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  • 1.
    Abbasi, Ziwar
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Bernebrand, Anna
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Projektering av elnätet för ett exploateringsområde2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Det växande invånarantalet i Sverige har under det senaste decenniet lett till ett stort behov av nybyggnationer av bostäder. Till följd av detta har nybyggnationer av bostäder ökat kraftigt. För att bemöta kapacitetsbehovet krävs stora investeringar från elnätsbolagen för att kunna ansluta de nytillkomna bostadsområdena samt för att möjliggöra utbyggnad av ny infrastruktur. Expansionsmöjligheterna som har uppstått i den aktuella kommunen har lett till utbyggnad av elnätet för ett nytt bostadsområde. Syftet med projekteringen är att hitta en rationell lösning för att kunna förse ett exploateringsområde bestående av 19 bostäder med elektricitet. För att uppnå ett önskvärt resultat med projekteringen har företagsriktlinjer och branschstandarder använts. Det projekterade distributionsnätet utformas av radiellt system, vilket innebär att matning enbart sker från ett håll. Distributionsnätet är uppbyggt av två olika fördelningssystem: TN-S och TN-C. Projekteringen omfattar även nätberäkningar som utförts med både optimeringsprogrammet NetBas och även manuellt. De parametrar som har beräknats är spänningsfall, kortslutningsströmmar och utlösningstider. Dimensioneringen av distributionsnätet, som utfördes endast med hjälp av NetBas, resulterade i placering av en nätstation, fem stycken kabelskåp, 0,9 kilometer lågspänningskabel och 0,13 kilometer högspänningskabel. Projektets totala investeringskostnad har approximativt beräknats till 568 000 kronor.

  • 2. Abbaszadeh, A
    et al.
    Taherzadeh, Mohammad J.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Effect of extraction conditions on yield and purity of citrus pectin by sulfuric and hydrochloric acids2009Konferansepaper (Fagfellevurdert)
  • 3.
    Abd Al Sater, Wissam
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Effektiv logistik med lossningskalender på byggarbetsplatsen2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    För att arbetsledaren skall utveckla en logistikorganisation som fungerar mer än väl bygger detta alltid på att de interna logistikrutinerna är välfungerande. Rutinerna skall fungera om riktlinjer och stöd för arbetsledaren i alla typer av projekt. Studien syftar att studera NCC-projekt som använder och/eller inte använder det nya verktyget, lossningskalender, för att identifiera dess positiva resultat Studien använder en kvalitativ metod där författaren genomför intervjuer med 4 respondenter inom NCC. Resultatdelen består av tre kategorier efter bearbetning av insamlade data, dessa är: Effektivisering, Dokumentering och Stöd för arbetsledning. Elektroniska logistikverktyg som lossningskalendern är av stor betydelse för arbetsledaren och kan vara avgörande i kvalitén i samtliga byggprojekt.

  • 4.
    Abdusemed, Wefae
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Shahin, Antonella
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Gustafsson, Maria
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Anställningsbarhet: hur har nyexaminerade studenter formats inför framtida arbetsliv2018Independent thesis Basic level (degree of Bachelor of Fine Arts), 10 poäng / 15 hpOppgave
    Abstract [en]

    Employability among newly graduated students, a concept that is being discussed more as of late, as well as it is growing. The interesting aspect of the concept is how you, as an individual, can contribute in order to better your employability skill or competence. Additional interesting aspects subsists of which factors within employability that are interesting among the employers and what the government, different organizations or education can do to contribute for a greater employability skill set. However, this thesis mainly focuses on what it actually means to be employable. This study is based on an analysis between two groups, one study group and one control group. The study concludes whether newly graduated students from two different groups feel that it is somewhat difficult to enter the labor market, where the study group have had some kind of connection with different business companies, through experience or shorter internships. How well do the individuals within these two different groups know their own employability? The aim of the study is to analyze whether there is a difference between the newly graduated students, within the two different groups, regarding their employability. Moreover, whether the students from the study group with internship experiences within their degree, have better employability competence or not. In order to reach out to a larger group, which we decided to define to no later graduation than five years prior to this study, we decided to use a quantitative method. A questionnaire survey was conducted where the survey was based on fixed options with possibility for voluntary supplementary comments. Furthermore, the choice of a questionnaire fell naturally because of the time limit as well as the need of a large amount of answers to reach the purpose of the study. A total of 183 answers were obtained where 1213 questionnaire were sent out, giving a response rate of 15, 09 percent and a loss of 84, 9 percent in the study. Based on the respondents results on their estimation of their different characteristics, which were in connection with the different employability factors, has the following concluding results been drawn: When it comes to the respondents’ estimation of themselves in the survey, the three most common options, which they consider to have acquired their characteristics from, are: education, family / upbringing and previous employment. The research group and the control group showed similar values and results, with no major differences. However, some interesting relations were found.

