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Thesis (Ph.D.) - University of Queensland, 2004. / Includes bibliographical references.

International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Many high-performance, reconfigurable data functions can now be integrated into a single PCI circuit board, making possible low-cost and complex systems using PCs or UNIX workstations. FPGA and PCI technologies are an excellent match to telemetry applications where commercial off-the-shelf solutions are desired, but customization is common and performance critical. A Multifunction Telemetry I/O (MFT) module was designed to exploit these technologies for both flight test and space telemetry ground systems. The reconfigurability of the module has facilitated evolutionary hardware enhancements as well as custom applications. These enhancements have been used both as building blocks for system integrators and for commercial-off-the-shelf (COTS) graphic setup, processing, archiving, and display software. The MFT module includes a standard set of telemetry functions: up to two bit synchronizers, an IRIG time decoder, and two independent telemetry serial input and output channels. The MFT module is also available on a 6U VME board. This paper describes some of the proven capabilities and applications of this module.

Diploma thesis deals with the design of a small, computer-controlled machine tool. It is used for gearwheels production and combines the two most used manufacturing methods. The dissertation was dealt with in cooperation with a business subject which focuses on the development of milling machines. The introductory section is discussing research of current state of knowledge and market research focused on gearing machine tools, including patent investigation. The conceptual solution is discussing several variants of the cinematographic arrangement of the axes from which the final design solution was developed. This is described in detail in the second part of the dissertation. It contains description of individual construction complexes, choice of propellant units, modal analysis of sliding systems using the method of finite elements and in the conclusion the electronic part of the machine with its overall shape solution.

Afin de répondre à la demande croissante de nouveaux services, les objets que nous utilisons au quotidien (les smartphones, les voitures, les avions, etc.) tendent à intégrer de plus en plus de systèmes radio tandis que l’espace disponible pour l’intégration de ces éléments est de plus en plus réduit. Ces systèmes radio nécessitent l’utilisation de plusieurs antennes devant répondre à des critères de compacité, d’isolation, de coût, etc. À titre d’illustration, un smartphone contient plusieurs antennes pour assurer des fonctions telles que la téléphonie, la navigation, la connexion à internet par WiFi, les liaisons Bluetooth, la technologie NFC (Near-Field Communications) et ce nombre tend à s’accroitre considérablement avec l’émergence de nouveaux services. Le même phénomène se retrouve également au niveau des plateformes aéroportées où des fonctions telles que la communication, la navigation, le radar, etc. sont utilisées. Cela conduit donc à la nécessité de réduire le nombre d’antennes en regroupant par exemple plusieurs fonctions au sein d’une même et unique antenne. Dans de précédents travaux de recherches, J. Euzière a démontré la possibilité de combiner une fonction radar et une seconde fonction (ici de communication) en utilisant un réseau de 16 monopoles initialement dédié au seul radar, grâce au Time Modulated Array (TMA). De cette façon, les deux fonctions utilisaient la même fréquence et étaient alimentées par une seule source. L’objectif principal de cette thèse est de proposer une solution d’antenne multifonction pour radar et communication encore plus compacte (constituée d’une seule antenne). L’idée est de partir d’une solution antennaire déjà existante et d’y apporter les modifications nécessaires à l’ajout d’une seconde fonction, sans pour autant augmenter la surface de l’antenne ni la complexité du système. / In order to respond to the increasingly demand of new services, the objects we use on a daily basis (such as mobile phones, cars, airplanes etc.), tend to integrate more and more radio systems while the space available is limited. These radio systems require the use of many antennas that must meet multiple requirements such as compactness, isolation, costs, etc. A smart-phone, for example, contains several antennas for global navigation satellite system (GNSS), WiFi, TV, FM radio, Bluetooth, near-field communications (NFC) and the number is expected to increase as new systems are added. Another example is in airborne platforms where multiple functions such as communication, navigation, radar, electronic warfare are used. This leads to the need of reducing the number of associated antennas by regrouping several radio functions into a single antenna. However, combining the functionality of several antennas into one shared radiating element while maintaining the functionality of the various radio systems presents a great challenge. During its Ph.D, J. Euzière demonstrated the possibility to combine a radar function and a secondary function from a 16-monopole array originally dedicated to radar operation by using Time Modulated Array (TMA) technique. By this way, the two functions were operating at the same frequency and the system was powered by a single source.The main objective of this thesis is to propose a more compact antenna (a single antenna) dedicated to radar and communication operations instead of using antenna array as J. Euzière did it. The idea is to start from an existing antenna solution and make the necessary modifications to add a second function without adding additional surface and complexity. As we are interested in radar applications, we will choose a directive antenna: a horn antenna. The goal is then to study the possibility to modify the radiation pattern of the horn antenna through controllable elements (slots) and to transmit a direct modulated signal at the antenna level for the communication function. Furthermore, polarization diversity is an attractive way to increase the isolation between two applications. Thus, this aspect will be taken into account in the design of the antenna solution.

