Sökning: "Sound pressure level"

Visar resultat 21 - 25 av 53 avhandlingar innehållade orden Sound pressure level.

1. 21. Binaural technology and issues related to sound quality analysis and spatial hearing

   Författare :Donatas Trapenskas; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk akustik; Engineering Acoustics;

   Sammanfattning : Binaural technology makes it possible to record, store and reproduce sound field in a perceptually authentic way, i.e. recorded sounds are correctly reproduced so that it is as if the listener was present in the recorded environment. This method involves recording and correctly reproducing sound pressures at each of the eardrums of the listener. LÄS MER

3. 22. Interaction of sound waves with a swirl stabilized wood powder flame and their effects on flame characteristics

   Författare :Burak Göktepe; Henrik Wiinnika; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Engineering; Energiteknik;

   Sammanfattning : Swirling flows have been widely used for many years in engineering applications such as; chemical and mechanical mixing devices, separation units, spray drying technologies, turbo machinery and combustion systems. In practical combustion applications, swirl motion has been adopted to the incoming reactant flows in order to enhance the mixing of fuel and oxidizer and to improve flame stabilization and establishment, especially in regions of relatively low velocities, by recirculating hot product gas to the incoming reactants. LÄS MER

4. 23. Hair cell and organ of corti responses to normal and intense acoustic stimulation

   Författare :Anders Fridberger; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Cochlea; outer hair cells; calcium; pressure changes; micromechanics; noise-induced hearing loss; fluorescent indicators; laser interferometry; temporal bone preparation; guinea pig;

   Sammanfattning : The principal aims of the studies described in this thesis were to develop an in vitro model for studying acoustic overstimulation at the cellular level, to define the electrical and mechanical response characteristics of the perfused temporal bone preparation, and to investigate the effects of intense sound stimulation on the calcium levels of the hair cells in the intact hearing organ. In the in vitro model for acoustic overstimulation, isolated cochlear outer hair cells were subjected to a pressure jet emanating from a glass micropipette aimed at the cell body. LÄS MER

5. 24. Transmission loss of vehicle seals

   Författare :Qi Li; Leping Feng; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vehicle seals; reverberation room test; contact analysis; simple model; mass law; FEM analysis; distorted circular duct model; Acoustics; Akustik;

   Sammanfattning : Sound transmission loss of vehicle seals was studied in this thesis. Reverberation room test and semi-anechoic chamber test were respectively studied. LÄS MER

7. 25. Perspectives on wanted and unwanted sounds in outdoor environments : Studies of masking, stress recovery, and speech intelligibility

   Författare :Jesper J. Alvarsson; Mats E. Nilsson; Stefan Wiens; Staffan Hygge; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Psychology; psykologi;

   Sammanfattning : An acoustic environment contains sounds from various sound sources, some generally perceived as wanted, others as unwanted. This thesis examines the effects of wanted and unwanted sounds in acoustic environments, with regard to masking, stress recovery, and speech intelligibility. LÄS MER