagfellevurdert)
  • 88.
    Abdullah, Tazhan
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Entreprenörskap och Innovation.
    Suppl-SideRiskMitigationinManufacturingCompany2013Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Supply chain risk is a challenge, because they can disrupt the supply of components and raw

    material to the company. The Supply Chain Risk Management (SCRM) is reality in today’s

    resource-optimized supply systems. Disruption can cause an increase of production cost. In more

    serious production breaks it can jeopardize the fulfillment of contracts.

    The complexity of supply network increases risk as the rate of dependency on both single and

    dual sourcing increases either jointly or separately. When suppliers are placed far away, the risk

    of interference in time increases, which is the case of today’s global companies is a common

    issue.

    A framework has been developed in this study based on previous literature to investigate the

    sources of the supply-side risk and its categories, to implement the mitigation strategies the

    company can reduce the probability of occurrence of any undesired event and negative impacts.

    The proposed framework was applied, in form of a case study, on the global truck manufacturer

    Scania. Two managers of the company were interviewed by the author with this purpose.

    The main findings indicate that when the framework was applied, mitigation strategies were

    effective in truck manufacturing industry such as Scania. In the case of Scania, two more risk

    sources that were not included in the framework are monitored by the company, namely safety

    and health and security. In summarizing, the establishment of the risk mitigation strategiesmapping

    up, follow up, and continuous improvement, leads to improvement of the OEM. Formal

    training programs to achieve continuous improvement and the participation of the crossfunctional

    groups in the mapping and follow up practices to create a successful supply chain risk

    management.

  • 89. Abe, T.
    et al.
    Sundman, Bo
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Termodynamisk modellering.
    Onodera, H.
    Thermodynamic assessment of the Cu-Pt system2006Inngår i: Journal of Phase Equilibria and Diffusion, ISSN 1547-7037, Vol. 27, nr 1, s. 5-13Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A CALPHAD assessment of the Cu-Pt system has been carried out. Two and four sublattice models were applied to describe the Gibbs free energies of ordered phases where the contribution of SRO is taken explicitly into account through the reciprocal parameters. The disordered fcc A1 and liquid phases were treated as substitutional solutions. A consistent set of parameters for the phases in the Cu-Pt system as obtained, and those parameters can satisfactorily reproduce the experimental phase equilibria and thermodynamic properties, such as enthalpies, activity of Cu, and long-range order parameters.

  • 90.
    Abedi, Ali
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    Falk, Sebastian
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    Motivation på byggarbetsplatsen2011Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Att arbeta som hantverkare på en byggarbetsplats är ett krävande jobb, både fysiskt såväl som psykiskt. Snäva tidsplaner, hårda förhållanden och tuffa utmaningar väntar hantverkarna varje ny arbetsdag. För att genomföra ett lyckat projekt krävs det därför att hantverkarna presterar höga resultat och visar stort engagemang i sitt arbete. Motivation är således en framgångsfaktor samt en nödvändighet för varje lyckat projekt. Följande studie kommer att undersöka hur platsledningen motiverar sina hantverkare samt hur motivation kan bidra till mer lyckade byggprojekt.

    Studien är baserad på litteraturstudier kring motivation, ledarskap och grupper. Vidare har kvantitativa och kvalitativa undersökningar utförts i form av personliga intervjuer och enkätundersökningar. Studien har utförts på tre byggprojekt av samma karaktär, samtliga tillhörande Peab bostad. Respektive platschef har intervjuats och arbetslagen har deltagit i en enkätundersökning. Enkätundersökningen visar att hantverkarna upplever att lönen är den största källan till motivation. Mjuka faktorer såsom gemenskap och uppskattning var även avgörande, dock inte i lika stor utsträckning som de monetära belöningarna. Platsledningen delade uppfattningen, däremot ansåg samtliga platschefer att de mjuka faktorerna har större påverkan på motivationen.

    Resultatet av studien visar tydligt att lönen är och förblir en stor motivationsfaktor för hantverkarna dock spelar de sociala faktorerna en stor roll. I utvecklingen och arbetet med dessa ligger nyckeln till hög och lång och farmför allt långvarig motivation. Studien visar att en god motivation leder till ökad trivsel och engagemang för projektet. Detta bidrar till att göra byggprojekten mer lönsamma och därmed lyckade.

