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Dissertations / Theses on the topic 'Tumbo'

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Published: 4 June 2021
Last updated: 18 February 2022

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1

Pérez, Zambrano Irina Rachel Diana. "Efecto gastroprotector del zumo del fruto de Passiflora mollisima “tumbo serrano” frente al daño gástrico inducido por etanol en ratas." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2018. https://hdl.handle.net/20.500.12672/7666.

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Determina el efecto gastroprotector del zumo del fruto de Passiflora mollisima “tumbo serrano” frente a daño gástrico inducido por etanol en ratas. Desarrolla un estudio analítico, experimental, transversal y prospectivo. Utiliza 42 ratas Holtzman machos adultos de 2 meses de edad, con peso de 200 g ± 30 g. Se utilizó el zumo del fruto de Passiflora mollisima (tumbo serrano). Las ratas fueron distribuidas aleatoriamente en seis grupos (n=7). Los cuales recibieron tratamientos vía orogástrica, grupo I: suero fisiológico 10 mL/kg peso; grupo II: etanol 96° 1 mL/250g peso; grupo III: sucralfato 30mg/ kg peso; grupo IV: zumo de tumbo serrano 5 mL/kg peso; grupo V: zumo de tumbo serrano 10 mL/kg peso; grupo VI: zumo de tumbo serrano 12 mL/kg peso. Luego de una hora a los grupos IV, V y VI, se les administró etanol 96° 1 mL/250g de peso, para ocasionar daño gástrico. Pasada una hora se procedió a extraer los estómagos para realizar las pruebas morfológicas, de manera macroscópica mediante la escala de Marhuenda y microscópica, analizados histopatológicamente con tinción hematoxilina-eosina. Se evaluó de manera macroscópica las muestras de estómago por medio de la escala de Marhuenda, expresadas en el porcentaje de inhibición por cada grupo. También fueron analizados histopatológicamente para observar los cambios en el tejido. Encuentra que el porcentaje de inhibición en los grupos experimentales de acuerdo a las características valoradas por la escala de Marhuenda, obteniendo al grupo IV, 32.56% de porcentaje de inhibición; grupo V, 55.81% de porcentaje de inhibición y grupo VI, 65.12% de porcentaje de inhibición. En el estudio histopatológico se encontraron zonas ulceradas y se identificó signos de mecanismos de defensa frente a la injuria por etanol como lo fueron, restos de moco, tejido infartado, inflamación de células y edemas. Concluye que el zumo del fruto de Passiflora mollisima “tumbo serrano” tuvo efecto gastroprotector frente a daño gástrico inducido por etanol al 96% en ratas.
Tesis
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2

Córdova-Lavado, Isaac-César. "Estudio de prefactibilidad para la producción de una bebida natural a partir del tumbo andino (Passiflora mollissima) con linaza (Linum usitatissimum)." Bachelor's thesis, Universidad de Lima, 2016. http://repositorio.ulima.edu.pe/handle/ulima/3325.

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El presente trabajo trata sobre el «Estudio de prefactibilidad para la producción de una bebida natural a partir del tumbo andino (Passiflora mollissima) con linaza (Linum usitatissimum)».
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3

Kuno, Aguilar Nataly Karina. "Efecto del secado convectivo sobre el valor nutricional, compuestos bioactivos y capacidad antioxidante en pulpa y semilla de Passiflora tripartita var. mollisima "tumbo serrano"." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2021. https://hdl.handle.net/20.500.12672/16156.

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Evalúa el efecto del secado convectivo (SC) sobre el valor nutricional, compuestos bioactivos y capacidad antioxidante en pulpa y semilla de Passiflora tripartita var. mollisima "tumbo serrano" procedente del sector Pampas (Huancayo). El análisis del valor nutricional es realizado siguiendo los métodos de la A.O.A.C, la determinación de compuestos bioactivos es realizada por espectrofotometría y para evaluar la capacidad antioxidante se utiliza los métodos DPPH y ABTS•+. El secado es realizado en un secador de bandejas a 60°C. Los resultados de los análisis en muestra fresca y seca son (g%): humedad 82,41 y 10,93; cenizas 0,64 y 3,44; fibra cruda 7,39 y 35,13; azúcares reductores directos 5,78 y 13,59; azúcares reductores totales 7,34 y 15,18 (azúcares expresados en g% de glucosa) y vitamina C (mg%) 66,56 y 107,38 respectivamente. En cuanto al análisis de compuestos bioactivos en muestra fresca y seca los resultados son: polifenoles totales 147,16 y 423,02 mg GAE/g, flavonoides 8,67 y 12,99 mg quercetina/100g y carotenos totales 0,28 y 1,09 mg/100g respectivamente. La capacidad antioxidante en muestra fresca y seca mediante el DPPH presenta un IC50 de 11,19 y 31,06 µg/ml y mediante ABTS•+ 7,87 y 13,79 µg/ml comparado con el patrón Trolox respectivamente. Se evidencia disminución significativa en el valor nutricional excepto en fibra y cenizas; compuestos bioactivos y capacidad antioxidante.
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BALDEON, CHAMORRO EDWIN. "Desarrollo de la técnica de lengua electrónica voltamétrica para la determinación de la capacidad antioxidante total de extractos de plantas y frutas peruanas." Doctoral thesis, Editorial Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/54116.

