Sökning: "ljud nivåer"

Hittade 5 avhandlingar innehållade orden ljud nivåer.

  1. 1. Drum sound from floor coverings - objective and subjective assessment

    Författare :Ann-Charlotte Johansson; Teknisk akustik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vakuumteknik; vibrationer; akustik; hydraulik; Maskinteknik; vacuum technology; vibration and acoustic engineering; hydraulics; acoustic standard; Mechanical engineering; tapping machine; veneer flooring; parquet flooring; binaural recording; foot impact; loudness; sound quality; listening test; paired comparisons; walking sound; drum sound; building acoustics; psychoacoustics; laminate flooring;

    Sammanfattning : Drum sound is the sound produced when an object, such as a foot, hits the flooring in the room in which the receiving ear is located. Drum sound has attracted interest in recent years, particularly due to an increased use of thin floating floor constructions, such as veneer or laminate flooring, which can produce loud and sharp walking sound. LÄS MER

  3. 2. Noise in the preschool : health and preventive measures

    Författare :Fredrik Sjödin; Ulf Landström; Anders Kjellberg; Anders Knutsson; Mats Nilsson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Noise; hearing disorders; stress; health; occupational environment; preventive measures; intervention; Occupational and Environmental Medicine; arbets- och miljömedicin;

    Sammanfattning : This thesis is based on noise recordings and health evaluations carried out at preschools in the northern part of Sweden. Sound level recordings were made on individuals and by use of stationary devices in dining rooms and play halls. Health evaluations were based on ratings by use of questionnaires and by analyses of cortisol. LÄS MER

  4. 3. Towards an efficient use of infrastructure and the built environment : Essays in transport and housing economics

    Författare :Lina Jonsson; Fastighetsvetenskap; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Hedonic pricing; Noise; Railway traffic; Road traffic; Congestion pricing; Acceptability; Road user charging; Political Economy; Railway; Marginal cost; Accident probability; Level crossings; Housing Economics; Property tax;

    Sammanfattning : All four papers in the thesis share a common theme: how to achieve an efficient use of infrastructure and the built environment. In the presence of externalities, pricing according to the (short-run) marginal cost is one answer on how this can be achieved and the first two papers estimates parts of the marginal cost of traffic. LÄS MER

  5. 4. Det långa mötet - IT och skolan : om spridning och anammande av IT i den svenska skolan

    Författare :Anders Söderlund; Luleå tekniska universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Pedagogik; Education;

    Sammanfattning : Avhandlingen syftar till att beskriva och förstå hur IT spridits och anammats i den svenska skolan. Den vetenskapliga frågeställningen är om det är möjligt att att förstå IT-utvecklingen på skolområdet i termer av teknikspridning. LÄS MER

  7. 5. Security in Physical Distribution Networks - A Survey Study of Swedish Transport Operators

    Författare :Luca Urciuoli; Teknisk logistik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; antagonistic threats.; supply chain security; cargo security; physical distribution security; transportation security; cargo theft; Quantitative Risk Assessment;

    Sammanfattning : The objective of this study is to understand what factors influence the security of physical distribution networks. Thereafter it aims to bring to light what security measures exist today to enhance security and finally how to determine the profitability of security investments. LÄS MER