Bibliography: p. 86-93.

Master of Science / Food Science Institute / Elizabeth Boyle / Consumer demand for clean-label and 'all natural' food products has created the need to investigate antimicrobials derived from natural sources. Multifunctional ingredients are food additives that have multiple properties to reduce fat, limit salt, retard oxidation, increase water-holding capacity and inhibit bacterial growth in foods. Multifunctional ingredients that exhibit antimicrobial effects in meat and poultry products can facilitate consumers demand for clean and 'all natural' labels while reducing foodborne illness risk. Previous scientific research has shown that plant essential oils are known to contain active components to prevent oxidation in meat products, but emerging data have shown that these plant-based ingredients also contain antimicrobial properties. Plant essential oils such as basil oil has shown limited Salmonella Enteritidis inhibition in meat model systems and thyme oil has shown Listeria monocytogenes inhibition in low fat beef hotdogs. Intrinsic and extrinsic parameters of meat systems can alter the antimicrobial efficacy of plant essential oils. Although antimicrobial effects were observed with plant essential oils, effective usage levels may be limited to sensory characteristics in certain meat and poultry products. Natural extracts have shown potential antimicrobial properties in meat and poultry applications. Rosemary extract has been shown to suppress the growth of Enterobacteriaceae, Pseudomonas, and yeast and molds in fresh sausage. Grapefruit seed extract has shown inhibition against Campylobacter jejuni in poultry skin and meat models and E. coli O157:H7 in moisture enhanced beef homogenate models. The addition green tea extract in ground beef has been shown to reduce D-values while cooking and inhibit outgrowth of C. perfringens spores during extended chilling of cooked ground beef. Grape seed extract has been shown to reduce Listeria monocytogenes, E. coli O157:H7 and Salmonella Typhimurium populations in cooked lean ground beef stored for 9 days at 4°C. Scientific research findings for plant essential oils and extracts confirm that multifunctional ingredients are relevant to meat and poultry products as potential food additives to control undesirable pathogen and spoilage bacteria while meeting consumer demand for natural, clean-label ingredients.

