Tesis sobre el tema "Axial and radial growth"
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Gomes, Umesh Prasad. "Catalyst-assisted and catalyst-free growth of III-V semiconductor nanowires". Doctoral thesis, Scuola Normale Superiore, 2017. http://hdl.handle.net/11384/85884.
Texto completoSulistyo, Hary. "Axial and radial heat transport in packed beds". Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293824.
Texto completoSpakovszky, Zoltán S. (Zoltán Sándor) 1972. "Applications of axial and radial compressor dynamic system modeling". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8888.
Texto completoIncludes bibliographical references (p. 255-262).
The presented work is a compilation of four different projects related to axial and centrifugal compression systems. The projects are related by the underlying dynamic system modeling approach that is common in all of them. Two types of models are introduced, suitable for modeling the dynamic behavior of axial and centrifugal compression systems: a compact single semi-actuator disk model, Model I, and a new modular multi semi-actuator disk model, Model II. The first project analyzes aerodynamically induced whirling forces in axial-flow compressors and a new unsteady low order model is introduced to predict the destabilizing whirling forces. The model consists of two parts: compressor Model I with the effect of tip-clearance induced distortion, and an aerodynamically induced force model. The modeling results are compared to experimental data obtained from the GE Aircraft Engines test program on compressor whirl. Previously outstanding whirl-instability issues are resolved, including prediction of the direction and magnitude of rotor whirl-inducing forces; such issues are important in the design of modern axial-flow compressors.
(cont.) Additional insight is gained from the model on the effects of forced rotor whirl. In particular, a non-dimensional parameter is deduced that determines the direction of rotor whirl tendency in both compressors and turbines due to tangential blade loading forces. The second project is a first-of-a-kind feasibility study of an active stall control experiment with a mag- netic bearing servo-actuator in the NASA Glenn high-speed single-stage compressor test facility. Together with CFD and experimental data the tip-clearance sensitive compressor Model I was used in a stochastic estimation and control analysis to determine the required magnetic bearing performance for compressor stall control. A magnetic bearing servo-actuator was designed that fulfilled the performance specifications, setting a milestone in magnetic bearing development for aero-engine applications. Control laws were then developed to stabilize the compressor shaft. In a second control loop, a constant gain controller was imple- mented to stabilize rotating stall. A detailed closed loop simulation at 100% corrected design speed resulted in a 2.3% reduction of stalling mass flow which is comparable to results obtained in the same compressor using unsteady air injection.
(cont.) The third project is the investigation of unsteady impeller-diffuser interaction effects on compressor stability. First, the unsteady blade-row interaction in axial compressors is analyzed using Model II. The results reveal a new signature of pre-stall waves that travel backward, altering the system dynamics when rotor and stator are moderately coupled. The physical mechanism for this behavior is explained from first principles and a coupling criterion is presented. The theory is then applied to centrifugal compressors and in particular to the NASA CC3 high-speed centrifugal compressor, in which experiments are conducted to verify the model predictions. The measurements show the predicted behavior and confirm the existence of backward traveling stall pre-cursors. The fourth project is an experimental demonstration of stability enhancement in the NASA CC3 high-speed centrifugal compressor with air injection. Based ...
by Zoltán Spakovszky.
Ph.D.
Renzetti, Andrew John. "Radial and Axial Designs for Magnetic Absorbent Collector in Water". Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707371/.
Texto completoKneissler, Andreas. "Multisensor-Strategie zur Optimierung des Anwalzverhaltens beim Radial-Axial-Ringwalzen". Aachen Shaker, 2008. http://d-nb.info/993898289/04.
Texto completoGolz, Jan. "Prozesssynchrone Simulation der Temperaturverteilung in radial-axial gewalzten Ringen mit Rechteckquerschnitt". Aachen Shaker, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017047408&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Texto completoKraus, Peter. "Optimierung eines Axial-Radial-ND-Abströmgehäuses hinsichtlich des Wirkungsgrades sowie der Stossoszillation". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965520471.
