Sökning: "ANC"

Visar resultat 6 - 10 av 52 avhandlingar innehållade ordet ANC.

  1. 6. Active Noise Control of Enclosed Sound Fields Optimising the Performance

    Författare :Per Sjösten; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; optimising actuator and sensor positions; hybrid controller for anc; fast feedforward algorithm; multiple-error algorithm; active noise control; complex lms; multichannel feedforward algorithm; simulated annealing; mean-field annealing; multiple-reference controller;

    Sammanfattning : Active noise control is the art of reducing a primary unwanted sound field by interference with an actively created secondary sound field. To achieve high reduction, it is crucial to obtain both temporal and spatial matching between the primary and the secondary sound fields. LÄS MER

  3. 7. After Apartheid: The Effects of ANC Power and  Religion and HIV: Evidence Using the Expansion of Faith-Based Radio in Uganda

    Författare :Jonas Poulsen; Eva Mörk; Niklas Bengtsson; Andreas Madestam; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Nationalekonomi;

    Sammanfattning : .... LÄS MER

  4. 8. Quality and utilisation of antenatal care services in Lao PDR

    Författare :Chanthanom Manithip; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Background: Antenatal care (ANC) plays an important role in reducing maternal mortality and morbidity by detecting early risk factors in order to have an effective intervention in time and by linking the pregnant women to a planned delivery with a skilled birth attendant. However, the utilisation of ANC services of pregnant women is problematic in many low-income countries, and in Laos only 39% used the services in 2005. LÄS MER

  5. 9. Active Control of Noise in Ventilation Systems : Analysis and Experiments

    Författare :Martin Larsson; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : In many kinds of buildings, the ventilation system constitute a well known source of broadband noise. Traditionally, duct born noise is attenuated using passive resistive silencers which produce a high level of attenuation over a broad frequency range. However, they tend to become large and bulky if designed for low frequency attenuation. LÄS MER

  7. 10. Active Noise Control in Ventilation Systems : Practical Implementation Aspects

    Författare :Martin Larsson; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : In many kinds of buildings, the ventilation is handled by a mechanical ventilation system. Such ventilation systems constitute a well known source of broadband noise. LÄS MER