    För att erhålla denna höga motivation krävs arbete och planering från platsledningen sida. Genomförandet av dagliga rundor under vilka platschefen på ett informellt sätt diskuterar problem och planerar inför nästkommande moment har visat sig vara ett gott verktyg för att skapa motivation. Då hantverkarna känner sig sedda, uppskattade och upplever att de får möjlighet att påverka projektet växer motivationen. Det gäller även för platsledningen att skapa förutsättningar så att hantverkarna kan göra ett gott arbete samt att ge dem utrymme att i viss mån styra sitt arbete själva. Studien kan summeras i att ansvar under frihet, uppskattning, delaktighet, god planering samt en god lön är de faktorer som skapar en god och långvarig motivation hos hantverkarna.

  • 91.
    Abedi, Aref
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Wallsten, Jakob
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Beslutsfattande inom Produktutveckling: Kartläggning, analysering & vidareutveckling av PPM process på ett medtech företag2009Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The number of ideas at innovative companies usually exceeds the amount of available human or

    material recourses, this include ideas for development of new products. Since they are not able to do

    everything they want to do they have to choose between ideas to develop new products. This includes

    the decision on when to start, stop or kill a project as well as the thought process of prioritizing between

    ongoing and potential projects.

    Project Portfolio Management (PPM) is an organizational process, with the purpose of systematically

    organizing and running the activities that aim to evaluate, select and prioritize ideas and projects for

    developing new products. PPM include four major goals to be fulfilled; Maximizing Value of the

    Portfolio, Achieving a Balanced Portfolio, Achieving a Strategic Alignment and Running the Right

    Number of Projects.

    The purpose of the thesis was to develop a more visual and formal PPM process for the early stages in

    product development in one department at St Jude Medical AB, Sweden.

    The thesis was conducted by following a methodology known as Process Modules. The methodology is

    an approach for developing a PPM process that fits a specific company. The methodology is not a

    defined work procedure for decision making but rather a systematic method for developing one.

    The thesis was conducted by working closely with a defined Work Group consisting of six decision

    makers at St Jude Medical AB, Sweden. Initially, the authors managed to map the current PPM process

    at the department in focus which showed to be rather informal and not using formal criteria. Together

    with the Work Group, the process was formalized and visualized. During a workshop, a set of selection

    criteria were identified and defined, and so was a set of balance criteria. Finally, the new PPM process

    was defined and visualized by the authors.

    A number of overall important reflections were concluded by the authors after conducting this master

    thesis. The main reflection is the fact that every PPM process is, and needs to be, company specific.

    Further on, when developing a PPM process it is of great importance to involve management and

    involved staff in the actual procedure, in order to increase the understanding of the final process.

  • 92.
    Abele, Andreas
    et al.
    Continental Gmbd, Germany.
    Johansson, Rolf
    SP.
    Lönn, Henrik
    Volvo Technology AB.
    Papadopoulos, Yiannis
    Hull University, UK.
    Reiser, Mark-Oliver
    Technical Univ of Berlin.
    Servat, David
    CEA, France.
    Törngren, Martin
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Inbyggda styrsystem.
    Weber, Matthias
    Technische Universit¨at Berlin, DE.
    The CVM framework: A prototype tool for compositional variability management2010Inngår i: Proceeding of: Fourth International Workshop on Variability Modelling of Software-Intensive Systems, 2010, s. 101-105Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This article announces the first public release ofan experimental research tool for variability management,called “CVM framework” and provides an overview of thetool’s capabilities and architecture.

