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  • 651.
    Andersson, Jan-Erik
    et al.
    Förädling och processer (TRf).
    Persson, Fredrik
    Förädling och processer (TRf).
    Kondenspanel och mittinblås för jämnare torkresultat2016Report (Refereed)
  • 652.
    Andersson, Jan-Erik
    et al.
    Förädling och processer (TRf).
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Torkhus energijämförelse i praktiken – Sävar2016Report (Refereed)
  • 653.
    Andersson, Jan-Erik
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Förädling och processer (TRf).
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Lycken, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Olsson, Marcus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Wamming, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Sammanställning av energimätningar från EESI fas 12011Report (Refereed)
  • 654.
    Andersson, Jens A.
    et al.
    Lund University, Sweden.
    Arvidsson, Åke
    Ericsson AB, Sweden.
    Du, Manxing
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Huimin
    RISE, Swedish ICT, Acreo.
    Kihl, Maria
    Lund University, Sweden.
    Höst, Sefan
    Lund University, Sweden.
    Lagerstedt, Chhristina
    RISE, Swedish ICT, Acreo.
    User profiling for pre-fetching or caching in a catch-up TV network2016In: 2016 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB), 2016, article id 7521984Conference paper (Refereed)
    Abstract [en]

    We investigate the potential of different pre-fetching and/or caching strategies for different user behaviour with respect to surfing or browsing in a catch-up-TV network. To this end we identify accounts and channels associated with strong or weak surfing or browsing respectively and study the distributions of hold times for the different types of behaviour. Finally we present results from a request prediction model and a caching simulation for the different types of behaviour and find that the results are relatively similar.

  • 655.
    Andersson, Jerker
    et al.
    Rise SICS AB.
    Andersson, Per
    Rise SICS AB.
    On the usage of knowledge based techniques in configuring computer systems: a case study1989Report (Other academic)
    Abstract [en]

    The aim of the thesis has been to define the domains of control structure specification and process station configuration in order to find a general approach applicable to problems concerning the configuration of a process control system or any similar system. These findings are then used as the foundation for constructing a knowledge based system capable of realizing a problem solving method pertaining to the domain of configuring a specific computer system.

  • 656.
    Andersson, Jim
    et al.
    Luleå University of Technology, Sweden.
    Umeki, Kentaro
    Luleå University of Technology, Sweden.
    Furusjö, Erik
    Luleå University of Technology, Sweden.
    Kirtania, Kawnish
    Luleå University of Technology, Sweden.
    Weiland, Fredrik
    RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
    Multiscale Reactor Network Simulation of an Entrained Flow Biomass Gasifier: Model Description and Validation2017In: Energy Technology, ISSN 2194-4288, Vol. 5, p. 1-12Article in journal (Refereed)
    Abstract [en]

    This paper describes the development of a multiscale equivalent reactor network model for pressurized entrained flow biomass gasification to quantify the effect of operational parameters on the gasification process, including carbon conversion, cold gas efficiency, and syngas methane content. The model, implemented in the commercial software Aspen Plus, includes chemical kinetics as well as heat and mass transfer. Characteristic aspects of the model are the multiscale effect caused by the combination of transport phenomena at particle scale during heating, pyrolysis, and char burnout, as well as the effect of macroscopic gas flow, including gas recirculation. A validation using experimental data from a pilot-scale process shows that the model can provide accurate estimations of carbon conversion, concentrations of main syngas components, and cold gas efficiency over a wide range of oxygen-to-biomass ratios and reactor loads. The syngas methane content was most difficult to estimate accurately owing to the unavailability of accurate kinetic parameters for steam methane reforming.

  • 657.
    Andersson, Joel
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Lennqvist, Andreas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Andersson, Petra
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Tuovinen, Heimo
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Blomqvist, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    A burn-through model for textile membranes in buildings as a tool in performance based fire safety engineering2010Report (Refereed)
  • 658. Andersson, Johan
    et al.
    Andersson, Stefan
    Boortz, Kent
    Carlsson, Mats
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Nilsson, Hans
    Sjöland, Thomas
    RISE - Research Institutes of Sweden, ICT, SICS.
    Widén, Johan
    RISE - Research Institutes of Sweden, ICT, SICS.
    SICStus Prolog user's manual, version 2.1 #81993Report (Other academic)
    Abstract [en]

    This Manual corresponds to SICStus Prolog release 2.1. #8 Prolog is a simple but powerful programming language developed at the University of Marseilles (Prolog : Manuel de Reference et d'Utilisation by P.Roussel, Groupe d'Intelligence Artificielle, Marseille-Luminy, 1975), as a practical tool for programming in Logic (Logic for Problem Solving by R.A. Kowalski, DCL Memo 75, Dept. of Artificial Intelligence, University of Edinburgh, March, 1974.)) From a user's point of view the major attraction of the language is ease of programming. Clear, readable, concise programs can be written quickly with few errors. This manual describes a Prolog system developed at the Swedish Institute of Computer Science in collaboration with Ericsson Telecom AB, NobelTech Systems AB, Infologics AB and Televerket under the IT4 program. The system consists of a WAM emulator written in C, a library and runtime system written in C and Prolog and an interpreter and a compiler written in Prolog. The Prolog engine is a Warren Abstract Machine (WAM) emulator defined by D:H:D: Warren in An Abstract Prolog Instruction Set, Tech. Note 309, International, Menlo Park, CA, 1983. Two modes of compilation are available: in-core i.e. incremental, and file-to-file.

