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  • 1451.
    Ranjbar, Parivash
    Örebro University, School of Science and Technology.
    Omgivningens ljud fångas upp av nytt hjälpmedel2010In: AudioNYTT, ISSN 0347-6308, Vol. 37, no 4, p. 14-17Article in journal (Other academic)
  • 1452.
    Ranjbar, Parivash
    Örebro University, School of Science and Technology.
    Sensing the Environment: a Perceptual and Psychosocial Analysis of Events in the Surroundings from a Handicap Perspective. Medicinteknikdagarna Örebro2007Conference paper (Refereed)
  • 1453.
    Ranjbar, Parivash
    Örebro University, School of Science and Technology.
    Sensing the Environment: a Perceptual and Psychosocial Analysis of Events in the Surroundings from a Handicap Perspective. Missisauga2003Conference paper (Other academic)
  • 1454.
    Ranjbar, Parivash
    Örebro University, School of Science and Technology.
    Sensing the Environment: a Perceptual and Psychosocial Analysis of Events in the Surroundings from a Handicap Perspective. Perth2007Conference paper (Other academic)
  • 1455.
    Ranjbar, Parivash
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Örebro University, School of Science and Technology.
    Signal Processing Methods for Improvement of Environmental Perception of Persons with Deafblindness2014In: Advanced Materials Research, ISSN 1022-6680, Vol. 902, p. 398-404Article in journal (Refereed)
    Abstract [en]

    Environmental perception is a functional area that is severely limited in persons with  deafblindness (DB) who belong a category of people with severe disabilities. Monitor is a vibratory aid developed with the aim to improve environmental perception of persons with DB. The aid consists of a mobile phone with an application connected to a microphone and vibrator. Monitor picks up the sounds produced by events by microphone, processes the sound using an algorithm programmed as an application in the mobile phone and then presents the signal via the vibrator to the persons with DB to be sensed and interpreted. In previous laboratory studies, four algorithms (AM, AMMC, TR, and TRHA) were developed based on modulating, and transposing principles.

    The algorithms were tested by persons with normal hearing/hearing impairment and selected as good candidates to improve vibratory identification of environmental sounds. In this on-going the algorithms are tested by 13 persons with congenital D and five persons with DB using Monitor in a realistic environment, living room, kitchen or office. Forty five recorded environmental sounds were used as test stimuli.

    The subjects tested the algorithms two times, Test and Retest each including a test session

    initiated by a training session. The four algorithms were tested in four days at Test and four days at Retest in total eight test days. Each test day began with a training session where a sound was presented as vibrations to be sensed by the person with the aim to remember its pattern and identity.

    The 45 sounds were grouped in four groups where an specific algorithm was chosen to process an specific sound group in a specific day. At the test session a sound was presented and the person was given 5 randomly chosen sound alternatives to choose the one as represented sound. The algorithms were different for different sound groups during four different test days so all algorithms were used to process all sounds. The algorithms were tested a second time, Retest, in same way as in Test.

    The mean value of identification of environmental sounds varied between 74.6% and 84.0% at Test and between 86.9% and 90.4% at Retest. The identification results at Retest were

    significantly improved (p<0.01) for all algorithms after a relatively short time of training indicating a good learning effect. At Test the algorithm AM was significantly better than the algorithms AMMC and TRHA (p< 0.01) and the algorithm TR was better than TRHA (p<0.01).

    The algorithms AM, AMMC, and TR were selected as good candidates to be implemented in the Monitor to improve environmental perception.

  • 1456.
    Ranjbar, Parivash
    Örebro University, School of Science and Technology.
    Sinnena, konst och vetenskap: att känna omvärlden2007Conference paper (Other academic)
  • 1457.
    Ranjbar, Parivash
    et al.
    Örebro University, School of Science and Technology.
    Akner-Koler, Cheryl
    Örebro University, School of Hospitality, Culinary Arts & Meal Science.
    Konstfack designar hjälpmedel2010In: Audio-nytt, ISSN 0347-6308, Vol. 37, no 4, p. 24-26Article in journal (Other academic)
  • 1458.
    Ranjbar, Parivash
    et al.
    Örebro University, School of Science and Technology.
    Borg, Erik
    Örebro University, School of Health and Medical Sciences.
    Philipson, Lennart
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Auditive identification of signal-processed environmental sounds: monitoring the environment2008In: International Journal of Audiology, ISSN 1499-2027, E-ISSN 1708-8186, Vol. 47, no 12, p. 724-736Article in journal (Refereed)
    Abstract [en]

    The goal of the present study was to compare six transposing signal-processing algorithms based on different principles (Fourier-based and modulation based), and to choose the algorithm that best enables identification of environmental sounds, i.e. improves the ability to monitor events in the surroundings. Ten children (12-15 years) and 10 adults (21-33 years) with normal hearing listened to 45 representative environmental (events) sounds processed using the six algorithms, and identified them in three different listening experiments involving an increasing degree of experience. The sounds were selected based on their importance for normal hearing and deaf-blind subjects. Results showed that the algorithm based on transposition of 1/3 octaves (fixed frequencies) with large bandwidth was better (p<0.015) than algorithms based on modulation. There was also a significant effect of experience (p<0.001). Adults were significantly (p<0.05) better than children for two algorithms. No clear gender difference was observed. It is concluded that the algorithm based on transposition with large bandwidth and fixed frequencies is the most promising for development of hearing aids to monitor environmental sounds.

  • 1459.
    Ranjbar, Parivash
    et al.
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Borg, Erik
    Örebro University Hospital, Örebro, Sweden.
    Philipson, Lennart
    Örebro University, School of Science and Technology.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Sensing the environment: A perceptual and psychosocial analysis of events in surroundings from a handicapped perspective2003Conference paper (Other academic)
  • 1460.
    Ranjbar, Parivash
    et al.
    Örebro University, School of Science and Technology.
    Remes, Johan
    Alexandersson, Linda
    Axelhed, Ingrid
    Timstock hjälper dövblinda uppfatta tiden2010In: AudioNYTT, ISSN 0347-6308, Vol. 37, no 4, p. 28-30Article in journal (Other academic)
  • 1461.
    Ranjbar, Parivash
    et al.
    Örebro University Hospital. Örebro University, School of Health Sciences. Institutionen för naturvetenskap och teknik, School of Science and Technology.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Akner Koler, Cheryl
    Konstfack, Industridesignprogrammet.
    Borg, Erik
    Audiologiskt forskningscentrum i Örebro, Region Örebro län, Örebro, Sweden.
    Identification of vibrotactile morse code on abdomen and wrist2017In: International Journal of Engineering Technology and Scientific Innovation, ISSN 2456-1851, Vol. 1, no 4, p. 351-366Article in journal (Refereed)
    Abstract [en]

    Morse code has been used as a communications system at a distance to transmit text through tone or light pulses. This comparative study aims to test and evaluate the vibrotactile identification of Morse coded signals communicating instructions for movement. The pulses were presented on abdomen and wrist among 14 males (40-85 yr) experienced in acoustic Morse code and the rate of pulses was 12 words per minute using a Vibration Motor mounted in a plastic holder. There identification results were statistically significantly better on wrist compared to abdomen. Words were identified significantly better on the wrist as compared to abdomen but the identification results of the letters were equally good in both placements. There was a negative correlation between age and the pooled identification results tested on wrist PCC r=-0.45 (p<0.02). The participants rank ordered the wrist, over the abdomen, as the best place for positioning the vibrator. The results support haptic/tactile interaction research in positioning and communication system. Our future plans are to apply the results to the project "Ready Ride" for instructions for horseback riding for people with deafblindness as well as activity and movement for elderly people with impaired vision and hearing.

