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  • 2301. Åhrén, Thomas
    et al.
    Parida, Aditya
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Overall railway infrastructure effectiveness (ORIE): a case study on the Swedish rail network2009Ingår i: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 15, nr 1, s. 17-30Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose - The main purpose of this paper is to develop an approach to analyzing the factors influencing the performance of railway infrastructure, to propose an approach to measuring the overall railway infrastructure effectiveness (ORIE), and to test these approaches in a case study to verify their effectiveness. Design/methodology/approach - The methodology adopted here was to develop a concept for measurement of the overall effectiveness of a railway infrastructure similar to that for measurement of the OEE. The concept thus developed was applied on Swedish railway track sections for collecting data and for their ORIE validation, as a case study. Findings - The findings of the ORIE case study show that the model can be used for other sections of the Swedish railways. It can also be applied to other railways with some modifications. Practical implications - ORIE can measure the extent to which the railway infrastructure system manages to deliver its agreed performance to the traffic operators. Infrastructure managers can also use the ORIE as a key performance indicator, which can provide important input for effective decision making. Originality/value - The paper presents a structured way of developing a conceptual ORIE model applied to the railway-sector. This model can be used by other railways with suitable modifications.

  • 2302. Åhrén, Thomas
    et al.
    Waara, Patric
    Larsson-Kråik, Per-Olof
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Technical and economic evaluation of maintenance for rail and wheels on Malmbanan2003Ingår i: Implementation of heavy haul technology for network efficiency: proceedings : International Heavy Haul Conference, Dallas, Texas, May 5-9, 2001, Virginia Beach, Va.: International Heavy Haul Association , 2003, s. 5.81-5.86Konferensbidrag (Refereegranskat)
  • 2303.
    Åström, Jan A.
    et al.
    Centre for Scientific Computing, Esbo.
    Ouchterlony, Finn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Linna, R.P.
    Department of Physics, University of Jyväskylä.
    Timonen, J.
    Department of Physics, University of Jyväskylä.
    Universal dynamic fragmentation in D dimensions2004Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 92, nr 24, s. 245506-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A generic model is introduced for brittle fragmentation in D dimensions, and this model is shown to lead to a fragment-size distribution with two distinct components. In the small fragment-size limit a scale-invariant size distribution results from a crack branching-merging process. At larger sizes the distribution becomes exponential as a result of a Poisson process, which introduces a large-scale cutoff. Numerical simulations are used to demonstrate the validity of the distribution for D = 2. Data from laboratory-scale experiments and large-scale quarry blastings of granitic gneiss confirm its validity for D = 3. In the experiments the nonzero grain size of rock causes deviation from the ideal model distribution in the small-size limit. The size of the cutoff seems to diverge at the minimum energy sufficient for fragmentation to occur, but the scaling exponent is not universal.

  • 2304.
    Öberg, Maria
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Nilsson, Kristina L.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Johansson, Charlotta
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Major transport corridors: the concept of sustainability in EU documents2016Ingår i: Transportation research procedia, 2016Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper results are presented from document- and literature studies examining how the concepts of sustainability and sustainable development (economical, ecological and social) are used in the process of developing main transport corridors in the European Union.  Particular focus has been placed on the Scandinavian-Mediterranean (ScanMed) transport corridor, a strategic part of the trans-European network for transports (TEN-T). European Union transport policy documents were studied along with the legislation for TEN-T and documents regarding implementation of the ScanMed corridor.

    The paper highlights that the concept of sustainable development is used in a multifaceted way, sometimes indicating the overarching goal of sustainability, sometimes indicating certain dimensions, and sometimes referring to conducting efforts in a sustainable way. This implies that stakeholders are led to perceive the concept in various ways, influencing how measures are implemented and how the economic, ecological and social dimensions of sustainability are integrated. Reinforcing a holistic perspective of sustainability and sustainable development as integrating economic, ecological and social benefits for a desired development would avoid the perception of sustainability as merely addressing a specific dimension, like environmental concerns. In part this could be strengthened by clearly framing the particular dimensions of sustainability being addressed in different parts of major transport corridor documents, for example; “economic sustainability” or “social sustainability”.

  • 2305.
    Öberg, Maria
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Nilsson, Kristina L.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Johansson, Charlotta
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Major transport corridors: the concept of sustainability in EU documents2017Ingår i: Transportation Research Procedia, ISSN 2324-9935, E-ISSN 2352-1465, Vol. 25, s. 3698-3706Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper results are presented from document- and literature studies examining how the concepts of sustainability and sustainable development (economical, ecological and social) are used in the process of developing main transport corridors in the European Union.  Particular focus has been placed on the Scandinavian-Mediterranean (ScanMed) transport corridor, a strategic part of the trans-European network for transports (TEN-T). European Union transport policy documents were studied along with the legislation for TEN-T and documents regarding implementation of the ScanMed corridor.

    The paper highlights that the concept of sustainable development is used in a multifaceted way, sometimes indicating the overarching goal of sustainability, sometimes indicating certain dimensions, and sometimes referring to conducting efforts in a sustainable way. This implies that stakeholders are led to perceive the concept in various ways, influencing how measures are implemented and how the economic, ecological and social dimensions of sustainability are integrated. Reinforcing a holistic perspective of sustainability and sustainable development as integrating economic, ecological and social benefits for a desired development would avoid the perception of sustainability as merely addressing a specific dimension, like environmental concerns. In part this could be strengthened by clearly framing the particular dimensions of sustainability being addressed in different parts of major transport corridor documents, for example; “economic sustainability” or “social sustainability”.

