Segui questo link per vedere altri tipi di pubblicazioni sul tema: Fabrication.
Tesi sul tema "Fabrication"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Vedi i top-50 saggi (tesi di laurea o di dottorato) per l'attività di ricerca sul tema "Fabrication".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Vedi le tesi di molte aree scientifiche e compila una bibliografia corretta.
1
Rader, Nicolas Glen. "DESIGN [fabrication] BUILD". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34425.
Testo completoAbstract (sommario):
Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 2006.Includes bibliographical references (p. 73-75).
DESIGN [fabrication] BUILD proposes a new relationship among the architect, homeowner, and fabricator/assembler through the use of parametric software in order to create a truly customizable prefabricated home. This customization is possible through the combination of the software with CNC machinery and a material yet to be fully explored by architects, honeycomb composite panel. The result is a kit of parts that is efficient in terms of time and cost in design, production, and assembly, it is offered as an improvement from contracted stick built construction.
by Nicolas Glen Rader.
M.Arch.
2
Garvey, Carrie Rosicky. "Foliage and Fabrication". VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/664.
Testo completoAbstract (sommario):
In my photographic work, I contrast natural and man-made objects abstracted by manipulation of scale. Details of the objects are blown up to proportions larger than life. By distorting the scale, I aim to allow the audience to view the image out of context, enabling the viewer to see it for its aesthetic value rather than the object's functional purpose.
3
Høvik, Jens. "Photonic Crystal Waveguide Fabrication". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19277.
Testo completoAbstract (sommario):
This research is entirely devoted to the study and fabrication of structures with periodic dielectric constants, also known as photonic crystals (PhCs). These structures show interesting dispersion characteristics which give them a range of prohibited frequencies that are not allowed to propagate within the crystal. This property makes them suited for a wide array of photonic-based components. One-dimensional photonic crystals are already commercialized and are of widespread use in for example thin-film optics, and two-dimensional PhCs are available in the form of photonic crystal fibers.Much work is being done on the analysis of photonic crystals and their application in various photonic components. In designing any photonic crystal component the properties of the crystal must first be understood and analyzed. By using frequency-domain simulation software we have studied the properties of bulk photonic crystals and designed the ideal structure for confining light of any design wavelength within a three-dimensional photonic crystal slab.Through simulations, the ideal periodicity of the PhC has been found along with its optimal geometry for waveguiding purposes. The study was then extended to three dimensions and the optimal thickness of the PhC slab was found. By using these determined values we were able to properly confine light inside a defect in a photonic crystal structure. This phenomenon allowed us to briefly examine the use of a photonic crystal as a waveguide. This research was then continued by attempting to fabricate such a device. Methods entailing how to create a silicon-on-insulator wafer through plasma enhanced chemical vapor deposition were developed. Profilometry, refractometry and ellipsometry were used to characterize the quality of the SOI wafer. A surface roughness between 1.5-3.5 nm was found. The losses of the amorphous silicon was attempted to be measured through ellipsometry, but the ellipsometer was found incapable for loss meassurements. Better testing methods must therefore be developed.The PhC waveguiding structure is formed thorugh electron-beam lithography, and various thicknesses of photoresist are tested and characterized. Furthermore, various materials were attempted as an etch mask. Polymethyl methacrylate, $SiO_2$, and chromium were all utilized, where only the latter showed good enough selectivity for silicon etching. This lead to using both chromium and $SiO_2$ as the mask of choice. Several etching methods were tested. Both standard wet etching, room-temperature reactive ion etching recipes as well as cryogenic inductively coupled plasma reactive ion etching recipes were employed. Dry etching was found to be of insufficient quality, while the complete isotropy of wet etching rendered it impractical for fine structures needed for a PhC waveguide.The final solution which allowed the formation of the photonic crystal was a stacked structure, using both chromium, oxide, and PMMA throughout the etching process in order to achieve the wanted results. The PMMA was used as an etch mask to imprint the pattern in the oxide layer. The oxide layer was in turn used as an etch mask to imprint the pattern into the chromium, and the chromium served as the final mask to be used during cryogenic silicon etching. The cryogenic silicon etching recipe was characterized and shown to be sufficiently anisotropic as well as having a rather high maximum etch depth. The recipe show an unwanted formation of so-called silicon grass, and a high sidewall roughness is observed. Finally, a complete PhC waveguiding structure with both a grating, a taper, and a silicon waveguide is fabricated. Although they require more work to be optimized, the methods presented in this thesis provide the basis for fabricating a multitude of optical components, not only PhC's.