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[EN] In recent years, have increased interest by studying plants species and fruit with nutritional and medicinal properties. The Andean and Amazonian region of Peru is where there are many sources of natural antioxidants. Several methods for the determination of antioxidant compounds including chromatographic or spectrophotometric and other techniques. Although these techniques have disadvantages. Also many analyzes focus in identifying of the compounds generated this capacity and not on the resulting ability. In recent times, it has been proposed the development of electronic sensors called language as a tool to determine the antioxidant activity of plants and fruits. In this thesis has set itself the objective of developing the electronic tongue voltammetric technique for the determination of the total antioxidant activity of plants extracts green tea, aliso, chincilcoma, pachasalvia and inca muña and camu camu and fruits tumbo, goldenberry and kiwifruit. For this purpose has been used a device developed at the University Politecnica Valencia based on pulse voltammetry using as electrodes of noble metal work (Ir, Rh, Pt and Au) and base metals (Ag, Co, Cu and Ni ), applying a pattern of generic pulses between -850 and 950 mV with a pulse width of 20 ms. The results have been able to generate mathematical models predictive of antioxidant activity expressed as Trolox equivalents, of all tested plants. However only have been able generate models for the prediction of fruits camu camu and tumbo is expressed as ascorbic acid equivalents.
[ES] En estos últimos años ha aumentado el interés por descubrir y difundir especies de plantas y variedades de frutas con propiedades nutricionales y medicinales, siendo la región andina y amazónica del Perú un área en la que existen muchas de estas, las cuales, entre otros, son fuentes de antioxidantes naturales. Existen diversos métodos para la determinación de compuestos antioxidantes, siendo los más comunes las técnicas cromatográficas o espectrofotométricas, entre otras. Sin embargo, estas técnicas emplean tratamientos costosos con procedimientos complejos, personal cualificado y normalmente no son adecuados para análisis in situ. Además muchas de ellas centran el análisis en la determinación de uno de los compuestos que generan dicha capacidad y no sobre la propia capacidad resultante. En los últimos tiempos se ha propuesto el desarrollo de sensores llamados lengua electrónica como una herramienta para determinar capacidad antioxidante de plantas y frutas. Así en la presente tesis doctoral se ha planteado el objetivo de desarrollar la técnica de lengua electrónica voltamétrica para la determinación de la capacidad antioxidante de los extractos de las plantas té, aliso, chincilcoma, pachasalvia e inca muña y las frutas camu camu, tumbo, aguaymanto y kiwi. Para ello se ha utilizado un equipo desarrollado en la propia Universidad Politécnica de Valencia basado en la voltametría de pulsos que utiliza como electrodos de trabajo metales nobles (Ir, Rh, Pt y Au) y metales no nobles (Ag, Co, Cu y Ni), aplicando un patrón de pulsos genérico comprendido entre -850 y 950 mV con una amplitud de pulso de 20 ms. Los resultados obtenidos han sido capaces de generar modelos matemáticos de predicción de la capacidad antioxidante, expresada como equivalentes de trolox, de todas las plantas evaluadas. En cambio solo se han podido generar modelos para la predicción de las frutas camu camu y tumbo expresándose esta como equivalentes de ácido ascórbico.
[CAT] Durant a questos últims anys ha augmentat l'interès per descobrir i difondre espècies de plantes i varietats de fruites amb propietats nutricionals i medicinals, sent la regió andina i amazònica del Perú una àrea en la que hi ha moltes d'aquestes, les quals, entre d'altres, són fonts d'antioxidants naturals. Hi ha diversos mètodes per a la determinació de compostos antioxidants, sent els més comuns les tècniques cromatogràfiques o espectrofotomètriques, entre d'altres. No obstant això, aquestes tècniques fan servir tractaments costos amb procediments complexos, personal qualificat i normalment no són adequats per a anàlisi in situ. A més, moltes d'elles centren l'anàlisi en la determinació d'un dels compostos que generen aquesta capacitat i no sobre la pròpia capacitat resultant. En els últims temps s'ha proposat el desenvolupament de sensors anomenats llengua electrònica com una eina per determinar capacitat antioxidant de plantes i fruites. En aquest sentit, en la present tesi doctoral s'ha plantejat l'objectiu de desenvolupar la tècnica de llengua electrònica voltamétrica per a la determinació de la capacitat antioxidant total dels extractes de les plantes té, aliso, chincilcoma, pachasalvia i inca muña i les fruites camu camu, tumbo , aguaymanto i kiwi. Per a tal fi s'ha utilitzat un equip desenvolupat en la pròpia Universitat Politècnica de València basat en la voltametria de polsos que utilitza com elèctrodes de treball metalls nobles (Ir, Rh, Pt i Au) i metalls no nobles (Ag, Co, Cu i Ni ), aplicant un patró de polsos genèric comprès entre -850 i 950 mV amb una amplitud de pols de 20 ms. Els resultats obtinguts han estat capaços de generar models matemàtics de predicció de la capacitat antioxidant, expressada com a equivalents trolox, de totes les plantes avaluades. En canvi només han pogut generar models per a la predicció de les fruites camu camu i tumbo expressant aquesta com a equivalents àcid ascòrbic.
Baldeon Chamorro, E. (2015). Desarrollo de la técnica de lengua electrónica voltamétrica para la determinación de la capacidad antioxidante total de extractos de plantas y frutas peruanas [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/54116
TESIS
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Inocente, Camones Miguel Angel. "Diseño e implementación de una cadena de valor viable y sostenible para productos alimenticios y cosméticos elaborados con extractos estabilizados de Passiflora mollissima L. (tumbo serrano)." Master's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/4197.

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El objetivo del presente estudio es diseñar e implementar un modelo de cadena de valor viable y sostenible para los productos alimenticios y cosméticos elaborados con extractos estabilizados de Passiflora mollissima L. (tumbo serrano). El estudio se desarrolló en tres etapas que representan la sostenibilidad de la cadena. En la primera fase se desarrolló el diseño e implementación de una cadena de valor del tumbo serrano como materia prima; para lo cual se ha realizado el análisis de sus sistemas de producción en el Perú y se ha estructurado una cadena de valor sostenible como materia prima. En la segunda fase se ha realizado la colecta y estabilización de las muestras vegetales, se elaboró y se realizó el análisis fisicoquímico del jugo y extracto estabilizado de tumbo serrano. Se ha elaborado la fórmula maestra, control de calidad y evaluación preclínica de los productos alimenticios (bebida antioxidante y mermelada) y productos cosméticos (crema fotoprotectora y champú antioxidante); asimismo, con los datos obtenidos se ha elaborado las fichas técnicas, analítica y funcional, de los productos alimenticios y cosméticos. En la tercera fase se desarrolló el diseño e implementación de la cadena de valor para los productos alimenticios y cosméticos; para lo cual se ha diseñado el mapeo tecnológico, elaboración de la cadena de valor interna y externa, un plan de marketing, segmentación de mercado, canales de comercialización y principales mercados objetivo, y estrategias de acción para la sostenibilidad socioeconómica de la cadena de valor de los productos derivados del tumbo serrano. Las tres fases del proyecto hacen posible que la cadena de valor generada sea viable y sostenible por el valor agregado que se aporta en cada fase.
Tesis
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6

Churampi, López Lizbeth del Rosario, and Edwards Montes Manrique Erick. "Evaluación de la actividad antiinflamatoria del extracto etanólico del fruto de Passiflora mollissima (Kunth) L.H.Bailey “tumbo serrano” y su uso como activo biológico en industria cosmética." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/4362.

