No description available.

No description available.

No description available.

No description available.

This dissertation presents the investigation of antennas with improved performances at microwave frequencies. It covers the following three topics: the study of the metamaterial with near-zero index of refraction and its application in directive antenna design, the design technique of a wideband circularly polarized patch antenna for 60GHz wireless application and the investigation of a novel direction of arrival (DOA) estimation technique inspired by human auditory system. First, the metamaterial composed of two-dimensional (2-D) metallic wire arrays is investigated as an effective medium with an effective index of refraction less than unity (n(eff) < 1). The effective medium parameters (permittivity ε(eff), permeability μ(eff) and n(eff)) of a wire array are extracted from the finite-element simulated scattering parameters and verified through a 2-D electromagnetic band gap (EBG) structure case study. A simple design methodology for directive monopole antennas is introduced by embedding a monopole within a metallic wire array with n(eff) < 1 at the antenna operating frequencies. The narrow beam effect of the monopole antenna is demonstrated in both simulation and experiment at X-band (8 – 12 GHz). The measured antenna properties including return loss and radiation patterns are in good agreement with simulation results. Parametric studies of the antenna system are performed. The physical principles and interpretations of the directive monopole antenna embedded in the wire array medium are also discussed. Second, a fully packaged wideband circularly polarized patch antenna is designed for 60GHz wireless communication. The patch antenna incorporates a diagonal slot at the center and features a superstrate and an air cavity backing to achieve desired performances including wide bandwidth, high efficiency and low axial ratio. The detailed design procedure of the circularly polarized antenna, including the design of the microstrip-fed patch antenna and the comparison of the performances of the antenna with different feeding interfaces, is described. The experimental results of the final packaged antenna agree reasonably with the simulation results. Third, an improved two-antenna direction of arrival (DOA) estimation technique is explored, which is inspired by the human auditory system. The idea of this work is to utilize a lossy scatter, which emulates the low-pass filtering function of the human head at high frequency, to achieve more accurate DOA estimation. A simple 2-monopole example is studied and the multiple signal classification (MUSIC) algorithm is applied to calculate the DOA. The improved estimation accuracy is demonstrated in both simulation and experiment. Furthermore, inspired by the sound localization capability of human using just a single ear, a novel direction of arrival estimation technique using a single UWB antenna is proposed and studied. The DOA estimation accuracies of the single UWB antenna are studied in the x-y, x-z and y-z planes with different Signal to Noise Ratios (SNR). The proposed single antenna DOA technique is demonstrated in both simulation and experiment, although with reduced accuracy comparing with the case of two antennas with a scatter in between. At the end, the conclusions of this dissertation are drawn and possible future works are discussed.

No description available.

In this research, following Mintzberg (1979 a), the structuring mode of these small enterprises, which are the theatrical production compagnies, has been named rudimentary adhocracy. In postulating the essential importance of the product itself in the management of these enterprises, the subject of this research is the praxis of the theatre director while structuring the project by which the theatrical representation happens. / In this research we have identified three types of praxis of directing: the first one is characterized by a search for the effectiveness of dramatic representation, the second one by a search for interiority and the third one by a search for new theatrality and theatralization. The first type, which is related to the > action, is characterized by an objective mode of conception of theatrical imaginary, a proactive mode of elaboration of the product within time and an autocratic mode of control in interpersonal relations. The two other types, which are variants of the > action, are characterized by a subjective mode of conception, a reactive mode of elaboration of the product and an allocratic mode of control. These three types of praxis are manifestations of the personal mode of structuring which we have identified as typical of rudimentary adhocracy. In inverting the title: >, this research leads to the application of the particular case of directing to the general one of management in rudimentary adhocracy. The objects of praxis are seen as being at the same time objects of affection and objects of knowledge, and the praxis of management is reconceptualised in the same way as is praxis of directing, in terms of the affective and cognitive dimensions underlying the manager's vision of the end product, the tight interrelation between that vision and its operationalization, and the influence of the internal and external realities of the manager as much as of the enterprise. This exploratory research has been conducted within an holistic perspective, i.e., considering the praxis of directing as a total fact. Participant observation and guided interview has been used to collect the material upon which the discussion is based.

The following thesis is an examination of audio engineering for television broadcast production. The extensive sound design, implementation, and production of television programming are to be examined from the perspective of four individual productions of diverse genres. A variety of skills necessary to produce each of the programs are discussed in detail.

No abstract available. / Thesis (Ph.D.)-University of Natal, Durban, 1979.

This thesis has explored the relationship between the seven strong characters in The Lion in Winter and the dialogue through which Goldman reveals them. Each character is examined with the use selected sections of the dialogue to support the assertions.The second and third chapters discuss the procedures and evaluation of the production The Lion in Winter in Ball State University's Studio Theatre on February 14-17, 1973. Included in these sections are the director's ideas, problems, solutions, and suggestions.The appendices contain the production book and all the designs which were necessary to produce The Lion in Winter. In addition, photographs of the actual production are included.