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  • 1.
    Abbas, Rami
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Issa, Simon
    Mälardalen University, School of Business, Society and Engineering.
    Landenberg, Kevin
    Mälardalen University, School of Business, Society and Engineering.
    Utdelning i fåmansbolag: Reformers påverkan på beteende och agerande2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Date:                        2018-01-15

    Level:                       Bachelor thesis in Business Administration, 15 cr

    Institution:                         School of Business, Society and Engineering, Mälardalen University

    Authors:                  Rami Abbas             Simon Issa                          Kevin Landenberg              92/03/26                                 92/02/02                                       94/08/11

    Title:                        Dividend in close companies

    Keywords:              Dividend, qualified shares, the canceled proposition 2017, tax behavior

    Research

    Questions:               What possible changes in behavior has the cancelled proposition generated at decision making in close companies?

                                     What impact do tax reforms have on tax behavior?

    Purpose:                  The purpose of the survey is to create an understanding about if and how close companies have acted towards the rejected proposition of change in the 3:12 rules. In addition to this, the purpose is also to create an understanding of what impact tax reforms have on tax behavior.

    Method:                   Regulations regarding dividend opportunities in close companies, have been collected and analyzed. Theoretical data collection on reformers' impact on tax behavior has been collected. In addition, interviews have been conducted with owners of close companies and authorized auditors.

    Conclusion:              The proposition of change that were rejected in the summer of 2017 had no significant impact on majority of the shareholders at close companies. This is due to complicated regulations. In specific cases, when reforms are too complicated, it requires the involved partners a learning time to acquire new knowledge and therefore do not have the time or knowledge to respond to the reform requirements.

  • 2.
    Abdallah, Caroline
    Mälardalen University, School of Business, Society and Engineering.
    Hur påverkar logistikplaneringen byggarbetsplatsen?: En enkätundersökning om logistikkostnader i produktion2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Logistics planning for a construction site is usually limited by traffic flow to and from the workplace. The geographical location of the construction site is determined by roads around the workplace and opportunities for well-functioning logistics. Inventory of material is often impossible because of the frequently small workspaces. As a result, a concern relating material handling remains . Even before the establishment of a construction site, it is required in the construction industry to eliminate errors that might arise in the planning stage. The aim of this study was to contribute with better understanding of the relationship between well-planned logistics and reduced costs at the Swedish construction company Peab. To clarify this a survey was submitted at two construction sites and a sample of calculations were performed on reduced / additional costs at examples of "good" and "bad" planning of logistics, to show how to reduce costs.

    Higher requirements are placed on construction firms and demand such as shorter project times and lower costs and this is supposed to lead to a high profitability. To increase the profitability it is required that the construction industry is planning the amount of resources, manpower, material and time in the absolutely best way. Logistics is a part of the construction industry which may help reduce costs and provide greater profitability, if it is seen as a saving and not just a cost. There should, in other words, be a greater emphasis on planning of the logistics already at early stages of projects.

    There is a great amount of work on purchase of materials in the company Peab in the current situation, but if the company also put equal work on logistics, the planning could be optimized even before the project starts. Through good planning Peab will not only save on cost of purchase, but may also contribute to a better handling of material. Better handling of material also contributes to reduced costs for the project. Material is not only bound capital but can also disappear in waste, thievery or even destroyed. This is also appreciated by both professional workers and employees in the workplace. The opportunities for improvement and efficiency of logistics at Peab are great. By selecting a logistics manager at each construction project and also having a specialist in charge of the region that serves as support for the projects, Peab can save on logistics. The purpose of this report is to look at changing the view of logistics today on construction sites. The result of the calculation examples and survey shows where the largest cost items located in the various projects and how to achieve lower costs through better planning. This in turn helps the company increase profitability in the long term.

    Keyword: Logistic, Planning, Lean, Profability

  • 3.
    Abdi, Akam
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Chen, Wei
    Mälardalen University, School of Business, Society and Engineering.
    Intern kontroll: Används visselblåsning som mekanism i den interna kontrollenmot oegentligheter av ekonomisk brottslighet inom kreditinstituten?2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the study is to examine the banks view of internalcontrol and further investigate what mechanisms are used tostreamline the internal controls. The study is directed into whetherthe whistle-blowing is used as one of the tools in the internalcontrol to enhance the ability to detect and prevent irregularities ofa financial character.

    The study use a inductive method to lead the collection of datamaterial. The study further use a qualitative method based on fourinterviews with different banks were this data material is comparedwith existing theories in the second chapter.

    The study shows that the view of internal control and whistleblowingis positive in the process to create a successful company inthe banks. Despite that the whistle- blowing is known as acomplicated function, it’s still used to detect and preventirregularities of crimes, such of financial character. Except whistleblowing,the banks are using more tools to streamline the internalcontrol. To urge employees to comply laws and other principles,education in different areas for employers but also to createdifferent work approaches in the company, to make internal checkupsand constant supervision of the organization work is some ofthe tools that are used.

  • 4.
    Abdi, Akam
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Chen, Wei
    Mälardalen University, School of Business, Society and Engineering.
    Tystnads- och anmälningsplikten: Revisorns hantering av konflikter för ett oberoende ställning och vid misstanke om brott2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to create a deeper and also a better understanding about how each of the professional secrecy and obligation to report are perceived from auditors and further investigate how the potential conflicts based on independence and “can be suspect” are handled by the auditors. The purpose has been achieved through interviews with four different accounting firms.

    The interviews were conducted with Grant Thornton, BDO Mälardalen AB, PwC and KPMG to answer the research questions. Subsequently, a hermeneutic approach was used to since the interpretation of the interviews was considered as important to obtain knowledge of the respondent’s perception about the topic. In the analyze chapter have dataset from the reference framework and empirical part been used to implement the analyze of the thesis.

    The study shows that the professional secrecy is important for creating a good relationship with clients and is not considered as a rule that create conflicts for auditors. The obligation to report, however, is creating conflicts because of the lack of knowledge in assessment of economic crimes. The auditors therefore decide to investigate a situation that “can be suspect” beyond what is intended. To not become dependent on the clients, there are rules and profession practices that are used and also examples like not having friends or family members as clients.

  • 5.
    Abdi, Akam
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Chen, Wei
    Mälardalen University, School of Business, Society and Engineering.
    Tystnads- och anmälningsplikten: Revisorns hantering av konflikter för ett oberoende ställning och vid misstanke om brott2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to create a deeper and also a better understanding about how each of the professional secrecy and obligation to report are perceived from auditors and further investigate how the potential conflicts based on independence and “can be suspect” are handled by the auditors. The purpose has been achieved through interviews with four different accounting firms.

    The interviews were conducted with Grant Thornton, BDO Mälardalen AB, PwC and KPMG to answer the research questions. Subsequently, a hermeneutic approach was used to since the interpretation of the interviews was considered as important to obtain knowledge of the respondent’s perception about the topic. In the analyze chapter have dataset from the reference framework and empirical part been used to implement the analyze of the thesis.

    The study shows that the professional secrecy is important for creating a good relationship with clients and is not considered as a rule that create conflicts for auditors. The obligation to report, however, is creating conflicts because of the lack of knowledge in assessment of economic crimes. The auditors therefore decide to investigate a situation that “can be suspect” beyond what is intended. To not become dependent on the clients, there are rules and profession practices that are used and also examples like not having friends or family members as clients.