Texto completoKneißler, Andreas [Verfasser]. "Multisensor-Strategie zur Optimierung des Anwalzverhaltens beim Radial-Axial-Ringwalzen / Andreas Kneißler". Aachen : Shaker, 2009. http://d-nb.info/1126378577/34.
Texto completoFleischer, Erik [Verfasser]. "Entwurf, Modellierung und nichtlineare Regelung eines integrierten Radial-Axial-Magnetlagers / Erik Fleischer". Aachen : Shaker, 2018. http://d-nb.info/1161299262/34.
Texto completoMüller, Lasse. "Adjoint-Based Optimization of Turbomachinery With Applications to Axial and Radial Turbines". Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/280380/5/contratLM.pdf.
Texto completoDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Kraus, Peter. "Optimierung eines Axial-Radial-ND-Abströmgehäuses hinsichtlich des Wirkungsgrades sowie der Stoßoszillation". [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10252242.
Texto completoScharfe, Michelle Kristin. "Electron cross field transport modeling in radial-axial hybrid hall thruster simulations /". May be available electronically:, 2009. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Texto completoGolz, Jan [Verfasser]. "Prozesssynchrone Simulation der Temperaturverteilung in radial-axial gewalzten Ringen mit Rechteckquerschnitt / Jan Golz". Aachen : Shaker, 2008. http://d-nb.info/1161304347/34.
Texto completoBirkenheier, David Andrew. "Non-uniform radial meanline method for off-design performance estimation of multistage axial compressors". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119062.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 111-112).
The increasing use of renewable energy sources necessitates power-generating gas turbines capable of frequently and rapidly starting up to supplement the energy supply when renewable sources alone cannot meet demand [1], [21. This makes the off-design performance of such gas turbines more important as they spend more of their operational life off the design point. Currently off-design performance cannot be estimated with high fidelity until late in the gas turbine compressor design process at which point the design is largely fixed and only limited changes can be made. This thesis presents a Non-Uniform Radial Meanline method for multistage axial compressor off-design performance estimation, capturing the transfer of radial flow non-uniformity and its impact on compressor blade row performance. This method enables the high-fidelity characterization of blade row performance and the stage matching of multistage compressors with non-uniformity effects included. A new representation of non-uniform radial flow profiles using orthonormal basis functions was developed to provide a compact representation suitable for inclusion in a one-dimensional performance estimation method. The link between radial flow non-uniformity and compressor blade row performance was characterized using three-dimensional embedded stage calculations. An initial implementation of the Non-Uniform Radial Meanline method was demonstrated for different compressor inlet non-uniformities. The computations show that the new approach provides an effective means of incorporating radial flow non-uniformity into a one-dimensional compressor performance estimation method.
by David Andrew Birkenheier.
S.M.
Sairam, Kedharnath. "The Influence of Radial Area Variation on Wind Turbines to the Axial Induction Factor". University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367942736.
Texto completoJi, Min. "Fully three-dimensional and viscous semi-inverse method for axial/radial turbomachine blade design". Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Texto completoMichl, Dennis. "Untersuchung des flexiblen axialen Profilierens von nahtlosen Ringen auf Radial-Axial-Ringwalzwerken in Stahl /". Aachen : Shaker, 2009. http://d-nb.info/997891572/04.
Texto completoJabeen, Fauzia. "III-V semiconducting nanowires by molecular beam epitaxy". Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3097.