  • 5.
    Abed, Samah
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Al-Kaisee, Farah
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Metallutvinning med fokus på zinkfrån avfallsflygaska med hjälp avsura processvatten2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Syftet med projektet är att behandla flygaskan med hjälp av surt processvatten för att utvinna olika metaller, som zink, så att det sedan kan deponeras på ett enklare och billigare sätt, samt även at utveckla en metod för att utvinna mer zink med minsta möjliga andel surt processvatten (5 % HCl). Olika metaller med fokus på zink studerades i labbskala på Högskolan i Borås. Flygaskan och det sura processvattnet som har använts i denna studie är från Renova ABs anläggning. Resultatet visar att vid behandling av flygaskan med surt processvatten var den maximala mängden zink som utvanns 88% under de olika försöken som gjordes i labbet. Det finns olika faktorer bakom resultatet, såsom halten av surt processvatten, pH, blandningstiden och askans elementsammansättning, vilka kan påverka halten utvunnen zink.

  • 6.
    Abedinifar, S.
    et al.
    Department of Chemical Engineering, Isfahan University of Technology.
    Karimi, K
    Department of Chemical Engineering, Isfahan University of Technology.
    Khanahmadi, M.
    Isfahan Agriculture and Natural Resources Research Centre.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Ethanol production by Mucor indicus and Rhizopus oryzae from rice straw by separate hydrolysis and fermentation2009Inngår i: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 33, nr 5, s. 828-833Artikkel i tidsskrift (Fagfellevurdert)
    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 β-glucosidase enzymes were first investigated and their best performance obtained at 45 °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. 

  • 7. Abedinifar, Sorahi
    et al.
    Karimi, Keikhosro
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Khanahmadi, Morteza
    Taherzadeh, Mohammad J.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Ethanol production by Mucor indicus and Rhizapus oryzae from rice straw by separate hydrolysis and fermentation2009Inngår i: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 33, nr 5, s. 828-833Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 8.
    Abrahamsson, Daniel
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Petersson, Oscar
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Anbud: Faktorer och förbättringsmöjligheter i anbudsprocessen2017Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Rapporten visar hur omfattande anbudsprocessen är och vilka faktorer man bör beakta för attlämna ett vinnande anbud. Den beskriver de olika delarna i anbudsprocessen och gör endjupare analys av några av de viktigaste faktorerna. Anbudslämning handlar inte bara om attlämna pris på vad något kommer att kosta. Eftersom bolagen sällan är ensamma gäller de atthitta vägar och lösningar som gör att anbudet blir konkurrenskraftigt. Alternativa tekniskalösningar, materialval, val av UE eller en snygg presentation är faktorer som kan göra anbudetvinnande.Rapporten är skriven tillsammans med RO-Gruppen och en enkät ligger som grund tillanalysen. Målsättningen var att beskriva RO-Gruppens arbete och finna eventuell möjlighettill förbättring och effektivisering i arbetet.Då FFU, beställare och upphandlingsform varierar är det svårt att alltid följa en och sammamall utan en öppenhet och flexibilitet i arbetet krävs för att kunna lämna ett vinnande anbud.Erfarenhet visade sig vara en stor och avgörande faktor, såväl enligt litteratur, somenkätundersökningen.

  • 9. Abtahi, F.
    et al.
    Gyllesten, I. C.
    Lindecrantz, Kaj
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Seoane, Fernando
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Software Tool for Analysis of Breathing Related Errors in Transthoracic Electrical Bioimpedance Spectroscopy Measurements2012Konferansepaper (Fagfellevurdert)
  • 10. Abtahi, F
    et al.
    Seoane, F
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Lindecrantz, K
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Electrical bioimpedance spectroscopy in time-variant systems: Is undersampling always a problem?2014Inngår i: Journal of Electrical Bioimpedance, ISSN 1891-5469, E-ISSN 1891-5469, Vol. 5, nr 1, s. 28-33Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 11.
    Abtahi, Farhad
    et al.
    Karolinska Institutet.
    Anund, Anna
    Fors, Carina
    Seoane, Fernando
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. Karolinska Institutet.
    Lindecrantz, Kaj
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Karolinska Institutet.
    Association of Drivers’ sleepiness with heart rate variability. A Pilot Study with Drivers on Real Road2017Konferansepaper (Annet vitenskapelig)
  • 12. Abtahi, Farhad
    et al.
    Aslamy, Benjamin
    Boujabir, I
    Seoane, Fernando
    Högskolan i Borås, Institutionen för Vårdvetenskap.
    Lindecrantz, Kaj
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    An Affordable ECG and Respiration Monitoring System Based on Raspberry PI and ADAS1000: First Step towards Homecare Applications2014Inngår i: 16th Nordic-Baltic Conference on Biomedical Engineering / [ed] Mindedal H., Persson M., Springer International Publishing , 2014, s. 5-8Konferansepaper (Fagfellevurdert)
    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.

  • 13.
    Abtahi, Farhad
    et al.
    Högskolan i Borås, Institutionen för Vårdvetenskap.
    Berndtsson, A
    Högskolan i Borås, Institutionen för Vårdvetenskap.
    Abtahi, Shirin
    Högskolan i Borås, Institutionen för Vårdvetenskap.
    Seoane, Fernando
    Högskolan i Borås, Institutionen för Vårdvetenskap.
    Lindecrantz, Kaj
    KTH.
    Development and preliminary evaluation of an Android based heart rate variability biofeedback system2014Konferansepaper (Fagfellevurdert)
    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.

