Tesis sobre el tema "Composite and sandwich plate"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores tesis para su investigación sobre el tema "Composite and sandwich plate".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
Martin, James David. "Sandwich Plate System Bridge Deck Tests". Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/31648.
Texto completoMaster of Science
Stephens, Max Taylor. "Numerical and Experimental Analysis of Composite Sandwich Links for the LCF System". PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/579.
Texto completoGlenn, Christopher Edward. "Fabrication and Structural Performance of Random Wetlay Composite Sandwich Panels". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/43208.
Texto completoMaster of Science
Alanbay, Berkan. "Free Vibrations and Static Deformations of Composite Laminates and Sandwich Plates using Ritz Method". Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/103087.
Texto completoDoctor of Philosophy
In everyday life, plate-like structures find applications such as boards displaying advertisements, signs on shops and panels on automobiles. These structures are typically nailed, welded, or glued to supports at one or more edges. When subjected to disturbances such as wind gusts, plate-like structures vibrate. The frequency (number of cycles per second) of a structure in the absence of an applied external load is called its natural frequency that depends upon plate's geometric dimensions, its material and how it is supported at the edges. If the frequency of an applied disturbance matches one of the natural frequencies of the plate, then it will vibrate violently. To avoid such situations in structural designs, it is important to know the natural frequencies of a plate under different support conditions. One would also expect the plate to be able to support the designed structural load without breaking; hence knowledge of plate's deformations and stresses developed in it is equally important. These require mathematical models that adequately characterize their static and dynamic behavior. Most mathematical models are based on plate theories. Although plates are three-dimensional (3D) objects, their thickness is small as compared to the in-plane dimensions. Thus, they are analyzed as 2D objects using assumptions on the displacement fields and using quantities averaged over the plate thickness. These provide many plate theories, each with its own computational efficiency and fidelity (the degree to which it reproduces behavior of the 3-D object). Hence, a plate theory can be developed to provide accurately a quantity of interest. Some issues are more challenging for low-fidelity plate theories than others. For example, the greater the plate thickness, the higher the fidelity of plate theories required for obtaining accurate natural frequencies and deformations. Another challenging issue arises when a sandwich structure consists of strong face-sheets (e.g., made of carbon fiber-reinforced epoxy composite) and a soft core (e.g., made of foam) embedded between them. Sandwich structures exhibit more complex behavior than monolithic plates. Thus, many widely used plate theories may not provide accurate results for them. Here, we have used different plate theories to solve problems including those for sandwich structures. The governing equations of the plate theories are solved numerically (i.e., they are approximately satisfied) using the Ritz method named after Walter Ritz and weighted Jacobi polynomials. It is shown that these provide accurate solutions and the corresponding numerical algorithms are computationally more economical than the commonly used finite element method. To evaluate the accuracy of a plate theory, we have analytically solved (i.e., the governing equations are satisfied at every point in the problem domain) equations of the 3D theory of linear elasticity. The results presented in this research should help structural designers.
Grigg, William Reid. "Post-Injection Welded Joint Fatigue Tests of Sandwich Plate System Panels". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/44900.
Texto completoMaster of Science
Kataoka, Filho Mário. "Optimization of nonhomogeneous facesheets in composite sandwich plates". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27974.pdf.
Texto completoHoang, Minh Phuc. "Homogénéisation analytique de structures de nid d'abeille pour des plaques composites sandwich". Thesis, Reims, 2015. http://www.theses.fr/2015REIMS011/document.
Texto completoThe aim of this thesis is to develop an analytical homogenization model for the honeycomb core sandwich panels. Unlike conventional methods, the skin effects are taken into account, leading to a very different mechanical properties. In the cases of extensions, bendings, in-plane shear, transverse shears andtorsion, different analytical function series are proposed to consider the stress redistribution between the honeycomb walls. We have studied the influence of the height of the core on its homogenized properties. The moduli curves obtained by the present H-models are well bounded by the moduli values obtained by the beam theory. The interface stresses are also studied to compare with existing models for stretching problem. Many numerical computations with our H-models have been done for the problems of stretching, bending, in-plan and transverse shearing, as well as torsion. Very good agreement has been achieved between the results of the H-models and the results obtained by finite element simulations by completely meshing thesandwich panel with shell elements. Our H-models have been applied to the computations of industrial large sandwich panels with honeycomb core. The comparison of the results between the H-models and the simulations with Abaqus shell elements are in very good agreement
Elmushyakhi, Abraham. "In-Plane Fatigue Characterization of Core Joints in Sandwich Composite Structures". University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1510678155755824.