  • 93. Abele, Eberhard
    et al.
    Chryssolouris, George
    Sihn, Wilfried
    Metternich, Joachim
    ElMaraghy, Hoda
    Seliger, Guenther
    Franzén Sivard, Gunilla
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    ElMaraghy, Waguih
    Hummel, Vera
    Tisch, Michael
    Seifermann, Stefan
    Learning factories for future oriented research and education in manufacturing2017Inngår i: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604, Vol. 66, nr 2, s. 803-826Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Learning factories present a promising environment for education, training and research, especially in manufacturing related areas which are a main driver for wealth creation in any nation. While numerous learning factories have been built in industry and academia in the last decades, a comprehensive scientific overview of the topic is still missing. This paper intends to close this gap by establishing the state of the art of learning factories. The motivations, historic background, and the didactic foundations of learning factories are outlined. Definitions of the term learning factory and the corresponding morphological model are provided. An overview of existing learning factory approaches in industry and academia is provided, showing the broad range of different applications and varying contents. The state of the art of learning factories curricula design and their use to enhance learning and research as well as potentials and limitations are presented. Conclusions and an outlook on further research priorities are offered. (C) 2017 Published by Elsevier Ltd on behalf of CIRP.

  • 94.
    Abelin, Sarah
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
    Investigation of integrated waterlevel sensor solution forsubmersible pumps: A study of how sensors can be combined towithstand build-up materials and improvereliability in harsh environment2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Monitoring water level in harsh environment in order to handle the start and stop function of drainage pumps has been a major issue. Several environmental factors are present, which affect and disturb sensor measurements. Current solutions with mechanical float switches, mounted outside of pumps, wear out, get entangled and account for more than half of all the emergency call outs to pumping stations. Since pumps are frequently moved around, a new sensor solution is needed which can be integrated within the pump house and is able to continuously monitor water level to optimize the operation of the pump and to decrease wear, cost and energy consumption.

    This thesis presents an investigation how different sensor techniques can be combined to improve reliability for monitoring water level and handle the start and stop function of drainage pumps in harsh environment. The main focus has been to identify suitable water level sensing techniques and to investigate how sensors are affected by build-up materials building up on the pump surface and covering the sensor probes. A support vector machine algorithm is implemented to fuse sensor data in order to increase reliability of the sensor solution in contaminated condition.

    Results show that a combination of a pressure sensor and a capacitive sensor is the most suitable combination for withstanding build-up materials. For operating conditions when sensors are covered with soft or viscous build-ups, sensors were able to monitor water level through the build-up materials. No solution was found that could satisfactorily monitor water level through solidified build-up materials.

  • 95.
    Abella, Tricia Jennifer
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    The Creative Approach to Vanguard Projects2011Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    A vanguard project is the firm’s entrepreneurial vehicle for exploring opportunities, creating new products, services or markets. This type of projects requires flexibility and innovation to thrive. In this regard, a creative approach to project management is proposed for the successful execution of such projects. This creative approach is summarized in a framework that consists of two main components – flexible planning and creative climate.

    The Central Services project, a vanguard in telecommunications, was used to benchmark the creative project management framework to the current project management methodology of the IT department of TIWS. Results show that there is a gap between the framework and the status quo. Moreover, the Central Services project is not efficiently and effectively managed, therefore, resulting to project delays which consequentially lead to negative company revenues. This reality strengthens the proposition that vanguard projects should be managed differently; hence, the birth of creative project management.

  • 96.
    Abenoza, Roberto
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Samhällsplanering och miljö.
    Cats, Oded
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Transportplanering. Department of Transport and Planning, Delft University of Technology, P.O. Box 5048, GA Delft, 2600, Netherlands.
    Susilo, Yusak
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Samhällsplanering och miljö. KTH, Skolan för industriell teknik och management (ITM), Centra, Integrated Transport Research Lab, ITRL.
    Determinants of traveler satisfaction: Evidence for non-linear and asymmetric effects2019Inngår i: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517, Vol. 66, s. 339-356Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Classifying public transport service attributes based on their influence on overall traveler satisfaction can assist stakeholders and practitioners in introducing cost-efficient measures. To date most studies employed methods that were based on the assumption that the impact of service attributes on traveler satisfaction is entirely linear and symmetric. This study examines whether service attributes have a non-linear and asymmetric influence on the overall travel experience by employing the Three-factor theory (basic, performance and exciting factors). The analysis is conducted for different traveler segments depending on their level of captivity, travel frequency by public transport and travel mode used, and is based on a relatively large sample size collected for Stockholm County. Moreover, the estimated models control for important socio-demographic and travel characteristics that have been insofar overlooked. Results are presented in the form of a series of multi-level cubes that represent different essentiality of traveler needs which provide a useful methodological framework to further design quality service improvements that can be applied to various geographical contexts. Our findings highlight that a “one size fits all” approach is not adequate for identifying the needs of distinct traveler segments and of travelers using different travel modes. Furthermore, two-thirds of the attributes are consistently classified into the same factor category which entails important policy implications. This research deepens and expands the very limited knowledge of the application of the three-factor theory in the transport field.