  • 14.
    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
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Björlin, Anders
    Kiwok AB.
    Östlund, Anders
    Kiwok AB.
    Seoane, Fernando
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    KTH-School of Technology and Health.
    Textile-Electronic Integration in Wearable Measurement Garments for Pervasive Healthcare Monitoring2015Konferansepaper (Annet vitenskapelig)
  • 15.
    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
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Seoane, Fernando
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    A knitted garment using intarsia technique for Heart Rate Variability biofeedback: Evaluation of initial prototype2015Inngår i: Proceedings of the 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2015, s. 3121-3124Konferansepaper (Fagfellevurdert)
  • 16.
    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
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    Evaluating Atrial Fibrillation Detection Algorithm based on Heart Rate Variability analysis2015Inngår i: Medicinteknikdagarna, Uppsala: Svensk förening för medicinsk teknik och fysik , 2015Konferansepaper (Fagfellevurdert)
  • 17.
    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
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    Evaluation of Atrial Fibrillation Detection by using Heart Rate Variability analysis2015Konferansepaper (Annet vitenskapelig)
  • 18.
    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
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Seoane, Fernando
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    A Knitted Garment using Intarsia Technique for Heart Rate Variability Biofeedback: Evaluation of Initial Prototype.2015Konferansepaper (Annet vitenskapelig)
  • 19. Abtahi, Farhad
    et al.
    Snäll, Jonathan
    Aslamy, Benjamin
    Abtahi, Shirin
    Seoane, Fernando
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd. KTH-School of Technology and Health.
    Biosignal PI, an Affordable Open-Source ECG and Respiration Measurement System2015Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 15, nr 1, s. 93-109Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 20. Abtahi, Zhohreh
    et al.
    Millati, Ria
    Niklasson, Claes
    Taherzadeh, Mohammad J.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Ethanol production by Mucor indicus at high glucose and ethanol concentrations2010Inngår i: Minerva biotecnologica (Testo stampato), ISSN 1120-4826, E-ISSN 1827-160X, Vol. 22, nr 3-4, s. 83-89Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 21. Abylaev, Mansur
    Kyrgyz textile companies’ resilience features in the post-Soviet regionalization processes2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Kyrgyz textile industry is a fast growing sector since the last decade. The combination of international market conjuncture and low input factors were the main reasons for the development of the textile sector. Legal and political modification of the international trade system is a risk for the whole industry's resilience. The purpose of the paper is to identify the vulnerable points of doing business in the context of economic transformation from planned Soviet to free market economy.

  • 22.
    Adekunle, K.
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Cho, S.-W.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Ketzscher, R.
    Skrifvars, M.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Mechanical properties of natural fiber hybrid composites based on renewable thermoset resins derived from soybean oil, for use in technical applications2012Inngår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 124, nr 6, s. 4530-4541Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 23.
    Adekunle, K.
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Cho, S.-W.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Patzelt, C.
    Blomfeldt, T.
    Skrifvars, M.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Impact and flexural properties of flax fabrics and Lyocell Fiber reinforced bio-based thermoset for automotive and structural applications2012Konferansepaper (Fagfellevurdert)
  • 24.
    Adekunle, K.
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Ghoreishi, R.
    Ehsani, M.
    Cho, S.-W.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, M.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Jute fiber reinforced methacrylated soy bean oil based thermoset composites prepared by vacuum injection molding technique2012Inngår i: Journal of Biobased Materials and Bioenergy, ISSN 1556-6560, E-ISSN 1556-6579, Vol. 6, nr 2, s. 172-177Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 25.
    Adekunle, Kayode
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Bio-based Composites from Soybean Oil Thermosets and Natural Fibers2011Doktoravhandling, med artikler (Annet vitenskapelig)
    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.

  • 26.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Cho, Sung-Woo
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Patzelt, Christian
    Blomfeldt, Thomas
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Impact and flexural properties of flax fabrics and Lyocell fiber-reinforced bio-based thermoset2011Inngår i: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 30, nr 8, s. 685-697Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 27.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Ketzscher, Richard
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    High performance natural fibre hybrid composites based on biobased thermoset resins for use in technical applications2009Konferansepaper (Annet vitenskapelig)
    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.