  • 6.
    Abdi, Sade
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Rathmaya, Noureddine
    Mälardalen University, School of Business, Society and Engineering.
    Managing employees and promoting internal communication during change: A case study of change management at MTR Tunnelbanan AB2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 7.
    Abdisalam Ahmed, Hinda
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Teimouri, Meriem
    Mälardalen University, School of Business, Society and Engineering.
    Svensk invandrar- och integrationspolitik och dess förändring: Fallet Vallby i Västerås2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 8.
    Abdlwafa, Lezan
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Balci, Anita
    Mälardalen University, School of Business, Society and Engineering.
    Safari, Awat
    Mälardalen University, School of Business, Society and Engineering.
    Bokföringsbrott: Ett resultat av oaktsamhet i bokföring?2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Datum: 29 maj, 2013

    Nivå: Kandidatuppsats i företagsekonomi, 15 hp

    Institution: Akademin för ekonomi, samhälle och teknik, ESTMälardalens Högskola

    Författare: Lezan Abdlwafa, Anita Balci & Awat Safari

    Titel: Bokföringsbrott – Ett resultat av oaktsamhet i bokföring?

    Handledare: Ulla Pettersson

    Nyckelord: Bokföringsbrott, oaktsamhet, bokföringsskyldighet, god redovisningssed, Ekobrottsmyndigheten, Skatteverket, konkursförvaltare

    Frågeställning: På vilket sätt leder näringsidkarens oaktsamhet i bokföring till bokföringsbrott? Vilka faktorer bidrar till detta?

    Syfte: Att undersöka hur näringsidkarens oaktsamhet i bokföringen kan vara en av orsakerna till bokföringsbrott.

    Metod: För att uppnå syftet så använde vi oss av en kvalitativ metod för att få en djupare förståelse av ämnet. Vi inhämtade vårt material till referensramen från litteratur samt lagar såsom bokföringslagen, årsredovisningslagen och brottsbalken. Material till empirin var hämtad från tre intervjuer med personer som besitter relevant kunskap, en skattebrottsutredare, en konkursförvaltare och en åklagare.

    Slutsats: Det vi har kommit fram till i vår uppsats är att oaktsamhet i bokföring är en orsak till bokföringsbrott, främst i mindre företag som inte har resurser till att upprätta bokföring på ett sätt som ger en rättvisande bild av företagets ekonomiska ställning.

  • 9.
    Abubaker, J.
    et al.
    SLU.
    Odlare, Monica
    Mälardalen University, School of Business, Society and Engineering.
    Pell, M.
    SLU.
    Nitrous Oxide Production from Soils Amended with Biogas Residues and Cattle Slurry2013In: Journal of Environmental Quality, ISSN 0047-2425, E-ISSN 1537-2537, Vol. 42, no 4, p. 1046-1058Article in journal (Refereed)
    Abstract [en]

    The amount of residues generated from biogas production has increased dramatically due to the worldwide interest in renewable energy. A common way to handle the residues is to use them as fertilizers in crop production. Application of biogas residues to agricultural soils may be accompanied with environmental risks, such as increased N2O emission. In 24-d laboratory experiments, N2O dynamics and total production were studied in arable soils (sandy, clay, and organic) amended with one of two types of anaerobically digested biogas residues (BR-A and BR-B) generated from urban and agricultural waste and nondigested cattle slurry (CS) applied at rates corresponding to 70 kg NH4+-N ha(-1). Total N2O-N losses from the sandy soil were higher after amendment with BR-B (0.32 g N2O-N m(-2)) than BR-A or CS (0.02 and 0.18 g N2O-N m(-2), respectively). In the clay soil, N2O-N losses were very low for CS (0.02 g N2O-N m(-2)) but higher for BR-A and BR-B (0.25 and 0.15 g N2O-N m(-2), respectively). In the organic soil, CS gave higher total N2O-N losses (0.31 g N2O-N m(-2)) than BR-A or BR-B (0.09 and 0.08 g N2O-N m(-2), respectively). Emission peaks differed considerably between soils, occurring on Day 1 in the organic soil and on Days 11 to 15 in the sand, whereas in the clay the peak varied markedly (Days 1, 6, and 13) depending on residue type. In all treatments, NH4+ concentration decreased with time, and NO3- concentration increased. Potential ammonium oxidation and potential denitrification activity increased significantly in the amended sandy soil but not in the organic soil and only in the clay amended with CS. The results showed that fertilization with BR can increase N2O emissions and that the size is dependent on the total N and organic C content of the slurry and on soil type. In conclusion, the two types of BR and the CS are not interchangeable regarding their effects on N2O production in different soils, and, hence, matching fertilizer type to soil type could reduce N2O emissions. For instance, it could be advisable to avoid fertilization of organic soils with CS containing high amounts or organic C and instead use BR. In clay soil, however, the risk of N2O emissions could be lowered by choosing a CS.

  • 10.
    Adasevic, Ivan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Industrial Economics and Organisation.
    Palosaari, Viljam
    Mälardalen University, School of Business, Society and Engineering, Industrial Economics and Organisation.
    Multi-project Management in an Internal Development Context: A case study focused on identifying challenges in project portfolio management at ABB Components2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis was to explore what challenges are identified in project portfolio management (PPM) in an internal multi-project environment. The aim of this study was to find the underlying reason for the occurrence of challenges in terms of how these challenges occur, and why do they occur. To realize the purpose and the aim of the study, the research was conducted at ABB Components, a business unit of ABB Group. Further, based on identified challenges provide a set of guidelines and recommendations for managing and countering the challenges.

    To understand the research problem a literature review was employed and a case study was conducted at ABB Components. The purpose of the literature review was to gain a theoretical background related to the research topic, identify challenges or problems, and potential solutions, with the purpose of establishing a connection to the challenges identified in the case study. The empirical work consisted of the case study conducted at ABB Components and was constituted by interviews person. The analysis of the results was validated with a workshop held with interviewees, with discussions regarding the findings. Guidelines and recommendations for managing challenges related to project portfolio management were designed from the results of empirical and theoretical work.

    The 11 main challenges related to project portfolio management were identified throughout three defined project phases, initiation of a project, execution of a project and project closure, and was appearing either in one phase or across phases. The challenges in this research were correlated to four main causes; limited resources (budget & time), limited resources (personnel), vague directives, and project maturity. The identified challenges can be encountered and managed by utilizing existing models for project management, improved information handling, expanding the notion of criteria for project success, performing a resource capacity analysis, and planning for the project closure.

    The theoretical and practical work have contributed to a collective analysis of what types of challenges are evident in phases throughout a single project, and what outcomes these challenges can have on a project portfolio in an internal multi-project environment and . It has to some extent indicated differences among challenges and causes evident in multi-project settings, for projects that are classified as internal development or product development, implicating differences throughout the project phase. Furthermore the challenges have pivoted around the three main themes centered indicating that there are challenges related to each phase of the project life, as well as challenges which are apparent across the project phases.

  • 11.
    Adasevic, Pavle
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Hallberg, Oskar
    Mälardalen University, School of Business, Society and Engineering.
    Revisorn och penningtvätt: - En studie om hur revisorer tillämpar lagen om penningtvätt2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Title: Accounting and money laundering, a study on how auditors apply the law on money laundering

    Date:  May 29th 2013

    University: Mälardalens University

    Institution: School of economy, society and technology

    Level: Bachelor thesis in business economy, 15 credits

    Authors: Pavle Adasevic 910731 Oskar Hallberg 900508

    Advisor: Kent Trosander

    Keywords: Money laundering, Law of money laundering, Auditor, ABL

    The main issue:In 2009 a new law on money laundering was introduced. The new law aims to strengthen the monitoring and reporting of money laundering. In 2011 11,464 reported suspicions of money laundering, only four of them where from audits, how come there so few reports from the auditors?