4
More, Daesha. "Microhotplate Sensor Array Fabrication". Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/MoreD2007.pdf.
Testo completo
5
Han, Sarah (Sarah J. ). "Biologically inspired digital fabrication". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85422.
Testo completoAbstract (sommario):
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 37-40).
Objects and systems in nature are models for the practice of sustainable design and fabrication. From trees to bones, natural systems are characterized by the constant interplay of creation, environmental response, and analysis of current structural constituents, as part of a larger dynamic system. In contrast, traditional methods of digital design and fabrication are characterized by a linear progression of three main stages: modeling (digital generation in the digital domain), analysis (digital mapping of the physical domain), and fabrication (physical generation of the digital domain). Moving towards a system process where modeling, analysis, and fabrication are integrated together for the development of a dynamic process will transform traditional fabrication technology and bring about the creation of sustainable and more efficient synthetic environments. Integration of modeling, analysis, and fabrication into one fluid process requires the development of a fabrication platform with capabilities for real time control. This thesis explores and investigates the creation of a framework for real time control of industrial robotic arms as part of a multipurpose fabrication platform.
by Sarah Han.
M. Eng.
6
Hsu, Charles Heng-Yuan 1967. "Silicon microaccelerometer fabrication technologies". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43545.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (leaves 275-282).
by Charles Heng-Yuan Hsu.
Ph.D.
7
Li, Guixin. "Superlens design and fabrication". HKBU Institutional Repository, 2009. http://repository.hkbu.edu.hk/etd_ra/1066.
Testo completo
8
Xia, Sijing. "Fabrication of protein nanostructures". Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/10126/.
Testo completo
9
RUBERTO, FRANCESCO. "Fablabs to transform the Italian Industry: The Case of the Fablabs Community". Doctoral thesis, Università degli studi di Pavia, 2017. http://hdl.handle.net/11571/1220438.
Testo completoAbstract (sommario):
This research studies the case of Fablabs community helping the Italian industry in the process of innovation and growth. This case is representative of how entrepreneurs engage in Fablab digital fabrication technologies which allow to make almost anything and optimizing time and production cost. The number of entrepreneurs in Italy using Fablab services is exploding. However, while entrepreneurs in the main centers of innovation, such as Silicon Valley, have crucial social, cultural, economic, and material resources to build high-impact companies, these resources are often not present in moderate innovators countries. Those resources are defined as innovation infrastructures, stable and dependable resources necessary to systematically conduct technology innovation activities. Entrepreneurs in moderate innovators countries have a double challenge of excelling at their company, and using innovation infrastructures such as Fablabs. This research analyzes how Fablabs can facilitate the innovation activities of the Italian industries, reviewing the case of Fablabs who experience success in providing services to companies. To obtain useful data that match the research objectives, this study use a Focus group interview method. The questions are open-ended, which means that during the interviews, the actual questions may change according to the responses of the interviewees. I depended on triangulation as a means of ensuring construct validity. Data triangulation involves collecting data from interviews, observations, and document analysis. The findings will contribute to understanding the role that Fablabs play for the Italian industry, explaining how digital fabrication technologies can help Italian companies to be more competitive.
Keywords: Fablab, Italian industry, MIT, Digital Fabrication, Neil Gershenfeld, case study, Silicon Valley.This research studies the case of Fablabs community helping the Italian industry in the process of innovation and growth. This case is representative of how entrepreneurs engage in Fablab digital fabrication technologies which allow to make almost anything and optimizing time and production cost. The number of entrepreneurs in Italy using Fablab services is exploding. However, while entrepreneurs in the main centers of innovation, such as Silicon Valley, have crucial social, cultural, economic, and material resources to build high-impact companies, these resources are often not present in moderate innovators countries. Those resources are defined as innovation infrastructures, stable and dependable resources necessary to systematically conduct technology innovation activities. Entrepreneurs in moderate innovators countries have a double challenge of excelling at their company, and using innovation infrastructures such as Fablabs. This research analyzes how Fablabs can facilitate the innovation activities of the Italian industries, reviewing the case of Fablabs who experience success in providing services to companies. To obtain useful data that match the research objectives, this study use a Focus group interview method. The questions are open-ended, which means that during the interviews, the actual questions may change according to the responses of the interviewees. I depended on triangulation as a means of ensuring construct validity. Data triangulation involves collecting data from interviews, observations, and document analysis. The findings will contribute to understanding the role that Fablabs play for the Italian industry, explaining how digital fabrication technologies can help Italian companies to be more competitive. Keywords: Fablab, Italian industry, MIT, Digital Fabrication, Neil Gershenfeld, case study, Silicon Valley.