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Passiflora mollissima (Kunth) L.H.Bailey “tumbo serrano” es una planta nativa peruana, utilizada en medicina tradicional por sus beneficios en la salud y valor nutricional. Presenta compuestos polifenólicos principalmente flavonoides; responsables de la capacidad antioxidante y mayoría de propiedades farmacológicas. Los objetivos del presente trabajo: determinar la actividad antiinflamatoria del extracto etanólico del fruto de Passiflora mollissima (Kunth) L.H.Bailey “tumbo serrano” utilizando el modelo experimental: edema auricular inducido por TPA y su uso como activo biológico en la industria cosmética a través de pruebas de seguridad in vitro por el método Irritection Assay System (potencial de irritación dérmica) y el método HET CAM (potencial de irritación ocular). El extracto etanólico al 20% de Passiflora mollissima (Kunth) L.H.Bailey “tumbo serrano” presentaron actividad antiinflamatoria en las dosis de 500 y 1000 µg. En las pruebas de seguridad in vitro, se observó ligero potencial irritante. Conclusiones, en las condiciones experimentales se demostró que el extracto etanólico de Passiflora mollissima (Kunth) L.H.Bailey “tumbo serrano” presentó actividad antiinflamatoria y seguridad como activo biológico en la industria cosmética.
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Taype, Espinoza Evelyng del Rosario. "Estandarización y validación del método HET-CAM para medir la irritabilidad ocular in vitro de los extractos de cinco frutos nativos del Perú utilizados en la industria cosmética." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/4474.

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La presente investigación, provee datos científicos sobre los métodos HET-CAM cualitativo y HET-CAM cuantitativo (CAM-TBS), evaluado en frutos nativos, lo cual puede ser desarrollado profundamente como un método alternativo a la prueba de Draize. El objetivo es estandarizar y validar el método HET-CAM cuantitativo (CAM-TBS) en cinco extractos de frutos nativos del Perú. Los frutos evaluados fueron Physalis peruviana L. (aguaymanto), Myrciaria dubia L. (camu camu), Mauritia flexuosa L. (aguaje), Solanum sessiliflorum D. (cocona) y Passiflora mollisima HBK (tumbo serrano). Estas frutas listadas son comúnmente utilizadas en formulaciones cosméticas. Se prepararon extractos acuosos, hidroalcohólicos y glicólicos. La implementación de la técnica, estandarización y validación, se realizó en el laboratorio de Centro de Investigación de Bioquímica y Nutrición de la Facultad de Medicina Humana de la Universidad de San Martín de Porres (USMP) y en las instalaciones de la empresa privada Ingenioidea SAC, ambas instituciones están localizadas en Lima, Perú. Para la validación del método HET-CAM cuantitativo (CAM-TBS) se evaluaron los parámetros: Linealidad, precisión, exactitud y robustez. Los resultados de estos parámetros se sometieron a pruebas estadísticas demostrando que el método HET-CAM cuantitativo (CAM-TBS) propuesto para la medición de la irritabilidad ocular in vitro es lineal, exacto y preciso pero no robusto.
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Šedý, Jakub. "Turbo konvoluční a turbo blokové kódy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219287.

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The aim is to explain the Turbo convolutional and block turbo codes and decoding the secure message. The practical part focuses on the design of a demonstration program in Matlab. The work is divided into four parts. The first two deal with theoretical analysis of coding and decoding. The third section contains a description created a demonstration program that allows you to navigate the process of encoding and decoding. The fourth is devoted to simulation and performance of turbo codes.
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Fournier, Stéphan. "Turbo codes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22763.pdf.

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Yan, Yun. "Turbo codes." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175200238.

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Raorane, Pooja Prakash. "Sampling Based Turbo and Turbo Concatenated Coded Noncoherent Modulation Schemes." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279071861.

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Abbara, Mamdouh. "Turbo-codes quantiques." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00842327.

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L'idée des turbo-codes, construction très performante permettant l'encodage de l'information classique, ne pouvait jusqu'à présent pas être transposé au problème de l'encodage de l'information quantique. En effet, il subsistait des obstacles tout aussi théoriques que relevant de leur implémentation. A la version quantique connue de ces codes, on ne connaissait ni de résultat établissant une distance minimale infinie, propriété qui autorise de corriger un nombre arbitraire d'erreurs, ni de décodage itératif efficace, car les turbo-encodages quantiques, dits catastrophiques, propagent certaines erreurs lors d'un tel décodage et empêchent son bon fonctionnement. Cette thèse a permis de relever ces deux défis, en établissant des conditions théoriques pour qu'un turbo-code quantique ait une distance minimale infinie, et d'autre part, en exhibant une construction permettant au décodage itératif de bien fonctionner. Les simulations montrent alors que la classe de turbo-codes quantiques conçue est efficace pour transmettre de l'information quantique via un canal dépolarisant dont l'intensité de dépolarisation peut aller jusqu'à p = 0,145. Ces codes quantiques, de rendement constant, peuvent aussi bien être utilisés directement pour encoder de l'information quantique binaire, qu'être intégrés comme modules afin d'améliorer le fonctionnement d'autres codes tels que les LDPC quantiques.
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Barros, Jose da Silva. "Codigos turbo quaternarios." [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259772.

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Orientador: Renato Baldini Filho
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e Computação
Made available in DSpace on 2018-08-03T16:19:21Z (GMT). No. of bitstreams: 1 Barros_JosedaSilva_M.pdf: 832396 bytes, checksum: 7c6800b84777316838807b03162e680f (MD5) Previous issue date: 2003
Mestrado
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Xu, Lei. "OFDM turbo transceivers." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/64480/.