    Purpose: The Purpose of the study is to show how audits apply the new money laundering law in their work.

    Method: The study was based upon qualitative method. Secondary data was taken from literature, articles and reports. Primary data are interviews with three respondents, two auditors and one person from the financial police.

    Conclusion: The study shows that auditors apply the law in their work. Although the Money Laundering law can be regarded as clear and applicable thou the design however can be discussable. A hypothesis of a new concept that has been discovered from the study is companysmurfing.

  • 12.
    Adenfelt, Maria
    et al.
    Uppsala universitet.
    Maaninen-Olsson, Eva
    Mälardalen University, School of Business, Society and Engineering.
    Knowledge integration in a multinational setting: a study of a transnational business project2009In: International Journal of Knowledge Management Studies, ISSN 1743-8268, E-ISSN 1743-8276, Vol. 3, no 3-4, p. 295-312Article in journal (Refereed)
    Abstract [en]

    The purpose of this paper is to study how communication enables knowledge integration within transnational projects. Using longitudinal case study data to explore the theoretical arguments, interesting findings emerge. The main finding is that knowledge integration within the transnational project was hampered by ignorance – among project managers and members – of the impact and link between the use of different communication tools, subsequent communication process and knowledge integration. Other findings relate to how institutionalised behaviour persist change and subsequently partly explained why the communication process and thereto related communication tools were not adjusted to new circumstances and conditions. Finally, communication is an inherent part of knowledge integration within a transnational project and there is a need for communication to be sensitive to the complexity of the knowledge being integrated.

  • 13. Adolfsson, Petra
    et al.
    Dobers, Peter
    Mälardalen University, School of Business, Society and Engineering.
    Jonasson, Mikael
    Closing words!2009In: Guiding and guided tours / [ed] Adolfsson, P., Dobers, P. & Jonasson, M., Göteborg: BAS Publishers , 2009, p. 215-217Chapter in book (Other academic)
  • 14. Adolfsson, Petra
    et al.
    Dobers, PeterMälardalen University, School of Business, Society and Engineering.Jonasson, Mikael
    Guiding and guided tours2009Collection (editor) (Other academic)
  • 15. Adolfsson, Petra
    et al.
    Dobers, Peter
    Mälardalen University, School of Business, Society and Engineering.
    Jonasson, Mikael
    Introduction – Guiding and guided tours2009In: Guiding and guided tours / [ed] Adolfsson, P., Dobers, P. & Jonasson, M., Göteborg: BAS Publishers , 2009, p. 15-28Chapter in book (Other academic)
  • 16.
    Ahmadzade, Peyman
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Sathianbun, Sarayut
    Mälardalen University, School of Business, Society and Engineering.
    Vidhäftning mellan prefabelement och pågjutningsbetong: Undersökning hur skrovligheten påverkar vidhäftningskapaciteten vid skjuvning2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Self-compacting concrete has soon been around for a decade. Recently the prefabrication industry has started to use this fairly new concrete type in larger scales, mainly because of its distinctive properties.  There are still certain areas that need to be thoroughly examined, such as bond capacity. There have been very few studies regarding shear capacity due to the fact that the procedure is complicated.

    This report will highlight a method to examine the shear capacity of different surfaces that have been prewetted as well as non-prewetted surfaces. The surface areas follow BBK 04’s and Eurocode 2’s demand for surface roughness.  A smooth surface will be completed in order to confirm if the different shapes influence the bond strength by shear stress or not.                       

    The purpose of this essay is to measure the bond strength within the shear capacity as well as examine the impact it has on surface roughness and treatment for shear bond.

    The method used to identify the shear capacity is called L-shaped Push-Off Test. The dimension of the object was selected with the help of a previous research paper. The Sand-Patch method is predominantly used to measure the surface roughness. 

    The results showed no difference between the demands of surfaces of BBK04 and Eurocode 2 considering the shear capacity. However the non-prewetted surface was measured with the highest shear capacity value. Apart from the shear strength, deformation was measured in both vertical and horizontal direction and it was clearly shown that the vertical deformation was measured to be ten times higher than the horizontal deformation.  There was no difference between the BBK 04 and Eurocode 2 considering the vertical deformation. However the difference occurred on the horizontal direction between BBK 04 and Eurocode 2 where the specimens of Eurocode 2 received three times higher deformation compared to BBK 04. The conclusion can be drawn that the surface roughness of BBK 04 would be more suitable than eurocode2 considering deformation.     

    The overall result was that the surface treatment with the demands of BBK 04 and Eurocode 2 showed minor difference after being measured with the Push-Off Test method. This has been confirmed with the estimated shear capacity (1.2 MPa). The results revealed that the treatment of surface could be made in either way, brush or rake. As a conclusion the assessment of the shear strength showed that Eurocode 2's demand is too strict comparing demands of BBK 04.

  • 17.
    Ahmed, Ismail
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Peksen, Ismail
    Mälardalen University, School of Business, Society and Engineering.
    Projektledarens färdväg mot kompetensutveckling: En analys av projektledarkompetens och planeringsverktyg hos JM AB2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A project manager's responsibility in a project is to lead the project to specified goals with defined specifications. These goals must be achieved within a time related and economic framework. To achieve these goals, a project manager needs to early plan and implement a financial plan for the project. If the project manager lacks sufficient competence it may result in financial losses and failed project.  The present thesis was accomplished in collaboration with the construction company, JM AB, and the study consists of three parts. An extensive literature review has been conducted in which the theoretical perspective around the project have been analyzed. Interviews with project managers and site visits were conducted in order to achieve a deeper understanding of how JM works with timetables and existing competency development plans. The study shows that the project manager at JM AB is primarily involved in the early stages and the final stage of the project planning. Furthermore, this thesis showed that the project manager's skills development first of all takes place in daily work. In addition, the results showed that experience from previous work constitutes the most important skills development for the project managers and that activities such as formal courses also a contribute to stronger competence for the project manager.

  • 18.
    Ahmed, Sayidali
    Mälardalen University, School of Business, Society and Engineering.
    Kompetensutveckling i projektledning: En kompetensutvecklingshandbok för projektingenjörer2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis presents a study of competence and knowledge needs of project engineers to be able to manage projects successfully. The aim of the thesis is to identify how to feedback competences and experiences into the project management process. The guidebook provides guidance to what a project engineer needs to focus on to become more skilled and to become a more effective project manager.

    A literature study was performed to get a better understanding of the project manager's role. A detailed study was performed on the duties of project engineers and project managers. The literature study was based on books and reports as well as an information research by the Internet. An interview with five project managers and five project engineers was conducted to compare theory with practice. Based on the respondents' answers and the results from the literature study a handbook outlining what the project engineer can do to improve their project management skills.

    The thesis concludes that competence development depends on individual motivation. Every individual have their own goals and they are stimulated by different motivational factors. Some aims high to become CEO for a company, while other are satisfied with their positions and it doesn’t mean that all project engineer / project manager strives for continuous development.

    The main question of the thesis was: "What skills are needed for project engineers to develop their skills in project management?”. The results of the thesis show that without learning from their mistakes and problems that were made in previous project and by making their own mistakes the project engineer will not develop or become a more efficient project manager. By learning from experiences from previous projects the project engineer can save significant time when facing similar problems in new projects. Recording and using this knowledge may contribute to more effective solutions and thus reducing time lost unnecessarily.