10
Chen, Xiang. "Making Fabrication Real: Fabrication for Real Usage, with Real Objects, by Real People". Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1139.
Testo completoAbstract (sommario):
The increasingly personal and ubiquitous capabilities of computing—everything from smartphones to virtual reality—are enabling us to build a brave new world in the digital realm. Despite these advances in the virtual world, our ability as end-users to transform the physical world still remains limited. The emergence of low-cost fabrication technology (most notably 3D printing) has brought us a dawn of making, promising to empower everyday users with the ability to fabricate physical objects of their own design. However, the technology itself is oblivious of the physical world—things are, in most cases, assumed to be printed from scratch in isolation from the real world objects they will be attached to and work with. To bridge this ‘gulf of fabrication’, my thesis research focuses on developing fabrication techniques with design tool integration to enable users to expressively create designs that can be attached to and function with existing real-world objects. Specifically, my work explores techniques that leverage the 3D printing process to create attachments directly over, onto and around existing objects; a design tool further enables people to specify and generate adaptations that can be attached to and mechanically transform existing objects in user-customized ways; a user-driven approach allows people to express and iterate structures that are optimized to support existing objects; finally, a library of ‘embeddables’ demonstrate that existing objects can also augment 3D printed designs by embedding a large variety of material to realize different properties and functionalities. Overall my thesis aspires to make fabrication real—enabling people to express, iterate and fabricate their designs that closely work with real-world objects to augment one another.
11
Maksoud, Aref. "Parametric Design and Digital Fabrication: Journey with parametric design and digital fabrication in architecture". Doctoral thesis, Universitat Internacional de Catalunya, 2017. http://hdl.handle.net/10803/456562.
Testo completoAbstract (sommario):
Complexity and Strategies for parametric design in architecture. An
application of practice led research. Nowadays a new specialist design role is
emerging in the construction industry. The primary task related to this role is
focused on the control, development and sharing of geometric information
with members of the design team in order to develop a design solution.
Individuals engaged in this role can be described as a parametric designers.
Parametric design involves the exploration of multiple solutions to
architectural design problems using parametric models. In the past these
models have been defined by computer programs, now commercially
available parametric software provides a simpler means of creating these
models. It is anticipated that the emergence of parametric designers will
spread and a deeper understanding of the role is required.
This thesis is aimed at establishing an understanding of the tasks related to
this new specialism and to develop a set of considerations that should be
made when undertaking these tasks. The position of the parametric designer
in architectural practice presents new opportunities in the design process this
thesis also aims to capture these.
Through research and design, this thesis seeks to answer two questions:
what is parametric design and how can it benefit the field of architecture?
Looking at historical and present-day sources, the evolution of computer
aided design has been drawn out leading to the emergence of parametric
design. An explanation and analysis of parametric tools, including a series of
case studies, has been conducted to show how these tools are presently
being utilized by designers.
12
Kwon, Jimmy Y. (Jimmy Yongil). "Remote fabrication of integrated circuits : software support for the M.I.T. computer aided fabrication environment". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37794.
Testo completo
13
Hsing, Mitchell David. "Design, fabrication, and characterization of a compact magnetron sputtering system for micro/nano fabrication". Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122559.
Testo completoAbstract (sommario):
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019Cataloged from PDF version of thesis.
Includes bibliographical references (pages 215-218).