  • 1462.
    Ranjbar, Parivash
    et al.
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Örebro University Hospital, Örebro, Sweden.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Akner-Koler, Cheryl
    Konstfack, University Collage of Arts, Stockholm, Sweden.
    Borg, Erik
    Örebro University Hospital, Örebro, Sweden.
    Haptic Technical Aids for EnvironmentalPerception, Time Perception and Mobility (in a Riding Arena) for Persons with Deafblindness2014In: HAPTICS: NEUROSCIENCE, DEVICES, MODELING, AND APPLICATIONS, PT II, Springer Berlin/Heidelberg, 2014, Vol. 8619, p. 488-490Conference paper (Other academic)
    Abstract [en]

    This demonstration presents three vibrotactile aids to support personswith deafblindness. One aid, Monitor, consists of a microphone that detectssounds from events which are then processed as a signal that is adapted to thesensitivity range of the skin. The signal is sent as vibrations to the user withdeafblindness, who can interpret the pattern of the vibrations in order to identifythe type and position of the event/source that produced the sounds. Another aid,Distime, uses a smart phone app that informs the user with cognitive impairmentand deafblindness about a planned activity through; audio, visual or tactileinteraction that is adapted to the abilities of each individual. The last aid, Ready-ride, uses two smart phones and up to 11 vibrators that help the horse back riderwith deafblindness to communicate with the instructor from a distance viavibrators placed on different parts of the riders body e.g. wrist, thigh, back, ankle.

  • 1463.
    Ranjbar, Parivash
    et al.
    Audiological Research Centre, Örebro University Hospital, Örebro, Sweden.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Akner-Koler, Cheryl
    Industridesignprogrammet, Konstfack, Stockholm, Sweden.
    Borg, Erik
    Audiological Research Centre, Örebro University Hospital, Örebro, Sweden.
    Haptic technical aids for improvement of Time perception, Environmental perception and Mobility (in a riding arena) and Music perception for persons with deafblindness2014Conference paper (Refereed)
    Abstract [en]

    Introduction: Persons with deafblindness have frequently difficulties in e.g. environmental perception, spatial awareness, time perception, social participation and music experience. To experience independence, participation and control, adequate processing of sensory information is important.

  • 1464.
    Ranjbar, Parivash
    et al.
    Örebro University, School of Science and Technology.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Akner-Koler, Cheryl
    Konstfack, University College of Arts, Crafts and Design in Sweden.
    Borg, Erik
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Monitor: a vibrotactile aid to improve environmental perception of persons with severe hearing impairment/deafblindness2012In: TeMA Hörsel, 2012, 2012Conference paper (Other academic)
  • 1465.
    Ranjbar, Parivash
    et al.
    Audiological Research Centre, University Hospital At Örebro, Örebro, Seden.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Borg, Erik
    Audiological Research Centre University Hospital At Örebro, Örebro, Sweden.
    Akner-Koler, Cheryl
    Theoretical &Applied Aestetics At Industrial Design, Konstfack, University College Of Arts, Crafts And Design, Stockholm, Sweden.
    Haptic technical aids Distime, Monitor, Good vibrations, Ready-Ride and VibroBraille for improvement of Time perception, Environmental perception, music perception, mobility and communication for persons with deafblindness: Tactile aids2017In: Tactile aids, Ahlborg, 2017Conference paper (Refereed)
    Abstract [en]

    There are approx. 1300 people with deafblindnes (DB) in Sweden where about 100 of them are with complete deafness (D) and blindness (B). The number will reach about 30000 if we also include people older than 65 with severe visual impairment (VI) and hearing impairment (HI) and several million worldwide.  Difficulties in time perception, environmental perception, music perception, mobility, social participation and communication are examples of their frequent problems. Five haptic technical aids are developed to reduce these problems. Distime is an application in a smart phone to inform the user about the planned activities by choosing different information channel depending on the sense that works and her/his ability. The activities can be presented as sound or vibrations for users with B; as images, movies and also as vibrations for those with D and vibrations for those with DB. Monitor informs users with D and DB about ongoing events with the aim to increase their environmental perception. Using an specific algorithm for environmental sounds, it converts the audible sounds produced by events to sensible vibrations which can be sensed and interpreted as events. Good Vibrations uses an specific algorithm for music and converts the audible music to vibrations which can be felt with the aim to increase music perception for users with severe HI, D/DB as well as for users with normal hearing who want extra enhanced experience of the music. Ready-Ride is a positioning and communication aid to improve the mobility of riders with severe VI, B or DB. It is used for distance communication between a trainer and a rider with VI where the trainer can send information about the rider’s position give commands or feedback about the riding. VibroBraille informs users with B/DB about the short notifications received from different applications in her/his cell phone. It converts the text to its corresponding Braille pattern where the active points are vibrating.

  • 1466.
    Rasha, Zaki
    Örebro University, School of Science and Technology.
    IT-stöd för effektiv drivmedelslageravstämning2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport redogör för en webbapplikation med ett användargränssnitt som visar Preems volymdifferenser. Syftet med arbetet var främst utveckla en enklare metod för att spåra oförklarliga differenser i Preems lagerkontroll. Rapporten tar även upp grundläggande metoder för att anpassa webbapplikationer för olika företagsmodeller.

    Det resulterande systemet blev en webbapplikation med ett användargränssnitt för lagerkontroll, där man enkelt kan navigera. Webbapplikationen reagerar på varningar och genererar automatiskt anpassade tabeller/grafer.

  • 1467.
    Rashid, Hesho
    Örebro University, School of Science and Technology.
    LoopMe: Rapportgenerator2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis project aims to further develop the functionality of an Android application at a company, with focus on statistics and visualization of graphs. The application is used mainly within the school sector in which teachers have been able to get information from students regarding their well-being, what they have learnt and various aspects via reports. Since these have been the central point in the relation between them, it became important for teachers to gain a better understanding of it. This type of visualization has been one of the main aspirations in the new version of the application, and this has been the main task to develop. By using the tool Chart.js, this form of visualization could be achieved.

     

    Chart.js is a JavaScript library which generates charts and graphs. The advantages of this tool is that it provides a variety of graphs and is independent, which means that it is not in need of any other framework or similar to function. The graphs are stored locally on the company’s server or its computer and not of a third party. This is a further advantage because the company does not need to be dependent on the distributor. In situations when data is confidential (which was relevant in this situation), the company will not be exposed of ethical problems with having to have data on a third party server.

  • 1468.
    Rashid, Jayedur
    et al.
    Örebro University, School of Science and Technology.
    Broxvall, Mathias
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    A middleware to integrate robots, simple devices and everyday objects into an ambient ecology2012In: Pervasive and Mobile Computing, ISSN 1574-1192, E-ISSN 1873-1589, Vol. 8, no 4, p. 522-541Article in journal (Refereed)
    Abstract [en]

    The fields of ambient intelligence, distributed robotics and wireless sensor networks are converging toward a common vision, in which ubiquitous sensing and acting devices cooperate to provide useful services in the home. These devices can range from sophisticated mobile robots to simple sensor nodes and even simpler tagged everyday objects. In this vision, a milkbox left on the table after the user has left the home could ask the service of a mobile robot to be placed back in the refrigerator. A missing ingredient to realize this vision is a mechanism that enables the communication and interoperation among such highly heterogeneous entities. In this paper, we propose such a mechanism in the form of a middleware able to integrate robots, tiny devices and augmented everyday objects into one and the same system. The key moves to cope with heterogeneity are: the definition of a tiny, compatible version of the middleware, that can run on small devices; and the concept of object proxy, used to make everyday object accessible within the middleware. We describe the concepts and implementation of our middleware, and show a number of experiments that illustrate its performance.

  • 1469.
    Rasmussen, Alice
    Örebro University, School of Science and Technology.
    Tillagningsmetodens påverkan på perfluorerade ämnen i Vätternröding2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna studie har undersökt tre tillagningsmetoder; kokning, stekning och ugnsbakning för att se om halten per- och polyfluorerade alkylsubstanser (PFAS) förändras efter tillagning i vätternröding. Proverna har testats för perfluoralkyl sulfonat (PFSA)/perfluorkarboxylsyror (PFCA), polyfluoroalkyl fosfater (PAPs) och perfluoroktan sulfonamid (FOSA)/ perfluoro-1-oktansulfonamid etanol (FOSE). Den substans som hittades i högst halt var perfluoroktansulfonat (PFOS). Resultatet visar att tillagad röding har lägre halter PFAS än färsk röding vilket tyder på att tillagningsmetoden påverkar PFAS, detta är intressant då tidigare forskning inte gett entydiga resultat. Resultatet tyder inte på någon risk för normalkonsumenter att överstiga tolerabelt dagligt intag (TDI) för PFAS vid konsumtion av vätternröding.