  • 19.
    Ahmed, Shehzad
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Moosavi, Zahra
    Mälardalen University, School of Business, Society and Engineering.
    Factors Influencing the Cell Phone Brand Loyalty of Swedish Generation Y.2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 20.
    Akbari, Keramatollah
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Simulation of Indoor Radon and Energy Recovery Ventilation Systems in Residential Buildings2015Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This study aims to investigate the effects of ventilation rate, indoor air temperature, humidity and using a heat recovery ventilation system on indoor radon concentration and distribution.

    Methods employed include energy dynamic and computational fluid dynamics simulation, experimental measurement and analytical investigations. Experimental investigations primarily utilize a continuous radon meter and a detached house equipped with a recovery heat exchanger unit.

    The results of the dynamic simulation show that the heat recovery unit is cost-effective for the cold Swedish climate and an energy saving of about 30 kWh per  floor area per year is possible, while it can be also used to lower radon level.

    The numerical results showed that ventilation rate and ventilation location have significant impacts on both radon content and distribution, whereas indoor air temperature only has a small effect on radon level and distribution and humidity has no impact on radon level but has a small impact on its distribution.

  • 21.
    Akbari, Keramatollah
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Mahmoudi, Jafar
    Mälardalen University, School of Business, Society and Engineering.
    Ghanbari, M.
    Sharif University of Technology, Tehran, Iran .
    Simulation of ventilation effects on indoor radon2013In: Management of environmental quality, ISSN 1477-7835, E-ISSN 1758-6119, Vol. 24, no 3, p. 394-407Article in journal (Refereed)
    Abstract [en]

    Purpose: The purpose of this paper is to describe the use of computational fluid dynamics (CFD) to simulate indoor radon distribution and ventilation effects. This technique was used to predict and visualize radon content and indoor air quality in a one-family detached house in Stockholm. The effects of intake fans, exhaust fans and doors on radon concentration were investigated. Design/methodology/approach: In this study a mechanically balanced ventilation system and a continuous radon monitor (CRM) were used to measure the indoor ventilation rate and radon levels. In a numerical approach, the FLUENT CFD package was used to simulate radon entry into the building and ventilation effects. Findings: Results of the numerical study indicated that indoor pressure created by ventilation systems and infiltration through doors or windows have significant effects on indoor radon content. The location of vents was found to affect the indoor radon level and distribution. Research limitations/implications: It may be possible to improve any discrepancies found in this article by using a more refined representation of grids and certain boundary conditions, such as pressure and temperature differences between inside and outside and by considering some real situations in residential buildings and external situations. Originality/value: From the viewpoints of indoor air quality (IAQ) and energy savings, ventilation has two opposing functions; on the positive side it enhances IAQ and the establishment of thermal comfort, and on the negative side it increases energy consumption. This paper describes the search for a solution to cope with this contradiction.

  • 22.
    Akbari, Keramatollah
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Mahmoudi, Jafar
    Mälardalen University, School of Business, Society and Engineering.
    Öman, Robert
    Mälardalen University, School of Business, Society and Engineering.
    Simulation of ventilation effects on indoor radon in a detached house2012In: WSEAS Transactions on Fluid Mechanics, ISSN 1790-5087, Vol. 7, no 4, p. 146-155Article in journal (Refereed)
    Abstract [en]

    CFD is widely used in indoor air quality, air flow pattern, indoor pollutant distribution and thermal comfort as a cost effective and powerful tool and it can be used to predict, estimate and visualize the indoor radon level. The intention of this article is to use computational fluid dynamics (CFD), as a standalone tool to simulate indoor radon distribution and ventilation effects. This technique can be used to predict and visualize radon content and indoor air quality throughout a one family detached house in Stockholm. In this study a mechanical balanced ventilation system and a continuous radon monitor (CRM) were also used to measure the indoor ventilation rate and radon levels. In numerical approach the FLUENT, CFD package was used to simulate radon entry into the building and ventilation effects. Results of numerical study indicated that indoor pressure made by means of ventilation systems and infiltration through door or window has significant effects on indoor radon content. It is observed that the location of vents can affect the indoor radon level, particularly in breathing (seating) zone. The analytic solution is used to validate numeric results at 3 distinct air change rates. The comparison amongst analytical, numerical and measurement results shows close agreement.

  • 23.
    Akbari, Keramatollah
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Oman, Robert
    Mälardalen University, School of Business, Society and Engineering.
    Impacts of heat recovery ventilators on energy savings and indoor radon level2013In: Management of environmental quality, ISSN 1477-7835, E-ISSN 1758-6119, Vol. 24, no 5, p. 682-694Article in journal (Refereed)
    Abstract [en]

    Purpose: This paper aims to investigate the impact of heat recovery ventilators (HRVs) on the energy use and indoor radon in a one family detached house. Heat recovery ventilation systems, because of reducing ventilation loss through recovered exhaust air, can play a good role in the effectiveness of ventilation to reduce energy use. In addition HRVs can maintain pressure balance and outdoor ventilation rate at a required level to mitigate indoor radon level. Design/methodology/approach: In this study, a multizone model of a detached house is developed in IDA Indoor Climate and Energy (IDA ICE 4.0). The model is validated using measurements regarding use of energy for heating, ventilation and whole energy use. The performance of the heat recovery ventilation system is examined with respect to radon mitigation and energy saving by measuring the radon concentration and analyzing the life cycle cost of a heat exchanger unit. Findings: The results of the measurements and dynamic simulation showed that the heat recovery ventilation system could lead to 74 per cent energy savings of the ventilation loss, amounting to about 30 kWh m-2 per year. Life cycle cost analysis used for assessing total costs and the result showed that using this system is quite cost-effective and investment would payback during 12 years. Research limitations/implications: Limitations of this study generally refer to radon measurement and simulation because of radon complex behavior and its high fluctuations even during short periods of time. Practical implications: Heat recovery ventilation systems with reducing radon concentration improve indoor air quality and decrease environmental problems with energy savings. Social implications: Using balanced heat recovery ventilation can have benefits from the viewpoint of environmental impacts and household economy. Originality/value: Employment of a heat recovery unit to control indoor radon level is a new usage of this technology which along with energy savings can improve sustainable development.

  • 24.
    Akyildiz, Timur
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Willenius, Tobias
    Mälardalen University, School of Business, Society and Engineering.
    CSR ( Corporate social responsibility): En studie om hur H&M:s kunder upplever företagets kommunikation av CSR på den inhemska marknaden.2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 25.
    Al Hamrani, Emad
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Gibrael, Nemir
    Mälardalen University, School of Business, Society and Engineering.
    Fast determination of fuel/feedstock material properties and composition: By Near infrared (NIR) spectroscopy2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 26.
    Al Hamrani, Emad
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Grönberg, Nils
    Mälardalen University, School of Business, Society and Engineering.
    Sustainable flue-gas quench: For waste incineration plants within a water-energy-environment nexus perspective2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The function of a flue-gas quench is to remove additional contaminants from flue-gas and to reduce the wastewater from a waste incineration plant. The aim of this degree project is to find how the system is affected by using a quench and what factors limits the performance. This is done by modelling and simulating a waste incineration plant in Aspen Plus. Data and plant schematics were obtained by a study visit to Mälarenergi Plant 6 situated in Västerås, Sweden, which were used as model input and for model validation. The results have shown that the amount of wastewater can be reduced by more than half compared to a plant without a quench. The heat produced in the condenser, when discharging water to the boiler, would be lowered by up to 20%. For systems with a quench present when more water was discharged to the boiler both the heat production and the pollutant capturing became better. However, the system has limits regarding the amount that could be recirculated, in the form of temperature limits in different parts of the system. In addition, if the heat load is low there is an insufficient amount of wastewater generated in the condenser to run the quench. In that situation, clean (fresh) water needs to be used instead. Using clean water is unwanted since the plant will then consume more resources while still producing less heat than a plant without a quench would.