  • 97.
    Abeywardana, Asela M.A.J.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Solar-Biomass hybrid system for process heat supply in medium scale hotels in Sri Lanka2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This study aimed at evaluating and demonstrating the feasibility of using Concentrated Solar Thermal technology combined with biomass energy technology as a hybrid renewable energy system to supply the process heat requirements in small scale industries in Sri Lanka. Particularly, the focus was to apply the concept to the expanding hotel industry, for covering the thermal energy demand of a medium scale hotel.

    Solar modules utilize the rooftop area of the building to a valuable application. Linear Fresnel type of solar concentrator is selected considering the requirement of the application and the simplicity of fabrication and installation compared to other technologies. Subsequently, a wood-fired boiler is deployed as the steam generator as well as the balancing power source to recover the effects due to the seasonal variations in solar energy. Bioenergy, so far being the largest primary energy supply in the country, has a good potential for further growth in industrial applications like small hotels. 

    When a hotel with about 200-guests capacity and annual average occupancy of 65% is considered, the total annual CO2 saving is accounted as 207 tons compared with an entirely fossil fuel (diesel) fired boiler system. The annual operational cost saving is around $ 40,000 and the simple payback period is within 3-4 years. The proposed hybrid system can generate additional 26 employment opportunities in the proximity of the site location area.  

    This solar-biomass hybrid concept mitigates the weaknesses associated with these renewable technologies when employed separately. The system has been designed in such a way that the total heat demand of hot water and process steam supply is managed by renewable energy alone. It is thus a self-sustainable, non-conventional, renewable energy system. This concept can be stretched to other critical medium temperature applications like for example absorption refrigeration. The system is applicable to many other industries in the country where space requirement is available, solar irradiance is rich and a solid biomass supply is assured.

  • 98.
    Abeywecra, Ruchira
    et al.
    OUSL, Dept Mech Engn, Nugegoda, Sri Lanka..
    Scnanavakc, Nihal S.
    OUSL, Dept Mech Engn, Nugegoda, Sri Lanka..
    Jayasuriya, Jeevan
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Fransson, Torsten H.
    EIT InnoEnergy, Eindhoven, Netherlands..
    A Remote Mode High Quality International Master Degree Program in Environomical Pathways for Sustainable Energy Systems (SELECT) -Pilot Program Experiences During First Year of Studies2018Inngår i: PROCEEDINGS OF 2018 IEEE GLOBAL ENGINEERING EDUCATION CONFERENCE (EDUCON) - EMERGING TRENDS AND CHALLENGES OF ENGINEERING EDUCATION, IEEE , 2018, s. 276-284Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Remote mode study programs at master degree level are becoming more popular than undergraduate level programs. Students after graduation with Bachelors degree very often are employed and the most appropriate mode for them to pursue higher studies is the remote mode. Postgraduate programs with one or two year duration mostly focus on specific areas of research based industrial application. Traditional remote education is thought to be more centered on web based on-line programs with a little opportunity for teacher student interaction and interaction with peers. In such programs motivation for studies has been a problem and as a result many students drop off and also those remain in the program for prolonged periods do not show good performance. One of the reasons for failures of students in remote studies is the isolation leading to discouragement for the completion studies. A remote mode Master Degree Program in Environomical Pathways for Sustainable Energy Systems (MSc-SELECT), consisting of a number of innovative features aimed at improved student engagement, motivation, exposure to experiences in multi-national setting and team work, was developed and implemented by the Master School of the EIT-InnoEnergy, as a pilot project. The program was offered, collaboratively and simultaneously to students in three locations, Royal Institute of Technology in Sweden, Universitat Politecnica de Catalunya in Spain and the Open University of Sri Lanka. The students in Sweden and Spain each followed 50% of the courses on-campus and 50% in remote mode depending upon the university they registered with. The students in Sri Lanka followed the entire 1st year fully remotely. All the students (from KTH, OUSL and UPC) will spend the 2nd year on-campus at another university in the consortium. This paper discusses, from the perspective of the fully remote site, the remote program with its innovative aspects, student performance and experience together with future tasks for making the program viable and beneficial to all partner countries.

