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  • 1. Abbaszadeh, A
    et al.
    Taherzadeh, Mohammad J.
    University of Borås, School of Engineering.
    Effect of extraction conditions on yield and purity of citrus pectin by sulfuric and hydrochloric acids2009Conference paper (Refereed)
  • 2. Abdon, Nils Johan
    et al.
    Bergfeldt, Lennart
    Herlitz, Johan
    University of Borås, School of Health Science.
    Hjärtstopp utlöst av läkemedel kanske vanligare än vi tror2010In: Läkartidningen, ISSN 0023-7205, E-ISSN 1652-7518, Vol. 107, no 8, 521-525 p.Article in journal (Refereed)
  • 3. Abdon, NJ
    et al.
    Herlitz, J
    University of Borås, School of Health Science.
    Andrersson, B
    Peripartumcardiomyopathi an often mised diagnosis2013In: Läkartidningen, ISSN 0023-7205, E-ISSN 1652-7518, Vol. 110, no 23-24, 1152-1154 p.Article in journal (Refereed)
    Abstract [sv]

    Peripartumkardiomyopati är en sällsynt form av hjärtsvikt. Diagnostiska kriterier är nytillkommen hjärtsvikt från sen graviditet och upp till fem månader efter förlossning, avsaknad av annan förklaring till hjärtsvikt och nedsatt systolisk vänsterkammarfunktion Orsaken till tillståndet tros vara omvandling av prolaktin till en kardiotoxisk variant. Terapin är den etablerade, men ACE-hämmare och ARB får inte ges till ammande mödrar. Hjärttransplantation har tillgripits. Maligna hjärtarytmier har krävt behandling med implanterbar defibrillator och pacemaker. Hämning av produktionen av prolaktin med bromokriptin har gett goda resultat i en liten studie. Resultaten har inte bekräftats.

  • 4.
    Abed, Samah
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Al-Kaisee, Farah
    University of Borås, Faculty of Textiles, Engineering and Business.
    Metallutvinning med fokus på zinkfrån avfallsflygaska med hjälp avsura processvatten2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden produces large amount of fly ash from waste combustion annually. Combustion the

    waste generates two types of ashes, bottom ash/slag, and fly ash. Bottom ash is considered to

    be more environmentally friendly and has a wide area of application such as road

    constructions on landfills. While the fly ash has high level of heavy metals and for instance

    dioxines which are harmful for the environment. This type of ash are deposited in a landfill

    and gets classified as a hazardous waste which is expensive given that the deposit fee is high.

    The fact that fly ash contains valuable metals as zinc, methods of recovering it are being

    developed such as acid leaching. This is a promising method as the leachate used are acid

    process water making the usage of the chemicals substantially lower which makes it

    financially viable.

    Waste incinerators in Sweden produce approximately 200 000 tons of fly ash annually and the

    majority of it is transfered to Norway to get treated and put on a landfill. Some waste

    management companies, e.g. Renova, are using another method called “the Bamberg method”

    where fly ash is mixed with sludge to form a cake and put in the company’s own landfill.

    The projects goal is to leach the fly ash by using acidic process water to obtain the metallic

    substance particularly zinc making it easier and cheaper to landfill the ash and also to

    optimize this method to get the most zinc out of the ash using minimum amount of the acidic

    process water (5% HCI).

    The laboratory work took place in the University of Borås. Fly ash and the acid process water

    which were used under the laboratory work was obtained from RenovaAB.

    The results shows that leaching the fly ash with acidic process water gave different release of

    zinc but was 88% at most. The variation in the results depends on a few factors such as

    amount of acidic process water, pH, time, blending time and the ashes content.

    This project took environment and access to acidic water in consideration, which optimized

    the method of using less amount of acid process water to get the most zinc as possible.

    The results shows that leaching fly ash with acid process water is cost efficient and easy way

    to recover zinc, which satisfy the goals of the project.

  • 5. Abedinifar, Sorahi
    et al.
    Karimi, Keikhosro
    University of Borås, School of Engineering.
    Khanahmadi, Morteza
    Taherzadeh, Mohammad J.
    University of Borås, School of Engineering.
    Ethanol production by Mucor indicus and Rhizapus oryzae from rice straw by separate hydrolysis and fermentation2009In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 33, no 5, 828-833 p.Article in journal (Refereed)
    Abstract [en]

    Rice straw was successfully converted to ethanol by separate enzymatic hydrolysis and fermentation by Mucor indicus, Rhizopus oryzae, and Saccharomyces cerevisiae. The hydrolysis temperature and pH of commercial cellulase and beta-glucosidase enzymes were first investigated and their best performance obtained at 45 degrees C and pH 5.0. The pretreatment of the straw with dilute-acid hydrolysis resulted in 0.72 g g (1) sugar yield during 48 h enzymatic hydrolysis, which was higher than steam-pretreated (0.60 g g (1)) and untreated straw (0.46 g g(-1)). Furthermore, increasing the concentration of the dilute-acid pretreated straw from 20 to 50 and 100 g L-1 resulted in 13% and 16% lower sugar yield, respectively. Anaerobic cultivation of the hydrolyzates with M. indicus resulted in 0.36-0.43 g g(-1) ethanol, 0.11-0.17 g g(-1) biomass, and 0.04-0.06 g g(-1) glycerol, which is comparable with the corresponding yields by S. cerevisiae (0.37-0.45 g g(-1) ethanol, 0.04-0.10 g g(-1) biomass and 0.05-0.07 glycerol). These two fungi produced no other major metabolite from the straw and completed the cultivation in less than 25 h. However, R. oryzae produced lactic acid as the major by-product with yield of 0.05-0.09 g g(-1). This fungus had ethanol, biomass and glycerol yields of 0.33-0.41, 0.06-0.12, and 0.03-0.04 g g(-1), respectively. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