A general rule of thumb for new semiconductor fabrication facilities (fabs) is that revenues from the first year of production must match the capital cost of building the fab itself. With modem fabs routinely exceeding $1 billion to build, this rule serves as a significant barrier to entry for groups seeking to commercialize new semiconductor devices aimed at smaller market segments which require a dedicated process. To address this gap in the industry, we are developing a I" Fab line of dedicated tools which processes small 1-2" wafers and feature the same functionality as large-scale commercial micro/nano fabrication tools, but with a significant reduction in cost and footprint. To enable the envisioned 1" Fab a reality, this thesis describes the design, development and testing of a sputtering physical vapor deposition tool, a critical tool in the 1" Fab line of tools.
The tool is designed to be compatible with the 1" Fab's four-module, modular tool infrastructure, and also to allow for sharing of its peripheral equipment with other components of the 1" Fab. The modularity feature allows for multiple tools be created using an interchangeable tool platform while the shared backend equipment feature allows for a sizable cost-saving benefit, as the cost of peripheral equipment for any given tool is up to 70% of the tool's total cost. Our developed sputtering tool features the successful implementation of these two design components with a final build cost of around $25k - roughly one-seventh of the cost of a commercial tool. The sputtering tool's performance was fully characterized for both reactive and nonreactive sputtering processes. The tool's non-reactive metal depositions were examined in detail using a design of experiment response surface model.
Deposition rates of up to 5.5 A/s were observed while maintaining a uniformity of ~3% across the wafer. Utilizing a direct sputter technique, this represents a deposition rate that is 4x faster than state of the practice tools while also attaining the same level of uniformity. Alongside the development of metal depositions processes, the reactive sputtering capabilities of the tool were also demonstrated through successful process development for the deposition of Aluminum Nitride (AlN). Three unique operation regions, for AlN reactive sputtering were discovered with the highest quality AlN depositions observed in transition region. Stable and repeatable depositions were achieved via the development of two control methods - voltage control and flow control. Using this optimized process, highly c-axis aligned films with columnar growth structures were observed indicating the production of high quality AlN films.
This successfully developed tool alongside its optimized processes is well suited for integration into the 1" Fab, further enabling the realization of our envisioned low-cost micro/nano fabrication platform.
by Mitchell David Hsing.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
14
Wong, Susanna Wing Man. "Microdisk fabrication by emulsion evaporation". Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/6006.
Testo completoAbstract (sommario):
Colloidal suspensions of disk-like particles have been of interest in both colloidal and liquid crystal studies because they exhibit unique liquid crystalline phases different from those of rod-like molecules. Disk-like particles, such as asphaltenes in heavy oil industry, clay particles in agriculture, and red blood cells in biology, are of great interest in a variety of industries and scientific areas. However, to fabricate monodisperse microdisks, uniform in structure or composition with precise control of particle size and shape has not yet succeeded. In this thesis, we show an experimental strategy of using microfluidic technique to fabricate homogeneous ñ-eicosene microemulsions with chloroform in an aqueous solution of sodium dedecyl sulfate (SDS). The monodisperse chloroform emulsions, generated by the glass-based microfluidic devices, ensure the precise control on microdisk particle size and shape. A systematic investigation was performed to study the relation between the resulted microdisk size and the initial concentration of ñ-eicosene in chloroform before evaporation. The smectic liquid crystalline phase inside the wax particles controls the coin-like disk shape below the melting temperature of waxâÂÂs rotator phase. The kinetics of the disk formation is observed using a polarized light microscope. Dynamic light scattering is used to characterize the Brownian motion of the microdisks, and the rotational diffusion is estimated from the image sequences taken by the charge-coupled device (CCD) camera. Effort has been put into collecting a large quantity of microdisks to investigate the discotic liquid crystalline phases, which can be readily probed by light scattering and microscope. In comparison, X-ray and neutron have to be used for the atomic liquid crystalline phase investigation.
15
Woodward, Lisa. "Fabrication of Novel Suspended Inductors". Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/870.