  • 99. Abeyweera, Ruchira
    et al.
    Senanayake, Nihal S.
    Senaratne, Chamindie
    Jayasuriya, Jeevan
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi. EIT InnoEnergy, Sweden.
    Fransson, Torsten H.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi. EIT InnoEnergy, Sweden.
    Capacity Building Through a Web Based Master Degree Programme in Sustainable Energy Engineering2017Inngår i: PROCEEDINGS OF 2017 IEEE GLOBAL ENGINEERING EDUCATION CONFERENCE (EDUCON2017), IEEE, 2017, s. 800-805Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Open Distance Learning is gaining popularity as a successful alternative for on-campus higher education especially with the emergence of web based platforms which enable the online delivery of courses worldwide. This emerging educational pedagogy can successfully be employed as means of capacity building of the people living in the less fortunate parts of the world where higher education especially at master level are scarce. This paper presents a two-year collaborative master study programme in sustainable energy engineering offered in synchronous with an on-campus study programme conducted by the KTH Royal Institute of Technology of Sweden, to students of Sri Lanka, which was facilitated by the Open University of Sri Lanka. The paper describes the need of such a programme, the format of course delivery and assessment thereof, plus the benefits gained. This programme has produced 72 post graduates in Sri Lanka alone and more than 200 distant postgraduates worldwide in the field of sustainable energy engineering during last 10 years period. In terms of capacity building in the energy sector in Sri Lanka this is considered a great achievement. The experience gained by the local staff in the role of local facilitators who engaged in some of the academic related activities such as evaluation of students' presentation and co-supervision of thesis projects have been greatly appreciated as being additional benefits to the staff in terms of their own academic development and capacity building. Finally, conclusions are made on how remote programmes of study could successfully be delivered to places where such know-how is scarce by adapting appropriate technologies in training personnel at postgraduate level to meet the needs of the industry.

  • 100.
    Abid, Hamza
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Techno-economic analysis of energy storage integration for solar PV in Burkina Faso2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Electrification in rural areas of West African countries remain to be a challenge for the growth of the region. The Economic Community of West African States (ECOWAS) has set a target of 2030 to achieve 100% electrification in all member countries. Burkina Faso is one of the least electrified countries in the world, where only 9 % of the rural population has access to electricity. This study presents a conceptualization of techno-economic feasibility of pumped hydro storage (PHS) and electric batteries with solar photovoltaics (PV) in the context of Burkina Faso. The results are explored for an off grid standalone PV plus storage system for a rural setting and a grid connected PV system for an urban setup. The least cost configurations for both the cases are determined using HOMER (Hybrid Optimization Model for Electric Renewables). The results indicate the need of extended solar penetration in Burkina Faso in response to the challenges of low electrification rates in the country. Adding more PV to the present electricity mix of Burkina Faso could drive down the cost of energy by 50 % compared to the present grid electricity prices by making cheap electricity available to the local population. Adding PHS to grid connected PV leads to a cost reduction of 8% over a lifetime of 25 years which does not provide enough motivation for the high investments in storage at present. Policy interventions that allow stacking up of revenues and benefits of storage are needed to make it more competitive. PV plus pumped hydro storage remains the optimal system architecture as compared to PV plus electric batteries for off grid standalone systems provided the geographic availability of lower and upper reservoirs. The capital cost of PV remains to be the most dominating factor in the cost of optimal system for both the urban and the rural cases, and driving down the costs of PV would have the most positive effect for increased electricity access in the country.

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