Texto completoThis thesis is devoted to the study of the growth of III-V nanowires (NWs) by catalyst assisted and catalyst free molecular beam epitaxy (MBE). The nanostructures have been routinely characterized by scanning electron microscopy (SEM) and, to a minor extent by transmission electron microscopy (TEM). X-ray photoemission spectroscopy (XPS), scanning photoemission microscopy (SPEM), extended X-ray absrorption fi ne structure analysis (EXAFS), photoluminescence (PL) and trans- port measurements have given an important contribution on specifi c topics. The first section of this thesis reports on GaAs, InAs, and InGaAs NWs growth by Au assisted MBE. A substrate treatment is proposed that improves uniformity in the NWS morphology. Thanks to a careful statistical analysis of the NWs shape and dimensions as a function of growth temperature and duration, evidence is found of radial growth of the NWs taking place together with the axial growth at the tip. This eff ect is interpreted in term of temperature dependent diff usion length of the cations on the NWs lateral surface. The control of the NWs radial growth allowed to grow core shell InGaAs/GaAs NWs, displaying superior optical quality. A new procedure is proposed to protect NWs surface from air exposure. This procedure allowed to perform ex-situ SPEM studies of electronic properties of the NWs. The second part of this thesis is devoted to Au-free NWs growth. GaAs and InAs NWs were successfully grown for the first time using Mn as catalyst. Incorporation of Mn in the NW is studied using EXAFS technique. It is shown that Mn atoms are incorporated in the body of GaAs NWs. Use of low growth temperature is suggested in order to improve the Mn incorporation inside GaAs NWs and obtain NWs with magnetic properties. Finally, growth of GaAs and InAs NWs on cleaved Si subtrate is demonstrated without the use of any outside metal catalyst. Two kinds of nanowires have been obtained. The experimental findings suggest that the two types of nanowires grow after di fferent growth processes.
Questa tesi e' dedicata allo studio della crescita di nanofili di semiconduttori III- V tramite epitassia da fasci molecolari (MBE) assistita da catalizzatore e senza l'uso di catalizzatori. Le nanostrutture sono state caratterizzate sistematicamente tramite microscopia elettronica a scansione (SEM), e in maniera minore microscopia elettronica in trasmissione (TEM). Altre tecniche come la spettroscopia di fotoemissione da raggi x (XPS), la microscopia da fotoemissione in scansione (SPEM), la spettroscopia di assorbimento x (in particolare la extended X-ray absorpition fine structure analysis (EXAFS)) la fotoluminescenza (PL), e il trasporto elettrico hanno dato importanti contributi su problematiche specifiche. La prima parte di questa tesi riguarda la crescita di nanofili di GaAs, InAs e InGaAs tramite MBE assistita da oro. Viene proposto un trattamento del substrato che migliora nettamente l'omogeneita' morfologica dei nanofili. Grazie ad un'attenta analisi statistica della forma e delle dimensioni dei nanofili in funzione della temperatura e del tempo di crescita e' stata dimostrata la crescita radiale dei nanofili, che avviene insieme alla crescita assiale che ha luogo alla punta del nanofilo. Le osservazioni sperimentali sono state interpretate in termini di dipendenza dalla temperatura della lunghezza di diffusione dei cationi sulle super ci laterali dei nanofili. Il controllo della crescita radiale ha permesso di crescere nanofili di InGaAs/GaAs core shell, costituiti cioe' da una anima centrale di InGaAs (core) e uno strato esterno di GaAs (shell) , che hanno dimostrato eccellente qualita' ottica. Viene quindi proposta una nuova procedura per proteggere la super ficie dei nanofili durante l'esposizione all'aria. Grazie a questa e' stato possibile realizzare ex-situ uno studio SPEM delle proprieta' elettroniche dei nanofili. La seconda parte della tesi riguarda la crescita di nanofili senza l'uso di oro. Viene per la prima volta dimostrata la possibilita' di crescere nanofili di GaAs e InAs usando il manganese come catalizzatore. L'incorporazione del Mn come impurezza nei nanofili e' stata studiata tramite EXAFS. Le misure hanno dimostrato che atomi di Mn sono effettivamente incorporate nel corpo dei nano fili. La crescita delle nanostrutture a temperatura piu' bassa potrebbe migliorare qualitativamente l'incorporazione del Mn e permettere la crescita di nanofili con proprieta' magnetiche. Viene in fine dimostrata la crescita di nanofili di GaAs e di InAs senza l'utilizzo di materiali diversi da quelli costituenti il semiconduttore. Tale risultato e' ottenuto su superfici sfaldate di silicio. Sono state osservate nanostrutture di due tipi, che sulla base dei dati sperimentali sembrano essere dovuti a due diversi meccanismi di crescita.