  • 1470.
    Rasmussen, Nichlas
    Örebro University, School of Science and Technology.
    Operator unit simulator2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis was developed as an assignment from Atlas Copco where the goal was to develop

    software that could simulate an OU (Operator Unit) in a PC environment. Atlas Copco’s

    proprietary radio-control system for mining vehicles consists of a transmitter, called OU, and

    a receiver, called MU (Machine Unit). An OU is a controller with controls in the form of

    buttons, joysticks and switches and with indicators in the form of LEDs and display. To

    ensure that an OU only can communicate with a specific MU and vice versa the units’ radio

    modules must be paired together through a process called “learn link”, that is performed by

    connecting the units with a CAN-cable.

     

    By using an OU simulator for MU production tests it would be easier to perform some tests,

    such as internal errors and warnings, and it would be possible to include tests that are

    impossible to do with OU hardware, such as intentionally send a miscalculated checksum, to

    examine the MU’s response. The OU simulator should have a graphical user interface and by

    connecting a radio card to the PC it should be able to send and receive data from an MU. It

    should also be able to perform “learn link”. The final product was developed using C#

    together with an XP-inspired development method.

  • 1471.
    Rastoder, Alen
    Örebro University, School of Science and Technology.
    En läroboksanalys mellan Sverige och England: en kvantitativ studie om öppna och slutna problemuppgifter i matematik2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In PISA 2012 England ended in eleventh place and Sweden in twentieth place when it comes to problem solving in mathematics, OECD (2014). In both countries, teaching with textbook are mean thing. In this study, I have therefore examined the most widely used teaching material in each country. This survey was conducted by first ensuring all the problem solving tasks contained in mathematics books using the criteria from previous research. Then use the criteria to see if these problem tasks are open or closed problems. The results show that problem solving is treated to the same extent in both books but that English contains significantly more open problems tasks than the Swedish one.

  • 1472.
    Reed, Sean
    et al.
    Faculty of Engineering, The University of Nottingham, England.
    Löfstrand, Magnus
    Örebro University, School of Science and Technology.
    Logical Representation of Maintenance Procedures for Verification and Analysis2016Conference paper (Refereed)
  • 1473.
    Reggente, Matteo
    Örebro University, School of Science and Technology.
    Statistical gas distribution modelling for mobile robot applications2014Doctoral thesis, monograph (Other academic)
    Abstract [en]

    In this dissertation, we present and evaluate algorithms for statistical gas distribution modelling in mobile robot applications. We derive a representation of the gas distribution in natural environments using gas measurements collected with mobile robots. The algorithms fuse different sensors readings (gas, wind and location) to create 2D or 3D maps.

    Throughout this thesis, the Kernel DM+V algorithm plays a central role in modelling the gas distribution. The key idea is the spatial extrapolation of the gas measurement using a Gaussian kernel. The algorithm produces four maps: the weight map shows the density of the measurements; the confidence map shows areas in which the model is considered being trustful; the mean map represents the modelled gas distribution; the variance map represents the spatial structure of the variance of the mean estimate.

    The Kernel DM+V/W algorithm incorporates wind measurements in the computation of the models by modifying the shape of the Gaussian kernel according to the local wind direction and magnitude.

    The Kernel 3D-DM+V/W algorithm extends the previous algorithm to the third dimension using a tri-variate Gaussian kernel.

    Ground-truth evaluation is a critical issue for gas distribution modelling with mobile platforms. We propose two methods to evaluate gas distribution models. Firstly, we create a ground-truth gas distribution using a simulation environment, and we compare the models with this ground-truth gas distribution. Secondly, considering that a good model should explain the measurements and accurately predicts new ones, we evaluate the models according to their ability in inferring unseen gas concentrations.

    We evaluate the algorithms carrying out experiments in different environments. We start with a simulated environment and we end in urban applications, in which we integrated gas sensors on robots designed for urban hygiene. We found that typically the models that comprise wind information outperform the models that do not include the wind data.

  • 1474.
    Reggente, Matteo
    et al.
    Örebro University, School of Science and Technology.
    Lilienthal, Achim J.
    Örebro University, School of Science and Technology.
    Using local wind information for gas distribution mapping in outdoor environments with a mobile robot2009In: 2009 IEEE SENSORS, VOLS 1-3, NEW YORK: IEEE conference proceedings, 2009, p. 1715-1720Chapter in book (Other academic)
    Abstract [en]

    In this paper we introduce a statistical method to build two-dimensional gas distribution maps (Kernel DM+V/W algorithm). In addition to gas sensor measurements, the proposed method also takes into account wind information by modeling the information content of the gas sensor measurements as a bivariate Gaussian kernel whose shape depends on the measured wind vector. We evaluate the method based on real measurements in an outdoor environment obtained with a mobile robot that was equipped with gas sensors and an ultrasonic anemometer for wind measurements. As a measure of the model quality we compute how well unseen measurements are predicted in terms of the data likelihood. The initial results are encouraging and show a clear improvement of the proposed method compared to the case where wind is not considered.

  • 1475.
    Rehnberg, Annasara
    Örebro University, School of Science and Technology.
    Arbete i grupp under matematiklektioner: Lärares förhållningssätt till samarbetsinlärning2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Based upon an interest to learn about what it takes to make collaborative learning promote every students abilities this study focuses on four teachers beliefs about students working together in mathematics. Drawing upon theories that concludes that cooperative learning develops students’ mathematical skills. To broaden the view of the teachers’ opinion this study also reflects upon the differences and similarities between the theory that cooperative learning is beneficial, the results of earlier research studies and teachers beliefs. While the theory about students working together is positive about cooperative learning develops all students mathematical abilities, the teachers find it hard to see that one method can be constructive to all students especially because of the social circumstances’. The participating teachers points out that to make a social method work for everybody the social circumstances’ has to open up for dynamic where all students take responsibility and respect one another.

  • 1476.
    Reicher, Robin
    Örebro University, School of Science and Technology.
    Robot based 3D scanning and recognition of workpieces2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Quality inspection of a product is central of many manufacturing processes.

    While inspection on flat surfaces can be made fairly autonomous today, highly

    reflective free-form objects is problematic in many ways. This thesis is one part

    out of a two-part project investigating in an autonomous way to recognize,

    model, store relevant information and inspect these kind of work pieces. This

    part will focus on the recognition, modeling and database design. The system,

    established in this thesis will use a robotic manipulator, an industrial camera

    and the handheld 3-D scanner Exascanner. We present a methodology for

    preparing a work piece to be inspected autonomously and a simple implementation

    of the proposed methodology. The implementation recognizes workpieces

    with a support vector machine trained on histogram of oriented gradients features.

    These features are extracted from several pictures taken from different

    angles around the workpiece. The use of different angles are to make the classifier

    more versatile and robust to object being rotated or moved. If the workpeice

    is not recognized a spiral shaped dome path is created, scaled with the help of

    the pictures already taken. This shape helps ensuring a high quality scan of objects

    were there is no shape information to be used. The robotic manipulator is

    used to move the scanner along the path around the object, creating a surface

    profile of the object. This profile is built up of triangular facets of various size

    and needs to be processed before inspection of the surface can be made. A recursive

    splitting algorithm is used to make the facets as equilateral as possible

    and to make their size more suitable for the viewing range of the surface inspection

    camera. As a final step this information is stored in a database to be

    used later as support during inspection.

     

  • 1477.
    Remmer, Carl
    Örebro University, School of Science and Technology.
    Differences Between Swedish, French and American Oak when Storing Whisky Analysed by GC-MS2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study describes how to analyse 12 different volatile oak related compounds in whisky using a gas chromatograph (GC) coupled to a mass spectrometer (MS). This is done in a way that makes it possible to characterize the properties of Swedish oak in comparison to American and French oak. The different parameters that contribute to the variation in these compounds studied in this report are the origin of the oak wood, the size of the barrel, the time the whisky is stored and the toasting degree of the barrel. Different diagrams are made to visualize the differences in compound concentration the different treatments and maturation periods in-between. The results propose that differences between origins, toasting and barrel size could be made. But since the whiskies are still under maturation, no final taste profile could be made.