Testo completoAbstract (sommario):
With the rapid growth in the wireless industry there has been increasing demand to make devices with better performance. This means lower power, lower voltage, smaller, and in general more efficient. This has lead to the interest in and necessity for good quality passive components. Good quality passive components make better filters, baluns, voltage controlled oscillators, and matching networks. There has been a lot of work over the last ten years focused on improving the quality of inductors. Typical inductors fabricated on silicon have Q factors of approximately 10. This is because silicon is conductive and therefore acts like a lossy ground plane and develops interfering currents. Improvements that have been attempted include thicker metal layers, thicker dielectric layers, patterned ground shields, as well as using multiple metal layers. These methods, however, still do not improve inductors to the quality of those built on insulating substrates such as glass. The main successful attempt on silicon has been where the inductor coil is released so that it is in the air supported by posts. In some work the inductor coil is raised 50 to 100µm above the underpass by methods like etching or photoresist molding. The suspended inductor approach was applied to an insulating substrate to fabricate and characterize unique suspended inductors and transformers. Inductors were released to have 1µm of air underneath the coil by the use of a release etch. Transformers were made in a similar way except two released layers where used. The top coil, done in plated gold, was released as well as an interconnection layer. Such a small air gap and the transformers with two released metal layers are a couple of the unique features of this thesis work. The devices were characterized up to 20GHz before and after release. An improvement in the peak Q factor (up to 70), as well as in the self-resonance frequency (up to 4GHz higher) was noticed after release. This is expected due to the reduction in parasitics. The results were then compared with simulations and a couple closed form expressions, both of which were able to give a reasonable accuracy. There was also success in getting good high frequency transformers.
Even though some good high-Q inductors were fabricated as part of this thesis, there is still further work that can be done. This includes packaging, integration with capacitors, and further optimization.
16
Ayesh, Ahmad Ibrahim. "Device fabrication using Bi nanoclusters". Thesis, University of Canterbury. Phsics and Astronomy, 2007. http://hdl.handle.net/10092/3272.
Testo completoAbstract (sommario):
Nanoclusters have special importance in nanotechnology because of their low dimensionality, which provides electronic, chemical, and magnetic properties that differ from those of the equivalent bulk materials. Suitably controllable self-assembly methods are required in order to incorporate nanoclusters into useful devices. The self-assembly method used in this study employs V-grooves as a template element for nanocluster device fabrication. The V-grooves are fabricated by optical lithography on SiO2/Si wafers and KOH wet etching. Bi clusters deposited on a V-groove form a self-assembled conducting wire. The clusters are produced using an inert gas aggregation source inside an ultra high vacuum compatible system. In order to characterise the assembly process, Bi clusters with different average sizes and velocities are deposited on V-grooves with different widths. The cluster bouncing was found to be the main process in forming the cluster wires. The bouncing angles were smaller than the incident angle, and they are dependent on the cluster size and velocity. For a certain bouncing angle, the wire width reflects the V-groove width because of the fixed bouncing angle. Nanocluster devices were fabricated by depositing the clusters on V-grooves with pre-formed Au/NiCr electrical contacts. The amount of the deposited material required to form an electrically conducting wire was found to be a function of the V-groove width and the wire length. The two point I(V) measurements in the voltage range between -1 and +1V showed linear characteristics for low resistance wires (kΩ), and non-linear characteristics for the high resistance ones (MΩ). The silicon substrate was used as a back gate. Applying a voltage to the gate was found to modify the electrical conduction of the cluster wire. The temperature dependence of the resistance of the nanocluster wires was studied in the temperature range of 4.2-473K, and all of the measured wires showed a negative temperature coefficient of resistance. These measurements allowed a detailed study of the conduction mechanisms through the cluster wires. The study showed that Bi clusters can be used for device fabrication. To size select the clusters prior to using them for the device fabrication, a high transmission mass filter is required. This transmission can be obtained using the von Issendorff and Palmer mass filter if it is operated using the optimum operation conditions. The mass filter consists of two pairs of parallel plates with horizontal openings in Plates 1 and 2, and it operates on the time of flight principle. During this project, the operation conditions of this mass filter were studied using both experiment and simulation. The study showed that the beam deflection angle is a critical factor in optimising the mass filter transmission efficiency. This angle is dependent on the accelerating voltage, ion mass, and the horizontal velocity of the ions. The optimum operation conditions for the mass filter were found and used to study the mass distribution of Pd ions produced by a magnetron sputtering source with variable cluster aggregation length.
17
Ng, Man-ching Alan. "Organic nanostructures fabrication and characterization /". Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38701364.
Testo completo
18
Muller, Pierre. "Fabrication additive de pièces multimatériaux". Phd thesis, Ecole centrale de nantes - ECN, 2013. http://tel.archives-ouvertes.fr/tel-00918030.
