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The use of a chemically reactive gas in a closed Stirling cycle /Wolgemuth, Carl H. January 1963 (has links)
No description available.
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Investiga??o de um regenerador totalmente ?ptico sintoniz?vel baseado em fibra altamente n?o-linear e efeito de mistura de quatro ondas / Investigation of an all-optical tunable regenerator device based on FMW and HNLFMiranda, Uriel Ramon Cris?stomo de 26 June 2013 (has links)
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Previous issue date: 2013-06-26 / This study aimed to investigate by means of simulations a tunable device capable of regenerating a NRZ-OOK modulated, 10 Gb/s optical signals in an all-optical way. The principle employed for regenerating was the FWM effect in two stages of DS-HNLF. We evaluated the simulations results by comparing estimated bit error rate at the input and output of the regenerator device. The results suggest that it is possible to regenerate all channels in C-band, for optical systems, using the same device only by adjusting parameters that are settable in commercial optical devices such as optical power and frequency of lasers. There was improvement of at least seven orders of magnitude for any C-band channel with input BER below 10-7. Such results, always using the same optical components, suggest that alloptical tunable regenerators can be constructed experimentally and could replace conventional electrical regenerators. / Este trabalho teve como objetivo investigar por meio de simula??es um dispositivo sintoniz?vel capaz de regenerar sinais ?pticos com modula??o NRZ-OOK de 10 Gb/s de maneira totalmente ?ptica. Como princ?pio para regenera??o empregouse o efeito de mistura de quatro ondas em dois est?gios de fibra altamente-n?olinear. Avaliou-se o resultado das simula??es atrav?s da compara??o de estimativas de taxa de erro de bit entre os sinais de entrada e sa?da do regenerador. Os resultados mostraram que ? poss?vel regenerar canais de toda a banda C para sistemas ?pticos utilizando o mesmo dispositivo, ajustando-se apenas par?metros que s?o configur?veis em dispositivos ?pticos comerciais, como pot?ncia e frequ?ncia de lasers cont?nuos. Observou-se melhora de no m?nimo sete ordens de grandeza para qualquer canal da banda C com BER de entrada abaixo de 10-7. Tais resultados, utilizando-se sempre os mesmos componentes ?pticos, sugerem que regeneradores totalmente ?pticos sintoniz?veis podem ser constru?dos experimentalmente e poderiam substituir regeneradores el?tricos convencionais.
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Modeling a heat regenerator-reactor with temperature dependent gas propertiesKulkarni, Milind S. 22 July 1992 (has links)
This thesis examines the transient response of a packed bed heat
regenerator when heated from an initial uniform bed temperature. Very large
(1700 K) temperature differences were studied as well as the effect of
simultaneous chemical reaction in the gas phase.
First the effects of temperature on physical and transport properties
were studied in detail in the absence of a reaction. Models with compressible
flow were compared with conventional models with constant properties and
incompressible flow. Several measures of the regenerator's response to a step
change in inlet gas temperature were calculated to characterize the spread of
the temperature front. Variances of the spatial derivative of the gas
temperature profile and the time derivative of the product gas temperature
were used to evaluate thermal efficiency.
The effects of an exothermic homogeneous gas phase reaction in the
regenerator process were also studied. Several simple kinetic schemes and inlet
conditions were simulated and the profiles of reaction rate and conversion as
well as temperature were analyzed. / Graduation date: 1993
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Návrh regeneračního rotačního ohříváku / Design of rotary regeneratorRiger, Rostislav January 2021 (has links)
This thesis deals with regenerative heat exchangers and their operational issues. The theoretical part explains rotary and fixed bed regenerators. Further it includes the most common issues we encounter in operation. Practical part presents a design of rotary regenerator which cools flue gas from wood chip boiler. Calculation contains stechiometry of flue gas and air, design of rotor, calculation of outlet temperatures, strength calculation, dynamic calculation and design of heat exchanger peripherals.
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