  • 1478.
    Renoux, Jennifer
    Örebro University, School of Science and Technology.
    Active Situation Reporting: Definition and Analysis2017Conference paper (Refereed)
  • 1479.
    Renoux, Jennifer
    et al.
    Örebro University, School of Science and Technology.
    Alirezaie, Marjan
    Örebro University, School of Science and Technology.
    Karlsson, Lars
    Örebro University, School of Science and Technology.
    Köckemann, Uwe
    Örebro University, School of Science and Technology.
    Pecora, Federico
    Örebro University, School of Science and Technology.
    Loutfi, Amy
    Örebro University, School of Science and Technology.
    Context Recognition in Multiple Occupants Situations: Detecting the Number of Agents in a Smart Home Environment with Simple Sensors2017In: Knowledge-based techniques for problem solving and reasoning(KnowProS 2017): A workshop at AAAI 2017, February 5, 2017, San Francisco, U.S.A., Palo Alto: AAAI Press, 2017, Vol. ws17, p. 758-764, article id WS-17-12Conference paper (Refereed)
    Abstract [en]

    Context-recognition and activity recognition systems in multi-user environments such as smart homes, usually assume to know the number of occupants in the environment. However, being able to count the number of users in the environment is important in order to accurately recognize the activities of (groups of) agents. For smart environments without cameras, the problem of counting the number of agents is non-trivial. This is in part due to the difficulty of using a single non-vision based sensors to discriminate between one or several persons, and thus information from several sensors must be combined in order to reason about the presence of several agents. In this paper we address the problem of counting the number of agents in a topologically known environment using simple sensors that can indicate anonymous human presence. To do so, we connect an ontology to a probabilistic model (a Hidden Markov Model) in order to estimate the number of agents in each section of the environment. We evaluate our methods on a smart home setup where a number of motion and pressure sensors are distributed in various rooms of the home.

  • 1480.
    Reyhanian Caspillo, Nasim
    et al.
    Örebro University, School of Science and Technology. Södertörn university.
    Porseryd, Tove
    Södertörn university.
    Volkova, Kristina
    Örebro University, School of Science and Technology. Södertörn university.
    Elabbas, Lubna
    Södertörn university.
    Källman, Thomas
    Uppsala university.
    Dinnétz, Patrik
    Södertörn university.
    Olsson, Per-Erik
    Örebro University, School of Science and Technology.
    Porsch Hällström, Inger
    Södertörn university.
    Testis transcriptome alterations in zebrafish (Danio rerio) with reduced fertility due to developmental exposure to 17α-ethinyl estradiolManuscript (preprint) (Other academic)
  • 1481.
    Riahi, Jemil
    Örebro University, School of Science and Technology.
    Castaway: Nätverksspel till Swedish Game Awards2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    It is described in this report how to develop a network that can be used in different network games. How to prevent clients that is cheating and try to achieve a secure network that regular clients to the game should not be affected too much from.

    In ten weeks a network is developed that represents the foundation of a network game. A very simple game with a network structure that prevents cheating.

  • 1482.
    RICAO CANELHAS, DANIEL
    Örebro University, School of Science and Technology.
    Scene Representation, Registration and ObjectDetection in a Truncated Signed Distance FunctionRepresentation of 3D Space2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis presents a study of the signed distance function as a three-dimensional

    implicit surface representation and provides a detailed overview of its

    different properties. A method for generating such a representation using the

    depth-image output from a Kinect camera is reviewed in detail. In order to improve

    the quality of the implicit function that can be obtained, registration of

    multiple sensor views is proposed and formulated as a camera pose-estimation

    problem.

    To solve this problem, we first propose to minimize an objective function,

    based on the signed distance function itself. We then linearise this objective

    and reformulate the pose-estimation problem as a sequence of convex optimization

    problems. This allows us to combine multiple depth measurements

    into a single distance function and perform tracking using the resulting surface

    representation.

    Having these components well defined and implemented in a multi-threaded

    fashion, we tackle the problem of object detection. This is done by applying the

    same pose-estimation procedure to a 3D object template, at several locations,

    in an environment reconstructed using the aforementioned surface representation.

    We then present results for localization, mapping and object detection.

    Experiments on a well-known benchmark indicate that our method for localization

    performs very well, and is comparable both in terms of speed and

    error to similar algorithms that are widely used today. The quality of our surface

    reconstruction is close to the state of the art. Furthermore, we show an

    experimental set-up, in which the location of a known object is successfully

    determined within an environment, by means of registration.

    i

  • 1483.
    Riddell, Nicole
    Örebro University, School of Science and Technology.
    Packed Column Supercritical Fluid Chromatography: Applications in Environmental Chemistry2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Although gas and liquid chromatography have emerged as dominant separation techniques in environmental analytical chemistry, these methods do not allow for the concurrent analysis of chemically diverse groups of persistent organic pollutants (POPs). There are also a small number of compounds which are not easily amenable to either of these traditional separation techniques. The main objective of this thesis was to address these issues by demonstrating the applicability of packed column supercritical fluid chromatography (pSFC) coupled to mass spectrometry (MS) in various aspects of environmental chemistry.

    First, pSFC/MS analytical methods were developed for legacy POPs (PCDDs, PCDFs, and PCBs) as well as the emerging environmental contaminant Dechlorane Plus (DP), and issues relating to the ionization of target analytes when pSFC was coupled to MS were explored. Novel APPI and APCI reagents (fluorobenzene and triethylamine) were optimized and real samples (water and soil) were analyzed to demonstrate environmental applicability.

    The possibility of chiral and preparative scale pSFC separations was then demonstrated through the isolation and characterization of thermally labile hexabromocyclododecane (HBCDD) stereoisomers. The analytical pSFC separation of the α-, β-, and γ-HBCDD enantiomers as well as the δ and ε meso forms was shown to be superior to results obtained using a published LC method.

    Finally, technical mixtures of phosphorus flame retardants (RBDPP, BPA-BDPP, and DOPO; a group of related compounds which are challenging to analyze concurrently) were examined using multiple analytical techniques and pSFC was found to be the only method which facilitated the accurate determination of the components of all 3 mixtures. This thesis confirms the potential of pSFC/MS as a fast, green, and cost effective means of separating and analyzing environmental contaminants.

    List of papers
    1. Comparative assessment of the chromatographic separation of 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans using supercritical fluid chromatography and high resolution gas chromatography
    Open this publication in new window or tab >>Comparative assessment of the chromatographic separation of 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans using supercritical fluid chromatography and high resolution gas chromatography
    Show others...
    2015 (English)In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 7, no 21, p. 9245-9253Article in journal (Refereed) Published
    Abstract [en]

    The analysis of legacy environmental contaminants, such as polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), using high resolution gas chromatography (HRGC) is well established and universally accepted. The use of an alternative separation technique, such as packed column supercritical fluid chromatography (pSFC), may be of interest as a fast, green, and cost effective method of analyzing environmental samples. The technique is amenable to a broad range of chemical compounds and could facilitate the simultaneous analysis of multiple compound classes as well as the inclusion of thermally labile compounds in a single targeted analysis. The recent re-emergence of this technology due to the introduction of more robust and efficient instrumentation may result in an increased acceptance of pSFC analytical techniques in this area. Herein, the first reported analytical separation of PCDDs and PCDFs by pSFC is described and its separation capabilities are compared with established HRGC protocols. Elution profiles of 2,3,7,8-substituted PCDDs and PCDFs were examined and the separation of PCDD/PCDF homologue groups was found to be comparable to those accomplished using HRGC. Similarly, the resolution of tetrachlorodibenzo-p-dioxin (TCDD) congeners, as required by current regulatory methods utilizing HRGC, was demonstrated and the separation of possible co-eluting PCDD/PCDF congeners was examined and compared to that achieved using popular HRGC capillary columns. The possibility of concurrent analysis of toxic polychlorinated biphenyls (PCBs) with PCDDs and PCDFs using the developed pSFC method was also investigated. The effective separation of these environmental contaminants obtained using pSFC and subsequent detection utilizing atmospheric pressure photoionization tandem mass spectrometry at environmentally relevant levels demonstrates the promise associated with this technique for the analysis of environmental extracts.