  • 27.
    Al-Bawi, Abbas
    Mälardalen University, School of Business, Society and Engineering, Industrial Economics and Organisation.
    Spare parts management potential in production sector2015Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    Spare parts management (SPM) is an important branch of management which could lead the company to success or bankruptcy. It is also fill of potential improvements that can increase the company profits, productivity, and reliability. Wise inventory management would eliminate all the delay risks of unplanned breakdowns, and reduce process time and cost. 

    To understand the importance of the spare parts, a fundamental knowledge of maintenance types, spare parts, spare parts management, spare parts classifications, ABC analysis, Economic order quantity, suppliers’ management, purchase management, and management computer program SAP, have been viewed.

    Companies realize the spare parts importance and try to develop the system to increase the benefits. Many ways has been taken to achieve that. Each company has it is own management system that the company has developed in years.

    In this research, spare parts management system of seven companies has been studied. By comparing of the management systems, we highlight the areas that would have negative or positive impact on the system. We would also analysis why the companies have chosen these systems, how they develop the system, and where they aim throw the development.

    Reviewing case studies would have many advantages, it would expand the vision to develop the management system and focus on the points that have permanent value instead of focus on temporary improvement.

    Two check lists of points that could have potential improvement, have been presented and in which improvement type.

  • 28.
    Ali, Muhamad Sarmad
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Siddiqui, Khurram
    Exchanges in a Not For Profit Organization: A Case Study Of Green Voluntee2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This case study deals with the identification and description of exchanges that occur in a not for profit organization, in our case is the Green Volunteers, and how these exchanges are essential for the achievement of their objectives. This thesis provides a basic framework for understanding and analyzing existing exchanges for future researchers.

  • 29.
    Alisic, Amel
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Gustavsson, Carl-Henrik
    Mälardalen University, School of Business, Society and Engineering.
    Sassi, Alexander
    Mälardalen University, School of Business, Society and Engineering.
    DEN ÖKADE E-HANDELNS PÅVERKAN PÅ FYSISKA BUTIKER: En studie inriktad på kundrelationer inom elektronikbranschen2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 30.
    Alkefjärd, Tobias
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Kasemi, Anton
    Mälardalen University, School of Business, Society and Engineering.
    Ren eller oren revisionsberättelse: En kvantitativ studie om sambandet mellan revisionsarvodets storlek och ren/oren revisionsberättelse2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Research question: Does the audit fee size effect an auditor’s tendency to submit an unqualified or qualified audit report, if is so, how?

    Purpose: The purpose of this study is to extend previous research conducted on this topic by examining whether an auditor’s tendency to give an unqualified or qualified audit report is affected by the audit fee size, if is so, how?

    Method: The study is based on a quantitative method in which the primary data is taken from the database Retriever and comprises 300 annual reports from the year 2009, which belong to Vastmanland´s micro- company financial statement. The study also applied a deductive approach, which meant that secondary data in the shape of established theories and also previous research on the subject was the basis for the creation of the study´s hypotheses. After the collection of primary data, the data was compiled in Microsoft Excel and then the data was analyzed using bivariate- and multivariate logistic regression analysis in SPSS.

    Conclusion: In the bivariate logistic regression analysis we found that there is no significant relation between the size of the audit fee and an auditor's tendency to give an unqualified or qualified audit report. On the other hand a positive significant relationship between these variables was found in the multivariate logistic regression analysis. The results of the multivariate logistic regression analysis can be interpreted that as a higher audit fee provides a greater probability that an auditor issues a qualified audit report. The study also shows that extensive efforts and lack of financial resources in the form of internal control may be associated with an auditor submits a qualified audit report and receives high audit fee.

  • 31.
    Al-Mosawy, Jaser
    Mälardalen University, School of Business, Society and Engineering.
    Strukturering av information vid modellering (BIP & BSAB): Tillämpning av klassifikations och märkningssystem i programvara (Tekla Structures)2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A construction project can be compared to a triathlon where the building process takes place in three stages and participants try to finish three sub processes as fast as possible to reach the goal. After the first stage is finished, the next begins to eventually jointly meet the milestones that are set on the road. There are many different players in a building process where everyone can have completely different tasks and work in completely different locations around the world. This require that the information between the different parties must be correct and shared to avoid delays and unnecessary costs.

    Identifying, defining and structuring of information in the 3D-model reflects an organized approach where all information is available in the same location. The development in the construction industry has given the opportunity to let the information supply to be almost unlimited. BIM stands for Building Information Modeling, in design/construction models there is room for the construction industry to improve the efficiency and quality at much higher altitudes. Two systems that have grown during the BIM development is the BIP (Building Information Properties) and BSAB 2.0 (Bygg Samordning AB 2.0) which is designation and classification system in Sweden that aims to become the solution for a joint system for all construction companies. This would lead to that, information delivery becomes waterproof.

     This report is a study of how a common system can be applied to the accounting of the various construction companies to be similar and flawless. The lineup of solutions in the examination are solutions for the modeling software Tekla Structures. There is also an investigation of how the mapping of a complete system that allows the different parties in the construction process to use the same terms throughout the different sub processes.

  • 32.
    Al-sumasum, Rawia
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Faías Ponce, Lara
    Mälardalen University, School of Business, Society and Engineering.
    ÅTERANVÄNDBARA PARKERINGSHUS: En studie om att utveckla konceptet TempoDeck2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In today’s situation new methods are constantly evolving in the construction industry where the sustainability of a construction is of utmost importance. Prefabricated concrete is a type material that is highly durable in terms of long life without producing damaging effects. As a result, the material has been used increasingly in the manufacture of construction. Construction industry is continuously developing, which means new ways to construct buildings. Within construction, usage of prefabricated concrete is a method that has become increasingly successful. With this method, the construction period is shortened considerably and the construction process will be more beneficial for the environment and the various safety aspects. This master thesis was written in cooperation with AB Strängbetong, is one of the largest companies in Sweden that uses prefabricated elements. The company has a concept called TempoDeck and is currently building a parking garage in Ullared, with the life with a life expectancy of 50 years, that is life class L50. The objective of the study was to check whether the construction work fulfilled the requirements of the standards. In addition, the purpose was also to investigate the possibility of a different type of facade design by reducing the height of the joists and beams. The thesis includes a literature review, a case study, an archive analysis as well as calculations with the Norwegian program E – bjelke. A guidance from AB Strängbetong has also been used. The results showed that the existing structure fulfilled the life class L50 according to the requirements. In addition, the results showed that it was aesthetically possible to modify the car park, to make it more appealing. However, it would be more profitable to keep the design as it is to the future constructions. 

  • 33.
    Alvarsson, Rebecka
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Bodare, Olivia
    Mälardalen University, School of Business, Society and Engineering.
    Syns klimatsmart mat i konsumenters varukorgar?: En studie om ICA Sveriges konsumenters beteende och förhållande till klimatsmarta livsmedel2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose is to investigate whether a grocery operator’s communication of its CSR activities on climate issues has influenced consumers to a changed behaviour regarding food purchases. The study is based on previous studies and scientific articles. A qualitative and quantitative method has been used during the collection of primary data, conducted through a survey based on ICA Sweden AB’s consumers, and with an interview with a representative from ICA Sweden AB. It was discovered that the majority of the consumers purchases climate-smart food based on their attitude. However, ICA Sweden AB does not affect the consumers to make purchases of climatesmart food. Nevertheless, they provide a wide range of climatesmart food that encourage consumers to do so.