  • 28.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Patzelt, Christian
    Kalantar, Adib
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Mechanical and Viscoelastic Properties of Soybean Oil Thermoset Reinforced with Jute Fabrics and Carded Lyocell Fiber2011Inngår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 122, nr 5, s. 2855-2863Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 29.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Patzelt, Christian
    Kalantar, Adib
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Mechanical properties of renewable soyean oil thermoset reinforced with jute fabricsand lyocell fiber2011Konferansepaper (Fagfellevurdert)
  • 30.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Synthesis of reactive soybean oils for use as thermoset resins in composites.2007Konferansepaper (Fagfellevurdert)
  • 31.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Åkesson, Dan
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Bakare, Fatimat
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Bio-based thermoset resins from soybean and linseed oils for structural composites2011Konferansepaper (Fagfellevurdert)
  • 32.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Åkesson, Dan
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Synthesis of reactive soybean oils for use as a biobased thermoset resins in structural natural fiber composites2009Inngår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 115, nr 6, s. 3137-3145Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 33.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Åkesson, Dan
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Synthesis of reactive soybean oils for use as biobased thermoset resins in structural natural fibre composites2008Konferansepaper (Fagfellevurdert)
  • 34.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Åkesson, Dan
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Synthetic modification of reactive soybean oils for use as biobased thermoset resins in structural natural fiber composites2008Konferansepaper (Annet vitenskapelig)
  • 35.
    Adekunle, Kayode
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Åkesson, Dan
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Skrifvars, Mikael
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Synthetic modification of reactive soybean oils for use as biobased thermoset resins in structural natural fiber composites2008Inngår i: Polymer Preprints, ISSN 0551-4657, Vol. 49, nr 1, s. 279-Artikkel i tidsskrift (Fagfellevurdert)
  • 36.
    Agetorp, Maria
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Lorentzon, Anna
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Mekanisk återvinning av bomullsfibrer från konsumentavfall: Påverkan på polymerisationsgrad och spinnbarhet2017Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Cellulosans polymerisationsgrad (DP) är en viktig faktor vid utvärdering av möjligheterna till både mekanisk och kemisk återvinning av bomull. Enligt flera studier leder lägre DP till svagare fibrer. I denna rapport har DP hos bomullsfibrer från begagnade jeans undersökts före och efter mekanisk återvinning för att se om återvinningsprocessen eller graden av slitage på de ingående fibrerna har en påverkan på DP. Även möjligheten att spinna garn med de mekaniskt återvunna fibrerna utblandade med jungfruliga bomullsfibrer har undersökts för att se hur andelen återvunna fibrer och graden av slitage på dessa påverkar garnets styrka. Konsumentavfall i form av bomullsjeans, före och efter mekanisk återvinning,  har lösts i  bis(etylendiamin)kopparhydroxidlösning (Cuen). Viskositeten har mätts och cellulosans polymerisationsgrad har beräknats. Eftersom fibrerna inte löstes upp helt var cellulosakoncentrationen i lösningarna okänd. Därför kunde inga klara slutsatser dras om huruvida den mekaniska återvinningen eller graden av slitage på det ingående materialet hade någon påverkan på DP, även om den statistiska analysen visade på att båda variablerna hade en signifikant påverkan. DP hos återvunna fibrer från begagnade jeans är högre än vad som krävs för framställning av både viskos och lyocell, vilket gör att kemisk återvinning av denna form av konsumentavfall kan vara möjlig att utveckla industriellt. Jungfrulig bomull har ringspunnits tillsammans med 20 % och 50 % återvunna fibrer. Spinningen av garn med 50 % återvunna fibrer var på grund av upprepade garnbrott alltför tidskrävande för vara lämlig för storskalig produktion. Dragstyrkan hos ett ringspunnet bomullsgarn med 20 % återvunna fibrer försämrades inte jämfört med ett garn av 100 % jungfrulig bomull, utan kunde tvärtemot förbättras beroende på spinninställningar och kvaliteten på de återvunna fibrerna. Inblandning av 20 % mindre slitna fibrer gav ett starkare garn än 20 % slitna fibrer. Dock spanns endast en bobin av varje garn och därför krävs en större studie för att få ett större statistiskt underlag innan några mer generella slutsatser kan dras.

  • 37.
    Aghajani, M
    et al.
    Department of Chemical Engineering, Babol Noushirvani University of Technology.
    Rahimpour, A
    Department of Chemical Engineering, Babol Noushirvani University of Technology.
    Amani, H
    Department of Chemical Engineering, Babol Noushirvani University of Technology.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Rhamnolipid as new bio-agent for cleaning of ultrafiltration membrane fouled by whey2018Inngår i: Engineering in Life Sciences, ISSN 1618-0240, E-ISSN 1618-2863, Vol. 18, nr 5, s. 272-280Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work, rhamnolipid biosurfactant as an eco-friendly and biodegradable cleaning agent was produced by Pseudomonas aeruginosa bacteria and was used to evaluate the chemical cleaning efficiency of whey fouled ultrafiltration membranes. Thin layer chromatography (TLC) and Fourier transform infrared spectroscopy (FTIR) confirmed the successful synthesis of rhamnolipid. The produced rhamnolipid was compared to chemical cleaners including sodium hydroxide (NaOH), sodium dodecyl sulfate (SDS) and Tween 20. Ultrafiltration membranes used for fouling and cleaning analysis were prepared using phase inversion via immersion precipitation technique. For studying the fouling mechanisms, Hermia's model adapted to cross-flow was used. From the fouling mechanism experiments, it was found that the complete blocking and cake formation were the dominant fouling mechanisms. The highest values of cleaning efficiency were achieved using rhamnolipid and NaOH as cleaning agents with the flux recovery of 100%, but with considering the low concentration of the rhamnolipid used in the cleaning solution compared to NaOH (0.3 versus 4 g/L for NaOH), its application is preferred. 