    Place, publisher, year, edition, pages
    Royal Society of Chemistry, 2015
    National Category
    Chemical Sciences Food Science
    Research subject
    Chemistry
    Identifiers
    urn:nbn:se:oru:diva-46699 (URN)10.1039/c5ay01644d (DOI)000363732900034 ()2-s2.0-84945421701 (Scopus ID)
    Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2017-10-18Bibliographically approved
    2. Coupling Supercritical Fluid Chromatography to Positive Ion Atmospheric Pressure Ionization Mass Spectrometry: Ionization Optimization of Halogenated Environmental Contaminants
    Open this publication in new window or tab >>Coupling Supercritical Fluid Chromatography to Positive Ion Atmospheric Pressure Ionization Mass Spectrometry: Ionization Optimization of Halogenated Environmental Contaminants
    Show others...
    (English)Manuscript (preprint) (Other academic)
    National Category
    Other Chemistry Topics
    Identifiers
    urn:nbn:se:oru:diva-57150 (URN)
    Available from: 2017-04-21 Created: 2017-04-21 Last updated: 2017-10-18Bibliographically approved
    3. Coupling of Supercritical Fluid Chromatography to Mass Spectrometry for the Analysis of Dechlorane Plus: Examination of Relevant Negative Ion Atmospheric Pressure Chemical Ionization Mechanisms
    Open this publication in new window or tab >>Coupling of Supercritical Fluid Chromatography to Mass Spectrometry for the Analysis of Dechlorane Plus: Examination of Relevant Negative Ion Atmospheric Pressure Chemical Ionization Mechanisms
    Show others...
    (English)Manuscript (preprint) (Other academic)
    National Category
    Other Chemistry Topics
    Identifiers
    urn:nbn:se:oru:diva-57152 (URN)
    Available from: 2017-04-21 Created: 2017-04-21 Last updated: 2017-10-18Bibliographically approved
    4. Enantioselective Analytical- and Preparative-Scale Separation of Hexabromocyclododecane Stereoisomers Using Packed Column Supercritical Fluid Chromatography
    Open this publication in new window or tab >>Enantioselective Analytical- and Preparative-Scale Separation of Hexabromocyclododecane Stereoisomers Using Packed Column Supercritical Fluid Chromatography
    Show others...
    2016 (English)In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 21, no 11, article id 1509Article in journal (Refereed) Published
    Abstract [en]

    Hexabromocyclododecane (HBCDD) is an additive brominated flame retardant which has been listed in Annex A of the Stockholm Convention for elimination of production and use. It has been reported to persist in the environment and has the potential for enantiomer-specific degradation, accumulation, or both, making enantioselective analyses increasingly important. The six main stereoisomers of technical HBCDD (i.e., the (+) and (-) enantiomers of α-, β-, and γ-HBCDD) were separated and isolated for the first time using enantioselective packed column supercritical fluid chromatography (pSFC) separation methods on a preparative scale. Characterization was completed using published chiral liquid chromatography (LC) methods and elution profiles, as well as X-ray crystallography, and the isolated fractions were definitively identified. Additionally, the resolution of the enantiomers, along with two minor components of the technical product (δ- and ε-HBCDD), was investigated on an analytical scale using both LC and pSFC separation techniques, and changes in elution order were highlighted. Baseline separation of all HBCDD enantiomers was achieved by pSFC on an analytical scale using a cellulose-based column. The described method emphasizes the potential associated with pSFC as a green method of isolating and analyzing environmental contaminants of concern.

    Place, publisher, year, edition, pages
    Basel, Switzerland: MDPI AG, 2016
    Keyword
    hexabromocyclododecane, enantiomeric separation, supercritical fluid chromatography
    National Category
    Analytical Chemistry
    Identifiers
    urn:nbn:se:oru:diva-53487 (URN)10.3390/molecules21111509 (DOI)000389918200091 ()27834934 (PubMedID)2-s2.0-84997428723 (Scopus ID)
    Available from: 2016-11-15 Created: 2016-11-14 Last updated: 2017-11-29Bibliographically approved
    5. Examination of technical mixtures of halogen-free phosphorus based flame retardants using multiple analytical techniques
    Open this publication in new window or tab >>Examination of technical mixtures of halogen-free phosphorus based flame retardants using multiple analytical techniques
    Show others...
    2017 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 176, no June 2017, p. 333-341Article in journal (Refereed) Published
    Abstract [en]

    The application of phosphorus based flame retardants as replacements for commonly used halogenated flame retardants has been gaining interest due to the possibility that these compounds may have a less significant impact on human and environmental health. Unfortunately, little is known about the chemical compositions of many of the technical products (which often are mixtures) and a single separation technique for concurrent analysis of these types of compounds has not been identified. This paper reports the results of an investigation into the constituents of three halogen free organophosphate flame retardants (OPFRs), resorcinol bis(diphenyl phosphate) (RDBPP), bisphenol A bis(diphenyl phosphate) (BPA-BDPP), and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The major components of commercial samples of RDBPP and BPA-BDPP were isolated by preparative TLC and characterized by NMR. A commercial sample of DOPO was found to be essentially pure, but its analysis is complicated by the fact that it can exist in ring-open and ring-closed forms. With the structures of the components confirmed by NMR, multiple analytical separation techniques (gas chromatography (GC), liquid chromatography (LC), and packed column supercritical fluid chromatography (pSFC)) were investigated for the analysis of these three technical products. Packed column supercritical fluid chromatography allows the separation of the components of all three OPFRs, including the two forms of DOPO, in a single run.

    Place, publisher, year, edition, pages
    Elsevier, 2017
    Keyword
    Organophosphate flame retardants (OPFRs); pSFC/MS method; NMR; RDBPP; BPA-BDPP; DOPO
    National Category
    Other Chemistry Topics Environmental Sciences
    Identifiers
    urn:nbn:se:oru:diva-57461 (URN)10.1016/j.chemosphere.2017.02.129 (DOI)000399849300038 ()28282639 (PubMedID)2-s2.0-85015851681 (Scopus ID)
    Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2017-09-11Bibliographically approved
  • 1484.
    Riddell, Nicole
    et al.
    Örebro University, School of Science and Technology. Wellington Laboratories Inc., Guelph, Canada.
    Mullin, Lauren Gayle
    Örebro University, School of Science and Technology. Waters Corporation, Milford, USA.
    van Bavel, Bert
    Örebro University, School of Science and Technology. Norwegian Institute for Water Research, Oslo, Norway.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology.
    McAlees, Alan
    Wellington Laboratories Inc., Guelph, Canada.
    Brazeau, Allison
    Wellington Laboratories Inc., Guelph, Canada.
    Synnott, Scott
    Wellington Laboratories Inc., Guelph, Canada.
    Lough, Alan
    Department of Chemistry, University of Toronto, Toronto, Canada.
    McCrindle, Robert
    Wellington Laboratories Inc., Guelph, Canada; Chemistry Department, University of Guelph, Guelph, Canada.
    Chittim, Brock
    Wellington Laboratories Inc., Guelph, Canada.
    Enantioselective Analytical- and Preparative-Scale Separation of Hexabromocyclododecane Stereoisomers Using Packed Column Supercritical Fluid Chromatography2016In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 21, no 11, article id 1509Article in journal (Refereed)
    Abstract [en]

    Hexabromocyclododecane (HBCDD) is an additive brominated flame retardant which has been listed in Annex A of the Stockholm Convention for elimination of production and use. It has been reported to persist in the environment and has the potential for enantiomer-specific degradation, accumulation, or both, making enantioselective analyses increasingly important. The six main stereoisomers of technical HBCDD (i.e., the (+) and (-) enantiomers of α-, β-, and γ-HBCDD) were separated and isolated for the first time using enantioselective packed column supercritical fluid chromatography (pSFC) separation methods on a preparative scale. Characterization was completed using published chiral liquid chromatography (LC) methods and elution profiles, as well as X-ray crystallography, and the isolated fractions were definitively identified. Additionally, the resolution of the enantiomers, along with two minor components of the technical product (δ- and ε-HBCDD), was investigated on an analytical scale using both LC and pSFC separation techniques, and changes in elution order were highlighted. Baseline separation of all HBCDD enantiomers was achieved by pSFC on an analytical scale using a cellulose-based column. The described method emphasizes the potential associated with pSFC as a green method of isolating and analyzing environmental contaminants of concern.