  • 34.
    Alvehus, Johan
    et al.
    Lund University, Sweden.
    Crevani, Lucia
    Mälardalen University, School of Business, Society and Engineering, Industrial Economics and Organisation.
    Micro-ethnography and closed vignettes: Eight propositions for fieldwork and write-work in multimodal leadership studies2018In: Co-Lead workshop 2018, 2018Conference paper (Refereed)
  • 35. Ambos, T.C.
    et al.
    Andersson, Ulf
    Mälardalen University, School of Business, Society and Engineering.
    Birkinshaw, J.
    The Consequences of Subsidiary Entrepreneurship2008Chapter in book (Refereed)
  • 36.
    Amin, Asad
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Shahid, Muhammad Imran
    Mälardalen University, School of Business, Society and Engineering.
    INFLUENCE OF LANGUAGE ON KNOWLEDGE SHARING: A CASE STUDY OF PAKISTANI WORKERS IN SELECTED SWEDISH MULTINATIONAL COMPANIES2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 37.
    Amin, Mahgol
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Kubo, Tomomi
    Mälardalen University, School of Business, Society and Engineering.
    KANBAN Implementation from a Change Management Perspective: A Case Study of Volvo IT2014Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to investigate and analyze the implementation process of KANBAN, a lean technique, into a section of Volvo IT (i.e. BEAT). The KANBAN implementation into BEAT when ‘resistance for change’ and ‘forces for change’ arise is also analyzed. This implementation of KANBAN is equivalent to change taking place in the Volvo IT’s operational process. The thesis follows theories and literature on change management and lean principles in order to support the research investigation.

    How has KANBAN, with respect to change management, been implemented into an IT organization for its service production? How has KANBAN changed the operational process of the organization?

     The research conducted in the thesis is based on qualitative case study. Focused and in-depth interviews, combined with observations, are carried out to obtain the primary data for the case study. The collected primary and secondary data stems from the literature reviewed, which covers the lean principles, KANBAN, and change management. Moreover, the thesis adopts an abductive approach that goes back-and-forth between the theory and the empirical findings in order to develop a model.

    Due to various factors already existing in the BEAT, minimal resistance to change implementation was found to be present in Volvo IT. This finding indicates that change initiatives found a way to implementation because the predominance of the ‘forces for change’, as compared to, the ‘resistance to change’ is higher in BEAT. The KANBAN implementation into the IT service production is identified to be aligned with Volvo IT’s change implementation objectives. The visualization of the ‘intangible service’ workflow on the Kanban board contributes to identify the source of bottlenecks, which has been removed through effective communication in the BEAT team and better linkages between tasks. The KANBAN effectively deals with change implementation by modifying the way team members work.

  • 38.
    An, Lin
    et al.
    E China Univ Sci & Technol, Peoples R China.
    Yu, Xinhai
    E China Univ Sci & Technol, Peoples R China.
    Yang, Jie
    Univ Shanghai Sci & Technol, Shanghai, Peoples R China.
    Tu, Shan-Tung
    E China Univ Sci & Technol, Peoples R China.
    Yan, Jinyue
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. Royal Inst Technol, Stockholm, Sweden.
    CO2 capture using a superhydrophobic ceramic membrane contactor2015In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 75, p. 2287-2292Article in journal (Refereed)
    Abstract [en]

    Wetting and fouling of membrane contactor result in performance deterioration of membrane gas absorption system for CO2 post-combustion capture of coal-fired power plants. To solve these problems, in this study, a superhydrophobic ceramic (SC) membrane contactor was fabricated by chemically modification using 1H, 1H, 2H, 2H-perfluorooctylethoxysilane (FAS) solution. The membrane contactor fabrication costs for both SC membrane and PP (polypropylene) membrane contactors per unit mass absorbed CO2 were roughly the same. However, by using the SC membrane, the detrimental effects of wetting can be alleviated by periodic drying to ensure a high CO2 removal efficiency (>90%), whereas the drying does not work for the PP membrane. The SC membrane contactor exhibited a better anti-fouling ability than the PP membrane contactor because the superhydrophobic surface featured a self-cleaning function. To ensure continuous CO2 removal with high efficiency, a method that two SC membrane contactors alternatively operate combined with periodic drying was proposed.

  • 39.
    Anbalagan, Anbarasan
    Mälardalen University, School of Business, Society and Engineering.
    A passage to wastewater nutrient recovery units: Microalgal-Bacterial bioreactors2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In recent years, the microalgal–bacterial process has been considered to be a very attractive engineering solution for wastewater treatment. However, it has not been widely studied in the context of conventional wastewater treatment design under Swedish conditions. The technology holds several advantages: as a CO2 sink, ability to withstand cold conditions, ability to grow under low light, fast settling without chemical precipitation, and reducing the loss of valuable nutrients (CO2, N2, N2O, PO4). The process also provides the option to be operated either as mainstream (treatment of municipal wastewater) or side stream (treatment of centrate from anaerobic digesters) to reduce the nutrient load of the wastewater. Furthermore, the application is not only limited to wastewater treatment; the biomass can be used to synthesise platform chemicals or biofuels and can be followed by recovery of ammonium and phosphate for use in agriculture.

    In the present study, the feasibility of applying the process in Swedish temperature and light conditions was investigated by implementing microalgae within the activated sludge process. In this context, the supporting operational and performance indicators (hydraulic retention time (HRT), sludge retention time (SRT) and nutrients removal) were evaluated to support naturally occurring consortia in photo-sequencing and continuous bioreactor configuration. Furthermore, CO2 uptake and light spectrum-mediated nutrient removal were investigated to reduce the impact on climate and the technical challenges associated with this type of system.

    The results identified effective retention times of 6 and 4 days (HRT = SRT) under limited lighting to reduce the electrical consumption. From the perspective of nitrogen removal, the process demands effective CO2 input either in the mainstream or side stream treatment. The incorporation of a vertical absorption column demonstrated effective CO2 mass transfer to support efficient nitrogen and phosphorus removal as a side stream treatment. However, the investigation of a continuous single-stage process as the mainstream showed a requirement for a lower SRT in comparison to semi-continuous operation due to faster settlability, regardless of inorganic carbon. Furthermore, the process showed an effective reduction of influent phosphorus and organic compounds (i.e. COD/TOC) load in the wastewater as a result of photosynthetic aeration. Most importantly, the operation was stable at the temperature equivalent of wastewater (12 and 13 ˚C), under different lighting (white, and red-blue wavelengths) and retention times (6 and 1.5 d HRT) with complete nitrification. Additionally, the biomass production was stable with faster settling properties without any physiochemical separation.

    The outcomes of this thesis on microalgal–bacterial nutrient removal demonstrates that (1) photosynthesis-based aeration at existing wastewater conditions under photo-sequential and continuous photobioreactor setup, (2) flocs with rapid settling characteristics at all studied retention times, (3) the possibility of increasing carbon supplementation to achieve higher carbon to nitrogen balance in the photobioreactor, and (4) most importantly, nitrification-based microalgal biomass uptake occurred at all spectral distributions, lower photosynthetic active radiation and existing wastewater conditions.