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In this thesis a variety of different techniques designed for the sake of improving the attainable efficiency of wireless system are considered in the context of Orthogonal Frequency Division Multiplexing (OFDM). More explicitly, powerful turbo transceivers invoking Sphere Packing (SP) modulation are designed using EXtrinsic Information Transfer (EXIT) charts for both single-user and multi-user transmission. In order to provide an attractive suite of single-user OFDM transceivers, we contrive a SP-aided OFDM scheme for maximizing the achievable coding advantage. The corresponding capacity equation shows that the SP-OFDM scheme exhibits a higher capacity than its counterpart dispensing with SP. Furthermore, a carefully designed Sphere Packing symbol To Sub-Carrier Mapping (SPTSCM) scheme is contrived, which results in an improved Discrete Input Continuous Output Memoryless Channel (DCMC) capacity. This is achieved by reducing the correlation between the multiple OFDM sub-carriers conveying a specific SP symbol. In order to enhance the attainable BER performance of the SP-OFDM scheme, iterative detection is invoked for exchanging extrinsic information between the SP symbol-to-bit demapper and the channel decoder. In contrast to the classic SP signal construction, sophisticated SP schemes are designed with the aid of EXIT charts for the sake of improving the convergence behaviour of the iteratively detected schemes. Explicitly, an approximately 0.15bit/s/Hz DCMC capacity improvement is achieved and the proposed iterative detection aided SP-OFDM scheme becomes capable of performing within 2.1dB of the maximum achievable rate limit obtained using EXIT charts at BER = 10−4. Some of the proposed advances are then extended to a multi-user Space Division Multiple Access (SDMA) OFDM scheme. Novel turbo MUDs are designed and investigated in terms of their complexity, EXIT characteristics and BER performance. More explicitly, the linear turbo MUDs considered include the Complex-valued Minimum Mean Square Error (SIC-CMMSE) scheme, the Soft Interference Cancellation based Real-valued Minimum Mean Square Error (SIC-RMMSE) arrangement and the Soft Interference Cancellation based Minimum Bit-Error Rate (SIC-MBER) MUD schemes. The SIC-RMMSE is only applicable in the context of BPSK modulated schemes. A Reduced-complexity Minimum Bit-Error Rate (RMBER) is also designed for the sake of arriving at a complexity reduction by slightly compromising the attainable performance in comparison to the SIC-MBER MUD. Furthermore, a hybrid scheme was designed to eliminate the performance degradation imposed by the RMBER MUD. In contrast to above-mentioned linear schemes, Bayesian turbo MUD and the K-best iterative Sphere Decoder (SD) belong to the family of non-linear MUDs. Then a general complexityreduction technique was contrived in order to reduce the complexity imposed by the turbo MUDs, which was referred to as the A-priori-LLR-Threshold (ALT) aided MUD algorithm, which was introduced for the sake of striking an attractive trade-off between the attainable complexity-reduction and the performance degradation imposed. Finally, the novel framework of Transmit Domain Processing based Detectors (TDPD) was contrived for a generalized multi-access or multiplexing based channel model in order to circumvent the exponentially increasing complexity imposed by the Maximum Likelihood (ML) MUD as a function of both the number of antennas and the number of bits per symbol. Explicitly, the TDPD may be separated into three basic steps including the MUD’s Search Center (SC) calculation, detection candidate list generation and LLR output calculation. A range of different schemes were considered for each of the three steps, and the SIC-CMMSE SC aided hybrid K-best subset combination based iterative TDPD was capable of achieving a similar BER performance to the optimal ML detector at a significantly reduced-complexity.
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Pucuhuaranga, Llancari Valeria Liseth, Ramírez Lenibet Pelagia del Pilar Segovia, Martínez Kevin Enrique Andrade, Aniceto Daniel Santiago Alcántara, Núñez Patrick Ghandy García, and Palomino Paolo Giovanni Rojas. "Sistema estructural “tubo en tubo” para edificios altos." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2021. http://hdl.handle.net/20.500.12404/20353.

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El presente trabajo muestra el estudio del comportamiento del sistema estructural Tubo en Tubo y la comparación de este esquema respecto de otros sistemas estructurales para edificios altos. La justificación de la investigación se presentó dada la alta demanda por desarrollar edificaciones verticales con mayores alturas en base a sistemas tubulares capaces de resistir mejor las fuerzas que ejercen el viento y los sismos. Para comprender mejor el funcionamiento de este sistema estructural se analizan casos de estudios teóricos diseñados con códigos sísmicos y de viento de la India. En todos los casos se reconocen los sistemas estructurales empleados y se idealizan tomando en cuenta las principales características, requerimientos y propiedades constructivas y estructurales. Posteriormente, todos los casos se evalúan con una serie de acciones de cargas laterales similares que permiten que los resultados se puedan comparar. La evaluación de estos casos nos permite analizar la eficiencia de cada esquema por medio de los desplazamientos máximos, deformaciones, fuerzas cortantes y estados de daño obtenidos en los análisis.
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Mysore, Naveen. "Combined turbo coding and turbo equalization for wireless systems with antenna diversity." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33983.

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Emerging wireless communication systems strive for very high data rates, increased coverage and good quality of service. To achieve these goals under harsh conditions on many wireless channels (e.g., due to fading, multipath interference, power constraints and bandwidth limitations), both antenna diversity schemes and channel coding should be utilized.
This thesis focuses on achieving reliable transmission over a class of multi-input multi-output Rayleigh faded channels at very low Signal-to-Noise Ratios (SNRs). The transmitter and receiver designs are based on turbo coding, multiple transmit/receive antennas and turbo equalization. Simulation studies were performed for systems with different coding rates, numbers of antennas and interleaving strategies. They show the ability to achieve small bit error rates (10-4--10-5) for negative values of SNR.
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Bundu, Tumba [Verfasser]. "Das Letzte Testament : Woran Sie sich erinnern sollten / Tumba Bundu ; Tumba Bundu." Rodgau : Tumba Bundu, 2021. http://d-nb.info/123645314X/34.

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Konuskan, Cagatay. "Turbo Equalization for HSPA." Thesis, Linköping University, Department of Electrical Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-54640.

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New high quality mobile telecommunication services are offered everyday and the demand for higher data rates is continuously increasing. To maximize the uplink throughput in HSPA when transmission is propagated through a dispersive channel causing self-interference, equalizers are used. One interesting solution, where the equalizer and decoder exchange information in an iterative way, for improving the equalizer performance is Turbo equalization.

In this thesis a literature survey has been performed on Turbo equalization methods and a chosen method has been implemented for the uplink HSPA standard to evaluate the performance in heavily dispersive channels. The selected algorithm has been adapted for multiple receiving antennas, oversampled processing and HARQ retransmissions. The results derived from the computer based link simulations show that the implemented algorithm provide a gain of approximately 0.5 dB when performing up to 7 Turbo equalization iterations. Gains up to 1 dB have been obtained by disabling power control, not using retransmission combining and utilizing a single receiver antenna. The algorithm has also been evaluated considering alternative dispersive channels, Log-MAP decoding, different code rates, number of Turbo equalization iterations and number of Turbo decoding iterations.

The simulation results do not motivate a real implementation of the chosen algorithm considering the increased computational complexity and small gain achieved in a full featured receiver system. Further studies are needed before concluding the HSPA uplink Turbo equalization approach.

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Barros, Jose da Silva. "Codigos turbo hibridos multiniveis." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261099.