  • 6.
    Abelli, Björn
    University of Borås, School of Business and IT.
    Directing and Enacting the Information System2007In: Advances in Information Systems Development - New Methods and Practice for the Networked Society. / [ed] W Wojtkowski, W. G. Wojtkowski, J. Zupancic, G. Magyar, G. Knapp, Springer US , 2007, 13-23 p.Chapter in book (Other academic)
  • 7.
    Abelli, Björn
    University of Borås, School of Business and IT.
    On Stage! Playwriting, Directing and Enacting the Informing Processes2007Doctoral thesis, monograph (Other academic)
  • 8.
    Abika, Angela
    et al.
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    Jönsson, Evakajsa
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    Hur gör jag för att orka?: Stöd till närstående som vårdar en demenssjuk i hemmet2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Det finns idag i Sverige många personer som har drabbats av en demenssjukdom. Att drabbas av demenssjukdom påverkar hela familjen och de närstående får ofta dra ett tungt lass vid vården av den sjuke. Många närstående sliter dygnet runt och löper därför stor risk att drabbas av hög stressbelastning och depression som följd. Demenssjukdom kan delas in i olika typer så som frontotemporal demens, Alzheimers sjukdom, vaskulärdemens. Olika typer av demens ger olika symtom men gemensamt är att de alla ger en kognitiv och känslomässig påverkan med bland annat nedsatt minnesfunktion, rastlöshet och oro. Syftet med studien var att undersöka vilka behov närstående som vårdar en demenssjuk i hemmet kan ha för att som sjuksköterska kunna stödja på bästa sätt. I denna studie har det använts elva artiklar varav sex är kvalitativa och tre kvantitativa samt två artiklar som var blandstudier med både kvalitativa och kvantitativa inslag. Analysen av materialet resulterade i två huvudkategorier vilka är kunskap om sjukdomen och kunskap om stöd som kan erbjudas, samt sex underkategorier.

    Resultatet visar att närstående har ett stort behov av utbildning och information, vilket de i dag inte tycker att de får tillräckligt av. De behöver dels kunskap om sjukdomen för att kunna förstå och ge en god vård, samt kunskap om sjukdomens utveckling för att kunna planera för framtiden. Det visar sig också att många närstående inte får tillräckligt information om hur de skall få kontakt med olika instanser, samt hur de kan söka olika stödåtgärder så som korttidsplats, dagverksamhet och avlösning i hemmet. För att närstående skall orka sköta den dagliga vården av den sjuke är det viktigt att han eller hon får tid att ta hand om sig själv. Som sjuksköterskor är det viktigt att ha en bra utbildning och en god förståelse för hur närstående och sjuka upplever sjukdomen, för att kunna ge en korrekt information samt att kunna stödja på bästa sätt.

  • 9. Aboh, I. J. Kwame
    et al.
    Henriksson, Dag
    University of Borås, School of Engineering.
    Laursen, Jens
    Lundin, Magnus
    University of Borås, School of Engineering.
    Gormon Ofosu, Francis
    Pind, Niels
    Selin Lindgren, Eva
    University of Borås, School of Engineering.
    Wahnström, Tomas
    University of Borås, School of Engineering.
    Identification of Aerosol Particle Sources in Semi-rural of Kwabenya, near Accra, Ghana2008Conference paper (Other academic)
  • 10. Aboh, I. J. Kwame
    et al.
    Henriksson, Dag
    University of Borås, School of Engineering.
    Laursen, Jens
    Selin Lindgren, Eva
    Lundin, Magnus
    University of Borås, School of Engineering.
    Pind, Niels
    Wahnström, Tomas
    University of Borås, School of Engineering.
    Air Pollution and Meteorology: Ambient PM2.5 Aerosol Origin Studied by Factor Analysis of Elemental Composition Related to Wind Data2008Conference paper (Other academic)
  • 11. Abrahamsson, A
    et al.
    Springett, J
    Karlsson, L
    Ottosson, T
    University of Borås, School of Education and Behavioural Science.
    Some Lessons from Swedish Midwives' Experiences of Approaching Women Smoker in Antenatal Care2005In: Midwifery, ISSN 0266-6138, E-ISSN 1532-3099, Vol. 21, no 4, 335-345 p.Article in journal (Refereed)
    Abstract [en]

    OBJECTIVE: to describe the qualitatively different ways in which midwives make sense of how to approach women smokers. DESIGN, SETTING AND PARTICIPANTS: a more person-centred national project 'Smoke-free pregnancy' has been in progress in Sweden since 1992. Using a phenomenographic approach, 24 midwives who have been regularly working in antenatal care were interviewed about addressing smoking during pregnancy. FINDINGS: four different story types of how the midwives made sense of their experiences in addressing smoking in pregnancy were identified: 'avoiding', 'informing', 'friend-making', 'co-operating'. KEY CONCLUSION: the midwives' story types about how they approached women who smoke illustrated the difficulties of changing from being an expert who gives information and advice to being an expert on how to enable a woman in finding out why she smoked and how to stop smoking. IMPLICATIONS FOR PRACTICE: health education about smoking that is built on co-operation and dialogue was seen by the midwives as a productive way of working. The starting point should be the lay perspective of a woman, which means that her thoughts about smoking cessation are given the space to grow while she talks.

  • 12. Abrahamsson, Agneta
    et al.
    Vibeke, Bing
    Löfström, Mikael
    University of Borås, School of Business and IT.
    Familjecentraler i Västra Götaland2009Report (Other academic)
  • 13.
    Abrahamsson, Anna-Karin
    et al.
    University of Borås, Swedish School of Library and Information Science.
    Rancken, Britt-Marie
    University of Borås, Swedish School of Library and Information Science.
    Att bli äldre: en annoterad bibliografi om åldrande och äldreomsorg 1977-19811982Independent thesis Advanced level (professional degree), 10 HE creditsStudent thesis
    Abstract [sv]

    Bibliografin innehåller litteratur som ur någon aspekt beskriver åldrande och samhällets äldreomsorg. Skönlitteratur och facklitteratur som utkommit på svenska under åren 1977-1981 är medtagna i förteckningen.