  • 659.
    Andersson, Johan
    et al.
    RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
    Nordberg, Åke
    SLU Swedish University of Agricultural Sciences, Sweden.
    Westin, Gunnar
    RISE - Research Institutes of Sweden, Bioeconomy, Processum.
    Askfilter för rening av svavelväte i deponigas2017Report (Other academic)
    Abstract [en]

    Landfill gas is formed under anaerobic conditions in landfills by microbial degradation of organic material. The gas composition can vary, but at Swedish landfills the gas generally consists of 40-60% methane, 30-40% carbon dioxide and 5-20% nitrogen. Hydrogen sulphide (H2S) is a highly toxic and corrosive gas, which occur in landfill gas in varying concentrations, from 10 to 30,000 ppm (equivalent to 0.001 to 3.0%). It is desirable that the landfill gas is used for electricity and/or heat production, but to do that there is a need to clean the gas to reach <200 ppm H2S. High levels of H2S increases wear on the engine/boiler and thus the frequency of servicing. This leads to expensive maintenance costs, and ultimately shortens the economic life of the plant. To reduce corrosion, it is common to adjust the flue gas temperature, but this also leads to a lower efficiency and thus reduces the energy utilization of the gas. In some cases the gas concentration of H2S is judged to be too high to be used for energy production at all. In 2015, approximately 53 GWh of landfill gas was flared in Sweden, which in many cases is due to problems with high levels of H2S.

     

    Cleaning of landfill gas from H2S leads to several values; the gas energy is used efficiently, maintenance and service costs of the engines/boiler are reduced, and emissions of acidifying sulphur dioxide from combustion of landfill gas decreases. There are commercial cleaning technologies for H2S but they are expensive, both in terms of capital cost and operating cost. Thus, there is a need to develop new cost efficient cleaning technologies that improve the economic outcome at landfills and that enables landfill gas with high H2S concentrations to be utilized for valuable energy transformation.

     

    RISE (formerly JTI – Swedish Institute of Agricultural and Environmental Engineering) together with SLU develops new, potentially cost-efficient methods for upgrading biogas to fuel quality. One of the methods is based on the gas passing through a bed of moist ash (a so-called ash filter), where carbon dioxide and H2S are fixed. The hypothesis of this project was that ashes originating from the incineration of waste, recycled waste wood etc., can be used to clean the high levels of H2S in landfill gas. This type of ashes will usually be disposed of in landfills anyway and if the treatment effect is good, it would generate synergy effects in the form of the ash first being used to clean landfill gas from sulphur before it is used as a construction material at landfills.

     

    This project performed two trials in pilot scale at a Swedish landfill with very high concentration of H2S, approximately 15,000 ppm. Different gas flow rates were studied (0.7 to 7.6 m3 / h), while the volume of ash used were similar in the two trials, 0,37 m3. The concentration of H2S in the cleaned gas was consistently very low during treatment, < 10 ppm at low gas flow rates and < 200 ppm at high gas flow rates. Two types of ash were investigated and both proved to have very good capacity to fix H2S, 44-61 g H2S/kg dry ash. In comparison with literature values, there is only one study showing an uptake capacity in the same order. Other studies report an order of magnitude lower uptake capacity.

    Based on the experimental results, the technical and economic potential for an ash filter as the cleaning method was assessed. The calculations were made for various typical landfills to cover the different range of landfills. For normal sized landfills with gas flow rates of 100-1 000 m3/h and H2S concentrations between 100 and 1 000 ppm, the amount of ash needed is 10-130 tons of dry ash per year. For the special case where the H2S concentration is extremely high, the amount of ash increases and a plant with 15 000 ppm H2S and a gas flow rate of 200 m3/h requires approximately 800 tons of dry ash per year. However, overall modest amounts of ash is required and considering all Swedish landfills the requirement of ash would be only 0.2-0.3% of the annual production of ash in Sweden.

     

    The economic calculations show that the ash filter is a competitive method for removal of H2S. For the special case of extremely high levels of H2S, it turned out that the cost of the ash filter is approximately 20% lower in comparison with the cheapest feasible conventional cleaning technology on the market. Also for the cleaning of landfill gas at more normal levels of H2S, the ash filter is competitive. At low gas flow rates (100 m3/h), the ash filter is clearly competitive compared to literature values for conventional cleaning technologies. The economy of scale seems to be higher for the conventional cleaning technologies, and consequently the difference between the cost of ash filter cleaning and other technologies is less at higher gas flow rates.