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Orientador: Renato Baldini Filho
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e Computação
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Resumo: Neste trabalho apresentamos classes de códigos turbo não binários definidos sobre os campos e anéis de inteiros. Os códigos turbo multiníveis convencionais consistem em dois códigos componentes RSC M-ários, concatenados via um entrelaçador aleatório de N símbolos e com símbolos codificados transmitidos através da modulação M-PSK. Os códigos turbo híbridos multiníveis consistem em dois códigos componentes RSC, não necessariamente definidos sobre o mesmo alfabeto. Os codificadores componentes são separados por um entrelaçador e os símbolos codificados transmitidos através de um esquema híbrido de modulação PSK. O algoritmo de decodificação iterativa de máximo a posteriori, usado para decodificar os códigos concatenados binários, pode ser estendido para a classe dos códigos turbo não binários. Os resultados das simulações mostram que os códigos turbo híbridos multiníveis apresentam melhor desempenho, error floor mais baixo e menor complexidade de codificação e decodificação que os códigos turbo M-ários convencionais. Já os códigos turbo multiníveis M-ários são mais eficientes que os códigos turbo binários padrão
Abstract: This work presents classes of non-binary codes defined over rings and fields of integers. The conventional multilevel turbo codes consist of two M-ary RSC component codes concatenated via a random N-symbol interleaver and with encoded symbols are transmitted using a M-PSK modulation. The hybrid multilevel turbo codes consist of two RSC component codes, defined on different alphabets. The component encoder are separated by a interleaver and the encoder symbols are transmitted utilizing a hybrid M-PSK scheme. The iterative binary decoding algorithm is a maximum a posteriori scheme, which can be extended to the class of the non-binary turbo codes. The results of the simulations show that the hybrid multilevel turbo codes present better performance, lower error floor and lower encoding and decoding complexities than the M-ary conventional turbo codes. Moreover, the M-ary multilevel turbo codes are more efficient than the standard binary turbo codes
Doutorado
Engenharia de Computação
Doutor em Engenharia Elétrica
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20

Ilunga, Lou. "Adaptive, Turbo-coded OFDM." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34578.

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Wireless technologies, such as satellite, cellular, and wireless internet are now commercially driven by ever more demanding consumers, who are ready for seamless integration of communication networks from the home to the car, and into the office. There is a growing need to quickly transmit information wirelessly and accurately. Engineers have already combine techniques such as orthogonal frequency division multiplexing (OFDM) suitable for high data rate transmission with forward error correction (FEC) methods over wireless channels.

In this thesis, we enhance the system throughput of a working OFDM system by adding turbo coding and adaptive modulation (AD). Simulation is done over a time varying, frequency selective Rayleigh fading channel. The temporal variations in the simulated wireless channel are due to the presence of Doppler, a sign of relative motion between transmitter and receiver. The wideband system has 48 data sub-channels, each is individually modulated according to channel state information acquired during the previous burst. The end goal is to increase the system throughput while maintaining system performance under a bit error rate (BER) of 10-2. The results we obtained are preliminary. The lack of resources prevented us from producing detailed graphs of our findings.
Master of Science

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21

Souza, Franco Andrey Silverio de. "Simulação de forçadores de ar pelo metodo tubo-por-tubo." reponame:Repositório Institucional da UFSC, 1995. https://repositorio.ufsc.br/xmlui/handle/123456789/157975.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnologico
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Estudo do programa EVSIM, desenvolvido pelo NiST (National Institute of Standards and Technology - USA) para a simulação de evaporadores do tipo tubo aletado, empregados em condicionadores de ar, visando adequá-lo à simulação de evaporadores de câmara frigoríficas. O modelo apresentado baseia-se, fundamentalmente, no método tubo-por-tubo. A avaliação do desempenho térmico de um tubo aletado, em escoamento cruzado, constitui sua parte básica. A performance total do evaporador é obtida a partir de performance individual de cada tubo, sendo estes associados com os respectivos parâmetros do refrigerante e comum determinado fluxo de ar. Comparações entre resultados fornecidos pelo modelo com valores fornecidos por catálogos de fabricantes e análises comparativas envolvendo as características geométricas do evaporador e os refrigerantes CFC-12, HFC-22 e HFC-134a, são apresentadas e discutidas.
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22

Lee, Kah Ping. "Turbo equalization in wireless communication." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/5844.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 11, 2006) Includes bibliographical references.
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23

Sauvé, Pierre-Paul. "Multibit decoding of turbo codes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0004/MQ40947.pdf.

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Pirestani, Shervin. "Source-controlled block turbo coding." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 69 p, 2008. http://proquest.umi.com/pqdlink?did=994238721&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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25

SILVA, AMANDA CUNHA. "PERFORMANCE ANALYSIS OF TURBO CODES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9445@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Códigos turbo são uma técnica de correção de erro eficiente que vem sendo proposta em diversos padrões de comunicações atuais. Esta técnica apresenta um desempenho que se aproxima dos limites teóricos estabelecidos na Teoria de Codificação. A razão para o excelente desempenho deste tipo de código baseia-se em dois fatores: uma estrutura de codificação composta por codificadores concatenados e uma estrutura de decodificação iterativa. Neste trabalho é realizada uma revisão da literatura onde a decodificação turbo é discutida segundo duas abordagens: uma que baseia-se na estrutura dos codificadores empregados e outra baseada na moderna teoria de grafos- fatores. O desempenho destes códigos é avaliado através de simulações. São considerados fatores como a estrutura dos codificadores, o tipo de modulação empregada, o algoritmo de decodificação utilizado, entre outros.
Turbo codes are an efficient error correcting technique that has been proposed for many communications standards. This technique achieves a performance that is near the theoretical limits established by Information Theory. The reason for this excellent performance of turbo codes relies on two aspects: a coding structure that is composed by concatenated encoders and an iterative decoding procedure. In the literature, two approaches for turbo decoding are presented: one that is based on the encoder structure and another that is built around the factor graphs theory. Both approaches are discussed in this work. Performance evaluation for these codes are obtained through simulations. Some aspects such as encoder structure, modulation scheme and decoding algorithm are considered and evaluated. Also codes derived from turbo codes by puncturing and shortening have been studied in this work.
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26

Said, Fatin. "Turbo coding from OFDM systems." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394250.

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27

Podemski, Robert. "Analyse spectrale des turbo codes." Rennes 1, 1998. http://www.theses.fr/1998REN10150.

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Cette these est dediee aux proprietes spectrales des turbo-codes. Un nouvel algorithme de calcul du spectre des distances de hamming, appele algorithme de la fenetre coulissante, est propose. Cet algorithme est base sur l'algorithme de fano et utilise le concept de suite de retour a zero introduit dans cette these. L'algorithme de la fenetre coulissante tire avantage des proprietes des turbo-codes et, de ce fait, presente une complexite bien inferieure a celle de l'algorithme de fano, permettant ainsi le calcul du spectre des distances pour des turbo-codes utilisant un entrelacement pouvant atteindre 4. 000 bits. La seconde partie de la these donne les regles de construction de turbo-codes, presentant de bons spectres de distance. Les differents criteres que doivent remplir les elements constitutifs du turbo-codeur i. E. Les codes recursifs systematiques, l'entrelacement et le masque de poinconnage de facon a obtenir de bonnes performances sont alors donnes. Les resultats analytique sont verifies par la simulation, aussi bien dans le cas du decodage optimal que non-optimal (iteratif).
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Shukurov, Nadir. "Geometrical Design of Turbo Roundabout." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23336/.