  • 14. Abrahamsson, Birgitta
    et al.
    Berg, Marie-Louise U.
    Jutengren, Göran
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    Jonsson, Annikki
    To recommend the local primary health-care centre or not: What importance do patients attach to initial contact quality, staff continuity and responsive staff encounters?2015In: International Journal for Quality in Health Care, ISSN 1353-4505, Vol. 27, no 3, 196-200 p.Article in journal (Other academic)
    Abstract [en]

    Objective: This study aims to examine the circumstances associated with patients’ tendencies to recommend a primary care centre, based on four hypotheses, the initial contact’s quality, care relationship continuity, treatment encounter responsiveness and whether the significance of encounter responsiveness differs depending on whether the patient has been seeing a nurse or physician. Design: The study is based on the patient’ self-reported responses, retrieved from the Swedish National Patient Survey. The design is cross-sectional, and data were analysed using a binary logistic regression. Setting: Data were collected from three primary healthcare centres in the region of Västra Götaland, Sweden. Participants: A total of 362 patients (62% females) having visited any of three publicly run healthcare centres in September 2010 constitute the analytical sample. Participants were fairly evenly distributed across all age groups. Main Outcome Measures: Recommendation was captured by patients’ binary responses to the question: Would you recommend the visited primary healthcare centre? Results: The hypotheses involving initial contact quality, care relationship continuity and treatment encounter responsiveness were supported by the analyses. The latter was strongly associated with patient tendency to recommend the primary healthcare centre. However, the profession (nurse or physician) involved in the treatment encounter made no difference for the predictive significance of encounter responsiveness for a patient’s tendency to recommend the healthcare centre. Conclusions: Striving for stable and responsive patient/staff relationships and an open approach towards patients are potentially successful strategies for primary healthcare centres seeking to attract new patients and maintain current ones. (PsycINFO Database Record (c) 2015 APA, all rights reserved)(journal abstract)

  • 15.
    Abrahamsson, Daniel
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Petersson, Oscar
    University of Borås, Faculty of Textiles, Engineering and Business.
    Anbud: Faktorer och förbättringsmöjligheter i anbudsprocessen2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The report shows how extensive the tender process is and what factors to consider in order tosubmit a winning bid. It highlights the different parts of the tender process and makes adeeper analysis of some of the most important factors. Bidding is not just about value whatsomething will cost. Because companies rarely are alone, they are finding ways and solutionsthat make the offer competitive. There is a high pace in the construction industry andconstruction companies currently have a lot to do.The report is written together with RO-Gruppen and a survey is the basis for the analysis. Thegoal was to describe RO-Gruppens work and to find possible improvement potential.As specifications, customers and procurement variations vary, it’s difficult to always followthe same template. Transparency and flexibility is required to analyze what exactly the clientis looking for. Experience proved to be a decisive factor, both according to the literature andthe questionnaire survey.

  • 16. Abtahi, F.
    et al.
    Gyllesten, I. C.
    Lindecrantz, Kaj
    University of Borås, School of Engineering.
    Seoane, Fernando
    University of Borås, School of Engineering.
    Software Tool for Analysis of Breathing Related Errors in Transthoracic Electrical Bioimpedance Spectroscopy Measurements2012Conference paper (Refereed)
  • 17. Abtahi, F
    et al.
    Seoane, F
    University of Borås, School of Engineering.
    Lindecrantz, K
    University of Borås, School of Engineering.
    Electrical bioimpedance spectroscopy in time-variant systems: Is undersampling always a problem?2014In: Journal of Electrical Bioimpedance, ISSN 1891-5469, E-ISSN 1891-5469, Vol. 5, no 1, 28-33 p.Article in journal (Refereed)
    Abstract [en]

    During the last decades, Electrical Bioimpedance Spectroscopy (EBIS) has been applied mainly by using the frequency-sweep technique, across a range of many different applications. Traditionally, the tissue under study is considered to be time-invariant and dynamic changes of tissue activity are ignored by treating the changes as a noise source. A new trend in EBIS is simultaneous electrical stimulation with several frequencies, through the application of a multi-sine, rectangular or other waveform. This method can provide measurements fast enough to sample dynamic changes of different tissues, such as cardiac muscle. This high sampling rate comes at a price of reduction in SNR and the increase in complexity of devices. Although the frequency-sweep technique is often inadequate for monitoring the dynamic changes in a variant system, it can be used successfully in applications focused on the time-invariant or slowly-variant part of a system. However, in order to successfully use frequency-sweep EBIS for monitoring time-variant systems, it is paramount to consider the effects of aliasing and especially the folding of higher frequencies, on the desired frequency e.g. DC level. This paper discusses sub-Nyquist sampling of thoracic EBIS measurements and its application in the case of monitoring pulmonary oedema. It is concluded that by considering aliasing, and with proper implementation of smoothing filters, as well as by using random sampling, frequency-sweep EBIS can be used for assessing time-invariant or slowly-variant properties of time-variant biological systems, even in the presence of aliasing. In general, undersampling is not always a problem, but does always require proper consideration.

  • 18. Abtahi, Farhad
    et al.
    Aslamy, Benjamin
    Boujabir, I
    Seoane, Fernando
    University of Borås, School of Health Science.
    Lindecrantz, Kaj
    University of Borås, School of Engineering.
    An Affordable ECG and Respiration Monitoring System Based on Raspberry PI and ADAS1000: First Step towards Homecare Applications2014In: 16th Nordic-Baltic Conference on Biomedical Engineering / [ed] Mindedal H., Persson M., Springer International Publishing , 2014, 5-8 p.Conference paper (Refereed)
    Abstract [en]

    Homecare is a potential solution for problems associated with an aging population. This may involve several physiological measurements, and hence a flexible but affordable measurement device is needed. In this work, we have designed an ADAS1000-based four-lead electrocardiogram (ECG) and respiration monitoring system. It has been implemented using Raspberry PI as a platform for homecare applications. ADuM chips based on iCoupler technology have been used to achieve electrical isolation as required by IEC 60601 and IEC 60950 for patient safety. The result proved the potential of Raspberry PI for the design of a compact, affordable, and medically safe measurement device. Further work involves developing a more flexible software for collecting measurements from different devices (measuring, e.g., blood pressure, weight, impedance spectroscopy, blood glucose) through Bluetooth or user input and integrating them into a cloud-based homecare system.

  • 19.
    Abtahi, Farhad
    et al.
    University of Borås, School of Health Science.
    Berndtsson, A
    University of Borås, School of Health Science.
    Abtahi, Shirin
    University of Borås, School of Health Science.
    Seoane, Fernando
    University of Borås, School of Health Science.
    Lindecrantz, Kaj
    KTH.
    Development and preliminary evaluation of an Android based heart rate variability biofeedback system2014Conference paper (Refereed)
    Abstract [en]

    The reduced Heart Rate Variability (HRV) is believed to be associated with several diseases such as congestive heart failure, diabetes and chronic kidney diseases (CKD). In these cases, HRV biofeedback may be a potential intervention method to increase HRV which in turn is beneficial to these patients. In this work, a real-time Android biofeedback application based on a Bluetooth enabled ECG and thoracic electrical bioimpedance (respiration) measurement device has been developed. The system performance and usability have been evaluated in a brief study with eight healthy volunteers. The result demonstrates real-time performance of system and positive effects of biofeedback training session by increased HRV and reduced heart rate. Further development of the application and training protocol is ongoing to investigate duration of training session to find an optimum length and interval of biofeedback sessions to use in potential interventions.