     

    The low treatment cost of the ash filter reveals opportunities for landfills that currently do not clean the gas from H2S. During the project 15 Swedish landfills was contacted and none of these reported any form of H2S cleaning. When using cleaning, the landfill gas can be used effectively, i.e. reduced flaring, increased efficiency of electricity and heat production with reduced wear on boilers and combustion equipment as well as reduced emissions of sulphur into the atmosphere, which also reduces the potential odour problems around the landfill.

     

    For further development, the design of an ash filter module prototype at full-scale is important. Furthermore, the treated ashes should be analysed for leaching characteristics, storability and usability as construction materials or as cover landfills along with an assessment of the overall environmental impact. Further tests at full scale should be made at other landfills with various gas flow rates and H2S concentrations to verify the performance of the conducted pilot tests.

  • 660.
    Andersson, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Olsson, Henrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Ascue, Johnny
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Rogstrand, Gustav
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Processintern metananrikning vid gödselrötning: försök i pilotskala2014Report (Refereed)
  • 661.
    Andersson, Jonas
    et al.
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Habibovic, Azra
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Klingegård, Maria
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Englund, Cristofer
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Malmsten-Lundgren, Victor
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Hello Human, can you read my mind?2017In: ERCIM News, ISSN 0926-4981, E-ISSN 1564-0094, no 109, p. 36-37Article in journal (Other academic)
    Abstract [en]

    For safety reasons, autonomous vehicles should communicate their intent rather than explicitly invitepeople to act. At RISE Viktoria in Sweden, we believe this simple design principle will impact howautonomous vehicles are experienced in the future

  • 662. Andersson, Jonas
    et al.
    Lönnermark, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, skydd (BRs ).
    External conditions have a significant impact on the air flow in tunnels using transverse ventilation for smoke extraction2012In: Proceedings from the Fifth International Symposium on Tunnel Safety and Security, SP , 2012, , p. 319-327Conference paper (Other academic)
  • 663.
    Andersson, Jonas
    et al.
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Nilsson, Maria
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Pettersson, Stefan
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Introducing wireless charging for drivers of electrical vehicles in Sweden—Effects on charging behaviour and attitudes2017In: Adv. Intell. Sys. Comput., 2017, p. 951-962Conference paper (Refereed)
    Abstract [en]

    This paper reports on a Swedish large-scale research and demonstration study of wireless charging of electric vehicles. The study is the first of its kind outside North America. The purpose of the 18-month study was to test the technology during real life working conditions using 20 electric vehicles located at eight municipality and company sites in Sweden. The study indicates that the charging behaviour will most likely be different with inductive charging. There are clear benefits of inductive charging that have the potential to increase the attractiveness of electric vehicles, and there are no substantial evidence that perceived safety should hinder a wider adoption of inductive charging. Further, we conclude that the usability of the technology can have a high impact on perceived attractiveness, and should therefore be of focus in future developments of the technology.

  • 664.
    Andersson, K
    SIK – Institutet för livsmedel och bioteknik.
    Influence of reduced oxygen concentrations on lipid oxidation in food during storage1998Report (Refereed)
  • 665.
    Andersson, K
    SIK – Institutet för livsmedel och bioteknik.
    Life cycle assessment (LCA) of food products and production systems1998Report (Refereed)
  • 666.
    Andersson, K
    SIK – Institutet för livsmedel och bioteknik.
    Livscykelanalys av livsmedelsprodukter och produktionssystem1999Report (Refereed)
  • 667.
    Andersson, K
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedelsforskning.
    The influence of oxygen content on lipid oxidation in foods : a literature review1995Report (Refereed)
  • 668. Andersson, K
    et al.
    Kizling, J
    YKI – Ytkemiska institutet.
    Holmberg, K
    YKI – Ytkemiska institutet.
    Byström, S
    A ring-opening reaction performed in a microemulsion1998In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 144, p. 259-266Article in journal (Refereed)
  • 669.
    Andersson, K
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedelsforskning.
    Ohlsson, T
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedelsforskning.
    Olsson, P
    Life cycle assessment (LCA) of food products and production systems : report to the Swedish Waste Research Council (AFR), June 30, 19931993Report (Refereed)
  • 670.
    Andersson, Kajsa
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Lindahl, Markus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Nowak, Tomas
    Polyzou, Olympia
    Coevoet, Michel
    Zottl, Andreas
    Report on main points for improvement of existing or future legislation on HP systems2011Report (Other (popular science, discussion, etc.))
  • 671.
    Andersson, Karin
    SIK – Institutet för livsmedel och bioteknik.
    LCA of food products and production systems.2000In: International Journal of Life Cycle Assessment, Vol. 5, no 4, p. 239-248Article in journal (Refereed)
  • 672.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Eide, Merete Høgaas
    SIK – Institutet för livsmedel och bioteknik.
    Lundqvist, U.
    Mattsson, Berit
    SIK – Institutet för livsmedel och bioteknik.
    The feasibility of including sustainability in LCA for product development1998In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 6, no 42067, p. 289-298Article in journal (Refereed)
    Abstract [en]