XXI Ciclo
1977
Swetnam, Thomas W., Marna Ares Thompson y Elaine Kennedy Sutherland. "Using Dendrochronology To Measure Radial Growth of Defoliated Trees". U.S. Department of Agriculture, Forest Service, Cooperative State Research Service, 1985. http://hdl.handle.net/10150/304642.
Texto completoZygmont, Martin. "Reverzační turbokompresor". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229815.
Texto completoSingh, Gursharanjit. "The study of the interactions between a low pressure steam turbine and axial-radial diffuser". Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/15029.
Texto completoMichael, Paul W. y Shreya Mettakadapa. "Bulk Modulus and Traction Effects in an Axial Piston Pump and a Radial Piston Motor". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200173.
Texto completoMichl, Dennis [Verfasser]. "Untersuchung des flexiblen axialen Profilierens von nahtlosen Ringen auf Radial-Axial-Ringwalzwerken in Stahl / Dennis Michl". Aachen : Shaker, 2009. http://d-nb.info/1159836329/34.
Texto completoYilmaz, Kurtulus. "Comparison Of Axial Flux And Radial Flux Brushless Dc Motor Topologies For Control Moment Gyroscope Wheel Applications". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610565/index.pdf.
Texto completoLagao, Patrick [Verfasser]. "Einsatzpotenziale des Data Mining bei der Klassifikation komplexer Fertigungsprozesse am Beispiel des Radial-Axial Ringwalzens / Patrick Lagao". Aachen : Shaker, 2004. http://d-nb.info/1172616353/34.
Texto completoAkiki, Paul. "Conception multi-physique de machines électriques à flux radial et axial pour des applications à entraînement direct". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC055/document.
Texto completoThe work presented in this thesis deals with the modeling and optimization of electrical machines for direct drive applications. The objective is to reduce the use of rare earth permanent magnets along with the improvement of the motor’s efficiency. A state of the art of electrical machines is realized. It focused on radial and axial flow structures for high torque and low speed applications. A classification is established to identify interesting and innovative structures. Firstly, the radial machine is studied. The choice of the structure is made after a finite element comparison of different machines resulting from the literature. This led to an original structure with concentrated winding and multi-V shape barriers. Then, a multi-physics analytical modeling of the structure is detailed in order to calculate the performances with a reduced calculation time. A preliminary design led to the definition of a prototype which was used to experimentally validate the multi-physics model. An optimization design approach is adopted to obtain optimal machines meeting industrial specifications. Secondly, a novel axial flux structure is studied. It is a machine with double rotor and single stator with several barriers per pole. A finite element study is carried out in order to validate the transition from a three dimensional to a two-dimensional model. The analysis of iron losses made it possible to choose the materials used in the stator and the rotors. Then, the development of a multi-physics analytical model for the axial machine is proposed. It is used to optimize the structure according to the same specifications defined for the radial machine. Finally, a comparison between the radial and axial structures is performed in order to evaluate the advantages in terms of torque density
Fekedulegn, Desta. "Spatial and temporal analysis of radial growth in an Appalachian watershed". Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2140.
Texto completoTitle from document title page. Document formatted into pages; contains ix, 270 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 260-270).
Despain, Del Westover. "Radial Growth Relationships in Utah Juniper (Juniperus Osteosperma) and Pinyon Pine (Pinus Edulis)". Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184705.