  • 1485.
    Riddell, Nicole
    et al.
    Örebro University, School of Science and Technology.
    van Bavel, Bert
    Örebro University, School of Science and Technology.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology.
    McCrindle, R.
    McAlees, A.
    Chittim, B.
    Negative Ion APCI Mechanisms Associated with the Coupling of Supercritical Fluid Chromatography to Mass Spectrometry for the Analysis of Halogenated Environmental Contaminants2016In: Organohalogen Compounds, ISSN 1026-4892, Vol. 78Article in journal (Refereed)
  • 1486.
    Riddell, Nicole
    et al.
    Örebro University, School of Science and Technology. Wellington Laboratories Inc., Guelph Ontario, Canada.
    van Bavel, Bert
    Örebro University, School of Science and Technology. Norwegian Institute for Water Research, Oslo, Norway.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology.
    McCrindle, Robert
    Chemistry Department, University of Guelph, Guelph ON, Canada.
    McAlees, Alan
    Wellington Laboratories Inc., Guelph Ontario, Canada.
    Chittim, Brock
    Wellington Laboratories Inc., Guelph Ontario, Canada.
    Coupling of supercritical fluid chromatography to mass spectrometry for the analysis of Dechlorane Plus: Examination of relevant negative ion atmospheric pressure chemical ionization mechanisms2017In: Talanta: The International Journal of Pure and Applied Analytical Chemistry, ISSN 0039-9140, E-ISSN 1873-3573, Vol. 171, p. 68-73Article in journal (Refereed)
    Abstract [en]

    During an investigation of the potential associated with coupling packed column supercritical fluid chromatography (pSFC) to mass spectrometry for the analysis of Dechlorane Plus and related compounds, it was found that negative ion atmospheric pressure chemical ionization (APCI) was a promising ionization technique. In the course of maximizing the responses associated with the target analytes, it proved useful to examine some aspects of the complex nature and reactivity of the corona discharge plasma generated to explain the observed ionization products. Various dopants/reagents were screened for both APCI and atmospheric pressure photoionization (APPI) in negative ion mode and mechanisms of ionization involving superoxide were elucidated based on the results obtained. Superoxide formation was found to be temperature dependent and directly related to the intensity of the ion cluster [M-Cl+O](-) obtained for the target DP analytes. Furthermore, triethylamine was identified as a reagent capable of suppressing unwanted side reactions during the ionization process and maximizing response associated with the analytes of interest. The applicability of pSFC-APCI/MS for the separation and detection of Dechlorane Plus and related compounds was demonstrated by analyzing Lake Ontario sediment and comparing the results with values reported in the scientific literature.

  • 1487.
    Riddell, Nicole
    et al.
    Örebro University, School of Science and Technology. Wellington Laboratories Inc., Guelph, Ontario, Canada.
    van Bavel, Bert
    Örebro University, School of Science and Technology. Norwegian Institute for Water Research, Oslo, Norway.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology.
    McCrindle, Robert
    Chemistry Department, University of Guelph, Guelph, ON, Canada.
    McAlees, Alan
    Wellington Laboratories Inc., Guelph, Ontario, Canada.
    Chittim, Brock
    Wellington Laboratories Inc., Guelph, Ontario, Canada.
    Coupling of Supercritical Fluid Chromatography to Mass Spectrometry for the Analysis of Dechlorane Plus: Examination of Relevant Negative Ion Atmospheric Pressure Chemical Ionization MechanismsManuscript (preprint) (Other academic)
  • 1488.
    Riddell, Nicole
    et al.
    Wellington Laboratories Inc., Ontario, Canada; Man-Technology-Environment (MTM) Research Center, Örebro University, Örebro, Sweden.
    van Bavel, Bert
    Örebro University, School of Science and Technology. Norwegian Institute for Water Research, Oslo, Norway.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology.
    McCrindle, Robert
    Chemistry Department, University of Guelph, Guelph, Canada.
    McAlees, Alan
    Wellington Laboratories Inc., Guelph, Ontario, Canada.
    Chittim, Brock
    Wellington Laboratories Inc., Guelph, Ontario, Canada.
    Coupling supercritical fluid chromatography to positive ion atmospheric pressure ionization mass spectrometry: Ionization optimization of halogenated environmental contaminants2017In: International Journal of Mass Spectrometry, ISSN 1387-3806, E-ISSN 1873-2798, Vol. 421, p. 156-163Article in journal (Refereed)
    Abstract [en]

    Currently used analytical techniques for halogenated aromatic environmental contaminants such as polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls (PCBs), also known as legacy persistent organic pollutants, are based on gas chromatographic separation of target analytes and detection by mass spectrometry. The coupling of packed column supercritical fluid chromatography (SFC) to atmospheric pressure ionization mass spectrometry (API/MS) could allow for the concurrent analysis of thermally labile and legacy halogenated environmental contaminants if ionization can be sufficiently optimized. The evaluation of positive ion atmospheric pressure chemical ionization (APCI) and atmospheric pressure photoionization (APPI) as well as possible charge transfer dopants for the generation of molecular ion isotopomeric clusters of halogenated environmental contaminants with minimal fragmentation has been completed. Using the investigated parameters, positive ion APPI was found to be the more sensitive technique. Of the aromatic and cycloalkane dopants investigated, only fluorobenzene and trifluorotoluene were found to be effective dopants for the halogenated aromatic target analytes (PCDDs, PCDFs, and PCBs). Experiments involving deuterated dopants confirmed that reactive species generated by cycloalkanes were quenched by the SFC eluent rendering them unusable in conjunction with the investigated separation technique. Alternatively, aromatic dopants were found to be less susceptible to quenching by the SFC eluent and fluorobenzene was determined to be the most effective charge transfer dopant for PCDDs, PCDFs, and PCBs. To demonstrate the applicability of the optimized ionization conditions, SFC-API/MS has been used for the concurrent analysis of legacy halogenated aromatic environmental contaminants (PCDDs, PCDFs, and PCBs) and thermally labile analytes (alpha, beta, and gamma isomers of hexabromocyclododecane).

  • 1489.
    Riddell, Nicole
    et al.
    Örebro University, School of Science and Technology. Wellington Laboratories Inc., Guelph, Ontario, Canada.
    van Bavel, Bert
    Örebro University, School of Science and Technology. Norwegian Institute for Water Research, Oslo, Norway.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology.
    McCrindle, Robert
    Chemistry Department, University of Guelph, Guelph, ON, Canada.
    McAlees, Alan
    Wellington Laboratories Inc., Guelph, Ontario, Canada.
    Chittim, Brock
    Wellington Laboratories Inc., Guelph, Ontario, Canada.
    Coupling Supercritical Fluid Chromatography to Positive Ion Atmospheric Pressure Ionization Mass Spectrometry: Ionization Optimization of Halogenated Environmental ContaminantsManuscript (preprint) (Other academic)
  • 1490.
    Riddell, Nicole
    et al.
    Örebro University, School of Science and Technology. Wellington Laboratories Inc., Guelph ON, Canada.
    van Bavel, Bert
    Örebro University, School of Science and Technology. Norwegian Institute for Water Research, Oslo, Norway.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology.
    McCrindle, Robert
    Wellington Laboratories Inc., Guelph ON, Canada; Chemistry Department, University of Guelph, Guelph ON, Canada.
    McAlees, Alan
    Wellington Laboratories Inc., Guelph ON, Canada.
    Chittim, Brock
    Wellington Laboratories Inc., Guelph ON, Canada.
    Examination of technical mixtures of halogen-free phosphorus based flame retardants using multiple analytical techniques2017In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 176, no June 2017, p. 333-341Article in journal (Refereed)
    Abstract [en]

    The application of phosphorus based flame retardants as replacements for commonly used halogenated flame retardants has been gaining interest due to the possibility that these compounds may have a less significant impact on human and environmental health. Unfortunately, little is known about the chemical compositions of many of the technical products (which often are mixtures) and a single separation technique for concurrent analysis of these types of compounds has not been identified. This paper reports the results of an investigation into the constituents of three halogen free organophosphate flame retardants (OPFRs), resorcinol bis(diphenyl phosphate) (RDBPP), bisphenol A bis(diphenyl phosphate) (BPA-BDPP), and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The major components of commercial samples of RDBPP and BPA-BDPP were isolated by preparative TLC and characterized by NMR. A commercial sample of DOPO was found to be essentially pure, but its analysis is complicated by the fact that it can exist in ring-open and ring-closed forms. With the structures of the components confirmed by NMR, multiple analytical separation techniques (gas chromatography (GC), liquid chromatography (LC), and packed column supercritical fluid chromatography (pSFC)) were investigated for the analysis of these three technical products. Packed column supercritical fluid chromatography allows the separation of the components of all three OPFRs, including the two forms of DOPO, in a single run.