  • 38.
    Agnhage, Tove
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. University Lille 1, France; Soochow University, China.
    Eco-designed functionalization of polyester fabric2017Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    There is an increased awareness of the textile dyeing and finishing sector’s high impact on the environment due to high water consumption, polluted wastewater, and inefficient use of energy. To reduce environmental impacts, researchers propose the use of dyes from natural sources. The purpose of using these is to impart new attributes to textiles without compromising on environmental sustainability. The attributes given to the textile can be color and/or other characteristics. A drawback however, is that the use of bio-sourced dyes is not free from environmental concerns. Thus, it becomes paramount to assess the environmental impacts from using them and improve the environmental profile, but studies on this topic are generally absent.

    The research presented in this thesis has included environmental impact assessment, using the life cycle assessment (LCA) tool, in the design process of a multifunctional polyester (PET) fabric using natural anthraquinones. By doing so an eco-design approach has been applied, with the intention to pave the way towards eco-sustainable bio-functionalization of textiles.

    The anthraquinones were obtained from the root extracts of the madder plant (Rubia tinctorum L.), referred to as madder dye. The research questions were therefore formulated related to the use of madder dye. Three research questions have been answered: (I) Can madder dye serve as a multifunctional species onto a PET woven fabric? (II) How does the environmental profile of the dyeing process of PET with madder dye look like, and how can it be improved? (III) What are the main challenges in using LCA to assess the environmental impacts of textile dyeing with plant-based dyes?

    It is concluded that there is a potential for the madder dye to serve as a multifunctional species onto PET. Based on the encouraging result, a recommendation for future work would be to focus on the durability of the functionalities presented and their improvement potential, both in exhaustion dyeing and pad-dyeing. LCA driven process optimization of the exhaustion dyeing enabled improvement in every impact category studied. However, several challenges have been identified which need to be overcome for the LCA to contribute to the sustainable use of multifunctional plant-based species in textile dyeing. The main challenges are the lack of available data at the research stage and the interdisciplinary nature of the research arena. It is envisaged that if these challenges are addressed, LCA can contribute towards sustainable bio-functionalization of textiles. 

  • 39.
    Agnhage, Tove
    et al.
    Högskolan i Borås, Institutionen Textilhögskolan.
    Nierstrasz, Vincent
    Högskolan i Borås, Institutionen Textilhögskolan.
    Perwuelz, A.
    Guan, J.P.
    Chen, G.Q.
    Eco-design innovative methods for fabric finishing2014Konferansepaper (Annet vitenskapelig)
  • 40.
    Agnhage, Tove
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Nierstrasz, Vincent
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Zhou, Yuyang
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Soochow University.
    Guan, Jinping
    Soochow University.
    Perwuelz, Anne
    ENSAIT.
    Behary, Nemeshwaree
    ENSAIT.
    Bioactive and multifunctional textile using plant-based madder dye: Characterization of UV protection ability and antibacterial activity2017Inngår i: Fibers And Polymers, ISSN 1229-9197, E-ISSN 1875-0052, ISSN 1229-9197, Vol. 18, nr 11, s. 2170-2175Artikkel i tidsskrift (Fagfellevurdert)
  • 41.
    Agrawal, Tarun Kumar
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. ENSAIT/GEMTEX.
    Campagne, Christine
    ENSAIT/GEMTEX, Roubaix, France.
    Koehl, Ludovic
    ENSAIT/GEMTEX, Roubaix, France.
    Development and characterisation of secured traceability tag for textile products by printing process2018Inngår i: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Product security is one of the major concerns in the textile industry. Every year, fashion brands suffer significant loss due to counterfeit products. Addressing this, the paper introduces a secured tag for traceability and security of textile products. The proposed tag is unclonable, which can be manufactured using conventional screen-printing process. Further, it can be read using a smartphone camera to authenticate the product and trace its history. Consequently, imparting additional functionality to the textile through surface modification. To validate its applicability, the study experimentally investigates the durability and readability of the developed secured tag using three different binders on polyester and cotton textiles substrates. A comparison is presented with an in-depth analysis of surfaces and binders interaction at different stages of the secured tag lifecycle, i.e. before print, after print, after wash and after abrasion cycles. The methodology and findings of the study can also be useful for other manufacturing domains dealing with the printing process.

  • 42.
    Ahl, Karin
    et al.
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd.
    Svenningsson, Frida
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd.
    Ett tack räcker långt: En kvalitativ studie om arbetsmotivation på ettserviceföretag2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Arbetsmotivation är ett ämne inom arbetsvetenskapen som vi anser intressant att få en djupare förståelse kring. Vi har genomfört en kvalitativ studie utifrån ett fenomenologiskt perspektiv. Syftet var att ta del av respondenternas subjektiva livsvärldar och undersöka hur medarbetare på ett serviceföretag motiveras i sitt dagliga arbete samt att fånga upp ifall det finns motiverande omständigheter som saknas. Vi valde att använda oss av ett hälso- och skönhetsföretag som utmärks av arbetsförhållanden som långa arbetsdagar, obekväma arbetstider och en stressig arbetsmiljö.