Texto completoHelmstetter, Dennis J. "Analysis procedures for optimizing the core of composite sandwich panels for blast resistance". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 165 p, 2009. http://proquest.umi.com/pqdweb?did=1885754601&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Texto completoSingh, Sonu Shravan Kumar. "Buckling and Wrinkling Analysis of Composite Sandwich Plates Using Finite Element Methods". Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10752150.
Texto completoComposite sandwich plates are widely used in aerospace, automobile and shipbuilding industries. Composite sandwich plates have many different types of failure modes. A comparative study of composite sandwich plates with different finite element modeling approaches for predicting buckling and wrinkling failure response is described in this thesis. The research considers composite sandwich plates with isotropic and anisotropic face-sheets with a thick core. Finite element solutions are obtained using Abaqus/CAE 2016 software by conventional shell element models and conventional shell/solid element models. This study investigates results obtained using finite element methods and compares them to experimental and analytical solutions for overall buckling and face-sheet wrinkling. Results of the study indicate that finite element methods provide an accurate and effective modeling approach for predicting both overall buckling and wrinkling response.
Furthermore, the study also explored buckling response of composite sandwich panels with different core thickness and face-sheet fiber angle orientation. The study found that the shell/solid element model provides an appropriate and effective modeling method to predict both overall buckling and local wrinkling behavior in composite sandwich plates.
Boggs, Joshua Thomas. "The Performance and Behavior of Deck-to-Girder Connections for the Sandwich Plate System (SPS) in Bridge Deck Applications". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32998.
Texto completoAlthough the systemâ s behavior has been studied the connection of the SPS deck to the supporting girders has not been investigated. Two types of connection are presented in this research. The use of a bent plate welded to the SPS deck and subsequently bolted to the supporting girder utilizing slip-critical connections has been utilized in the construction of a SPS bridge. A proposed SPS bridge system utilizes the top flange of the supporting girder welded directly to the SPS deck as the deck-to-girder connection.
The fatigue performance of a deck-to-girder connection utilizing a bent plate welded to the deck and bolted to the supporting girder using slip-critical connections was tested in the Virginia Tech Materials and Structures Laboratory. The testing concluded that the fatigue performance of the welded and bolted bent plate connection was limited by the weld details and no slip occurred in the slip-critical connections. Finite element modeling of the two types of deck-to-girder connections was also used to determine influence of the connections on the local and global behavior of a SPS bridge system. A comparison of the different connection details showed that the connection utilizing the flange welded directly to the SPS deck significantly reduces the stresses at location of the welds in the connections, but the connection type has a limited influence on the global behavior of a SPS bridge.
Master of Science
Nayak, Ajaya Kumar. "On dynamic analysis of laminated composite and sandwich plates using finite element method". Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/43633/.
Texto completoNash, Peter. "Experimental impact damage resistance and tolerance study of symmetrical and unsymmetrical composite sandwich panels". Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21748.
Texto completoIURLARO, LUIGI. "Development of refined models for multilayered composite and sandwich structures: analytical formulation, FEM implementation and experimental assessment". Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2606162.
Texto completoHill, Michelle Denise. "Damage resistance and tolerance investigation of carbon/epoxy skinned honeycomb sandwich panels". Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/10072.
Texto completoURRACI, ANDREA. "Development of accurate and efficient structural models for analysis of multilayered and sandwich structures of industrial interest". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2829677.
Texto completoFrancis, Philip. "The influence of shear connection strength and stiffness on the resistance of steel-concrete composite sandwich panels to out-of-plane forces". Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/848767/.
Texto completoLainé, Christian. "Étude numérique et expérimentale du comportement mécanique de plaques et coques sandwich : développement d'un élément non-linéaire, grandes transformations et application au flambement de plaques raidies en construction navale". Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10037.