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The Turbo Roundabout is a roundabout fitted with spiral roads to efficiently counteract the complexities of the modern multilane roundabout. This roundabout has an edge over cutting-edge roundabouts regarding capacity and safety and was first invented by Professor Fortujin in 1996. Fast driving speeds and many possible conflicts at multilane roundabout approaches, exits and circulatory roadways are the reasons for this type of construction project. Road designers have been attempting to address these issues over the past few years by implementing new roundabout configurations. Turbo-roundabouts have also spread outside of the Netherlands over the last decade, mainly in Eastern Europe and Germany, but also in North America. While the Dutch model for turbo-roundabout design was strictly applied by some nations, others designed them on experimental sites, resulting in geometrical variations unique to the area. We have more than 390 turbo-roundabouts worldwide today. In this paper, the measurement of sight distance on turbo roundabouts with an emphasis on “Intersection Sight Distance” to conflicting vehicle circulation will be studied. The traditional graphical approach has been supplemented with the analytical solution consisting of derivation of generalized mathematical equations for intersection sight distance for conflicting circulating vehicle at turbo roundabout. To determine the design of turbo roundabout instead of standard type we collected numbers, iterations, flow rate and other information from the intersection in Neapol street - M.Hadi-Ashig Alaskar and Vungtau streets in the capital of Azerbaijan, Baku city. The current name of circle is “Ukraine circle” on behalf of friendship between Azerbaijan and Ukraine. Some of these collected specimens were used to perform the by using the software test at the University of Bologna and in Baku Transportation Agency by PTV VISSIM simulation and AutoCAD Civil.
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Ploštica, Stanislav. "Turbo kódy a jejich aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218201.

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This Diploma thesis aims to explain the data coding using turbo codes. These codes belong to the group of error correction codes. We can reach the high efficiency using these codes. The first part describes process of encoding and decoding. There are describes parts of encoder and decoder. Principle of encoding and decoding demonstrate a simple example. The end of this part contains description of two most frequently used decoding algorithms (SOVA and MAP). The second part contains description of computer program that was made for using as teaching aid. This program was created in Matlab GUI. This program enables to browse error correction process step by step. This program contains graphic interface with many options and display results. In the third part is described program created in Matlab Simulink that was implemented into the TMS320C6713 kit and there is description of measuring procedure. For verification of efficiency of turbo codes was measured any parameters. Some of these parameters are: number of decoding iterations, generating polynoms and using of puncturing. The last part contains measured value and result evaluation.
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Smělý, Martin. "Návrhové prvky turbo-okružních křižovatek." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-355603.

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Dissertation describes new methodology of design turbo-roundabouts in Czech Republic. Especially innovative is approach to the design of traffic lanes with regards to standard vehicles and widening of traffic lanes according to their dimensions. Innovative is also approach to road signs, where details of current signs are modified, however, these details are important for drivers’ better understanding while driving through turbo-roundabouts. Dissertation fills legislative, but also technical, blank spot during turbo-roundabouts design and I believe that it will benefit particularly designers of these intersections.
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Allala, Prathyusha. "Genetic Optimization of Turbo Decoder." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1293681661.

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Tong, Yanhui. "VHDL implementation of turbo codec." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26405.

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Turbo coding is one of the most significant achievements in coding theory during the last decade. It has been shown in the literature that transmission systems employing turbo codes could achieve a performance close to the Shannon limit. Turbo decoding is the major contributor to the overall complexity of turbo coding. Therefore, the challenge is to implement turbo coding in various communications systems at affordable decoding complexity using current VLSI technology. Four different turbo decoding algorithms were investigated in this thesis. Comparisons on both their performances and implementation complexities were performed. Log-MAP based turbo decoding offers the best compromise among the different turbo decoding algorithms. A Register-Transfer-Level (RTL) fixed-point turbo decoder model based on Log-MAP algorithm was designed and simulated using VHDL as the hardware description language. The RTL model was verified by comparing its simulation results with those obtained from a behavioral model of the same turbo decoder written in C language.
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Shaw, Christopher, and Michael Rice. "TURBO-CODED APSK FOR TELEMETRY." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604473.

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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada
This paper considers the use of Amplitude-Phase Shift Keying (APSK) for a telemetry system. Variable rate turbo codes are used to improve the power efficiency of 16- and 32-APSK. We discuss compensation techniques for power amplifier nonlinearities. Simulation results show the improved spectral efficiency of this modulation scheme over those currently defined in telemetry standards.
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34

Rodrigo, Clinton. "Basic Comparison of Three Aircraft Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion." Master's thesis, Aircraft Design and Systems Group (AERO), Department of Automotive and Aeronautical Engineering, Hamburg University of Applied Sciences, 2019. http://d-nb.info/1204558019.

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Purpose - This thesis presents a comparison of aircraft design concepts to identify the superior propulsion system model among turbo-hydraulic, turbo-electric and classic jet propulsion with respect to Direct Operating Costs (DOC), environmental impact and fuel burn. --- Approach - A simple aircraft model was designed based on the Top-Level Aircraft Requirements of the Airbus A320 passenger aircraft, and novel engine concepts were integrated to establish new models. Numerous types of propulsion system configurations were created by varying the type of gas turbine engine and number of propulsors. --- Findings - After an elaborate comparison of the aforementioned concepts, the all turbo-hydraulic propulsion system is found to be superior to the all turbo-electric propulsion system. A new propulsion system concept was developed by combining the thrust of a turbofan engine and utilizing the power produced by the turbo-hydraulic propulsion system that is delivered via propellers. The new partial turbo-hydraulic propulsion concept in which 20% of the total cruise power is coming from the (hydraulic driven) propellers is even more efficient than an all turbo-hydraulic concept in terms of DOC, environmental impact and fuel burn. --- Research Limitations - The aircraft were modelled with a spreadsheet based on handbook methods and relevant statistics. The investigation was done only for one type of reference aircraft and one route. A detailed analysis with a greater number of reference aircraft and types of routes could lead to other results. --- Practical Implications - With the provided spreadsheet, the DOC and environmental impact can be approximated for any commercial reference aircraft combined with the aforementioned propulsion system concepts. --- Social Implications - Based on the results of this thesis, the public will be able to discuss the demerits of otherwise highly lauded electric propulsion concepts. --- Value - To evaluate the viability of the hydraulic propulsion systems for passenger aircraft using simple mass models and aircraft design concept.
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35

Gulmez, Baskoy Ulku. "A Turbo Detection Scheme For Egprs." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1259415/index.pdf.