  • 20.
    Abtahi, Farhad
    et al.
    KTH-School of Technology and Health.
    Ji, Guangchao
    KTH-School of Technology and Health.
    Lu, Ke
    KTH-School of Technology and Health.
    Rödby, Kristian
    University of Borås, Faculty of Textiles, Engineering and Business.
    Björlin, Anders
    Kiwok AB.
    Östlund, Anders
    Kiwok AB.
    Seoane, Fernando
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    KTH-School of Technology and Health.
    Textile-Electronic Integration in Wearable Measurement Garments for Pervasive Healthcare Monitoring2015Conference paper (Other academic)
  • 21.
    Abtahi, Farhad
    et al.
    KTH-School of Technology and Health.
    Ji, Guangchao
    KTH-School of Technology and Health.
    Lu, Ke
    KTH-School of Technology and Health.
    Rödby, Kristian
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seoane, Fernando
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    A knitted garment using intarsia technique for Heart Rate Variability biofeedback: Evaluation of initial prototype2015Conference paper (Refereed)
  • 22.
    Abtahi, Farhad
    et al.
    KTH-School of Technology and Health.
    Lu, Ke
    KTH-School of Technology and Health.
    Dizon, M
    KTH-School of Technology and Health.
    Johansson, M
    KTH-School of Technology and Health.
    Seoane, Fernando
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Evaluating Atrial Fibrillation Detection Algorithm based on Heart Rate Variability analysis2015In: Medicinteknikdagarna, Uppsala: Svensk förening för medicinsk teknik och fysik , 2015Conference paper (Refereed)
  • 23.
    Abtahi, Farhad
    et al.
    KTH-School of Technology and Health.
    Lu, Ke
    KTH-School of Technology and Health.
    Dizon, M
    KTH-School of Technology and Health.
    Johansson, M
    KTH-School of Technology and Health.
    Seoane, Fernando
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Evaluation of Atrial Fibrillation Detection by using Heart Rate Variability analysis2015Conference paper (Other academic)
  • 24.
    Abtahi, Farhad
    et al.
    KTH-School of Technology and Health.
    Lu, Ke
    KTH-School of Technology and Health.
    Guangchao, Li
    KTH-School of Technology and Health.
    Rödby, Kristian
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seoane, Fernando
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    A Knitted Garment using Intarsia Technique for Heart Rate Variability Biofeedback: Evaluation of Initial Prototype.2015Conference paper (Other academic)
  • 25. Abtahi, Farhad
    et al.
    Snäll, Jonathan
    Aslamy, Benjamin
    Abtahi, Shirin
    Seoane, Fernando
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Biosignal PI, an Affordable Open-Source ECG and Respiration Measurement System2015In: Sensors, Vol. 15, no 1, 93-109 p.Article in journal (Refereed)
    Abstract [en]

    Bioimedical pilot projects e.g., telemedicine, homecare, animal and human trials usually involve several physiological measurements. Technical development of these projects is time consuming and in particular costly. A versatile but affordable biosignal measurement platform can help to reduce time and risk while keeping the focus on the important goal and making an efficient use of resources. In this work, an affordable and open source platform for development of physiological signals is proposed. As a first step an 8–12 leads electrocardiogram (ECG) and respiration monitoring system is developed. Chips based on iCoupler technology have been used to achieve electrical isolation as required by IEC 60601 for patient safety. The result shows the potential of this platform as a base for prototyping compact, affordable, and medically safe measurement systems. Further work involves both hardware and software development to develop modules. These modules may require development of front-ends for other biosignals or just collect data wirelessly from different devices e.g., blood pressure, weight, bioimpedance spectrum, blood glucose, e.g., through Bluetooth. All design and development documents, files and source codes will be available for non-commercial use through project website, BiosignalPI.org.

  • 26. Abtahi, Farhad
    et al.
    Snäll, Jonathan
    Aslamy, Benjamin
    Abtahi, Shirin
    Seoane, Fernando
    University of Borås, School of Health Science.
    Lindecrantz, Kaj
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    Biosignal PI, an Affordable Open-Source ECG and Respiration Measurement System2014In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 15, no 1, 93-109 p.Article in journal (Refereed)
    Abstract [en]

    Bioimedical pilot projects e.g., telemedicine, homecare, animal and human trials usually involve several physiological measurements. Technical development of these projects is time consuming and in particular costly. A versatile but affordable biosignal measurement platform can help to reduce time and risk while keeping the focus on the important goal and making an efficient use of resources. In this work, an affordable and open source platform for development of physiological signals is proposed. As a first step an 8–12 leads electrocardiogram (ECG) and respiration monitoring system is developed. Chips based on iCoupler technology have been used to achieve electrical isolation as required by IEC 60601 for patient safety. The result shows the potential of this platform as a base for prototyping compact, affordable, and medically safe measurement systems. Further work involves both hardware and software development to develop modules. These modules may require development of front-ends for other biosignals or just collect data wirelessly from different devices e.g., blood pressure, weight, bioimpedance spectrum, blood glucose, e.g., through Bluetooth. All design and development documents, files and source codes will be available for non-commercial use through project website, BiosignalPI.org.