    The feasibility of combining the concept of sustainability principles and the methodology of Life Cycle Assessment (LCA) is examined. The goal is to achieve an operational tool that incorporates sustainability in product development and strategic planning. While the method outlined has the structure of LCA, it emphasises aspects and parameters often omitted from traditional LCA. The analysis and results can be either qualitative or semi-quantitative. Although a qualitative analysis is less time consuming, it can still highlight the important issues. Qualitative information, which is easily lost in a quantitative analysis, can be emphasised. One of the conclusions is that the method is well suited for screening analysis. © 1998 Elsevier Science Ltd. All rights reserved.

  • 673.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Eide, Merete Høgaas
    SIK – Institutet för livsmedel och bioteknik.
    Lundqvist, Ulrika
    Mattsson, Berit
    SIK – Institutet för livsmedel och bioteknik.
    Feasibility of including sustainability in LCA for product development1998In: Journal of cleaner production, ISSN 0346-718X, Vol. 6, no 3-4, p. 289-98Article in journal (Refereed)
    Abstract [en]

    The feasibility of combining the concept of sustainability principles and the methodology of Life Cycle Assessment (LCA) is examined. The goal is to achieve an operational tool that incorporates sustainability in product development and strategic planning. While the method outlined has the structure of LCA, it emphasizes aspects and parameters often omitted from traditional LCA. The analysis and results can be either qualitative or semi-quantitative. Although a qualitative analysis is less time consuming, it can still highlight the important issues. Qualitative information, which is easily lost in a quantitative analysis, can be emphasized. One of the conclusions is that the method is well suited for screening analysis.

  • 674.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Lingnert, Hans
    SIK – Institutet för livsmedel och bioteknik.
    Influence of oxygen and copper concentration on lipid oxidation in rapeseed oil1998In: Journal of the American Oil Chemists Society, ISSN 0003-021X, E-ISSN 1558-9331, Vol. 75, no 8, p. 1041-1046Article in journal (Refereed)
    Abstract [en]

    The influence of oxygen concentration and copper on lipid oxidation in rapeseed oil during storage at 40°C was investigated. The oil was stored in air, or with 1.1%, 0.17%, or 0.04% oxygen in the headspace, and 70 or 0.07 ppm copper was added. Volatile oxidation products and oxygen consumption were monitored. Addition of 70 ppm copper to the sample in air resulted in a 70-fold higher hexanal concentration after 35 d of storage, compared to the sample without added copper. The addition of 0.07 ppm copper to the sample stored in air gave a doubled hexanal concentration, compared to the sample without copper, after 35 d of storage. For the samples with 70 ppm copper at 0.17% and 0.04% oxygen, all oxygen was consumed after 7 d of storage. The results show the importance of minimizing the oxygen available for oxidation, especially when pro-oxidants are present. In the sample with 70 ppm added copper, in air, the hexanal increase was 65 times larger than for the same sample in 0.04% oxygen. A comparison of the effect of oxygen or copper on oxidation shows that the addition of 70 ppm copper to the 0.04% oxygen sample gave the same increase in hexanal content as an oxygen increase to 0.17%.

  • 675.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Lingnert, Hans
    SIK – Institutet för livsmedel och bioteknik.
    Influence of oxygen concentration and light on the oxidative stability of cream powder1998In: Lebensmittel-Wissenschaft + Technologie, ISSN 0023-6438, E-ISSN 1096-1127, Vol. 31, no 2, p. 169-176Article in journal (Refereed)
    Abstract [en]

    The production of volatile oxidation products and consumption of oxygen were measured in cream powder stored for 35 weeks at 30 °C in darkness or exposed to fluorescent light. The headspace of the bottles contained either air (209 mL O 2/L) or 13, 3.5, 0.4 or 0.3 mL/L oxygen in nitrogen. The exposure to light strongly influenced both the rate of hexanal production and oxygen consumption. After the first 5 weeks of storage in light, significantly different oxygen-dependent increases in hexanal were found for all samples. Although the samples stored in darkness showed a much smaller hexanal increase, it was still significant during storage. After 35 weeks of storage, the dark-stored sample in air showed a highly significant larger hexanal increase than all the other samples stored in darkness, but after the same storage period, the hexanal increase in the 13, 3.6 and 0.4 mL O 2/L samples was the same. The production of the Strecker aldehyde, 3-methylbutanal, was found to depend on light and to some extent on oxygen concentration, which indicates that lipid oxidation also influenced the conditions of the Maillard reaction. © 1998 Academic Press Limited.