Testo completoAbstract (sommario):
Les pièces multimatériaux à gradient fonctionnel (Functionally Graded Materials - FGM) sont des structures dont la composition et la microstructure du matériau changent graduellement à l'intérieur de la pièce. Cette distribution des matériaux permet de réaliser des gradients de propriétés au niveau mécanique, physique, chimique, etc. Les domaines d'application sont nombreux pour ces pièces, en particulier l'aérospatial et le biomédical mais également l'électronique, l'énergie nucléaire, la production d'outillage, le design, etc. L'utilisation des procédés innovants tels que les procédés de fabrication additive est indispensable pour la réalisation de pièces multimatériaux complexes. Bien que ces procédés aient les caractéristiques attendues pour la réalisation de pièces multimatériaux, on constate qu'aucune pièce fonctionnelle n'a encore été fabriquée à ce jour. Pour permettre la fabrication de pièces fonctionnelles, il est indispensable de proposer une méthodologie de fabrication complète permettant de passer de l'objet imaginé par le concepteur à la fabrication. Cette méthodologie doit comporter les étapes suivantes : description de la pièce à fabriquer, détermination d'une stratégie de fabrication adaptée et génération des instructions de fabrication. Parmi les étapes du processus de fabrication, celle de choix d'une stratégie de fabrication occupe une place importante. En effet, les caractéristiques de pièces - géométrie et répartition des matériaux - sont fortement dépendantes de la stratégie de fabrication choisie. Les travaux de thèse portent principalement sur les méthodes mises en place pour la détermination de trajectoires appropriées à la fabrication des pièces multimatériaux. Ces méthodes reposent sur la modélisation du procédé nécessaire à l'évaluation des stratégies et une optimisation du procédé permettant de diminuer les différences entre la répartition des matériaux souhaitée et celle fabriquée. Une des méthodes proposées permet d'obtenir automatiquement des trajectoires parfaitement adaptées aux pièces multimatériaux et repose sur la modélisation et l'optimisation du procédé. Ces travaux sont intégrés dans une méthodologie de fabrication de pièces multimatériaux. De plus, une maquette informatique a été développée pour mettre en avant les possibilités d'utilisation de cette méthodologie.
19
Poirier, Dominique. "Fabrication of aluminum based nanomaterials". Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66642.
Testo completoAbstract (sommario):
Structural applications in transportation necessitate materials with high specific strength and stiffness. With its low density, aluminum (Al) is an interesting candidate, but further strengthening would be beneficial. In this work, the benefits and limitations of nanoreinforcements for aluminum strengthening has been assessed through the addition of carbon nanotube (CNTs) and nanometric alumina (n-Al2O3) to an aluminum matrix by powder metallurgy. It has been found that mechanical milling can homogeneously disperse n-Al2O3 in aluminum. Furthermore, mechanical milling offers the advantages of strengthening the aluminum powder through grain refinement, cold working, solid solution and precipitation. However, CNTs are damaged by mechanical milling, and their homogeneous dispersion cannot be achieved with a chemical dispersant. Nanocomposite consolidation has presented several challenges as hot pressing resulted in a lack of bonding, grain growth and the formation of Al4C3 from damaged CNTs. Cold spraying of Al2O3/Al has resulted in a porous coating with decreased hardness. The microhardness and compression properties of an Al2O3/Al nanocomposite produced by mechanical milling followed by hot pressing were measured. Comparison with modeled values and literature results indicates that higher experimental yield strength obtained with the addition of n-Al2O3 versus micron size Al2O3 is due to in-situ matrix strengthening. Modeling shows that CNTs offer high potential gains in stiffness due to their high aspect ratio and their high Young modulus. On the other hand, as yield gains associated with the addition of nanoreinforcement are mainly due to matrix strengthening, discontinuous nanocomposites do not benefit from the CNT's exceptional strength. In this case, n-Al2O3 would be selected over CNTs as it is cheaper and more easily dispersed.Les applications structurales du secteur des transports nécessitent des matériaux avec des résistances mécaniques et des rigidités spécifiques élevées. Avec sa faible densité, l'aluminium s'avère un candidat de choix. Par contre, pour favoriser son utilisation, l'augmentation des propriétés spécifiques est nécessaire.Dans ce projet, le potentiel et les limitations des nanorenforts pour l'augmentation de la résistance mécanique de l'aluminium ont été évalués. Pour ce faire, des composites à matrice d'aluminium renforcés par nanotubes de carbone (CNTs) et alumine nanométrique (n-Al2O3) ont été fabriqués par métallurgie des poudres. Il a été constaté que le broyage mécanique disperse de manière homogène l'alumine nanométrique dans l'aluminium. En plus, le broyage mécanique offre l'avantage de renforcer la matrice d'aluminium par affinement des grains et écrouissage en plus de procurer un durcissement par solution solide et par précipitation. Par contre, les nanotubes de carbone sont endommagés par le broyage et il n'est pas possible d'obtenir une dispersion homogène des nanotubes dans l'aluminium par l'utilisation d'un dispersant chimique.La consolidation des nanocomposites présente aussi de nombreux défis puisque le pressage à chaud ne permet pas un bon frittage, provoque la croissance des grains et mène à la formation de carbures à partir des nanotubes endommagés. La pulvérisation à froid des poudres composites Al2O3/Al a quant à elle produit un revêtement poreux avec une dureté réduite.La microdureté et les propriétés mécaniques en compression du nanocomposite Al2O3/Al produit par broyage mécanique suivi d'un pressage à chaud ont été mesurées. La comparaison de ces résultats avec les valeurs modélisées et celles provenant de la littérature indique que le gain en limite d'élasticité obtenu expérimentalement avec l'addition d'alumine nanom
