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Malgré les progrès accomplis dans la réduction du bruit des ventilateurs axiaux subsoniques, le bruit de raie basse fréquence, composante gênante du bruit, demeure difficile à contrôler. Aux basses fréquences, l'ajout de matériaux absorbants est inefficace et les silencieux encombrants et coûteux. Il faut alors faire appel à des "mesures curatives", comme le contrôle actif acoustique ou le contrôle actif à la source. Les contributions de ces travaux de doctorat sont : 1) l'estimation des sources aéroacoustiques du bruit de raie par modèle inverse, 2) une méthode de contrôle actif nécessitant un seul haut-parleur et 3) une méthode de contrôle passif adaptatif basée sur l'ajout d'obstructions dans l'écoulement. Les développements théoriques menés dans cette thèse sont valides pour les ventilateurs axiaux subsoniques et les expériences ont été réalisées sur un ventilateur de radiateur d'automobile.

This thesis focuses on defining concepts of creativity and innovation in business context. It analyzes methods which may lead to enhancement of creativity in order to increase value of business for customer as well as to develop the business itself. This work also includes real application of selected methods on management of cafe Dobra zastavka in Brno, Czech Republic.

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This research focusses on crime prevention on farms with Transvaal Sugar Limited as a selected study. The printed media, quantitative and qualitative research principles were used to gather data and to determine to what extend crime is experienced by the respondents. The primary aim of the quantitative research principles is to investigate the nature and extent of crime on the company`s agricultural sites. Existing crime prevention measures on the different agricultural sites are also evaluated and recommendations made where necessary. Interviews with various respondents brought to the fore interesting opinions related to crime based on the empirical-phenomenological method. The support farmers received from the SAPS is discussed in full. The value of the primary physical barriers or obstructions with regard to crime prevention were emphasised in this study. Without the support of conventional electronics, together with the inputs of the human factor, physical crime prevention measures will be of little value, especially on geographical far reached agricultural estates. Farm attacks as a separate phenomenon is part of this study and serves as a comprehensive discussion regarding media reports and previous research on this subject. The ADSC crime prevention model is developed as a result of this study with the aim of contributing to the prevention of crime on farms. Good interpersonal and loyal attitudes are identified as key factors on which the farmers must concentrate in order to prevent crime. / Criminology / D. Litt. et Phil.(Criminology)

This research focusses on crime prevention on farms with Transvaal Sugar Limited as a selected study. The printed media, quantitative and qualitative research principles were used to gather data and to determine to what extend crime is experienced by the respondents. The primary aim of the quantitative research principles is to investigate the nature and extent of crime on the company`s agricultural sites. Existing crime prevention measures on the different agricultural sites are also evaluated and recommendations made where necessary. Interviews with various respondents brought to the fore interesting opinions related to crime based on the empirical-phenomenological method. The support farmers received from the SAPS is discussed in full. The value of the primary physical barriers or obstructions with regard to crime prevention were emphasised in this study. Without the support of conventional electronics, together with the inputs of the human factor, physical crime prevention measures will be of little value, especially on geographical far reached agricultural estates. Farm attacks as a separate phenomenon is part of this study and serves as a comprehensive discussion regarding media reports and previous research on this subject. The ADSC crime prevention model is developed as a result of this study with the aim of contributing to the prevention of crime on farms. Good interpersonal and loyal attitudes are identified as key factors on which the farmers must concentrate in order to prevent crime. / Criminology and Security Science / D. Litt. et Phil.(Criminology)