  • 27. Abtahi, Zhohreh
    et al.
    Millati, Ria
    Niklasson, Claes
    Taherzadeh, Mohammad J.
    University of Borås, School of Engineering.
    Ethanol production by Mucor indicus at high glucose and ethanol concentrations2010In: Minerva biotecnologica (Testo stampato), ISSN 1120-4826, E-ISSN 1827-160X, Vol. 22, no 3-4, 83-89 p.Article in journal (Refereed)
    Abstract [en]

    Mucor indicus was cultivated under aerobic and anaerobic conditions to study its tolerance against high concentration of glucose up to 350 g/L and ethanol up to 120 g/L present in the medium. The fungus could grow well even in 350 g/L glucose and produce ethanol, but it was able to assimilate the entire glucose when its concentration was less than 200 g/L. On the other hand, M. indicus produced ethanol as the main product with yield and concentration up to 0.45 g/g and 73 g/L, respectively, while glycerol, its only major byproduct, was produced up to 24 g/L. However, the fungus was not so tolerant against exogenously added ethanol, and it could not grow with more than 40 g/L added ethanol to the culture. Under aerobic conditions, M. indicus displayed different morphology, switching from long filamentous to yeast-like growth forms by increasing initial glucose concentration. This implies that yeast-like growth can be induced by growing M. indicus at high glucose concentration. Under anaerobic conditions, only one yeast-like form was observed.

  • 28. Abylaev, Mansur
    et al.
    Pal, Rudrajeet
    University of Borås, Swedish School of Textiles.
    Torstensson, Håkan
    University of Borås, Swedish School of Textiles.
    Resilience challenges for textile enterprises in a transitional economy and regional trade perspective: a study of Kyrgyz conditions2014In: International Journal of Supply Chain and Operations Resilience, ISSN 2052-868X, Vol. 1, no 1, 54-75 p.Article in journal (Refereed)
    Abstract [en]

    This paper aims to contribute to the resilience development of the textile sector in a transitional economy, based on a case study of the Kyrgyz Republic, where the transition to a free market system generated broken supply chains, low diversification, a high open economy level of the textile sector and dependence on international trade regulations. The approach used is based on theories of organisational resilience, literature studies and fieldwork. Scenarios are developed and analysed by event tree and SWOT analysis, to identify resilience properties of the textile sector. Findings focus on the implications of future membership or non-membership, respectively, in the Customs Union of Belarus, Kazakhstan and Russia, where both supportive and adverse effects have been identified. The results contribute to the knowledge of the transitional economy conditions and serve as a guideline for stakeholders about enhancing resilience, both at the industrial and organisational levels, of the Kyrgyz textile sector.

  • 29. Abylaev, Mansur
    et al.
    Torstensson, Håkan
    University of Borås, Swedish School of Textiles.
    Supply chain resilience of Kyrgyz textile companies in regional international trade integration2013In: / [ed] Pawar, KS & Rogers, H, Nottingham University Business School , 2013Conference paper (Refereed)
    Abstract [en]

    The transitional period of the Kyrgyz economy from planned to free market economy modified the structure of the textile sector. The state owned big textile producers were fragmented into small sized private apparel manufacturers. The main success factor of transformation was the international trade regulation and international textile market conjuncture. Latest regionalization processes of Kyrgyz apparel exporting countries modify the existing competitive advantage of Kyrgyz apparel cluster and obligate to redesign the supply chain in order to withstand the disruption. The main purpose of the paper is to analyze the success factors of resilient supply chain during transitional period and the possibility of transferring from the global to a regional supply chain as the main resilience factor of Kyrgyz apparel companies.

  • 30.
    Ackerfors, Martin
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    On blogs in the catalogue: A study of public librarians attitude towards including blogs in the library catalogue2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Den här studien undersöker förhållandena för att inkludera bloggar i svenska folkbibliotekens kataloger. Varför förvärvas bloggar som blivit böcker, men inte bloggarna själva?

    Studien söker förståelse för och diskuterar de hinder och möjligheter som påverkar en inkludering av bloggar i katalogerna.

    Den teoretiska basen består av ett postmodernt perspektiv på biblioteken, och en jämförelse mellan olika sätt att se på folkbibliotekens uppdrag.

    Studien använder en blandad metod och kombinerar djupare intervjuer för att få insikt i folkbiblioteken, med en enkätstudie riktad till svenska folkbibliotekarier. Frågorna handlade om attityder gentemot bibliotekens uppdrag, bloggen som medieformat, och hur en inkludering av bloggar i bibliotekskatalogen skulle påverka biblioteket idag och i framtiden.

    Studien fann att bloggens materialitet medför hinder som behöver överbryggas för att en inkludering ska vara möjlig, och uppdragen folkbibliotekarierna håller viktiga gynnar en inkludering av bloggar.

  • 31.
    Ackre, Josefin
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Stefenburg, Frida
    University of Borås, Faculty of Textiles, Engineering and Business.
    Sociala medier: ett verktyg för en mer hållbar klädkonsumtion2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning Dagens klädkonsumtion sammankopplas ofta med hållbarhet framförallt gällande materialets miljöpåverkan och arbetsförhållanden i produktionen. Kläder massproduceras och tillverkas därför inte med hållbarhet i fokus. Företag kommer undan med att erbjuda icke hållbara kläder eftersom konsumenter främst fokuserar på utseende och pris istället för hållbarhet i sitt konsumentbeteende. Tidigare forskning beskriver att konsumenter har en negativ attityd till klädindustrins påverkan på hållbarhet men att de inte konsumerar hållbart på grund av kunskapsbrist. Denna brist på kunskap skapar ett gap mellan konsumenters attityd till hållbar klädkonsumtion och deras konsumentbeteende. Problemet med ökad konsumtion och hållbarhet kan kopplas till sociala medier. Sociala medier används bland annat för att hitta lättillgänglig och okomplicerad information om kläder. Tidigare forskning menar att sociala medier påverkar konsumentbeteendet genom att skapa ett behov för produkter man tidigare inte tänkt köpa. Vidare visar forskning att konsumenter påverkas mer av produktinformation från en tredje part så som vänner, familj eller referensgrupper. Vår undersökning grundar sig därför i sociala mediers stora inflytande på konsumenter och gapet mellan konsumenters attityd till och beteende vid hållbar klädkonsumtion. Uppsatsens syfte är därför att undersöka om sociala medier kan öka intresset för hållbara kläder hos yngre konsumenter. Vi fokuserar på yngre konsumenter eftersom de är uppväxta med datorer och internet samt är den grupp som flitigast använder sociala medier. I studien användes en kvalitativ metod där empiri samlades in genom fokusgrupper. Avsikten var att få en djupare förståelse för deltagarnas åsikter och idéer kring våra teman: hållbara kläder, konsumentbeteende, konsumentattityder och sociala medier. Tidigare forskning stämde överens med resultatet i vår studie där deltagarna beskrev att de inte hade möjlighet att konsumera hållbart eftersom de inte hade kunskapen om vad hållbara kläder faktiskt är. Där även textilstudenter som hade mer kunskap ansåg att det krävdes mer information för att de skulle kunna agera mer hållbart. Vidare visade även vår studie att sociala medier har en stor påverkan på ett konsumentbeteende. Genom att applicera vår empiri på ABC model of Attitudes kunde vi även se att sociala medier influerar konsumenters uppfattning, känsla och beteende vilket påverkar deras konsumentattityd. Alla deltagare i vår undersökning önskade mer lättillgänglig information om hållbara kläder i sociala medier eftersom det är en kanal de alla påverkas av. Ytterligare argumenterade de för att det krävs att fler personer tar sitt ansvar och delar kunskap om hållbara kläder för att skapa ett ökat intresse och tillslut ett förändrat beteende. Slutsatsen kunde därför dras att sociala medier kan vara ett verktyg för att öka intresset för hållbara kläder hos yngre konsumenter. Genom vår studie vill vi bidra till en djupare förståelse av konsumentbeteende samt konsumenternas attityder till hållbara kläder och sociala medier.