  • 2306.
    Öhrling, Therese
    et al.
    Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, Arbetsvetenskap.
    Kumar, Rupesh
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Abrahamsson, Lena
    Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, Arbetsvetenskap.
    Assessment of the development and implementation of tools in contract cleaning2012Ingår i: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 43, nr 4, s. 687-694Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper illustrates and discusses problems with the implementation and use of ergonomic tools and techniques in the process of cleaning. Cleaning is an occupation with a high risk of developing work-related disorders. One high-strain task where recommended tools and techniques are difficult to apply is cleaning staircases. This study evaluated the muscular activity of cleaners while mopping staircases using two different mop handles and found that an easily adjustable mop handle can decrease a cleaner’s physical load. The results also show that the implementation and contextualization of the mop are of great importance for how a mop is used. A more holistic approach is needed to improve the benefits of good tools and techniques in cleaning work. More research is needed on how workplace organization can be improved to support the implementation of strategies to increase the health of professional cleaners.

  • 2307.
    Öqvist, Jan
    et al.
    Luleå tekniska universitet.
    Rustan, Agne
    Luleå tekniska universitet.
    Sugande ventilation vid eldriven hjullastning under jord1989Rapport (Övrigt vetenskapligt)
  • 2308.
    Öqvist, Rikard
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik. Tyréns AB.
    Measurement and perception of sound insulation from 20 Hz between dwellings2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Population growth and urbanization are projected by the United Nations to add 2,5 billionpeople to the world’s urban population by 2050. We need to construct buildings in anunprecedented scale to meet global housing demand. Sustainable development is critical.Compared to traditional heavy constructions, lightweight wooden constructions are moreenvironmentally friendly and will play a key role in meeting future demands. However, thereare two major problems with lightweight constructions that need to be addressed: 1) Limitedlow frequency sound insulation and 2) Variations in sound insulation.Annoyance from walking sound tend to be higher in lightweight than in heavy constructionseven with the same measured sound insulation. The Swedish research program AkuLiteindicated that the correlation between measured sound insulation and annoyance wassignificantly improved by extending current evaluation methods from 50 Hz down to 20 Hz.Secondly, large variations in sound insulation between nominally identical lightweightconstructions are common, which leads to larger safety margins. By identifying and quantifyingunderlying causes, production costs can be minimized and the performance can be improved.The aim of the thesis is to develop a new evaluation method for impact sound insulation thatbetter correspond to rated annoyance, and to identify and control underlying causes forvariations in sound insulation. The thesis contains six papers.In Paper I and II, sound insulation measurements were carried out in a large number ofnominally identical rooms of two different industrially prefabricated lightweight woodenconstructions. The purpose was to assess and quantify the variations in impact and airbornesound insulation. In Paper I, 30 nominally identical apartments of a volume based system wasevaluated. The apartments on the highest floor achieved significantly better sound insulationdue to the extra weight on lower floors affecting the elastic connections between stories. InPaper II, 18 rooms of a cross-laminated timber system of plate elements were evaluated.Additionally, several potential parameters related to measurement uncertainty wereinvestigated.Paper III deals with measurement uncertainty. An empirical study of reverberation timemeasurements showed that current methods need to be improved, if sound insulationrequirements are to be extended to 20 Hz.Paper IV and V verified that the frequency range 20-50 Hz is important for walking soundannoyance, and that alternative frequency adaptation terms can improve the correlation betweenmeasured impact sound insulation and annoyance ratings. In Paper IV, the methodology was toperform extensive field measurements in apartment buildings of various construction types andto perform questionnaire surveys among the residents. In Paper V, the methodology was toevaluate annoyance based on binaural recordings of walking sound in a two-part listening test.In Paper VI, 70 measurements in a lightweight wooden system were evaluated to quantify thetotal variations in impact and airborne sound insulation from 20 and 50 Hz, respectively. It wasconcluded that the proposed metrics of impact sound insulation were primarily determined bythe impact sound level 20-40 Hz and that the measurement methods must be evaluatedthoroughly to avoid excessive safety margins.

    A new evaluation method for impact sound insulation from 25 Hz, that correspond to the ratedannoyance for both heavy and lightweight constructions is proposed. By using the proposedmethod and attending the specific causes for variations, the lightweight industry will be able todevelop improved multi-story dwellings with higher perceived acoustic quality.

  • 2309.
    Öqwist, Jan
    Luleå tekniska universitet.
    Sensorer: marknadsinventering av sensorer/givare för gas (NO, NO2, CO), radon, temperatur, lufthastighet, differenstryck samt fordonslägeskontroll för användning i underjordsgruvor1991Rapport (Övrigt vetenskapligt)
  • 2310.
    Rustan, Agne (Redaktör)
    Luleå tekniska universitet.
    Försiktig och skonsam sprängning under jord: diskussionsdagar i Luleå 17-18 september 19801980Rapport (Övrigt vetenskapligt)
  • 2311.
    Kumar, Uday (Redaktör)
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Karim, Ramin (Redaktör)
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Parida, Aditya (Redaktör)
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Tretten, Phillip (Redaktör)
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Proceedings of the 3rd international workshop and congress on eMaintenance: June 17-18 Luleå, Sweden : eMaintenance, Trends in technologies & methodologies, challenges, possibilites and applications2014Rapport (Refereegranskat)
    Abstract [en]

    Compilation of papers presented in the technical sessions during the eMaintenance 2014.

  • 2312.
    Swan, Graham (Redaktör)
    Luleå tekniska universitet.
    The stiffness of joints: a workshop report1981Rapport (Övrigt vetenskapligt)
44454647 2301 - 2312 av 2312
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