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Enhanced Data Rates for Global Evolution (EDGE) is one of the 3G wireless communication standards, which provides higher data rates by adopting 8-PSK modulation in TDMA system infrastructure of GSM. In this thesis, a turbo detection receiver for Enhanced General Packet Radio Services (EGPRS) system, which is the packet switching mode of EDGE, is studied. In turbo detection, equalization and channel decoding are performed iteratively. Due to 8-ary alphabet of EGPRS modulation, full state trellis based equalization, as usually performed in GSM, is too complex not only for turbo detection but even for conventional equalization
so suboptimum schemes have to be considered. The Delayed Decision Feedback Sequence Estimation (DDFSE) is chosen as suboptimal and less complex trellis based scheme and it is examined as a conventional equalization technique firstly. It is shown that the DDFSE has a fine tradeoff between performance and complexity and can be a promising candidate for EGPRS. Then it is employed to reduce the number of the trellis state in turbo detection. Max-log-MAP algorithm is used for soft output calculations of both SISO equalizer and SISO decoder. Simulation results illustrate that proposed turbo detection structure improves bit error rate and block error rate performance of the receiver with respect to the conventional equalization and decoding scheme. The iteration gain varies depending on modulation type and coding rate of Modulation Coding Scheme (MCS) employed in EGPRS.
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36

Narayanan, Krishna Rama. "Turbo decoding for packet data systems." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14844.

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37

Sazli, Murat Husnu Işık Can. "Neural network applications to turbo decoding." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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38

Lindblom, Johannes. "Turbo Decoding With Early State Decisions." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11694.

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Turbo codes was first presented in 1993 by C. Berrou, A. Glavieux and P. Thitimajshima. Since then this class of error correcting codes has become one of the most popular, because of its good properties. The turbo codes are able to come very close to theoretical limit, the Shannon limit. Turbo codes are for example used in the third generation of mobile phone (3G) and in the standard IEEE 802.16 (WiMAX).

There are some drawbacks with the algorithm for decoding turbo codes. The deocoder uses a Maximum A Posteriori (MAP) algorithm, which is a complex algorith. Because of the use of many variables in the decoder the decoding circuit will consume a lot of power due to memory accesses and internal communication. One way in which this can be reduced is to make early decisions.

In this work I have focused on making early decision of the encoder states. One major part of the work was also to be sure that the expressions were written in a way that as few variables as possible are needed. A termination condition is also introduced. Simulations based on estimations of the number of memory accesses, shows that the number of memory accesses will significantly decrease.

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Osseiran, Afif Hani. "Sur le décodage des codes turbo." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0028/MQ49797.pdf.

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40

Lajnef, Khaled. "Étude des performances des codes turbo." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65584.pdf.

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41

Tanriover, Cagri C. "Improved turbo codes for data transmission." Thesis, Lancaster University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288960.

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42

Shah, Chintan P. "Turbo-based recievers for underwater communications." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531757.

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43

Von, Backstrom Theodor W. "From turbo-machines to solar chimneys." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71762.

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Thesis (PhD)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: This dissertation is basically a summary, with some interpretation, of published research by the author. The scope is limited to the fields of turbo-machinery, computational fluid dynamics and solar chimney power plants. The main contribution in the field of turbo-machinery in general is in the development of a through-flow method that automatically satisfies mass conservation. Concerning fan design, the contributions are the realization of the importance of the exit kinetic energy in the determination of the efficiency of rotor-only axial flow fans, and the quantification of the effect of off-axis inflow into cooling system fans on their performance. In the field of centrifugal fans and compressors an original, unifying model for the prediction of slip factor was developed. To investigate accident scenarios in closed cycle gas turbine nuclear reactors, all possible operational modes of multi-stage axial compressor operation caused by flow and rotation direction were investigated experimentally and computationally. Spanning the fields of turbo-machinery and solar chimneys, the basic theory of solar chimney turbines was developed, showing that high turbine efficiency was possible. In the field of solar chimneys, an original thermodynamic approach was developed to predict the main relationships that govern solar chimney performance, and to solve the through-flow equations for non-ideal systems with losses. Equations for the accurate determination of all the thermodynamic variables in a solar chimney as dependent on chimney height, wall friction, additional losses, internal drag and area change were derived and solved. Coefficients of wall friction, bracing wheel loss and exit kinetic energy were determined experimentally, and empirical equations were developed to predict the loss coefficient of the collector to turbine transition section and and the turbine inlet flow angle. A simple power law approach allowed the calculation of the optimal turbine pressure drop in solar chimney power plants. A comparison of two sets of equations used to calculate the heat fluxes into, inside and leaving the solar collector, resulted in similar air temperature rises in the collector, and similar produced power. It turned out however that the optimal flow for minimal turbine pressure drop was dependent on the heat transfer models. Investigation of the performance of various solar chimney turbo-generator layouts using analytical models and optimisation techniques showed that the optimal number of turbines varies with plant size, but the individual turbine size, the number of blades and even the efficiency remains close to constant. It was found that the cost of a turbogenerator system, however, varies significantly with size. A joint paper with several German universities and institutions did a comparative cost analysis of solar chimney power plants
AFRIKAANSE OPSOMMING: Hierdie verhandeling is basies ’n opsomming, met interpretasie, van gepubliseerde navorsing deur die outeur. Die omvang is beperk tot die gebiede van turbomasjinerie, berekeningsvloeidinamika en sonskoorsteenkragstasies. Die hoof bydrae op die gebied van turbomasjinerie in die algemeen is in die ontwikkeling van ’n deurvloeimetode wat outomaties massabehoud bevredig. Wat waaierontwerp betref is die bydrae die besef van die belangrikheid van die uitlaat kinetiese energie in die bepaling van waaierbenuttingsgraad, en die kwantifisering van die effek van af-as invloei in verkoelingswaaiers op hulle gedrag. Op die gebied van sentrifugaalwaaiers en -kompressors is ’n oorspronklike, samevattende model vir die voorspelling van glipfaktor ontwikkel. Om ongeluk-scenario’s in geslote kringloop gasturbine kenreaktors te ondersoek is al die moontlike werksmodusse veroorsaak deur vloei en rotasie rigting van ’n multistadium aksiaalkompressor eksperimenteel en numeries ondersoek. As brug tussen turbomasjinerie en sonskoorstene is die basiese teorie van sonskoorsteenturbines ontwikkel met die aanduiding dat hoë turbine benuttingsgraad moontlik is. Op die gebied van sonskoorstene is ’n oorspronklike termodinamies benadering ontwikkel om die hoofverwantskappe te voorspel wat sonskoorsteen gedrag bepaal, en om die deurvloei vergelykings op te los vir nie-ideale stelsels met verliese. Vergelykings vir die akkurate bepaling van al die termodinamiese veranderlikes in ’n sonskoorsteen soos afhanklik van skoorsteenhoogte, wandwrywing, bykomstige verliese, interne sleur en oppervlakte verandering is afgelei en opgelos. Koëffisiënte vir wandwrywing, verstywingswiel-verlies en uitlaat kinetiese energie is eksperimenteel bepaal, en empiriese vergelykings is ontwikkel om die verlieskoëffisiënt van die kollektor-tot-skoorsteen oorgang en die turbine inlaatvloeihoek te bepaal. ’n Eenvoudige magswet benadering het dit mootlik gemaak om die optimum turbine-drukval in sonskoorsteen aanlegte te bepaal. ’n Verglyking van twee stelle vergelykings om warmtevloede in, binne en uit die sonkollektor te bereken het gelei na soortgelyke temperatuurstygings en gelewerde drywing. Die optimale vloei vir maksimum drywing was egter afhanklik van die warmteoordrag modelle. Ondersoek van die gedrag van verskeie turbo-generator uitlegte, deur gebruik van analitiese modelle en optimeringstegnieke het getoon dat die optimale aantal turbines wissel met aanleg grootte, maar die individuele turbine grootte, die aantal lemme en selfs die benuttingsgraad bly feitlik konstant. Daar is egter gevind dat die koste van ’n turbogenerator stelsel beduidend wissel met grootte. ’n Gesamentlike artikel met verskeie Duitse universiteite en instansies het ’n vergelykende koste analise van sonskoorstene gedoen.
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44

