Academic literature on the topic 'GTEM'

Orientador: Luiz Carlos Kretly<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-19T12:48:04Z (GMT). No. of bitstreams: 1 Araujo_HumbertoXavierde_D.pdf: 7050651 bytes, checksum: 1d22c38822d1b7ff3ee74974b2d874b9 (MD5) Previous issue date: 2012<br>Resumo: Este trabalho apresenta a análise detalhada, simulações numéricas completas e os procedimentos para o projeto e a implementação de uma câmara GTEM -GigaHertz Transverse Electromagnetic- para análise de pré-conformidade em circuitos e sistemas eletrônicos. O sistema construído é capaz de realizar testes de EMC - Electromagnetic Compatibility, tanto de interferência - EMI quanto de susceptibilidade - EMS, na faixa de freqüência de 500 MHz - 18 GHz. O projeto apresenta uma inovação ao introduzir estruturas metamateriais na câmara tornando-a mais flexível na determinação da freqüência e níveis de RF e Microondas de teste. Os detalhes do projeto, simulações, a tecnologia de fabricação e medidas de validação da GTEM são descritos neste trabalho<br>Abstract: In this work it is shown a detailed analysis, complete numerical simulations and the guidelines for the design and fabrication of a GTEM - GigaHertz Transverse Electromagnetic chamber, for pre-compliance tests of integrated circuits and electronic boards. With the built structure electromagnetic tests - EMC, including electromagnetic interference - EMI and immunity becomes feasible, on 500 MHz - 18 GHz frequency range. Besides that, an innovative concept is shown with the use of metamaterial technology applied to the GTEM chamber in order to make it more flexible in terms of frequency range. The design, simulation and fabrication strategy are clearly described along throughout this work<br>Doutorado<br>Eletrônica, Microeletrônica e Optoeletrônica<br>Doutor em Engenharia Elétrica

This thesis investigates into possibilities of a design of a workplace for device endurance experiments against strong high-frequency electromagnetic field. It deals with testing methods, describes advantages and disadvantages of such methods. It investigates possibiities of testing devices, possible magnitudes of fieldstrenght. One can find in the thesis a review of a way of testing using a high-intensity electromagnetic field. A concept of a construction of a stripline including a practical example is a part of the thesis.

This thesis describes the Generative Topographic Mapping (GTM) --- a non-linear latent variable model, intended for modelling continuous, intrinsically low-dimensional probability distributions, embedded in high-dimensional spaces. It can be seen as a non-linear form of principal component analysis or factor analysis. It also provides a principled alternative to the self-organizing map --- a widely established neural network model for unsupervised learning --- resolving many of its associated theoretical problems. An important, potential application of the GTM is visualization of high-dimensional data. Since the GTM is non-linear, the relationship between data and its visual representation may be far from trivial, but a better understanding of this relationship can be gained by computing the so-called magnification factor. In essence, the magnification factor relates the distances between data points, as they appear when visualized, to the actual distances between those data points. There are two principal limitations of the basic GTM model. The computational effort required will grow exponentially with the intrinsic dimensionality of the density model. However, if the intended application is visualization, this will typically not be a problem. The other limitation is the inherent structure of the GTM, which makes it most suitable for modelling moderately curved probability distributions of approximately rectangular shape. When the target distribution is very different to that, theaim of maintaining an `interpretable' structure, suitable for visualizing data, may come in conflict with the aim of providing a good density model. The fact that the GTM is a probabilistic model means that results from probability theory and statistics can be used to address problems such as model complexity. Furthermore, this framework provides solid ground for extending the GTM to wider contexts than that of this thesis.

Dans l’école des Tenants des anciennes traductions, les rNying ma pa-s, on trouve, en plus de la lignée de transmission orale dite longue (ring brgyud bka’ ma), une lignée de transmission courte des trésors (nye brgud gter ma). Par « trésors », on entend des textes qui auraient été cachés par Padmasambhava et ses disciples et qui, au moment où les circonstances l’exigent, sont redécouverts par des religieux prédestinés : les gter ston-s. Ceux-ci sont des milliers mais seuls certains d’entre eux, les cinq rois gter ston-s, font autorité pour authentifier un trésor et son découvreur. Le quatrième d’entre eux, Padma gling pa (1450-1521), naquit au Bhoutan où il œuvra et établit des centres religieux. Il étendit également sa sphère d’influence au Sud du Tibet où il fonda l’un de ses monastères principaux : Lha lung. Après sa mort, sa tradition spirituelle continua de se développer grâce à trois lignées d’incarnations. Bien loin de là, dans l’Ouest de l’Himalaya, la tradition rituelle de ce gter ston est encore aujourd’hui pratiquée dans la Vallée des nuages au Spiti. Jusqu’à présent, l’introduction de cette tradition, si éloignée de son lieu d’origine, reste mystérieuse. La présente étude vise, après avoir évoqué le cadre historique de la Vallée, à reconstituer dans un deuxième temps, grâce à des manuscrits que l’on croyait un temps perdus ainsi qu’à la tradition orale, l’histoire de cette tradition religieuse depuis son introduction jusqu’à nos jours. Dans un troisième temps, ce travail expose les pratiques et le calendrier rituel de la Vallée. Enfin, la dernière partie est consacrée au Rituel des vivants (gSon chog), rituel incontournable des habitants de la Vallée<br>In the school of the Followers of the old translations, the rNying ma pa-s, there is not only the Long lineage of the oral transmission (ring brgyud bka’ ma) but also the Short lineage of the treasures (nye brgyud gter ma). “Tresaures” are texts that were hidden by Padmasambhava and his disciples and discovered by predestined religious figures : the gter ston-s, when the circumstances so require. Those gter ston-s are thousands but only few of them, the five gter ston-s kings are recognized authority who can authentify a treasure and its discoverer. The fourth of them Padma gling pa (1450-1521), was born in Bhutan where he built several important religious complexes. During his life time, he extended his influence to the South of Tibet where he founded one of his main monasteries : Lha lung. After his death, his tradition continued to develop thanks to three incarnation lineages. On the western part of the Himalaya, in the Clouds Valley, in Spiti, the ritual tradition of this gter ston is nowadays still practiced. Until recently, the introduction of this ritual tradition far from its place of origin, remained quite a mystery. After an evocation of the historic context, the present study attempt, secondly, thanks to old manuscripts that were supposed to be lost and thanks to the oral tradition, to redraw the history of this religious tradition from its origin until now. Thirdly, this work exposes the practices and the religous agenda of the Valley. Finally, its last part focus on the Ritual of the living beings (gSon chog) which is a key ritual in the life of the inhabitants of the Valley