  • 32. Acín, Antonio
    et al.
    Pironio, Stefano
    Vértesi, Tamás
    Wittek, Peter
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Optimal randomness certification from one entangled bit2016In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 93, no 4Article in journal (Refereed)
    Abstract [en]

    By performing local projective measurements on a two-qubit entangled state one can certify in a device-independent way up to one bit of randomness. We show here that general measurements, defined by positive-operator-valued measures, can certify up to two bits of randomness, which is the optimal amount of randomness that can be certified from an entangled bit. General measurements thus provide an advantage over projective ones for device-independent randomness certification.

  • 33.
    Adekunle, K.
    et al.
    University of Borås, School of Engineering.
    Cho, S.-W.
    University of Borås, School of Engineering.
    Ketzscher, R.
    Skrifvars, M.
    University of Borås, School of Engineering.
    Mechanical properties of natural fiber hybrid composites based on renewable thermoset resins derived from soybean oil, for use in technical applications2012In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 124, no 6, 4530-4541 p.Article in journal (Refereed)
    Abstract [en]

    Natural fiber composites are known to have lower mechanical properties than glass or carbon fiber reinforced composites. The hybrid natural fiber composites prepared in this study have relatively good mechanical properties. Different combinations of woven and non-woven flax fibers were used. The stacking sequence of the fibers was in different orientations, such as 0°, +45°, and 90°. The composites manufactured had good mechanical properties. A tensile strength of about 119 MPa and Young's modulus of about 14 GPa was achieved, with flexural strength and modulus of about 201 MPa and 24 GPa, respectively. For the purposes of comparison, composites were made with a combination of woven fabrics and glass fibers. One ply of a glass fiber mat was sandwiched in the mid-plane and this increased the tensile strength considerably to 168 MPa. Dynamic mechanical analysis was performed in order to determine the storage and loss modulus and the glass transition temperature of the composites. Microstructural analysis was done with scanning electron microscopy.

  • 34.
    Adekunle, K.
    et al.
    University of Borås, School of Engineering.
    Cho, S.-W.
    University of Borås, School of Engineering.
    Patzelt, C.
    Blomfeldt, T.
    Skrifvars, M.
    University of Borås, School of Engineering.
    Impact and flexural properties of flax fabrics and Lyocell Fiber reinforced bio-based thermoset for automotive and structural applications2012Conference paper (Refereed)
  • 35.
    Adekunle, K.
    et al.
    University of Borås, School of Engineering.
    Ghoreishi, R.
    Ehsani, M.
    Cho, S.-W.
    University of Borås, School of Engineering.
    Skrifvars, M.
    University of Borås, School of Engineering.
    Jute fiber reinforced methacrylated soy bean oil based thermoset composites prepared by vacuum injection molding technique2012In: Journal of Biobased Materials and Bioenergy, ISSN 1556-6560, E-ISSN 1556-6579, Vol. 6, no 2, 172-177 p.Article in journal (Refereed)
    Abstract [en]

    Bio-based composites based on soybean oil thermoset resin were manufactured with vacuum injection molding technique. Methacrylated soybean oil (MMSO) was processed with vacuum injection molding technique without blending with styrene. The composites produced had comparatively good mechanical properties like jute composite reinforced acrylated epoxidised soybean oil (AESO) resin blended with styrene. Although the tensile strength of the jute reinforced AESO composites are slightly higher than the jute reinforced MMSO composites which was attributed to blending of AESO with styrene. However, the difference in Youngs' modulus was negligible because they have approximately equal stiffness between 2.6 GPa and 2.8 GPa. The jute reinforced AESO composites showed relatively higher flexural strengths and moduli than the MMSO counterparts. This difference was also attributed to the blending of AESO with reactive diluent such as styrene. In order to determine the dimensional stability of the composite manufactured, water absorption test was carried out and the conclusion was that the moisture uptake of the jute reinforced composites was the same, this was expected.