  • 676.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Lingnert, Hans
    SIK – Institutet för livsmedel och bioteknik.
    Influence of oxygen concentration on the flavour and chemical stability of cream powder1998In: Lebensmittel-Wissenschaft + Technologie, ISSN 0023-6438, E-ISSN 1096-1127, Vol. 31, no 3, p. 245-251Article in journal (Refereed)
    Abstract [en]

    Descriptive sensory analysis and analysis of hexanal content were performed on cream powder stored in darkness at different oxygen concentrations at 30 °C for up to 45 weeks. The headspace of the samples contained 209 (air), 13, 3.6, 0.4 or 0.3 m/L oxygen/L headspace gas. All samples stored with reduced oxygen content were, with one exception, significantly different from the air-packed sample after 25 as well as after 45 weeks of storage, both in their hexanal concentration and according to sensory analysis. However, there were no significant sensory differences between the samples stored with reduced oxygen for 25 or 45 weeks. Analysis of the hexanal concentration in the samples was a more sensitive method than sensory analysis for detecting differences between samples stored for the same length of time. Furthermore, some of the samples with reduced oxygen concentration were found to differ significantly in their hexanal concentration. Significant differences between samples before storage and samples stored for 25 or 45 weeks, regardless of oxygen concentration, were found by both sensory and chemical analyses. © 1998 Academic Press.

  • 677. Andersson, Karin
    et al.
    Lingnert, Hans
    SIK – Institutet för livsmedel och bioteknik.
    Influence of oxygen concentration on the storage stability of cream powder1997In: Lebensmittel-Wissenschaft + Technologie, ISSN 0023-6438, E-ISSN 1096-1127, Vol. 30, no 2, p. 147-154Article in journal (Refereed)
    Abstract [en]

    The influence of low oxygen concentrations on lipid oxidation during storage of cream powder was studied. The powder was packed with oxygen concentrations of 209 mL/L, 17 mL/L, 8.3 mL/L, 3.4 mL/L, 1.5 mL/L, 0.7 mL/L and 0.6 mL/L and stored in darkness at 30°C for 29 weeks. To follow oxidation, the formation of volatile oxidation products and oxygen consumption were measured. After 7 weeks of storage a significant (P <0.01) hexanal development was already seen in all the samples, and the hexanal content was directly related to the initial oxygen content, with one exception, the 0.6 mL/L sample, which had a slightly (but not significantly, P >0.05) higher hexanal content than the 0.7 mL/L sample. There were only small differences in hexanal formation between the samples packed with oxygen concentrations below 3.4 mL/L. This could be due to a more pronounced influence of oxygen diffusion at these low levels of oxygen, leading to a diffusion-controlled oxidation. Other volatiles, not produced by lipid oxidation, also increased during storage. The formation of Strecker aldehydes was found to be oxygen-dependent, whereas the formation of 2-alkanones was not. Measurement of oxygen consumption was not sufficient to detect differences in oxidation rate between the samples packed with 17 mL/L oxygen and less. © 1997 Academic Press Limited.

  • 678.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Lingnert, Hans
    SIK – Institutet för livsmedel och bioteknik.
    Kinetic studies of oxygen dependence during initial lipid oxidation in rapeseed oil1999In: Journal of Food Science, ISSN 0022-1147, E-ISSN 1750-3841, Vol. 64, no 2, p. 262-266Article in journal (Refereed)
    Abstract [en]

    Lipid oxidation was studied in rapeseed oil, stored at 35 or 50°C in 0.03, 0.3, 1.0 or 1.8% oxygen for 42 days. Peroxide value (PV), oxygen consumption, tocopherol consumption and production of volatile compounds were analyzed to follow the oxidation. At 50°C, lipid oxidation measured as oxygen consumption or PV was only slightly influenced by oxygen concentration ?1%. Below 0.5% the influence was strongly enhanced. The production of volatiles showed different relationships to oxygen concentration and some compounds were produced in larger amounts at lower O2, than at higher O2 concentrations.

  • 679.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Ohlsson, Thomas
    SIK – Institutet för livsmedel och bioteknik.
    Including environmental aspects in production development: A case study of tomato ketchup1999In: Lebensmittel-Wissenschaft + Technologie, ISSN 0023-6438, E-ISSN 1096-1127, Vol. 32, no 3, p. 134-141Article in journal (Refereed)
    Abstract [en]

    An environmental Life Cycle Assessment (LCA) study of a specific tomato ketchup was carried out. The objectives of the work were to illustrate how LCA can be used in production development; to investigate the influence of the geographical location of certain processes; and to find ways to improve the product's environmental performance. In the screening LCA which includes the whole life cycle, the packaging and processing sub-systems were found to be significant in the total environmental impact made by ketchup. Accordingly, six alternative systems, including packaging, processing and transportation, were modelled and simulated. The environmental impact categories included were energy use, global warming, acidification, eutrophication, photo-oxidant formation and the generation of radioactive waste. It was concluded that the current geographical location of the production of ketchup is preferable; the contributions to acidification can be reduced significantly; and the environmental profile of the product can be improved for either the type of tomato paste currently used or a less concentrated tomato paste. A shift to a less concentrated paste would also mean that traditional quality parameters of the ketchup could be improved. © 1999 Academic Press.