Texto completoVedera, Kevin G. "An Experimental Methodology for Evaluating Power Losses of Rolling Element Bearings Subjected to Combined Radial and Axial Loads". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1522933829712819.
Texto completoGao, Lushuang, Chunyu Zhang, Xiuhai Zhao y Klaus Gadow. "Gender-Related Climate Response Of Radial Growth In Dioecious Fraxinus Mandshurica Trees". Tree-Ring Society, 2010. http://hdl.handle.net/10150/622620.
Texto completoWalker, David Matthew. "Radial growth response of eastern hemlock to infestation of hemlock woolly adelgid". Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/31920.
Texto completoMaster of Science
Klinka, Karel, Bernhard E. Splechtna, Jaroslav Dobry y Christine Chourmouzis. "Climate - radial growth relationships in some major tree species of British Columbia". Forest Sciences Department, University of British Columbia, 1998. http://hdl.handle.net/2429/671.
Texto completoМарцинковський, Володимир Альбінович, Владимир Альбинович Марцинковский, Volodymyr Albinovych Martsynkovskyi, Вячеслав Ігорович Вороненко, Вячеслав Игоревич Вороненко y Viacheslav Ihorovych Voronenko. "Радіально-осьові коливання ротора з гідроп`ятою". Thesis, Вид-во СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/5915.
Texto completoRosa, Vitor da Silva. "Análise da transferência de calor por convecção em tanques com impulsores mecânicos equipados com chicanas verticais tubulares". reponame:Repositório Institucional da UFABC, 2014.
Buscar texto completoDissertação (mestrado) - Universidade Federal do ABC. Programa de Pós-Graduação em Energia, 2014.
Os tanques com impulsores mecânicos são empregados nas indústrias químicas, petroquímicas, alimentícia, farmacêutica e mineral, como reatores químicos, diluidores, decantadores, misturadores e trocadores de calor. A transmissão de calor em tanques com agitação é realizada através das jaquetas, serpentinas helicoidais, serpentinas em espiral e chicanas tubulares verticais, sendo que existe uma carência de dados na literatura sobre a utilização das chicanas tubulares, em projetos em escala industrial. O presente estudo teve por objetivo principal comparar a transferência de calor e o consumo energético em tanques com impulsores mecânicos, axial e radial, equipados com chicanas tubulares verticais. Como objetivos específicos, o presente estudo visou determinar correlações semi-empíricas para o coeficiente convectivo no escoamento externo, em relação aos impulsores mecânicos utilizados em função dos parâmetros de similaridade Reynolds e Prandtl, e avaliar o efeito do impulsor mecânico sobre a potência consumida e a transmissão de calor. A unidade experimental consistiu, basicamente, de um tanque de acrílico com um volume útil de 50 litros, um impulsor mecânico axial, um impulsor radial tipo turbina, um motor elétrico de 2,5 hp e uma chicana tubular com 4 bancos de tubos de cobre. Os fluidos frios utilizados foram água e solução de sacarose com concentrações de 20% e 50% em massa. O fluido quente utilizado foi água à temperatura constante de 60°C e vazão de 1,2 LPM. Os ensaios foram realizados alternando as rotações na faixa de 90 a 330 RPM e a temperatura de entrada do fluido frio no intervalo de 28°C a 45°C. A potência consumida por ambos os impulsores mecânicos foi determinada a partir da técnica da medição do torque gerado no motor elétrico. O modelo obtido para a previsão do coeficiente externo de convecção, com o impulsor axial apresentou, um desvio médio de 21% e o modelo para o impulsor radial, um desvio médio de 25%. A partir dos modelos obtidos, verificou-se que o impulsor radial incrementa a transmissão de calor em 43% quando comparado com o impulsor axial. A rotação ideal para a maior transmissão de calor, durante o aquecimento das soluções, com o menor consumo de energia foi de 300 rpm. A partir das curvas simultâneas do número de potência e do número de Nusselt, conclui-se que o impulsor axial é o mais indicado para o aquecimento tendo em vista o seu baixo consumo de potência em relação ao impulsor radial.