Texto completoDavies, Andrew. "Crashworthiness of composite sandwich structures". Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/8402.
Texto completoMechraoui, Ahmed. "Sandwich composite de mousses polymères". Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27452/27452.pdf.
Texto completoThe aim of this work is to produce and characterize polypropylene structural composite foams. To do so, the work is divided in three parts. The first part is devoted to study the reinforcement of polypropylene with hemp fibres by changing the fibre content, fibre size and coupling agent concentration. Micrographs are used to explain the results of the mechanical properties measured under tensile and flexural stress. It is found that 2% of coupling agent gives the optimum modulus values. In the second part, polypropylene foams are produced by compression moulding with different concentrations of blowing agent to determine the effect of density reduction and density profile on the tensile and flexural properties. The morphological characteristics (cell size, cell density and skin thickness) of the foams are also examined. It is found that the use of the complete density profile is necessary to predict with high precision the mechanical results. Finally, sandwich structures are produced with different skin ratio and core densities. A complete morphological analysis is reported with mechanical properties (tensile and flexural). It is shown that the simple law of mixture and the square power-law combined with the density profile are enough to predict the effect of the skins and core, respectively.
Ou, Jeffrey. "Quality in composite sandwich fabrication". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36489.
Texto completoPalla, Leela Prasad. "Blast Response of Composite Sandwich Panels". University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1227216480.
Texto completoKazemahvazi, Sohrab. "Impact Loading of Composite and Sandwich Structures". Doctoral thesis, KTH, Lättkonstruktioner, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25141.
Texto completoQC 20101014
Denli, Huseyin. "Structural-acoustic optimization of composite sandwich structures". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 168 p, 2007. http://proquest.umi.com/pqdlink?did=1251904511&Fmt=7&clientId=79356&RQT=309&VName=PQD.
Texto completoÅkermo, Malin. "Compression moulding of thermoplastic composite sandwich components /". Stockholm, 1999. http://www.lib.kth.se/abs99/aker0422.pdf.
Texto completoSerraniÌa-Soto, Florencia. "Low velocity impact of composite sandwich panels". Thesis, Queen Mary, University of London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398305.
Texto completoZangani, D. "Modelling of z-Core composite sandwich panels". Thesis, University of Newcastle Upon Tyne, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533691.
Texto completoCowan, Andre James. "Sound Transmission Loss of Composite Sandwich Panels". Thesis, University of Canterbury. Mechanical Engineering, 2013. http://hdl.handle.net/10092/7879.
Texto completoAkil, Hazizan Md. "The impact response of composite sandwich structures". Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399096.
Texto completoTrask, Richard Simon. "Damage tolerance of repaired composite sandwich structures". Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416072.
Texto completoMaheri, M. R. "Vibration damping in composite/honeycomb sandwich beams". Thesis, University of Bristol, 1991. http://hdl.handle.net/1983/d96ba3e9-edb0-4a07-ac6e-69328ed22678.
Texto completoOluwabusi, Oludare E. "Assessing the In-plane Shear Failure of GFRP Laminates and Sandwich Structures". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1544528074090494.
Texto completoOskooei, Saeid G. "A higher order finite element for sandwich plate analysis". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0014/MQ34105.pdf.
Texto completoZare, Abdolreza. "Exact vibrational analysis of prismatic plate and sandwich structures". Thesis, Cardiff University, 2004. http://orca.cf.ac.uk/55938/.
Texto completoHu, Bo. "Bio-based composite sandwich panel for residential construction". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 5.24 Mb., 265 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3221055.
Texto completoLi, Zhuang. "Vibration and acoustical properties of sandwich composite materials /". Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/LI_ZHUANG_26.pdf.
Texto completoSlade, R. "Composite faced sandwich construction for primary spacecraft structures". Thesis, Cranfield University, 1989. http://hdl.handle.net/1826/3827.
Texto completoViolette, Michael A. "Fluid structure interaction effect on sandwich composite structures". Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5533.