  • 680.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Ohlsson, Thomas
    SIK – Institutet för livsmedel och bioteknik.
    Life cycle assessment of bread produced on different scales1999In: The International Journal of Life Cycle Assessment, ISSN 0948-3349, E-ISSN 1614-7502, Vol. 4, no 1, p. 25-40Article in journal (Refereed)
    Abstract [en]

    A case study of white bread has been carried out with the purpose of comparing different scales of production and their potential environmental effects. The scales compared are: home baking, a local bakery and two industrial bakeries with distribution areas of different sizes. Data from the three bakeries and their suppliers have been collected. The systems investigated include agricultural production, milling, baking, packaging, transportation, consumption and waste management. Energy use and emissions have been quantified and the potential contributions to global warming, acidification, eutrophication and photo-oxidant formation have been assessed. The large industrial bakery uses more primary energy and contributes more to global warming, acidification and eutrophication than the other three systems. The home baking system shows a relatively high energy requirement; otherwise, the differences between home baking, the local bakery and the small industrial bakery are too small to be significant.

  • 681.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Ohlsson, Thomas
    SIK – Institutet för livsmedel och bioteknik.
    Life cycle assessment of bread produced on different scales1999In: Internaional journal of life cycle assessment, ISSN 0346-718X, Vol. 4, no 1, p. 25-40Article in journal (Refereed)
    Abstract [en]

    A case study of white bread has been carried out with the purpose to compare different scales of production and their potential environmental effects. The scales compared are: home baking, a local bakery and two industrial bakeries with distribution areas of different sizes. Data from the three bakeries and their suppliers have been collected. The systems investigated include agricultural production, milling, baking, packaging, transportation, consumption and waste management. Energy use and emissions have been quantified and the potential contributions to global warming, acidification, eutrophication and photo-oxidant formation have been assessed. The large industrial bakery uses more primary energy and contributes more to global warming, acidification and eutrophication than the other three systems. The home baking system shows a relatively high energy requirement; otherwise, the differences between home baking, the local bakery and the small industrial bakery are too small to be significant.

  • 682.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedelsforskning.
    Ohlsson, Thomas
    SIK – Institutet för livsmedelsforskning.
    Olsson, P.
    Life cycle assessment (LCA) of food products and production systems1994In: Trends in Food Science & Technology, ISSN 0924-2244, E-ISSN 1879-3053, Vol. 5, no 5, p. 134-138Article in journal (Refereed)
    Abstract [en]

    In the late 1980s the demands for a more ecological life style and sustainability set off intense research for methods to analyse and assess the environmental impact of products and systems. The methodology crystallizing from this research is called life cycle assessment (LCA). This paper presents the concept, methodology, applications and present status of LCA. LCA as applied to food production systems is discussed in terms of needs, special demands on methodology, the studies that have been performed and ongoing activities. © 1994.

  • 683.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Ohlsson, Thomas
    SIK – Institutet för livsmedel och bioteknik.
    Olsson, P.
    Screening life cycle assessment (LCA) of tomato ketchup: A case study1998In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 6, no 42067, p. 277-288Article in journal (Refereed)
    Abstract [en]

    A screening life cycle assessment (LCA) of tomato ketchup has been carried out. The purpose was to identify 'hot-spots', that is parts of the life-cycle that are important to the total environmental impact. The system investigated includes agricultural production, industrial refining, packaging, transportation, consumption and waste management. Energy use and emissions were quantified and some of the potential environmental effects assessed. Packaging and food processing were found to be hot-spots for many, but not all, of the impact categories investigated. For primary energy use, the storage time in a refrigerator (household phase) was found to be a critical parameter. © 1998 Elsevier Science Ltd. All rights reserved.

  • 684.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Ohlsson, Thomas
    SIK – Institutet för livsmedel och bioteknik.
    Olsson, Par
    Life cycle assessment (LCA) of food products and production systems1994In: Trends in Food Science and Technology, ISSN 0346-718X, Vol. 5, no 5, p. 134-138Article in journal (Refereed)
    Abstract [en]

    In the late 1980s the demands for a more ecological life style and sustainability set off intense research for methods to analyze and assess the environmental impact of products and systems. The methodology crystallizing from this research is called life cycle assessment (LCA). This paper presents the concept, methodology, applications and present status of LCA. LCA as applied to food production systems is discussed in terms of needs, special demands on methodology, the studies that have been performed and ongoing activities.