    The full text will be freely available from 2018-05-29 08:00
  • 40.
    Anbalagan, Anbarasan
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Indigenous microalgae-activated sludge cultivation system for wastewater treatment2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The municipal wastewater is mainly composed of water containing anthropogenic wastes that are rich in nutrients such as carbon, nitrogen and phosphorous. The cost for biological treatment of wastewater is increasing globally due to the population growth in urban cities. In general, the activated sludge (AS) process is a biological nutrient removal process used in wastewater treatment plants (WWTPs). The AS is composed of different microorganisms in which bacteria play a crucial role in wastewater treatment (WWT). During the process, air is bubbled to supply oxygen and methanol is added to improve nitrogen removal, which is released as a gas. Phosphorous is removed in the expense of precipitation chemicals. Altogether, the current process requires electrical energy, precipitation chemicals, handling of excess sludge and it emits carbon dioxide (CO2) as a by-product. This process is still in practise in the WWTPs since 1914 although numerous modifications are implemented to meet the stringent regulations in the European Union and globally.

    Microalgae are microorganisms that perform photosynthesis like plants. They are green and reproduce fast using available nutrients (nitrogen and phosphorous) and CO2 from their environment in the presence of light. As a result of photosynthesis, oxygen is released as waste gas. The synthesised oxygen during this process can be implemented to support the AS bacteria that leads to the microalgae activated sludge (MAAS) process. The main advantage is combined removal of nutrients.

    The vision of the research is to implement the indigenous microalgae cultivation in activated sludge process to consume CO2 and recover the nutrients from wastewater. This study is performed to improve the understanding of the process such as: light utilisation, nutrient removal and recovery of the biomass from wastewater in closed photo-bioreactors. Photo-bioreactors are vessels where the cultivation is carried out in the presence of light. At first, the influence of the light spectrum on micro-algal cultivation is investigated for photosynthetic growth. This is followed by operational challenges of the microalgae cultivation during the AS process. The process is experimentally performed in the photo-bioreactors with different treatment time of the raw wastewater. The results showed that 2 - 6 days of treatment time can be used for reducing nutrients in wastewater if the process is optimised further. Also, nutrient ratio is analysed for the availability of the micro-algal growth. Furthermore, the biogas potential of MAAS showed a biogas yield of about 60-80% within 5 to 9 days.

    At last, the experimental verification of chemically precipitated wastewater showed limitation of phosphorous for micro-algal growth. Additionally, the optimal oxygen supply through light response is verified for photo-bioreactors. The outcome of this study shows that knowing the right conditions can lower the treatment time. By doing so, a stable nutrient removal and reduction of precipitation chemicals can be established as well as a better recovery of valuable nutrients as phosphorous and nitrogen.

  • 41.
    Anbalagan, Anbarasan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Jeanette Castro, Cynthia
    University of Massachusetts Amherst, US.
    Schwede, Sebastian
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Lindberg, Carl-Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. ABB AB Corporate Research, Sweden.
    Nehrenheim, Emma
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. Northvolt AB, Sweden.
    Butler, Caitlyn
    University of Massachusetts Amherst, US.
    Influence of environmental stress on the microalgal-bacterial process during nitrogen removalManuscript (preprint) (Other academic)
  • 42.
    Anbalagan, Anbarasan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Lindberg, Carl-Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Nehrenheim, Emma
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Influence of light intensity and phosphorous on microalgae activated sludge in phosphate precipitated conditionManuscript (preprint) (Other academic)
  • 43.
    Anbalagan, Anbarasan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Schwede, Sebastian
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Lindberg, Carl Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. ABB AB, Corporate Research, Västerås, Sweden.
    Nehrenheim, Emma
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Influence of hydraulic retention time on indigenous microalgae and activated sludge process2016In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 91, p. 277-284Article in journal (Refereed)
    Abstract [en]

    Integration of the microalgae and activated sludge (MAAS) process in municipal wastewater treatment and biogas production from recovered MAAS was investigated by studying the hydraulic retention time (HRT) of semi-continuous photo-bioreactors. An average total nitrogen (TN) removal efficiency (RE) of maximum 81.5 ± 5.1 and 64.6 ± 16.2% was achieved at 6 and 4 days HRT. RE of total phosphorous (TP) increased slightly at 6 days (80 ± 12%) HRT and stabilized at 4 days (56 ± 5%) and 2 days (55.5 ± 5.5%) HRT due to the fluctuations in COD and N/P mass ratio of the periodic wastewater. COD and organic carbon were removed efficiently and a rapidly settleable MAAS with a sludge volume index (SVI_10) of less than 117 mL g-1 was observed at all HRTs. The anaerobic digestion of the untreated MAAS showed a higher biogas yield of 349 ± 10 mL g VS-1 with 2 days HRT due to a low solids retention time (SRT). Thermal pretreatment of the MAAS (120 °C, 120 min) did not show any improvement with biogas production at 6 days (269 ± 3 (untreated) and 266 ± 16 (treated) mL gVS-1), 4 days (258 ± 11(untreated) and 263 ± 10 (treated) mL gVS-1) and 2 days (308 ± 19 mL (treated) gVS-1) HRT. Hence, the biogas potential tests showed that the untreated MAAS was a feasible substrate for biogas production. Results from this proof of concept support the application of MAAS in wastewater treatment for Swedish conditions to reduce aeration, precipitation chemicals and CO2 emissions. 

  • 44.
    Anbalagan, Anbarasan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Schwede, Sebastian
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Lindberg, Carl-Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. ABB AB.
    Nehrenheim, Emma
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Continuous microalgae-activated sludge flocs for remediation of municipal wastewater under low temperature2017In: / [ed] Peter Van der Steen, 2017, p. 1-8Conference paper (Refereed)
    Abstract [en]

    The operational performance of indigenous microalgae-activated sludge was evaluated regarding the nutrient removal efficiency using raw wastewater collected from Västerås wastewater treatment plant, Sweden at limited artificial surface lighting (290 μmol m-1 sec-1) and Nordic wastewater conditions (13°C). Additionally, the oxygen production and consumption, biomass concentration and its settling was evaluated during the symbiotic algal-bacterial interaction. The results confirmed oxygenic organic compound removal (COD removal of 65-94%) at higher (31-45 d) and lower (13-18 d) sludge retention time (SRT). Also, a complete removal of ammonium throughout the process and partial nitrite-nitrate removal at all SRTs (total nitrogen removal of 41- 62%) were observed. Likewise, a partial phosphorus (P)removal was observed in the effluent which provides an opportunity to capture free P fromthe effluent for recovery as fertiliser. Further, the microalgal growth was slower due to lightor inorganic carbon limitation or ammonium repression caused by higher internal recirculationas observed from ammonium and nitrite-nitrate levels in the PBR. Most importantly, effectivePBR biomass concentration based nutrient removal and relative sludge recirculation have tobe considered in the PBR design to avoid light limitation and activate symbiosis.