Texto completoThe objective of this research is to examine the fluid structure interaction (FSI) effect on composite sandwich structures under a low velocity impact. The primary sandwich composite used in this study was a 6.35-mm balsa core and a multi-ply symmetrical plain weave 6 oz E-glass skin. The specific geometry of the composite was a 305 by 305 mm square with clamped boundary conditions. Using a uniquely designed vertical drop-weight testing machine, there were three fluid conditions in which these experiments focused. The first of these conditions was completely dry (or air) surrounded testing. The second condition was completely water submerged. The final condition was a wet top/air-backed surrounded test. The tests were conducted progressively from a low to high drop height to best conclude the onset and spread of damage to the sandwich composite when impacted with the test machine. The measured output of these tests was force levels and multi-axis strain performance. The collection and analysis of this data will help to increase the understanding of the study of sandwich composites, particularly in a marine environment.
Kulandaival, Palanivel Palaniathevar. "Manufacturing and performance of thermoplastic composite sandwich structures". Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438298.
Texto completoVelecela, Chuquilla Orlando Jonathan. "Energy absorption capability of GRP composite sandwich structures". Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434504.
Texto completoVogler, Tracy J. (Tracy John). "Compressive behavior and failure of composite sandwich panels". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11677.
Texto completoGigliotti, Luigi. "Multiscale analysis of damage-tolerant composite sandwich structures". Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/32365.
Texto completoToribio, Michael Garcia-Lopez 1975. "Compressive response of notched composite-honeycomb sandwich panels". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/50540.
Texto completoIncludes bibliographical references (leaves 237-250).
Experimental and numerical work was conducted to understand better the compressive response of notched composite sandwich panels. The quasi-static uniaxial compressive response of notched (circular through hole) E-glass/epoxy- NomexTM sandwich panels were studied experimentally. Two different woven fabric architectures were examined. The key failure mechanism was observed to be linear damage zones (LDZs) emanating from the notch tip (in both materials). LDZ's behaved in a macroscopically similar manner to a bridged crack under tensile loading, and were characterized by semi-stable propagation. Crosssectioning studies revealed the key damage mechanisms operating within the LDZ. Progressive cross-sections indicated that individual fiber microbuckling led to out-of-plane warp tow kinking. The LDZ wake was characterized by kinking in all warp tows and transverse tow splitting. Strain gages were used to measure the in situ damage zone tractions as the LDZ propagated across the width of the specimen; a softening trend was observed. Consistent with observations, a two parameter linear strain softening traction law was used to model the LDZ constitutive behavior. The traction law was treated as a material property. The damage zone modeling (DZM) framework was investigated to determine its validity, specifically its ability to predict three experimentally observed phenomena: the notched strength, local strain distribution, and LDZ growth characteristics. A self-consistent physically-based model should be able to predict all three phenomena. Two models were created in order to interrogate the DZM. The damage growth model was used to determine the ability of the DZM to predict the LDZ growth behavior and notched strength. A finite element model that used discrete nonlinear springs in the wake of the LDZ to model the LDZ as a continuous spring, was implemented to determine if the DZM could predict the local strain distribution. Results showed that the current traction law provided excellent agreement with the phenomenon used to calibrate the traction law, for all specimen sizes. Extension of predictive power to other phenomena resulted in weaker correlations. The modeling framework and methodology established provide a robust tool for investigating the potential of adding physical bases to the DZM.
by Michael Garcia-Lopez Toribio.
S.M.
Siddiqui, Faisal Karim. "Extended higher order theory for sandwich plates of arbitrary aspect ratio". Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54334.
Texto completoYu, Zhaohui Crocker Malcolm J. "Static, dynamic and acoustical properties of sandwich composite materials". Auburn, Ala., 2007. http://repo.lib.auburn.edu/2006%20Fall/Dissertations/YU_ZHAOHUI_54.pdf.
Texto completoBull, Peter H. "Damage tolerance and residual strength of composite sandwich structures". Doctoral thesis, KTH, Aeronautical and Vehicle Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3757.
Texto completoThe exploitation of sandwich structures as a means toachieve high specific strength and stiffness is relatively new.Therefore, the knowledge of its damage tolerance is limitedcompared to other structural concepts such as truss bars andmonocoque plate solutions.