  • 685.
    Andersson, Karin
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Ohlsson, Thomas
    SIK – Institutet för livsmedel och bioteknik.
    Olsson, Par
    Screening Life Cycle Assessment (LCA) of tomato ketchup: A case study1998In: Journal of cleaner production, ISSN 0346-718X, Vol. 6, no 3-4, p. 277-88Article in journal (Refereed)
    Abstract [en]

    A Screening Life Cycle Assessment (LCA) of tomato ketchup has been carried out. The purpose was to identify `hot-spots', that is parts of the life-cycle that are important to the total environmental impact. The system investigated includes agricultural production, industrial refining, packaging, transportation, consumption and waste management. Energy use and emissions were quantified and some of the potential environmental effects assessed. Packaging and food processing were found to be hot-spots for many, but not all, of the impact categories investigated. For primary energy use, the storage time in a refrigerator (household phase) was found to be a critical parameter.

  • 686.
    Andersson, Klas-Gustaf
    Hållfasthet (BMh).
    Provning av bomhållare för ridsport1997Report (Refereed)
  • 687.
    Andersson, KM
    et al.
    YKI – Ytkemiska institutet.
    Bergström, L
    YKI – Ytkemiska institutet.
    Density measurements of single granules using the atomic force microscope2005In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 88, p. 2322-2324Article in journal (Refereed)
    Abstract [en]

    The density of single spray-dried granules has been determined with a new method based on the atomic force microscopy (AFM). Spherical granules with a well-defined diameter are attached to the AFM cantilever, which acts as a beam type spring, and the mass of a granule is estimated from the shift in the resonant frequency. The error of the measurements associated with the method was estimated to vary between 1-5% depending on the size and shape of the granule. Density measurements of spray-dried WC-Co granules are presented and the effect of a polymeric binder and dispersant on the consolidation during drying is discussed

  • 688.
    Andersson, KM
    et al.
    YKI – Ytkemiska institutet.
    Bergström, L
    YKI – Ytkemiska institutet.
    DLVO interactions of tungsten oxide and cobalt oxide surfaces measured with the colloidal probe technique2002In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 246, p. 309-315Article in journal (Refereed)
    Abstract [en]

    We have investigated the DLVO surface forces of oxidised tungsten and cobalt surfaces using the atomic force microscope (AFM) colloidal probe technique. It was shown by X-ray Photoelectron Spectroscopy (XPS), and electrokinetic measurements that this model system is representative for industrial WC and Co powders used in the production of hard metals. We found that the attractive van der Waals forces are well described by Hamaker constants, calculated from optical data for WO3 and CoOOH. The repulsive electrostatic double layer forces between WO3 surfaces increase with increasing pH due to an increasingly negative surface potential. This surface potential decreases with increasing ionic strength at pH 7.5. The electrostatic interaction between WO3 and CoOOH is attractive at pH 10, suggesting a positively charged CoOOH surface.

  • 689.
    Andersson, KM
    et al.
    YKI – Ytkemiska institutet.
    Bergström, L
    YKI – Ytkemiska institutet.
    Effect of cobalt ion and polyethyleneimine adsorption on the surface forces between tungsten oxide and cobalt oxide in aqueous media2002In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 85, p. 2404-2408Article in journal (Refereed)
    Abstract [en]

    We used the colloidal probe technique with the atomic force microscope (AFM), to study the interactions between a tungsten oxide sphere, WO3, and flat oxidized tungsten and cobalt surfaces in aqueous electrolytes. We have investigated the effects of adsorption of cobalt ions to tungsten oxide surfaces and adsorption of polyethyleneimine (PEI). Low concentrations of cobalt ions to a WO3system resulted in extended hydration forces and lower absolute value of the surface potential. It was shown that PEI adsorbs to the WO3 surfaces and induces an electrosteric repulsion in both the symmetric (WO3-WO3) and asymmetric (WO3-CoOOH) system. The possible complexation of cobalt ions with PEI does not significantly influence the thickness of the adsorbed layer

  • 690.
    Andersson, KM
    et al.
    YKI – Ytkemiska institutet. Stockholms Universitet.
    Bergström, L
    Stockholms Universitet.
    Friction and adhesion of single spray-dried granules containing a hygroscopic polymeric binder2005In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 155, p. 101-107Article in journal (Refereed)
    Abstract [en]

    The atomic force microscope has been used to study the friction and adhesion of single spray dried granules containing a mixture of fine tungsten carbide and cobalt powders and various amounts of a polymeric binder, polyethylene glycol (PEG). The adhesion or the pull-off force and the friction force between two single granules (representing intergranular friction) and between a granule and a hard metal substrate (representing die-wall friction) have been determined as a function of relative humidity. We found that the granule-wall friction increases with binder content and relative humidity. The small friction force at the lowest addition of PEG was related to a small contact area due to the high surface roughness of the granules. The substantial increase in the friction coefficient at PEG-addition>1wt% was related to the plasticity of the binder-rich granule surface where an increase in binder content or relative humidity increases the deformability. The granule-granule friction and adhesion is independent of the relative humidity and substantially lower than the granule-wall friction at all PEG contents, which has important implications for the handling of granular matter