    Vi samlade in vår empiri genom semistrukturerade intervjuer med sju medarbetare på vårt aktuella företag. Resultaten visar att medarbetarna ser faktorer som samhörighet mellan kollegor, meningsfulla arbetsuppgifter, personligt intresse i yrket samt ledarskapet på företaget som mycket viktiga för arbetsmotivationen. De faktorer som medarbetarna saknade i sitt dagliga arbete var uppskattning, både personlig och materiell, delaktighet i arbetet, kollektiva prestationsmål och kompetensutveckling.

    Vi diskuterar vårt resultat utifrån; Herzbergs tvåfaktorsteori, Maslows behovshierarki, Hackman & Oldhams motivationsteori, samt Deci och Ryans Self Determination Theory. Vi använder oss även av tidigare forskning ut förd av Wiley, Achim, Dragolea, Bălan, Grant, Basford och Offermann.

    Slutsatsen från vår studie är bland annat att det inte är stora och kostsamma belöningar som motiverar medarbetarna i det dagliga arbetet, utan ett enkelt tack räcker långt.

  • 43.
    Ahl, Victor
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Henriksson, Erik
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Energianalys och förslag på energieffektivisering: Nohabgatan 11, Trollhättan2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    I denna rapport gjordes en energianalys av en tegelbyggnad med mestadels kontors- och verkstadsverksamhet. Energianalysen innefattade en värmebalans och en elbalans. Resultatet för dessa balanser låg till grund för några förslag på åtgärder för energieffektivisering. Syftet var att göra en energianalys med avseende på värme- och kylbehov samt elanvändning av en byggnad i Trollhättan samt ge förslag på energieffektiviserande åtgärder. Med utgångspunkt i ritningar av byggnaden samt indata för köpt fjärrvärme och el för 2017 sattes en värmebalans och en elbalans upp. Utifrån dessa balanser genomfördes beräkningar för att ge en överskådlig bild av vad värmen och elen går åt till i byggnaden. Värmeförlusterna bestod i transmissions-, ventilations-, infiltrations- och avloppsförluster. Värmetillförseln bestod i köpt fjärrvärme, solinstrålning, internvärme från elapparater och personer i byggnaden samt värmeförluster från varmvattenrör och varmvattenberedare som bidrog till uppvärmningen. Elanvändningen bestod till största delen av belysning, datorer med tillbehör, köksutrustning, luftbehandlingssystem, pumpar, kylsystem och servrar. Den köpta fjärrvärmen var 863 823 kWh och den köpta elen var 482 395 kWh, varav 119 179 kWh beräknades kunna tillgodogöras byggnaden. Solinstrålningen beräknades bidra till uppvärmningen med 35 249 kWh. Av förlusterna var transmissionen den största posten med 826 270 kWh följt av infiltrationsförluster på 131 258 kWh och ventilationsförluster på 77 418 kWh. Avloppsförlusterna samt värmetillförsel genom värmeförluster från varmvattenrör och varmvattenberedare var i sammanhanget små. Resultaten av beräkningarna visade att byggnaden hade en energiprestanda på 130 kWh/(m2, år) varav elanvändning på 21 kWh/(m2, år).Energieffektiviserande åtgärder som föreslogs var till exempel tilläggsisolering, byte av belysning, översyn av drift av ventilations- och värmesystem, byte av pumpar, installering av solceller och behovsstyrd ventilation.

  • 44.
    Ahlfvengren, Ellinor
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Sandberg, Minna
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Effekter av en integrerad artikelstandardisering ochinförande av variantmoduler2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    I denna kandidatuppsats undersöks hur ett förändrat produktionsupplägg påverkar ett svensktproducerande företags konkurrenskraft när konkurrensen från globala lågprisalternativ medkort leveranstid ökar. Genom att byta produktionsupplägg från produktion mot lager tillmontering mot order och genom att standardisera artiklar och till viss del modulindelaprodukter kan kundorderpunkten flyttas bak i produktionsprocessen. Komponenternamonteras då ihop till slutprodukt först när kundordern anlänt, vilket bidrar till att antaletlagerförda variantartiklar minskar vilket är något som bidrar till en lägre kapitalbindning.Kostnadsbesparingen detta medför kan användas till att utveckla ordervinnande egenskaper.Exempel på sådana egenskaper är att förbättra kvaliteten på produkterna, öka mervärdet,förlänga garantin samt stärka varumärket som ett mer miljövänligt alternativ.