EThe tanks with mechanical impellers are employed in chemical, petrochemical, food, pharmaceutical and mineral industries, as chemical reactors, thinners, decanters, mixers and heat exchangers. The heat transmission in tanks with agitation is performed through the jackets, helical coils, coils in spiral and vertical tubular baffles, considering that there is a lack of data in the literature on the use of tubular baffles, in industrial scale projects. The present study aimed to compare the main heat transfer and energy consumption in tanks with mechanical axial and radial impellers equipped with tubular vertical baffles. As specific objectives, this study aimed to determine correlations for convective coefficient in the external flow in relation to mechanical impellers used in function of Reynolds and Prandtl similarity parameters, and evaluate the mechanical effect on power consumption and heat transmission. The experimental unit consisted primarily of an acrylic tank with a useful volume of 50 liters, an axial mechanical and turbine type radial impeller, a 2.5 hp electric motor and a tubular chicanery with 4 banks of copper tubes. The cold fluids applied were water, and sucrose solution with concentrations of 20% and 50% by mass. The hot fluid applied was water at constant temperature of 60° C and a 1.2 LPM flow. The tests were carried out in the range of rotations by 90 to 330 RPM and the cold fluid inlet temperature in the range from 28° C to 45° C. The power consumed by both mechanical impellers was determined through the thechnique of measurement of the torque generated at electric motor. The model obtained for external coefficient prediction of convection with the axial impeller presented an average deviation of 21% and the template for the radial impeller, a standard deviation of 25%. From the models obtained, it was found that the radial impeller increases the transmission of heat in 43% when compared with the axial impeller. The ideal rotation for greater heat transfer during heating of the solutions with the lowest energy consumption amounted to 300 rpm. From the number of concurrent power curves and Nusselt number, it is concluded that the axial impeller is the most indicated for heating in view of its low power consumption compared to radial impeller.
Nault, Jason Ray. "Radial distribution of thujaplicins and thujic acid in old growth and second growth western redcedar (Thuja plicata donn)". Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26011.
Texto completoForestry, Faculty of
Graduate
Gardiner, Brooke Bridget Anne. "Molecular changes defining the transition from radial to vertical growth phase in melanoma /". [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19280.pdf.
Texto completoBoone, Rachel, Jacques Tardis y Richard Westwood. "Radial Growth of Oak and Aspen Near a Coal-Fired Station, Manitoba, Canada". Tree-Ring Society, 2004. http://hdl.handle.net/10150/262615.
Texto completoGuevara, Mauricio y Boris Flyash. "SOFT RECOVERY RECORDING SYSTEM FOR INTERIOR AND EXTERIOR BALLISTICS CHARACTERIZATION". International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604266.
Texto completoThe US ARMY, ARDEC; in cooperation with AMCOM AMRDEC, Missile Guidance and Engineering Directorates; the Office of Naval Research; Naval Surface Fire Support; and the Naval Surface Weapon Center, requires multiphase development of a common, low-cost, high G survivable, high accuracy, Micro Electro-Mechanical Systems (MEMS) Inertial Measurement Unit (IMU) and Common, Deeply Integrated, Guidance and Navigation Unit (DI-GNU) for DoD gun launched guided munition and missile applications. The challenge for the Precision Munition Instrumentation Division (PMID) was to develop a Telemetry System to record the interior and exterior ballistics of a M831 TP-T projectile, which will be used as a carrier for soft recovery testing of IMUs and GNUs. This valuable data that would help The Government and contractors develop and validate multiple MEMS IMU design efforts, culminating with live fire verification performance test of pre-production in the Army’s 155-mm Soft Recovery Vehicle (SRVs) and missiles airframes.