  • 691.
    Andersson, KM
    et al.
    YKI – Ytkemiska institutet.
    Bergström, L
    YKI – Ytkemiska institutet.
    Oxidation and dissolution of tungsten carbide powder in water2000In: Int J Refract Met Hard Mater, ISSN 0263-4368, Vol. 18, p. 35-43Article in journal (Refereed)
    Abstract [en]

    The oxidation and dissolution of tungsten carbide powder dispersed in water was investigated using XPS and leaching studies. We found that the WO3 surface layer on the oxidised tungsten carbide powder dissolves readily at pH>3 with the tungsten concentration increasing linearly with time. Adding cobalt powder to the tungsten carbide suspension resulted in a significant reduction of the dissolution rate at pH<10, when the concentration of dissolved Co is high in the solution phase. Electrokinetic studies indicate that the reduced dissolution rate may be related to the formation of surface complexes; experiments showed that Co species in solution adsorb on the oxidised tungsten carbide powder. The experimental data were discussed in relation to theoretical modelling of the WO3 solution chemistry and the Co2+ adsorption at oxide/water interfaces

  • 692.
    Andersson, Kristina
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Thylén, Anders
    Larsson, Kjell
    Utfodringssystem för slaktsvin med blandning av foder och vätska på boxnivå1993Report (Refereed)
  • 693.
    Andersson, L
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, TräteknikCentrum , Trätek.
    Krypgrundssystem för moderna småhus utvecklingsmöjligheter1987Report (Other academic)
    Abstract [sv]

    Högre isolerstandard och ökade täthetskrav ökar risken för skador i kryprum. Ny teknik behövs, oftast kan åtgärderna vara enkla. System för kryprumsgrundläggning har studerats förutsättningslöst för att föreslå förbättringar som ökar säkerheten mot fuktskador. Kalla och varma krypgrunder har studerats i litteratur, vid besök, i kontakt med experter i Sverige och utomlands samt vid beräkningar och försök. Idéer till åtgärder, såsom modifieringar av material, konstruktion, ventilation samt till konstruktionslösningar och forskningsuppgifter, ges.

  • 694.
    Andersson, L
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, TräteknikCentrum , Trätek.
    Lastpallar av trä - statisk eller dynamisk provning?1986Report (Other academic)
  • 695.
    Andersson, L
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek..
    Putsning av möbelkomponenter med hjälp av industrirobot1990Report (Other academic)
    Abstract [sv]

    Gjorda försök visar att industrirobotar kan utnyttjas för finputsning av träkomponenter. Det är dock nödvändigt att detaljerna tillverkas så att form och mått kan förutsägas inom givna toleranser. I många fall kan detta krav uppfyllas genom CNC-bearbetning. Mindre detaljer kan med fördel hållas av roboten, större laminerade detaljer bör spännas upp i fixturer. Rekommendationer om hur man bör gå till väga finns i rapporten.

  • 696. Andersson, L.
    et al.
    Larsson, P.T.
    RISE, Innventia.
    Wågberg, L.
    Bergström, L.
    Evaluating pore space in macroporous ceramics with water-based porosimetry2013In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, no 6, p. 1916-1922Article in journal (Refereed)
  • 697.
    Andersson, L.
    et al.
    RISE - Research Institutes of Sweden, Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Silfwerbrand, Johan
    KTH Royal Institute of Technology, Sweden.
    Selander, A.
    Cementa AB, Sweden.
    Trägårdh, Jan
    RISE - Research Institutes of Sweden, Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Continuous preventive bridge maintenance in Sweden - Field experiment on the effect of washing on concrete bridges2019In: Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, International Federation for Structural Concrete , 2019, p. 1135-1141Conference paper (Refereed)
    Abstract [en]

    Bridges are an important part of the infrastructure. For the bridges to have the longest possible service life with minimum repairs, the maintenance is of great importance. One type of bridge maintenance that is rarely researched is the continuous preventive maintenance. The continuous preventive maintenance consists of removal of vegetation, cleaning of bridge joints and drainage systems as well as high-pressure washing of the structure. The effects of washing is heavily discussed but not properly researched. A study on the effectiveness of washing concrete is therefore being conducted. A field experiment has been initiated where concrete specimens are installed on an edge beam of a road bridge. The specimens are of two recipes where one represents an old bridge with rather high water-cement ratio and the other one represents a new bridge with a low water-cement ratio. 50% of the specimens are washed annually, while the others are not. Each year samples are collected and tested for a chloride profile. The results for the first year of exposure have been determined. They are promising but are still only very preliminary. The effect of washing, if any, will be visible after a longer exposure.

  • 698.
    Andersson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Andningsmönstrets betydelse vid alkoholutandningsprov.1993Report (Refereed)
  • 699.
    Andersson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Container lashing.1997Report (Refereed)
  • 700.
    Andersson, Lars
    Hållfasthet (BMh).
    Container lashing rationale2001Report (Refereed)
11121314151617 651 - 700 of 21786
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