  • 45.
    Ahlnäs, Simon
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Börjesson, Tobias
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Tids- och kostnadseffektivitet vid intermodala transporter2017Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This study aims to explore effectiveness within intermodal transportation of semi-trailers based on the variables cost and time. Intermodal transport can be explained as a transportation of a carrier, from the origin to the final destination, using two or more modes of transport (Crainic & Kim, 2007 p.467). This study focuses on the two modes of transport rail and road. The rail transportation has big advantages towards other modes of transport since it has less impact on the environment, given that the energy is produced in Sweden (Trafikverket 2017) but there are more benefits to be utilized. The rail transportation is generally more profitable on distances greater than 500 km, thus it can transport high volumes of goods over long distances for a low cost. The fixed costs that´s added in the terminals and the rail transports low degree of flexibility compared to the road transport is the primary reasons why rail transportation isn´t profitable on shorter distances. This study has made a market research to see where the final destinations for the imported semi-trailers are located in Sweden and Norway. This, to see where there are potential to develop and create new rail shuttles from Port of Gothenburg to dry ports across the Swedish and Norwegian inland for transportation of semi-trailers. Interviews have been conducted with carriers to create a more correct view of the current situation. Study results show that the greatest volumes of the transported semi-trailers ends up in the areas around Helsingborg and Stockholm, with the region around Gothenburg excluded. Dry ports positioned in this area show the best potential for development of new rail shuttles. The results from conducted interviews with carriers express that time is the most important aspect for their operation and their clients, that is also the reason why they don´t use the railway for transportation of semi-trailers. Carriers also consider the trains to be unreliable and the railway operation in Port of Gothenburg has so far not been operating well enough for them. The result show that 38 percent of the imported semi-trailers have their final destination in the area around Gothenburg and naturally it´s not possible for the railway to compete with the road transport at such a short distance. In order for the railway to compete with the road transport, rail shuttles to regions with high flows of semi-trailers must be developed to not loose in time and flexibility. Thus, the railway transportation has other opportunities than just transportation. In dry ports there are opportunities for storage of goods, which is generally cheaper than in the port and simultaneously create time gains in the final transportation, thus the goods are closer to the customer. Port of Gothenburg can compete with other ports, which are geographically closer to a certain customer, through more rail shuttles with more frequent departures and then take more market shares within Nordic transportation.

  • 46.
    Ahlström, Peter
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Aim, Karel
    Dohrn, Ralf
    Elliott, J Richard
    Jackson, George
    Jaubert, Jean Noël
    Rebello de A. Macedo, Maria Eugénia
    Pokki, Juha-Pekka
    Reczey, Kati
    Victorov, Alexey
    Fele Zilnik, Ljudmila
    Economou, Ioannis
    A Survey of the Role of Thermodynamics and Transport Properties in ChE University Education in Europe and the USA2010Inngår i: Chemical Engineering Education, ISSN 0009-2479, Vol. 44, nr 1, s. 35-43Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Thermodynamics and Transport Properties (TTP) is a central subject in the majority of chemical engineering curricula worldwide and it is thus of interest to know how it is taught today in various countries if chemical engineering education is to be improved. A survey of graduate thermodynamics education in the USA was performed a few years ago by Visco et al. [1] but as far as we know no systematic study of the undergraduate thermodynamics education has been performed, at least in recent years. In the present study, a survey about TTP education in Europe and the USA is presented. Results were obtained from nearly twenty different European countries and the USA and in total answers from about 150 universities were used for this study. The study is performed under the auspices of the Working Party of Thermodynamics and Transport Properties of the European Federation of Chemical Engineering. The survey was performed using a web based surveying system for which invitations were sent out to the universities by local representatives who were responsible for one or more countries each. Of the universities that answered more than 70 % offer BSc education 65 % offer MSc education and 55 % offer PhD education. Most universities offer at least two courses of thermodynamics. The following discussion is mainly based on the first two (undergraduate) courses reported. Half of these are taught to chemical engineers exclusively whereas the rest are taught with other branches of engineering, mainly mechanical and / or process engineering. In general two sets of course lengths were observed, corresponding either to a full semester of full time studies or to quarter of a semester. Most courses are centered around lectures and exercise classes with little or no laboratory work whereas home assignments are given in the vast majority (70-80 %) of the courses. The first course is mainly centered around the first and second law of thermodynamics whereas the second course is frequently more concentrated on phase equilibria. Both of these courses are mainly comprising of classical thermodynamics whereas the molecular interpretation often is touched upon. An analysis of the differences between thermodynamics education in Europe and the USA in presently being undertaken and results from this will also be presented. An investigation of the use of thermodynamics within industry is also on-going within the Working Party and results will be reported in the near future. [1] S.K.Dube, D.P. Visco, Chem. Eng. Ed., 2005, 258-263.