20
Hassall, P. "Conducting moulds and electro-fabrication". Thesis, Staffordshire University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380263.
Testo completo
21
Ng, Man-ching Alan, e 吳文政. "Organic nanostructures: fabrication and characterization". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38701364.
Testo completo
22
Zhang, Dou. "Fabrication of ceramic micro-components". Thesis, University of Birmingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433435.
Testo completo
23
Hill, Graeme. "Fabrication and characterization of nanowires". Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427296.
Testo completo
24
Ou, Jeffrey. "Quality in composite sandwich fabrication". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36489.
Testo completo
25
Villalon, Rachelle B. (Rachelle Bentajado). "Reasonable computing for architectural fabrication". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43752.
Testo completoAbstract (sommario):
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2008.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 63-64).
The use of digital fabrication tools in the architecture industry serve a particular group of individuals whose familiarity of the tools are by trade skill. Machines lack the understanding of people in its ability to objectify common knowledge. This thesis describes the Adeon system, a software agent for implementation at the initial design stages whereupon the designer conceptualizes about a particular building component while the Adeon system serves to bridge the gap between design and construction knowledge, fusing the two regions to ultimately inform the designer about particular construction, design, and cost analysis constraints and opportunities upon the design proposal. The system adapts to different design situations and delivers pertinent information lending to its capacity to understand design moves and translate it to machine readable instructions for direct digital fabrication.
by Rachelle B. Villalon.
S.M.
26
Levitan, Jeremy Asher 1977. "Methods for self-fabrication chips". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/89313.
Testo completo
27
Lauer, Isaac 1976. "Double-sided CMOS fabrication technology". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86778.
Testo completo
28
Chen, Desai. "Multiscale methods for fabrication design". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115635.
Testo completoAbstract (sommario):
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 135-146).
Modern manufacturing technologies such as 3D printing enable the fabrication of objects with extraordinary complexity. Arranging materials to form functional structures can achieve a much wider range of physical properties than in the constituent materials. Many applications have been demonstrated in the fields of mechanics, acoustics, optics, and electromagnetics. Unfortunately, it is difficult to design objects manually in the large combinatorial space of possible designs. Computational design algorithms have been developed to automatically design objects with specified physical properties. However, many types of physical properties are still very challenging to optimize because predictive and efficient simulations are not available for problems such as high-resolution non-linear elasticity or dynamics with friction and impact. For simpler problems such as linear elasticity, where accurate simulation is available, the simulation resolution handled by desktop workstations is still orders of magnitudes below available printing resolutions. We propose to speed up simulation and inverse design process of fabricable objects by using multiscale methods. Our method computes coarse-scale simulation meshes with data-drive material models. It improves the simulation efficiency while preserving the characteristic deformation and motion of elastic objects. The first step in our method is to construct a library of microstructures with their material properties such as Young's modulus and Poisson's ratio. The range of achievable material properties is called the material property gamut. We developed efficient sampling method to compute the gamut by focusing on finding samples near and outside the currently sampled gamut. Next, with a pre-computed gamut, functional objects can be simulated and designed using microstructures instead of the base materials. This allows us to simulate and optimize complex objects at a much coarser scale to improve simulation efficiency. The speed improvement leads to designs with as many as a trillion voxels to match printer resolutions. It also enables computational design of dynamic properties that can be faithfully reproduced in reality. In addition to efficient design optimization, the gamut representation of the microstructure envelope provides a way to discover templates of microstructures with extremal physical properties. In contrast to work where such templates are constructed by hand, our work enables the first computational method to automatically discovery microstructure templates that arise from voxel representations.