Cette thèse est consacrée à la conception et à la mise en œuvre d’un réseau d’antenne multifonction.  Basé sur le concept du Time Modulated Array (TMA), réseau modulé dans le temps et grâce à des switches cette étude montre la possibilité de réaliser un réseau multifonctions. Deux fonctions ont été étudiés, une fonction radar (fonction principale) et une fonction communication (fonction secondaire). Une des innovations apportées par ce principe est la bidirectionnalité (chaque fonction est réalisée dans une direction différente) et l’aspect simultané des fonctions exécutées. . La technique conventionnelle du TMA présente aussi des inconvénients pour être utiliser dans des applications radar.  En effet, les variations de directivité, l'angle d'ouverture ainsi qu’une grande sensibilité aux interférences font que le TMA n’est pas compatible avec des applications radar. En effet, une variation de directivité provoque une variation de puissances à l'émission donc les signaux réfléchis souffriront également de cette variation qui peut ainsi créer des erreurs de détections. Des variations de l'angle d'ouverture crée une variation de la résolution angulaire du radar dans le temps ce qui perturbe la capacité de discrimination du radar. De plus, le rejet des interférences est aussi nécessaire afin d'éviter d'être aveuglé par un brouilleur ou par les échos parasites pendant notre détection. Pour résoudre ces inconvénients une méthode spécifique appelée Adapted Radar TMA a ainsi été développée. Grâce à une méthode d'optimisation (algorithme génétique) avec des contraintes définis, avec comme variables principale la loi d’excitation des antennes, plusieurs compromis ont été proposés afin de mutualiser et maximiser les performances de chaque partie (radar et communication). Ainsi 3 méthodes de loi d'excitation des antennes (ou pondération) ont été pensés. Par le biais de ces méthodes, la directivité et l'angle d'ouverture ont été contrôlés. Le rejet des interférences est désormais possible dans une direction donné. De plus, le réseau multifonction est aussi capable de fournir une partie communication ajouté à la partie radar déjà existante. L'optimisation exploite le comportement instantané d'ARTMA. Ainsi, en utilisant la variation des lobes secondaires dus aux changements des poids dans le temps, plusieurs modulations peuvent être adressées, à savoir une modulation ASK ou QAM. Un prototype de ce réseau multifonction comportant 16 antennes a été conçu. Les résultats des mesures ont fourni de bons résultats et ont validé le concept d'une communication en utilisant une modulation d'amplitude et de phase en faisant varier les lobes secondaires dans le temps grâce à des switchs en amont des antennes. / This thesis is devoted to the design and implementation of a multifunctional antenna array. Based on the concept of Time Modulated Array (TMA), array modulated in time with switches this study shows the possibility of a multifunction array. Two functions were studied, a radar function (main function) and a communication function (secondary function). One of the innovations of this principle is the bidirectional (each function is performed in a different direction) and the simultaneous appearance of the functions performed. The conventional technique of TMA also has drawbacks to be used in radar applications. Indeed, variations of directivity, beamwidth and a sensitivity to interference make the TMA no compatible with radar applications. Indeed, a directivity variation causes variations in the power transmission therefore the reflected signals also suffer from these variations, which can thus create errors detections. Variations in the beamwidth creates a change in the angular resolution of the radar in time thereby interfering with the discrimination ability of the radar. In addition, the interference rejection is also needed to avoid being blinded by a jammer or clutter during our detection. To overcome these drawbacks a specific method called Adapted Radar TMA has been developed. Through an optimization method (genetic algorithm) with defined constraints using as main variable the excitation law of the antennas, several compromises were proposed in order to make matched and maximize the performance of each part (radar and communication). Thus methods 3 excitation law of the antennas (weighting coefficients) were thought. Through these methods, the directivity and the beamwidth have been controlled. The interference rejection is now possible in a given direction. In addition, the multifunction array is also capable of providing a communication part added to the existing part radar. Optimization operates with ARTMA instant behavior. Thus, using the variation of the sidelobes due to changes in weighting coefficients over the time, several modulations may be addressed, namely ASK or QAM. A prototype of this multifunction network with 16 antennas was designed. Measurement results have provided good results and have validated the concept of communication using an amplitude and phase modulation by varying the side lobes in time through the switches before of the antennas.

Master´s thesis deal with the supporting steel structure of multi-storey multifunction center in Opava. The complex consists of three sub-objects of three and five storeys with a total floor plan dimensions 48 m × 82.27 m. Five-floor building is designed with ground plan dimensions 42 m × 30 m with the distance of the poles 6.0 m x 6.0 m. The median three-storey building is designed with ground plan measuring 42 meters x 22.27 meters to the distance of the poles 6m x 5m. Ultra three-storey building is designed with ground plan dimensions 42 m × 30 m with the distance of the poles 6m x 6m. Construction of the complex height is 5m.