  • 47.
    Ahlström, Peter
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Aim, Karel
    Dohrn, Ralf
    Elliott, J. Richard
    Jackson, George
    Jaubert, Jean-Noel
    Rebello de A. Macedo, Maria Eugénia
    Pokki, Juha-Pekka
    Reczey, Kati
    Victorov, Alexey
    Fele Zilnik, Ljudmila
    Economou, Ioannis
    A Survey of Thermodynamics and Transport Properties in Chemical Engineering Education in Europe and the USA2008Inngår i: Proceedings of the 100th Annual Meeting of the American Institute for Chemical Engineering, 2008Konferansepaper (Fagfellevurdert)
  • 48.
    Ahlström, Peter
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Gebäck, Tobias
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Johansson, Erik
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Bolton, Kim
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Water absorption in polymers2010Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    In this work two different examples of water absorbtion in polymers are studied by Monte Carlo simulations. Both of them are of large technical and commercial impotance. The first example is the water absorption in polyethylene cables where the water absorption plays a crucial role in the degradation of the cable insulation and thus should be as low as possible. The second example is bio-based superabsorbents made from denatured protein where water absorption capability is the prime desired property. Methods Gibbs Ensemble Monte Carlo simulations [1] were used to study the hydration of polymers. All simulations are performed with two boxes, one of which is filled with water at the start of the simulation, whereas the other contains polymer molecules and possible ions. The polymer molecules are not allowed to swap boxes whereas the water molecules are allowed to do so thus constituting an osmotic Gibbs ensemble [2]. For the polyethylene a connectivity-altering algorithm was used whereas the protein molecules were simulated using a side-chain regrowth model in addition to traditional Monte Carlo moves. For the polyethylene, the TraPPE [3] force field was used and the protein molecules, the Amber force field [4] was used. Water was modelled using simple point charge models [5]. Electrostatic interactions are treated using Ewald summation methods. The protein molecules were of different amino acid compositions and in different conformations, e.g., β-turns and random coils obtained using the amorphous cell method[6]. Studies were made with different degrees of charging on, e.g., lysine side chains mimicking different ionization states. Results The studies of polyethylene revealed the importance of ions left from the polymerisation catalyst for the absorbtion of water and the concomitant degradation of polyethylene cable insulation. Also the absorption properties of the protein molecules is strongly related to the presence of charged groups and fully charged protein molecules absorb large amounts of water. However, neither native nor denatured protein molecules show superabsorbing properties (i.e. absorbing hundreds of times their own mass) as they show in experimental studies and the reasons for this discrepancy will be discussed. References 1. A.Z. Panagiotopoulos, Mol. Phys. 61, 813 (1987). 2. E. Johansson, K. Bolton, D.N. Theodorou, P. Ahlström, J. Chem. Phys., 126, 224902 (2007). 3. M.G. Martin, and J.I. Siepmann, J. Phys. Chem. B, 103, 4508-4517 (1999). 4. W.D. Cornell, P. Cieplak, C.I. Bayly, I.R. Gould, K.M. Merz Jr, D.M. Ferguson, D.C. Spellmeyer, T. Fox, J.W. Caldwell, P.A. Kollman (1995). J. Am. Chem. Soc. 117, 5179–5197. 5. H. J. C. Berendsen, J. P. M. Postma and W. F. van Gunsteren, in Intermolecular Forces, B. Pullman, ed. (Reidel, Dordrecht, 1981) p. 331; H. J. C. Berendsen, J. R. Grigera and T. P. Straatsma, J. Phys. Chem. 91, 6269 (1987). 6. D.N. Theodorou, U.W. Suter, Macromolecules, 18, 1467 (1985).

  • 49.
    Ahlström, Peter
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Moodley, Suren
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Bolton, Kim
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Ramjugernath, D.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Computer Simulations of Vapor-Liquid-Liquid Equilibria Involving Hydrocarbons and Water2008Inngår i: Proceedings of the 100th Annual Meeting of the American Institute for Chemical Engineering, 2008, CHPC National Meeting, Durban, South Africa, December 9-10, 2008, AlChe Annual Meeting, Philadelphia, November 15-21, 2008, 2008Konferansepaper (Annet vitenskapelig)
  • 50.
    Ahlvik, Isak
    et al.
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd.
    Berg, Lina
    Högskolan i Borås, Akademin för vård, arbetsliv och välfärd.
    Att inte sminka en gris: En kvalitativ studie om hur en kommun i Västsverige tolkar och förhåller sig till employer branding2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Behovet av arbetskraft förväntas öka inom offentlig sektor och samtidigt som detta ökar upplevs tillgången till rätt arbetskraft minska. Genom att aktivt arbeta med employer branding sägs arbetsgivare kunna skapa attraktionskraft gentemot nya arbetstagare. Men frågan är om employer branding är en övergående trend bland dagens arbetsorganisationer, eller om yrkesverksamma inom området kommit att se det som en naturlig del i HR-arbetet. Med detta som utgångspunkt är studiens syfte att undersöka hur anställda inom en kommun i Västsverige tolkar och förhåller sig till begreppet employer branding. Studien har genomförts med en kvalitativ forskningsstrategi och data hämtades in genom en semistrukturerad intervjumetod.

    Resultatet visar att en stor orsak till att respondenterna anser det viktigt att arbeta med employer branding hänger samman med kommunens förmåga att rekrytera kompetent arbetskraft. Genomgående finns en enhetlig bild av begreppet. Dock belyser respondenterna på central nivå vikten av att ha etablerade värdeord i organisationen medan de på lokal nivå riktar större fokus på de anställdas situation. På central nivå har de tagit fram en kompetensförsörjningsplan som samtliga verksamheter till viss del måste förhålla sig till när det gäller insatser kopplade till employer branding. Samtidigt har också varje enskild förvaltning stor frihet att själva välja hur de vill arbeta med dessa frågor. Att arbeta med employer branding både externt och internt är något som upplevs som viktigt. De externa insatserna kopplas till marknadsföring, främst i form av icke-produktrelaterad sådan. Medan de interna insatserna som framhävs är vikten att skapa goda arbetsförhållanden.

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