Several aspects of the damage tolerance of sandwichstructures are investigated. The influence of impact velocityonresidual strength is investigated. Sandwich panels withfaces of glass fiber reinforced vinylester are impacted bothwith very high velocity and quasi static. The residual strengthafter impact is found to be similar for both cases of impactvelocity.
Curved sandwich beams subjected to opening bending momentare studied. Faceñcore debonds of varying size areintroduced between the compressively loaded face sheet and thecore. Finite element analysis in combination with a pointstress criterion is utilized to predict the residual strengthof the beams. It is shown that it is possible to predict thefailure load of the beams with face-core debond.
Using fractography the governing mode of failure ofcompressively NCF-carbon is characterized. Sandwich panelssubjected to compression after impact are shown to fail byplastic micro buckling.
The residual compressive strength after impact of sandwichpanels is investigated. Sandwich panels with face sheets ofnon-crimp fabric (NCF) carbon are subjected to different typesof impact damages. Predictions of residual strength are madeusing the Budiansky, Soutis, Fleck (BSF) model. The residualstrength is tested, and the results are compared topredictions. Predictions and tests correlate well, and indicatethat the residual strength is dependent on damage size and notthe size of the damaged panel.
A study of the properties of a selection of fiberreinforcements commonly used in sandwich panels is conducted.The reinforcements are combined with two types of core materialand three types of matrix. Also the influence of laminatethickness is tested. Each combination materials is tested inuni-axial compression, compressive strength after impact andenergy absorption during quasi static indentation. Thespecimens which are tested for residual strength are eithersubjected to quasi-static or dynamic impact of comparableenergy level. Prediction of the residual strength is made andcorrelates reasonably whith the test results. The tests showthat if weight is taken into account the preferred choice offiber reinforcement is carbon.
Bambal, Ashish S. "Mechanical evaluation and FE modeling of composite sandwich panels". Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5379.
Texto completoTitle from document title page. Document formatted into pages; contains xviii, 141 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 140-141).
Hanafi, Wemphy. "Flexural performance of glass fiber reinforced composite sandwich panels /". Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1328053201&sid=33&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Texto completoKratz, James. "Processing composite sandwich structures using out-of-autoclave technology". Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=67000.
Texto completoPrésentement, la technologie hors autoclave (OOA) est utilisée pour la conception et la fabrication à moindre coût des composants structuraux en composite. La technologie OOA permet de produire des composites en utilisant uniquement la pression générés lors des procédés d'ensachage sous vide, en éliminant par le fait même les coûts relatifs à l'achat et à l'exploitation d'un autoclave. L'avantage des matériaux pré-imprégnés destinés à des cuissons hors autoclave est qu'ils sont spécialement conçus pour éliminer les bulles d'air emprisonnées au cours de la préparation. Afin de déterminer la configuration d'ensachage optimale pour la production de structure en sandwich avec noyau en nid d'abeille, l'épaisseur du matériel pré-imprégné ainsi que la perméabilité à travers le plan ont été caractérisées. Les conditions d'ensachage ayant menées à la plus faible porosité correspondent à l'utilisation combinée d'une couche non perforée de pellicule antiadhésive et d'une bordure permettant l'extraction des produits gazeux. La pellicule antiadhésive non perforée permet de prévenir les pertes de résine, tandis que la bordure permettant l'extraction des produits gazeux permet d'évacuer l'air contenu dans le noyau et les couches pré-imprégnés. L'utilisation d'une pellicule non perforée s'est avérée nécessaire puisque la teneur en résine du matériel pré-imprégné est telle que toute perte de résine crée des régions dites sèches (non imprégnée), produit des trous ou défauts à la surface du laminé et augmente la porosité. Il convient d'être prudent lors du dégazage des panneaux en sandwich hors autoclave puisque la suppression de tout l'air contenue dans le noyau réduit le niveau de compaction disponible durant la cuisson. L'application d'une force de compaction adéquate doit être effectuée lors de la cuisson afin de réduire la formation de vide
Tsang, Pui Ho Wilson. "Impact resistance and damage tolerance of composite sandwich panels". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11925.
Texto completo