Castilho, Guilherme José de 1983. "Determinação experimental das distribuições radial e axial de concentração de solidos em uma seção riser utilizando sonda de fibras opticas". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266221.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: Regimes gás-sólido têm inúmeras aplicações industriais, sendo empregados, por exemplo, em sistemas de transporte pneumático das partículas e em leito fluidizado. Nas últimas duas décadas notou-se a aplicação crescente do leito fluidizado circulante, principalmente para facilidades de geração de energia, como caldeira e reações catalíticas. No processo de craqueamento catalítico fluidizado (FCC), dentre os vários equipamentos que compõem uma unidade conversora, é no riser onde praticamente ocorrem todas as reações de craqueamento. Medidas de grandezas como concentração de sólidos são fundamentais para a compreensão da fluidodinâmica nestes reatores e é pré-requisito para o projeto técnico bem sucedido de sistemas de transporte pneumático. Dentre as várias técnicas utilizadas para medidas de grandezas básicas em sistemas particulados, a sonda de fibra óptica é relativamente simples, de alta precisão e utilizada em várias situações que envolvem o sistema fluido-partícula. Nesta Dissertação, a oncentração volumétrica dos sólidos é medida por meio de uma sonda de fibra óptica. A concentração volumétrica dos sólidos é tomada radialmente e em diversas posições axiais ao longo do riser sob diferentes condições de operação, na Unidade Multipropósito do Laboratório de Processos em Meios Porosos da Faculdade de Engenharia Química da Universidade Estadual de Campinas. Resultados mostram que a concentração volumétrica de sólidos é maior na parede em comparação ao centro do riser, para todas posições axiais, exceto para o ponto mais alto do reator, onde há a influência da região de saída do escoamento. Sobre a distribuição axial de de concentração, verificou-se que o escoamento é mais concentrado na parte inferior do equipamento e tende a ficar menos concentrado ao longo do reator. Através dos espectros de sinais obtidos pela sonda, pôde-se analisar as flutuações através da distribuição de probabilidade dos sinais e da distribuição do desvio padrão do sinal médio. Distribuições de probabilidade permitem identificar a presença de clusters em determinados pontos radiais, revelando que para as condições de mais concentradas, as flutuações são as maiores. As distribuições de desvio padrão apresentam picos, onde sugere maior interação entre as partículas
Abstract: Gas-solid systems have innumerable industrial applications, being used, for example, in the pneumatic conveying of particles and in fluidized bed. In the last two decades it was noticed increasing application of the circulating fluidized bed, mainly for easinesses of energy generation, as boilers and catalytic reactions. In the process of fluidized catalytic cracking (FCC), amongst some equipment that composes a converting unit, it is in riser where the cracking reactions practically occur at all. Measures as solid concentration are basic for the understanding of the fluidodynamic in these reactors and are prerequisite for the successful design of pneumatic transport systems. Amongst the several techniques used for measures in particulates systems, the optical-fiber probe is relatively simple, of high precision and used in some situations that involve fluid-particle system. In this Dissertation, the volumetric concentration of solids is measured by means of an optical-fiber probe. The volumetric concentration of solids is taken radially and in diverse axial positions throughout riser under different operation conditions, in the Multipurpose Unit of the Laboratory of Processes in Porous Means of the College of Chemical Engineering of the State University of Campinas. Results show that the volumetric solid concentration is bigger in the wall in comparison to the center of the riser, for all axial positions, except forthe highest point of the reactor, where it has the influence of the exit region of the flow. On the axial distribution of concentration, it was verified that the flow is more concentrated in the inferior part of the equipment. Through the electrical signs specters gotten by the probe, it could be analyzed the fluctuations through the distribution of probability of the signals and the distribution of the standard deviation of the average signal. The distribution of probability allows identifying the presence of clusters in determined radial points, disclosing that for the most concentrated conditions, the fluctuations are the greater. The distributions of the standard deviation present peaks, where it suggests greater interaction between particles
Mestrado
Engenharia de Processos
Mestre em Engenharia Química
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