  • 1491.
    Riddell, Nicole
    et al.
    Örebro University, School of Science and Technology. Wellington Laboratories Inc., Guelph, Canada.
    van Bavel, Bert
    Örebro University, School of Science and Technology.
    Jogsten, Ingrid Ericson
    Örebro University, School of Science and Technology.
    McCrindle, Robert
    Chemistry Department, University of Guelph, Guelph, ON, Canada.
    McAlees, Alan
    Wellington Laboratories Inc., Guelph, Canada.
    Potter, Dave
    Wellington Laboratories Inc., Guelph, Canada.
    Tashiro, Colleen
    Wellington Laboratories Inc., Guelph, Canada.
    Chittim, Brock
    Wellington Laboratories Inc., Guelph, Canada.
    Comparative assessment of the chromatographic separation of 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans using supercritical fluid chromatography and high resolution gas chromatography2015In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 7, no 21, p. 9245-9253Article in journal (Refereed)
    Abstract [en]

    The analysis of legacy environmental contaminants, such as polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), using high resolution gas chromatography (HRGC) is well established and universally accepted. The use of an alternative separation technique, such as packed column supercritical fluid chromatography (pSFC), may be of interest as a fast, green, and cost effective method of analyzing environmental samples. The technique is amenable to a broad range of chemical compounds and could facilitate the simultaneous analysis of multiple compound classes as well as the inclusion of thermally labile compounds in a single targeted analysis. The recent re-emergence of this technology due to the introduction of more robust and efficient instrumentation may result in an increased acceptance of pSFC analytical techniques in this area. Herein, the first reported analytical separation of PCDDs and PCDFs by pSFC is described and its separation capabilities are compared with established HRGC protocols. Elution profiles of 2,3,7,8-substituted PCDDs and PCDFs were examined and the separation of PCDD/PCDF homologue groups was found to be comparable to those accomplished using HRGC. Similarly, the resolution of tetrachlorodibenzo-p-dioxin (TCDD) congeners, as required by current regulatory methods utilizing HRGC, was demonstrated and the separation of possible co-eluting PCDD/PCDF congeners was examined and compared to that achieved using popular HRGC capillary columns. The possibility of concurrent analysis of toxic polychlorinated biphenyls (PCBs) with PCDDs and PCDFs using the developed pSFC method was also investigated. The effective separation of these environmental contaminants obtained using pSFC and subsequent detection utilizing atmospheric pressure photoionization tandem mass spectrometry at environmentally relevant levels demonstrates the promise associated with this technique for the analysis of environmental extracts.

  • 1492.
    Ristinmaa, Matti
    et al.
    Division of Solid Mechanics, Lund University, Lund, Sweden.
    Saabye Ottosen, Niels
    Division of Solid Mechanics, Lund University, Lund, Sweden.
    Korin, Christer
    Örebro University, School of Science and Technology.
    Analytical Prediction of Package Collapse Loads: Basic considerations2012In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 4, p. 806-813Article in journal (Refereed)
    Abstract [en]

    Calculation of Box Compression Resistance (BCR) is a challenging task and here the possibility of an engineering approach is considered. The strive has been towards obtaining a simple and general predictive tool with as few parameters as possible and still obtaining an accurate estimate of the BCR. The model proposed is based on the concept of dividing the package into panels and corner panels. With these remarkably few structural elements it is possible to obtain simple explicit formulas where the only material parameters are given by standard tests in terms of short span compression test and bending resistance. The BCR for different packages is then obtained by a simply summation of the load from the panels and corner panels. A validation against experimental data indicates that, despite its remarkably simplicity, the predictions are very accurate for a wide range of package types, package dimensions, board qualities and loading directions.

  • 1493.
    Rituerto, Alejandro
    et al.
    Instituto de Investigación en Ingeniería de Aragón, Deptartmento de Informática e Ingeniería de Sistemas, University of Zaragoza, Zaragoza, Spain.
    Andreasson, Henrik
    Örebro University, School of Science and Technology.
    Murillo, Ana C.
    Instituto de Investigación en Ingeniería de Aragón, Deptartmento de Informática e Ingeniería de Sistemas, University of Zaragoza, Zaragoza, Spain.
    Lilienthal, Achim
    Örebro University, School of Science and Technology.
    Jesus Guerrero, Jose
    Instituto de Investigación en Ingeniería de Aragón, Deptartmento de Informática e Ingeniería de Sistemas, University of Zaragoza, Zaragoza, Spain.
    Building an Enhanced Vocabulary of the Robot Environment with a Ceiling Pointing Camera2016In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 16, no 4, article id 493Article in journal (Refereed)
    Abstract [en]

    Mobile robots are of great help for automatic monitoring tasks in different environments. One of the first tasks that needs to be addressed when creating these kinds of robotic systems is modeling the robot environment. This work proposes a pipeline to build an enhanced visual model of a robot environment indoors. Vision based recognition approaches frequently use quantized feature spaces, commonly known as Bag of Words (BoW) or vocabulary representations. A drawback using standard BoW approaches is that semantic information is not considered as a criteria to create the visual words. To solve this challenging task, this paper studies how to leverage the standard vocabulary construction process to obtain a more meaningful visual vocabulary of the robot work environment using image sequences. We take advantage of spatio-temporal constraints and prior knowledge about the position of the camera. The key contribution of our work is the definition of a new pipeline to create a model of the environment. This pipeline incorporates (1) tracking information to the process of vocabulary construction and (2) geometric cues to the appearance descriptors. Motivated by long term robotic applications, such as the aforementioned monitoring tasks, we focus on a configuration where the robot camera points to the ceiling, which captures more stable regions of the environment. The experimental validation shows how our vocabulary models the environment in more detail than standard vocabulary approaches, without loss of recognition performance. We show different robotic tasks that could benefit of the use of our visual vocabulary approach, such as place recognition or object discovery. For this validation, we use our publicly available data-set.

  • 1494.
    Rivas Diaz, Juan Manuel
    Örebro University, School of Science and Technology.
    Model-based object tracking with an infrared stereo camera2015Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Object tracking has become really important in the field of robotics in the last

    years. Frequently, the goal is to obtain the trajectory of the tracked target over

    time and space by acquiring and processing information from the sensors.

    In this thesis we are interested in tracking objects at a very short range. The

    primary application of our approach is targeting the domain of object tracking

    during grasp execution with a hand-in-eye sensor setup. To this end, a

    promising approach investigated in this work is based on the Leap Motion

    sensor, which is designed for tracking human hands. However, we are

    interested in tracking grasped objects thus we need to extend its functionality.

    The main goal of the thesis is to track the 3D position and orientation of an

    object from a set of simple primitives (cubes, cylinders, triangles) over a video

    sequence. That is the reason we have designed and developed two different

    approaches for tracking objects with the Leap Motion device as stereo vision

    system.