  • 45.
    Anbalagan, Anbarasan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Schwede, Sebastian
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Lindberg, Carl-Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. ABB AB, Corporate Research, Västerås, Sweden.
    Nehrenheim, Emma
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Influence of iron precipitated condition and light intensity on microalgae activated sludge based wastewater remediation2017In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, p. 1523-1530Article in journal (Refereed)
    Abstract [en]

    The indigenous microalgae-activated sludge (MAAS) process during remediation of municipal wastewater was investigated by studying the influence of iron flocculation step and light intensity. In addition, availability of total phosphorous (P) and photosynthetic activity was examined in fed-batch and batch mode under northern climatic conditions and limited lighting. This was followed by a semi-continuous operation with 4 d of hydraulic retention time and mean cell residence time of 6.75 d in a photo-bioreactor (PBR) with varying P availability. The fed-batch condition showed that P concentrations of 3–4 mg L−1 were effective for photosynthetic chl. a development in iron flocculated conditions. In the PBR, the oxygen evolution rate increased with increase in the concentration of MAAS (from 258 to 573 mg TSS L−1) at higher surface photosynthetic active radiation (250 and 500 μmol m−2 s−1). Additionally, the rate approached a saturation phase at low MAAS (110 mg L−1) with higher light intensities. Semi-continuous operation with luxury P uptake and effective P condition showed stable average total nitrogen removal of 88 and 92% respectively, with residual concentrations of 3.77 and 2.21 mg L−1. The corresponding average P removal was 68 and 59% with residual concentrations of 2.32 and 1.75 mg L−1. The semi-continuous operation produced a rapidly settleable MAAS under iron flocculated condition with a settling velocity of 92–106 m h−1 and sludge volume index of 31–43 ml g−1 in the studied cases.

  • 46.
    Anbalagan, Anbarasan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Schwede, Sebastian
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Nehrenheim, Emma
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Influence of light emitting diodes on indigenous microalgae cultivation in municipal wastewater2015In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 75, p. 786-792Article in journal (Refereed)
    Abstract [en]

    In this study, the effect of light emitting diodes (LEDs) on microalgae cultivation in municipal wastewater was examined in comparison to the fluorescent light. Two kinds of wastewater were evaluated: first one with low concentration of total phosphorous (TP) and second one with high TP concentration. The nutrient removal and biomass production using LEDs is efficient at photo-synthetically active radiation (PAR) intensity of 107-112 mu mol m(-2) s(-1) which is slightly higher than fluorescent light. Furthermore, this study demonstrates the applicability and distribution of light in wastewater where the environment is not defined. More importantly, winter and rainy periods contribute to dark condition and dilution of wastewater, intense LED light offers a feasible option for the functioning of closed micro algae based activated sludge (MAAS) process for recovery and reuse of nutrients. 

  • 47.
    Anbalagan, Anbarasan
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. University of Valladolid, Dr. Mergelina s/n, Valladolid, Spain.
    Toledo-Cervantes, A.
    University of Valladolid, Dr. Mergelina s/n, Valladolid, Spain.
    Posadas, E.
    University of Valladolid, Dr. Mergelina s/n, Valladolid, Spain.
    Rojo, E. M.
    University of Valladolid, Dr. Mergelina s/n, Valladolid, Spain.
    Lebrero, R.
    University of Valladolid, Dr. Mergelina s/n, Valladolid, Spain.
    González-Sánchez, A.
    University of Valladolid, Dr. Mergelina s/n, Valladolid, Spain.
    Nehrenheim, Emma
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Muñoz, R.
    University of Valladolid, Dr. Mergelina s/n, Valladolid, Spain.
    Continuous photosynthetic abatement of CO2 and volatile organic compounds from exhaust gas coupled to wastewater treatment: Evaluation of tubular algal-bacterial photobioreactor2017In: Journal of CO2 Utilization, ISSN 2212-9820, E-ISSN 2212-9839, Vol. 21, p. 353-359Article in journal (Refereed)
    Abstract [en]

    The continuous abatement of CO2 and toluene from the exhaust gas by an indigenous microalgal-bacterial consortium was investigated in a pilot tubular photobioreactor interconnected to an absorption column using diluted centrate in seawater as a free nutrient source. The removal efficiency of CO2 and toluene was maximised in the vertical absorption column by identifying an optimum liquid to gas (L/G) ratio of 15. The photobioreactor supported steady-state nitrogen and phosphorus removals of 91 ± 2% and 95 ± 4% using 15% diluted centrate at 14 and 7 d of hydraulic retention time (HRT), respectively. A decrease in the removal efficiencies of nitrogen (36 ± 5%) and phosphorus (58 ± 10%) was recorded when using 30% diluted centrate at 7 d of HRT. The volumetric biomass productivities obtained at an HRT of 7 d accounted for 42 ± 11 and 80 ± 3 mg TSS L-1 d-1 using 15 and 30% centrate, respectively. Stable CO2 (76 ± 7%) and toluene removals (89 ± 5%) were achieved at an L/G ratio of 15 regardless of the HRT or centrate dilution. Hence, this study demonstrated the potential of algal-bacterial systems for the continuous removal of CO2 and volatile organic compounds from exhaust gas coupled with the simultaneous treatment of centrate. 

  • 48.
    Andersen, Torben J
    et al.
    Copenhagen Business School, Denmark.
    Andersson, Ulf
    Mälardalen University, School of Business, Society and Engineering, Industrial Economics and Organisation.
    Multinational Corporate Strategy-making: Integrating International Business and Strategic Management2017In: The Responsive Global Organization: New Insightsfrom Global Strategy and International Business / [ed] Andersen, Torben J, Emerald Group Publishing Limited, 2017, 1, p. 13-33Chapter in book (Refereed)
    Abstract [en]

    This chapter contends that the international business (IB) and strategic management (SM) fields have many commonalities that should be considered in a turbulent globalized business context. IB studies refer to the need for local integration and local adaptation whereas empirics in SM pinpoint the complementary effects of central planning and decentralized decisionmaking. We present and synthesize these rather field specific perspectives and try to synthesize insights from both fields in an adaptive strategy-making model including the effects of autonomous subsidiary initiatives and intended mandates from corporate headquarters. The model considers local subsidiary actions of both operational and strategic nature and we argue that it may be futile to distinguish between these effects as incremental operational responses can cumulate into more substantial changes over time with dimensions of strategic adaptation. The model provides a foundation for further considerations about how to combine central intent and direction with decentralization and autonomous initiatives in the multinational corporation.

  • 49.
    Anderson, Helén
    et al.
    Linnaeus University.
    Dahlin, Peter
    Mälardalen University, School of Business, Society and Engineering, Industrial Economics and Organisation.
    Havila, Virpi
    Uppsala university.
    Holtström, Johan
    Linköping University.
    Öberg, Christina
    Örebro University.
    The Stake of Customers and Suppliers in Mergers and Acquisitions2016Conference paper (Refereed)
  • 50.
    Andersson, Amanda
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Brambeck, Maria
    Mälardalen University, School of Business, Society and Engineering.
    Edberg, Emelie
    Mälardalen University, School of Business, Society and Engineering.
    Commitment Issues: En kvantitativ studie om commitment i relationen mellan kund och bank2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Commitment Issues? – A quantitative study about commitment in the relationship between the customer and the bank 

    Research questions

    What is the customer perception of commitment in the relationship with the bank and online bank? How should the bank act to influence customer commitment? 

    Purpose

    The study aims to explore the concept of commitment in the relationship between the customer and the bank. The paper also examines the influence of trust, distrust and online banking on customer commitment and gives direction for how Swedish banks should conduct their business in order to build commitment. 

    Method

    In order to explore customers perceived commitment, a quantitative study was carried out using an online survey which was conducted by 1 265 Swedish speaking respondents. 

    Conclusion

    The perceived commitment is influenced by the relationship with the bank. It is influenced by the manner of communication, personalization has proven effective to show customers that their needs and interests are prioritized. Customers generally have a higher level of commitment when they feel valued by the bank. Trust is the main pillar in the relationship between the bank and the customer, which is the foundation of commitment. Distrust on the other hand increases the likelihood that the customer will switch to an other bank branch. The commitment to financial services online is closely related to the commitment to the bank branch. A strong commitment to the bank creates a strong commitment to the online bank, and vice versa. 

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