Th. doct.-ing.--Nancy, I.N.P.L., 1981.

Th.--Sci. phys.--Nancy--I.N.P.L., 1981.

Th. doct.-ing.--Électrotech.--Toulouse--I.N.P., 1979. N°: 44.

Made available in DSpace on 2014-06-11T19:28:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-12Bitstream added on 2014-06-13T20:37:39Z : No. of bitstreams: 1 carvalho_rf_me_guara.pdf: 1480284 bytes, checksum: c7e8cc63c757c4ed4fc23810d1bdaa7c (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Projetar e construir máquinas de pistões axiais são atividades desenvolvidas por poucas empresas no mundo. No Brasil, não se conhece nenhum projeto sobre este tipo de máquina até agora, isto é, um projeto totalmente nacional, apenas são manufaturadas utilizando mão de obra brasileira. Este tipo de máquina tem grande aplicação na área industrial, móbile e aeronáutica. Desenvolver este trabalho é o grande desafio, tendo em vista conquistar tecnologia sobre este produto e, conseqüentemente, livrar-se da dependência tecnológica de outros países. Sendo assim este trabalho procura ir mais longe, pois pretende substituir diretamente os motores comerciais em funcionamento numa etapa muito próxima e subseqüente. Calcular e desenhar uma máquina não são etapas suficientes para que ela funcione e ocupe lugar no mercado. Portanto, um estudo minucioso sobre como cada peça deveria ser usinada foi elaborado, e posteriormente discutido com operadores de máquinas. Esta etapa precisa ser considerada tão importante quanto necessária. Este trabalho além de apresentar um histórico da evolução da hidrostática, também mostra com figuras o funcionamento dos motores de pistões axiais. Um roteiro de cálculos relata como as dimensões da máquina foram determinadas, com a finalidade de se obter o desenho de conjunto. / Designing and manufacturing axial piston Swashplate machines are activities that few companies have developed around the world. So far, nothing has been known related to this kind of machine when the focus is on a true national design. In addition, Swashplate machines are fully utilized in industrial, mobile and aeronautical area. Developing this work is the challenge, looking forward to conquer technology in order to manufacture such a product and, consequently, be free from paying royalties to other countries. In this way, the present work goes beyond when one intends to directly substitute those commercial machines in a well next time, it means, just after this work has finished. Calculating and drawing are not sufficient steps to have a machine running. So, a well detailed study was set up in order to know how the parts would be machined and treating and discussing with machine operators was necessary. One should remind that this is a step as important as well necessary. This work presents the history of hydrostatic machines and an explanation relating how the Swashplate motor works. Some calculations are also presented in order to have the assembled view drawing of this machine accomplished.

Parallax is a distributed storage system that uses virtualization to provide storage facilities specifically for virtual environments. The system employs a novel archi-tecture in which storage features that have traditionally been implemented directly on high-end storage arrays and switches are relocated into a federation of storage VMs, sharing the same physical hosts as the VMs that they serve. This architecture retains the single administrative domain and OS agnosticism achieved by array- and switch-based approaches, while lowering the bar on hardware requirements and facilitating the development of new features. Parallax offers a comprehensive set of storage features including frequent, low-overhead snapshot of virtual disks, the “gold-mastering” of template images, and the ability to use local disks as a persistent cache to dampen burst demand on networked storage. / Science, Faculty of / Computer Science, Department of / Graduate

An experimental reading machine for the blind has been built to test a proposed multidimensional audible code. This device, patterned after the popular Optophone reader, can generate either the multidimensional code or a simulated version of the Optophone code. The results of tests carried out with two blind subjects show that multidimensionally-encoded letters and words can be learned and "read" with reasonable accuracy, even when entirely different dimensions of the code are utilized. A comparative evaluation of the multidimensional and Optophone codes, based on the performance of 52 sighted persons, suggests that the multidimensional code provides a better basis for letter discrimination. A detailed study of the discrete print signals produced by this machine is presented. The results of this study suggest that this particular print scanning system does not lend itself to automatic letter recognition, but that, with some pre-processing of the print information, some optimization of the audible code can be achieved. It is also demonstrated that the information produced by this machine is highly redundant, and that the discrete nature of the print translation process may psychologically limit the maximum reading speed, regardless of the audible code employed. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

A compact reading machine ("Lexiphone") has been designed and constructed to convert printed letters into a pattern of sounds. The machine reads by direct translation of vertical sections of the letters, according to a recently developed code. In this code, the "melody" produced is independent of the vertical position of the reading head ; however the user is given an indication (mean pitch) of the vertical position to-facilitate tracking along a line of print. The discrete nature of the direct translation process limits the theoretically possible reading rates. Tests with artificially generated codes were performed to investigate this limit, and it is expected that the limit will be above that for Morse Code-- 60 to 70 words per minute. This would be adequate for practical use. Tests performed at Haskins Laboratories predicted similar performance for other machines, such as the optophone⁽⁴⁾. However, practical users of the "Battelle Optophone", the most refined version of the optophone, attained only 25 words per minute (on Grade I reading material) after an extensive course⁽⁸⁾ . It is suggested that this was due to the difficulty in the earlier machines of producing repeatable versions of the code. Code sounds from the present Lexiphone prototype were found to be very consistent and repeatable, and should allow the predicted reading rates to be approached. Practical reading results with the machine are presented. At the time of writing, a subject training with the machine is reading two-page passages of Grade III material at 30 words per minute, and her performance is still improving. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

A two part study was undertaken to explain the performance of cyclones operated in circulating fluidized bed combustion (CFBC) systems. In the first part, collection efficiency tests were performed on a one-ninth scale polyacrylic cyclone model of the industrial scale cyclone at the 22 MWe CFBC facility at Chatham, New Brunswick. Emphasis was placed on scale-up considerations, loading effects, inlet geometry effects, and flow visualization trials. Experiments were performed at room temperature with inlet velocities between 3.7 and 5.5 m/s, solids loading between 0.05 and 7.5 mass solids/mass air with two different solids systems. There was disappointing agreement between the results from the Chatham unit, scaled according to Stokes Number scaling, and the findings obtained from the cold model unit. There was a minimum in the particle collection efficiency for particles of diameter 2.5 to 3.0 µm, apparently associated with agglomeration effects in the cyclone. Particle collection efficiency was found to increase with increased particle loading for the conditions studied. Changes in the inlet geometry gave inconclusive results. The experimental results were limited by problems associated with feeding and recycling the fines solids system used. In the second part radial gas concentration profiles of a secondary cyclone serving the UBC pilot scale Circulating Fluidized Bed Combustor were performed at temperatures of about 870 ℃. Concentrations of O₂ , CO₂ , NO[formula omitted] , CH₄ , CO and SO₂ were measured. An increase in [CO], and to a lesser extent [CO₂], was measured near the cyclone wall. There appeared to be little radial variation in the concentration of other species. Further work is required to allow the cold model to operate continuously, with particles which can be fed more freely, and to obtain radial gas concentration profiles within the primary cyclone of the UBC CFBC system. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

The problem of the study was to determine the effects of student use of Skill-Builder Controlled Reader training in facilitating skill development in beginning and intermediate typewriting classes at the college level.

No description available.