Hebbes, Luke. "Turbo codes for real-time applications." Thesis, Kingston University, 2004. http://eprints.kingston.ac.uk/20726/.

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45

Kurkoski, Brian M. "Algorithms and schedules for turbo equalization /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3137222.

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46

Souvignier, Thomas Victor. "Turbo decoding for partial response channels /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9938584.

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47

Hinton, Danielle A. (Danielle Ayodele) 1978. "Turbo coding in correlated fading channels." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87214.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
Includes bibliographical references (leaves 46-47).
by Danielle A. Hinton.
M.Eng.
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48

Nordlöf, Anon, and John Lundqvist. "Turbo Heat Transfer Modeling for Control." Thesis, Linköpings universitet, Fordonssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150352.

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The demand for lower emission engines forces the car industry to build moreefficient engines. Turbocharged engines are on the rise, and better understandingof the heat transfer and efficiency of the turbocharger is needed to build better ones. A lot is known about the overall efficiency of the turbocharger, but not much is known about where the heat losses are located and how they interact with each other. This thesis presents a one dimensional model for heat exchange in the tur-bocharger and investigates how the heat flows from the hot exhaust gases to the cold intake air. Data is gathered by performing tests on a single scroll turbocharger in an engine test bench at Linköping University. The tests are focused on operating points where the air mass flow is low and neither the compressor nor the turbine works adiabatically. The results show that it is possible to estimate the heat flows together withthe efficiency of the turbine and compressor using only known parameters, elim-inating the need to add any new sensors to the engine.
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49

Jar, e. Silva Marcel. "Projeto de entrelaçadores para códigos turbo." Universidade Federal de Pernambuco, 2006. https://repositorio.ufpe.br/handle/123456789/5871.

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Made available in DSpace on 2014-06-12T17:42:14Z (GMT). No. of bitstreams: 2 arquivo6945_1.pdf: 934856 bytes, checksum: 6dde6929102773555ee9224146f061b8 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2006
Os entrelaçadores possuem um papel crucial para que os códigos turbo atinjam desempenho próximo da capacidade do canal. Apesar de terem sido introduzidos primeiramente como simples permutações aleatórias, atualmente existem várias classes de entrelaçadores, tais como, S-aleatórios, DRP, polinomiais e quasi-cíclicos, que produzem melhor desempenho para códigos turbo em um canal AWGN e/ou são mais simples de serem armazenados. Este trabalho tem dois objetivos principais. O primeiro é fazer estudos comparativos entre classes de entrelaçadores que apresentam a propriedade da economia de memória em relação aos entrelaçadores aleatórios. Este estudo visa suprir uma lacuna na literatura, que normalmente compara novas classes de entrelaçadores com a classe dos entrelaçadores S-aleatórios. O segundo objetivo é o desenvolvimento de uma nova classe de entrelaçadores que também apresenta a característica da economia de memória, além de garantir altos fatores de espalhamento. Os entrelaçadores pertencentes a esta classe são batizados como entrelaçadores quasi-retangulares
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50

Faudeil, Stéphane. "Les turbo-codes à haut débit." Brest, 1994. http://www.theses.fr/1994BRES2019.

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Les turbo-codes constituent une nouvelle classe de codes correcteurs d'erreurs elaboree a partir d'une concatenation parallele de 2 codes convolutifs systematiques recursifs a faible nombre d'etats separes par un entrelaceur. Leur decodage, realise sous forme iterative, conduit a des performances superieures a celles de tout autre code correcteur. Le processus iteratif se traduit en pratique par une structure modulaire de decodage. Le module etant d'une complexite limitee, les problemes de dissipation aux hautes frequences sont evacues. Les turbo-codes semblent donc etre bien adaptes aux applications a haut debit (> 150 moits/s). Le travail de these a porte sur l'etude d'architectures paralleles permettant d'atteindre ces debits eleves. Le temps d'acces des memoires ram utilisees dans les entrelaceurs limite la frequence de fonctionnement du turbo-codeur/decodeur. Un entrelacement parallele, de performances identiques a celles de l'entrelaceur classique, a ete imagine, pour en diminuer artificiellement les temps critiques. Une seconde contrainte temporelle apparait dans les deux decodeurs de viterbi a decisions ponderees presents dans le module. Trois solutions sont proposees: l'utilisation de l'arithmetique carry save dans les processeurs acs (add compare select), le traitement de deux etapes de treillis en une seule recursion des processeurs acs, le decodage de facon concurrente de 2 ou 3 sequences independantes et alternees. Une comparaison de performances (complexite, vitesse et dissipation) permet de degager la seconde solution comme etant la plus appropriee. Pour un debit de transmission de 150 moits/s, sur la base d'une technologie cmos 0. 6 , la puissance dissipee par le module est de 2. 2 w, et la surface occupee (cur du circuit) est de 30 mm#2
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