  • 36.
    Adekunle, Kayode
    University of Borås, School of Engineering.
    Bio-based Composites from Soybean Oil Thermosets and Natural Fibers2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In order to reduce over-dependency on fossil fuels and to create an environment that is free of non-degradable plastics, and most importantly to reduce greenhouse gas emission, bio-based products are being developed from renewable resources through intense research to substitute conventional petrochemical-based plastics with renewable alternatives and to replace synthetic fibers with natural fibers. Many authors have done quite a lot of work on synthesizing polymers from renewable origin. Polylactic acid (PLA) has been developed and characterized, and it was found that it has enormous potential and can serve as an alternative to conventional thermoplastics in many applications. Modification of the plant oil triglycerides has been discussed by many authors, and research is still going on in this area. The challenge is how to make these renewable polymers more competitive in the market, and if possible to make them 100% bio-based. There is also a major disadvantage to using a bio-based polymer from plant oils because of the high viscosity, which makes impregnation of fibers difficult. Although natural fibers are hydrophilic in nature, the problem of compatibility with the hydrophobic matrix must be solved; however, the viscosity of the bio-based resin from plant oils will complicate the situation even more. This is why many authors have reported blending of the renewable thermoset resin with styrene. In the process of solving one problem, i.e reducing the viscosity of the renewable thermoset resin by blending with reactive diluents such as styrene, another problem which we intended to solve at the initial stage is invariably being created by using a volatile organic solvent like styrene. The solution to this cycle of problems is to synthesize a thermoset resin from plant oils which will have lower viscosity, and at the same time have higher levels of functionality. This will increase the crosslinking density, and they can be cured at room temperature or relatively low temperature. In view of the above considerations, the work included in this thesis has provided a reasonable solution to the compounded problems highlighted above. Three types of bio-based thermoset resins were synthesized and characterized using NMR, DSC, TGA, and FT-IR, and their processability was studied. The three resins were subsequently reinforced with natural fibers (woven and non-woven), glass fibers, and Lyocell fiber and the resulting natural fiber composites were characterized by mechanical, dynamic mechanical, impact, and SEM analyses. These composites can be used extensively in the automotive industry, particularly for the interior components, and also in the construction and furniture industries. Methacrylated soybean oil (MSO), methacrylic anhydride-modified soybean oil (MMSO), and acetic anhydride-modified soybean oil (AMSO) were found to be suitable for manufacture of composites because of their lower viscosity. The MMSO and MSO resins were found to be promising materials because composites manufactured by using them as a matrix showed very good mechanical properties. The MMSO resin can completely wet a fiber without the addition of styrene. It has the highest number of methacrylates per triglyceride and high crosslink density.

  • 37.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Cho, Sung-Woo
    University of Borås, School of Engineering.
    Patzelt, Christian
    Blomfeldt, Thomas
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Impact and flexural properties of flax fabrics and Lyocell fiber-reinforced bio-based thermoset2011In: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 30, no 8, 685-697 p.Article in journal (Refereed)
    Abstract [en]

    A bio-based thermoset resin was reinforced with flax fabrics and Lyocell fiber. The effect of different weave architectures was studied with four flax fabrics with different architectures: plain, twill (two different types), and dobby. The effect of the outer ply thickness was studied and characterized with flexural and impact testing. Composites manufactured with plain weave reinforcement had the best mechanical properties. The tensile strength, tensile modulus, flexural strength, flexural modulus, and impact strength were 280 MPa, 32 GPa, 250 MPa, 25 GPa, and 75 kJ/m2, respectively. Reinforcements with twill-weave architecture did not impart appreciable flexural strength or flexural modulus even when the outer thickness was increased. Plain- and dobby (basket woven style)-weave architectures gave better reinforcing effects and the flexural properties increased with an increase in outer thickness.Water absorption properties of the composites were studied and it was observed that the hybridization with Lyocell fiber reduced the water uptake. Fieldemission scanning electron microscopy was used to study the micro-structural properties of the composites.

  • 38.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Ketzscher, Richard
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    High performance natural fibre hybrid composites based on biobased thermoset resins for use in technical applications2009Conference paper (Other academic)
    Abstract [en]

    Health related issues, stringent environmental protection policies, search for cost effective and alternative materials and quest for renewability, sustainability and high performance materials for technical applications has led to an intense research in manufacturing biobased composites which are based on renewable thermosetting resins and natural fibres. The combination of biobased thermosetting resins with two different natural fibre reinforcements could lead to improved mechanical properties of the composite. Biobased thermoset polymers are comparable to the synthetic thermosetting polymers from petrochemicals. In this study, two different biobased resins were used as matrix and both non woven flax fibre and woven flax fabric were combined as reinforcements. The composites were made by compression moulding process. The fibres were hand laid-up and impregnation was done manually. The curing temperature was 170°С and at 40 bar. The stacking sequence of the fibres was in different orientations such as 0º, +45º and 90º. The manufactured hybrid composites have high tensile strength and stiffness and the flexural strength and modulus was also high. These composites can compete favourably with glass fibre reinforced composites in terms of strength and stiffness.1, 2 A tensile strength of about 119 MPa and Young’s modulus of 13.8 GPa was achieved, while the flexural strength and modulus is about 201 MPa and 24 GPa respectively. For the purpose of comparison, composites were made with the combination of woven fabric and e-glass fibre. One ply of an e-glass fibre mat was put in the mid-plane and this increased the tensile strength considerably up to 168 MPa. Some of the composites were made with the resin blended with styrene and the results show a higher modulus.

  • 39.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Patzelt, Christian
    Kalantar, Adib
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Mechanical and Viscoelastic Properties of Soybean Oil Thermoset Reinforced with Jute Fabrics and Carded Lyocell Fiber2011In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 122, no 5, 2855-2863 p.Article in journal (Refereed)
    Abstract [en]

    Composites and hybrid composites were manufactured from renewable materials based on jute fibers, regenerated cellulose fibers (Lyocell), and thermosetting polymer from soybean oil. Three different types of jute fabrics with biaxial weave architecture but different surface weights, and carded Lyocell fiber were used as reinforcements. Hybrid composites were also manufactured by combining the jute reinforcements with the Lyocell. The Lyocell composite was found to have better mechanical properties than other composites. It has tensile strength and modulus of about 144 MPa and 18 GPa, respectively. The jute composites also have relatively good mechanical properties, as their tensile strengths and moduli were found to be between 65 and 84 MPa, and between 14 and 19 GPa, respectively. The Lyocell-reinforced composite showed the highest flexural strength and modulus, of about 217 MPa and 13 GPa, respectively. In all cases, the hybrid composites in this study showed improved mechanical properties but lower storage modulus. The Lyocell fiber gave the highest impact strength of about 35 kJ/m2, which could be a result of its morphology. Dynamic mechanical analysis showed that the Lyocell reinforced composite has the best viscoelastic properties.