  • 1495.
    Rockel, Sebastian
    et al.
    University of Hamburg, Germany.
    Konečný, Štefan
    Örebro University, School of Science and Technology.
    Stock, Sebastian
    Osnabrück University, Germany; DFKI Robotics Innovation Center, Osnabrück Branch, Germany.
    Hertzberg, Joachim
    Osnabrück University, Germany; DFKI Robotics Innovation Center, Osnabrück Branch, Germany.
    Pecora, Federico
    Örebro University, School of Science and Technology.
    Zhang, Jianwei
    University of Hamburg, Germany.
    Integrating physics-based prediction with semantic plan execution monitoring2015In: 2015 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS (IROS), IEEE , 2015, p. 2883-2888Conference paper (Refereed)
    Abstract [en]

    Real-world robotic systems have to deal with uncertain and dynamic environments to reliably perform tasks. State-of-the-art cognitive robotic systems use an abstract symbolic representation of the real world that is used for high level reasoning. Some aspects of the world, such as object dynamics, are inherently difficult to capture in an abstract symbolic form, yet they influence whether the executed action will succeed or fail. This paper presents an integrated system that uses a physics-based simulation for predicting robot action results and durations, combined with a Hierarchical Task Network (HTN) planner and semantic execution monitoring. We describe a fully integrated system performing functional imagination, which is essentially contributed by a Semantic Execution Monitor (SEM). Based on information obtained from functional imagination, the robot control decides whether it is necessary to adapt the plan that is currently being executed. As a proof of concept, we demonstrate PR2 able of carrying objects on a tray without the objects toppling. Our approach achieves this by considering the robot and object dynamics in simulation. A validation shows that robot action results in simulation can be transferred to the real world. The system improves on state-of-the-art AI plan-based systems by feeding simulated prediction results back into the execution system.

  • 1496.
    Rodesten, Stephan
    Örebro University, School of Science and Technology.
    Program för frekvensanalys2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report will cover the work process behind creating a spectrum analyzer. The reader will be able to read about the chosen method but also the alternative methods. Apart from this the theoretical parts behind every moment will also be covered and compared to potential alternative solutions.

    The project has been carried out on behalf of KA Automation. The purpose of the project was to create a base for analyzing sound frequencies. The goal was to be able to identify sound properties in the form of frequencies in servo motors in for example water pumps. The idea was to be able to in a later development stage be able to identify when new frequencies have entered the audio profile which might result in the motor to be in need of service. The base is created with the help of C# and the sound library NAudio.

    From the result one can conclude that this program can analyze sound and display the magnitude of its frequency components and is therefore a suitable base for future development.

  • 1497.
    Rolf, Matilda
    et al.
    Örebro University, School of Science and Technology.
    Källberg, Maja
    Örebro University, School of Science and Technology.
    Effektivisering av fönstermontage hos AB Strängbetong2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study is a case study at the company AB Strängbetong. The company manufactures wall elements in prefabricated concrete. Today, the company has a problem with its window assembly. Forecasts show that the company expects a volume increase on the option of assemble windows. The purpose of this study is to provide a complete survey of Strängbetong's window assembly, suggestions for solutions for an efficient working method and possibly develop a standardized approach. The process needs to be streamlined to cope with this. This study is based on a number of different theories. Among other things Lean, with focusing on eliminating waste in the process.

    Following a survey of the window assembly department, solutions are presented that will help to reduce waste in the process. Two solutions are presented, of which Solution 1 can be done without the need to use economic resources. Solution 2 is presented as a longer term solution and requires the company to invest in new areas and tools. The two suggested solution are expected to reduce wastes, which means that Strängbetong's window assembly process becomes more efficient and is considered ready for future volume increases.

  • 1498.
    Romin, Alexander
    et al.
    Örebro University, School of Science and Technology.
    Karlsson, Anton
    Örebro University, School of Science and Technology.
    Grip stiffness analysis of carton board packages2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is a part of the research project "A New Model for Deformation of Carton Board Packages by Manual Handling". This project is a collaboration between Örebro University and two companies engaged in carton board packages. This report describes whether Syntouch's BioTac is an appropriate tool, compared with a consumer study when investigating the grip stiffness of consumer packaging. Syntouch's BioTac is an artificial sensor designed to imitate the force of a human fingertip. The concept of grip stiffness is used in the packaging industry to describe the packaging’s properties to withstand clamping pressure when handling by the user. That is, the robustness of the packaging. The carton board packaging should perceive as stiff, firm to grip and not deform during handling. The purpose is to perform laboratory tests with the BioTac sensor, to see if the sensor can be used as a measurement method for grip stiffness of card board materials.

  • 1499.
    Roos, Vendela
    et al.
    Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden.
    Rönn, Monika
    Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden.
    Salihovic, Samira
    Örebro University, School of Science and Technology.
    Lind, Lars
    Department of Medicine, Uppsala University, Uppsala, Sweden.
    van Bavel, Bert
    Örebro University, School of Science and Technology.
    Kullberg, Joel
    Department of Oncology, Radiology and Clinical Immunology, Uppsala University, Uppsala, Sweden.
    Johansson, Lars
    Uppsala Univ, Dept Oncol Radiol & Clin Immunol, Uppsala, Sweden.Department of Oncology, Radiology and Clinical Immunology, Uppsala University, Uppsala, Sweden.
    Ahlström, Håkan
    Department of Oncology, Radiology and Clinical Immunology, Uppsala University, Uppsala, Sweden.
    Lind, P. Monica
    Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden.
    Circulating Levels of Persistent Organic Pollutants in Relation to Visceral and Subcutaneous Adipose Tissue by Abdominal MRI2013In: Obesity, ISSN 1930-7381, E-ISSN 1930-739X, Vol. 21, no 2, p. 413-418Article in journal (Refereed)
    Abstract [en]

    Objective: We and others have shown relationships between circulating levels of persistent organic pollutants (POPs) and different measures of obesity in both cross-sectional and prospective studies. Since viscerally located fat seems to be the most harmful type, we investigated whether plasma POP levels were more closely related to visceral adipose tissue (VAT) than to subcutaneous adipose tissue (SAT).

    Design and Methods: Thousand hundred and sixteen subjects aged 70 years were investigated in the Prospective Investigation of the Vasculature in Uppsala Seniors (PIVUS) study; 23 POPs were analyzed using high-resolution gas chromatography/ high-resolution mass spectrometry. Abdominal magnetic resonance imaging, measuring VAT and SAT, respectively, was performed in a representative subsample of 287 subjects.

    Results: The less chlorinated polychlorinated biphenyl (PCB) congeners (105 and 118), and the pesticides dichlorodiphenyldichloroethylene (DDE), hexachlorobenzene (HCB), and trans-nonachlordane (TNC) were positively related to both VAT and SAT, whereas the more highly chlorinated PCBs (153, 156, 157, 169, 170, 180, 194, 206, and 209) were inversely related to both VAT and SAT. PCB189 was related to the VAT/SAT ratio in an inverted U-shaped manner (P = 0.0008).

    Conclusions: In conclusion, the results were in accordance with our previous studies using waist circumference and fat mass as obesity measure. However, the novel finding that PCB189 was related to the VAT/SAT ratio deserves further investigation since exposure to this PCB congener, which has previously been linked to diabetes development, might thereby play a role in the distribution of abdominal adipose tissue.

  • 1500.
    Rosell, Andreas
    et al.
    Örebro University, School of Science and Technology.
    Salomonsson, Ludvig
    Örebro University, School of Science and Technology.
    Analys av kvalitetsbristkostnader: En studie som belyser konsekvenserna av bristande kvalitet2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The harsh competition the producing organizations face these days, sets high expectations concerning effectivity, profitability and process development. To improve the organization is an essential part for survival. In order to successfully improve your organization you should first identify what process that’s in dire need. This can be achieved by identifying, analyzing and eliminating the wastes inside the company. This report sets the foundation for future improvements by identifying the locations, reasons and economic consequences of waste. A case study whose purpose was to analyze an activity which didn’t add value for the customer was performed to reveal additional areas of improvement. Through interviews, observations and studies of documented data, a new model for the registration system was created. These methods were also used to create an updated version of their internal price list. A case study were performed where two batches of meat, from different suppliers, were followed through processing. The purpose were to examine whether there is a link between supplier quality and increment of cost. Parameter such as time spent in stock, resource consumption and loss of weight where observed. The model combined with the price list can be used as a basis for future decisions regarding improvements. The case study demonstrates the consequences associated with a functional oriented business approach.

27282930313233 1451 - 1500 of 1890
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