  • 40.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Patzelt, Christian
    Kalantar, Adib
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Mechanical properties of renewable soyean oil thermoset reinforced with jute fabricsand lyocell fiber2011Conference paper (Refereed)
  • 41.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Synthesis of reactive soybean oils for use as thermoset resins in composites.2007Conference paper (Refereed)
  • 42.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Bakare, Fatimat
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Bio-based thermoset resins from soybean and linseed oils for structural composites2011Conference paper (Refereed)
  • 43.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Biobased Composites Prepared by Compression Molding with a Novel Thermoset Resin from Soybean Oil and a Natural-Fiber Reinforcement2010In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 116, no 3, 1759-1765 p.Article in journal (Refereed)
    Abstract [en]

    Biobased composites were manufactured with a compression-molding technique. Novel thermoset resins from soybean oil were used as a matrix, and flax fibers were used as reinforcements. The air-laid fibers were stacked randomly, the woven fabrics were stacked crosswise (0/90 ), and impregnation was performed manually. The fiber/resin ratio was 60 : 40. The prepared biobased composites were characterized by impact and flexural testing. Scanning electron microscopy of knife-cut cross sections of the specimens was also done to investigate the fiber–matrix interface. Thermogravimetric analysis of the composites was carried out to provide indications of thermal stability. Three resins from soybean oil [methacrylated soybean oil, methacrylic anhydride modified soybean oil (MMSO), and acetic anhydride modified soybean oil] were used as matrices. The impact strength of the composites with MMSO resin reinforced with air-laid flax fibers was 24 kJ/m2, whereas that of the MMSO resin reinforced with woven flax fabric was between 24 and 29 kJ/m2. The flexural strength of the MMSO resin reinforced with air-laid flax fibers was between 83 and 118 MPa, and the flexural modulus was between 4 and 6 GPa, whereas the flexural strength of the MMSO resin reinforced with woven fabric was between 90 and 110 MPa, and the flexural modulus was between 4.87 and 6.1 GPa.

  • 44.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Biobased Composites Prepared by Compression Moulding using a Novel Thermoset Resin from Soybean oil and a Natural Fibre Reinforcement2009Conference paper (Other academic)
    Abstract [en]

    Biobased composites were manufactured by using a compression moulding technique. Novel thermoset resins from soybean oil were used as matrix while flax fibres were used as reinforcement. The airlaid fibres were stacked randomly while woven fabrics were stacked crosswisely (90°) and impregnation was done manually. The fibre/ resin ratio was 60% to 40%.

  • 45.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Preparation of biobased composites using novel thermoset polymers from soybean oil and a natural fibre reinforcement2009Conference paper (Other academic)
    Abstract [en]

    Health related issues, stringent environmental protection policies, search for cost effective and alternative materials, crave for renewability and sustainability and quest for high performance materials for structural applications give the motivation for research in polymer composites and material science. Due to the health, safety and environmental concerns over the conventional synthetic materials and the legislation against their usage both in domestic and industrial applications, alternatives sources that will be comparable in properties are being sought. There is an emerging market for biodegradable polymers which is expected to increase substantially in the coming years.[1] Preparation of Composites Airlaid and woven flax fibre mats were first treated with 4% sodium hydroxide solution for one hour and then washed with plenty of water. This was done in order to remove any residual impurities. The fibres were dried at room temperature for 24 hr and then dried in a vacuum oven for 1hr at a temperature of 105°С. The 8 sheets of the fibre were hand laid cross- wisely and the impregnation was done manually. The fibre/ resin ratio was about 60% to 40%. Methacrylated soybean oil, methacrylic anhydride and acetic anhydride modified soybean oil were the synthesized matrices used. The compression moulding was done at a temperature of 170°С for 5 min at 40bar. Characterisations The tensile testing was performed based on an ISO-test method for tensile tests on plastic materials. The Charpy impact strength of unnotched specimens was evaluated in accordance with ISO 179 using a Zwick test instrument and scanning electron microscopy analysis was done on the fractured specimens. The composites showed various mechanical properties, having impact strengths between 24 and 63 kJ/m² and tensile strength up to 51MPa.

  • 46.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Synthesis of reactive soybean oils for use as a biobased thermoset resins in structural natural fiber composites2009In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 115, no 6, 3137-3145 p.Article in journal (Refereed)
    Abstract [en]

    Biobased thermosets resins were synthesized by functionalizing the triglycerides of epoxidized soybean oil with methacrylic acid, acetyl anhydride, and methacrylic anhydride. The obtained resins were characterized with FTIR, 1H-NMR, and 13C-NMR spectroscopy to confirm the functionalization reactions and the extent of epoxy conversion. The viscosities of the methacrylated soybean oil resins were also measured for the purpose of being used as a matrix in composite applications. The cross-linking capability was estimated by UV and thermally initiated curing experiments, and by DSC analysis regarding the degree of crosslinking. The modifications were successful because up to 97% conversion of epoxy group were achieved leaving only 2.2% of unreacted epoxy groups, which was confirmed by 1H-NMR. The 13C-NMR confirms the ratio of acetate to methacrylate methyl group to be 1 : 1. The viscosities of the methacrylated soybean oil (MSO) and methacrylic anhydride modified soybean oil (MMSO) were 0.2 and 0.48 Pas, respectively, which indicates that they can be used in resin transfer molding process.

  • 47.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Synthesis of reactive soybean oils for use as biobased thermoset resins in structural natural fibre composites2008Conference paper (Refereed)
  • 48.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Synthetic modification of reactive soybean oils for use as biobased thermoset resins in structural natural fiber composites2008In: Polymer Preprints, ISSN 0551-4657, Vol. 49, no 1, 279- p.Article in journal (Refereed)
  • 49.
    Adekunle, Kayode
    et al.
    University of Borås, School of Engineering.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Synthetic modification of reactive soybean oils for use as biobased thermoset resins in structural natural fiber composites2008Conference paper (Other academic)
  • 50.
    Adessa, C.
    et al.
    University of Borås, Swedish School of Library and Information Science.
    Sonnenwald, Diane H.
    University of Borås, Swedish School of Library and Information Science.
    Exploring collaboration among historically black universities and doctoral/research universities in the USA2003Conference paper (Refereed)
    Abstract [en]

    In the USA, historically black colleges and universities (HBCUs) seldom have sufficient resources and infrastructure to support faculty and student research or doctoral education. In contrast, doctoral/research universities (DRUs) have extensive resources and infrastructure to support research and doctoral education. istoricHBoth HBCUs and DRUs have talented faculty and students, and collaboration between faculty and students and HBCUs and DRUs has the potential of increasing the physical and intellectual resources brought to bear in research and student education. However, not all collaborations are successful. We studied four instances of collaboration among HBCUs and DRUs to investigate points of tension, identify successful practices, and gather suggestions for improving existing and future collaborations between institutions with different cultural heritages and organizational priorities.

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