by Desai Chen.
Ph. D.
29
Hennessy, John 1980. "Germanium on insulator fabrication technology". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28556.
Testo completoAbstract (sommario):
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (p. 53-55).
As CMOS devices continue to scale to smaller dimensions, it has become clear that new materials and structures are needed to also continue to improve performance. Germanium on insulator is proposed as it combines both a high mobility material (relative to silicon) and a structure with improved scaling characteristics compared to bulk devices. The goal of this work is to develop of procedure for the transfer of a germanium layer to bulk silicon by means of wafer bonding and hydrogen-induced layer transfer.
by John Hennessy.
S.M.
30
Popescu, George A. "Digital materials for digital fabrication". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41754.
Testo completoAbstract (sommario):
Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2007.Includes bibliographical references (leaves 50-51).
This thesis introduces digital materials by analogy with digital computation and digital communications. Traditional fabrication techniques include pick-and-place, roll-to-roll, molding, patterning and more. Current research in fabrication includes algorithmic assembly [3], programmed assembly[9], self-assembly[1,2], assembly by folding [4] as well as guided self-assembly [2]. While these research areas are studying means of fabrication, here we introduce the study of the digital materials they assemble. Moreover we present a new type of three-dimensional digital printer for use with functional digital materials. Most importantly, the digital materials are shown to be tuneable; the code describing a digital material allows one to predict and adjust the properties of the material itself. In the same 'way digital communications and computation are discrete in the code space, digital fabrication is discrete in the physical space. Just as digital communications enabled cheap long-distance communications and digital computation enabled cheap,universal and efficient computers, digital fabrication enables cheap, efficient and universal fabrication. Building digitally will reduce the complexity of the assembler and can produce a wider variety of objects for a smaller cost.
by George A. Popescu.
S.M.
31
Georgoulakis, Rachel. "Généralités sur la fabrication aseptique". Paris 5, 1997. http://www.theses.fr/1997PA05P205.
Testo completo
32
Greene, John Rausch. "Inquiry of Graphene Electronic Fabrication". DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1671.
Testo completoAbstract (sommario):
Graphene electronics represent a developing field where many material properties and devices characteristics are still unknown. Researching several possible fabrication processes creates a fabrication process using resources found at Cal Poly a local industry sponsor. The project attempts to produce a graphene network in the shape of a fractal Sierpinski carpet. The fractal geometry proves that PDMS microfluidic channels produce the fine feature dimensions desired during graphene oxide deposit. Thermal reduction then reduces the graphene oxide into a purified state of graphene. Issues arise during thermal reduction because of excessive oxygen content in the furnace. The excess oxygen results in devices burning and additional oxidation of the gate contacts that prevents good electrical contact to the gates. Zero bias testing shows that the graphene oxide resistance decreases after thermal reduction, proving that thermal reduction of the devices occurs. Testing confirms a fabrication process producing graphene electronics; however, revision of processing steps, especially thermal reduction, should greatly improve the yield and functionality of the devices.
33
Moutot, Lionel. "La fabrication de l'homme rationnel". Lyon 3, 2005. http://www.theses.fr/2005LYO31013.
Testo completoAbstract (sommario):
Les analyses présentées ici relèvent de la philosophie des sciences, au sens où l'expression est aujourd'hui communément admise, c'est-à-dire de l'étude et de la réflexion portant non seulement sur les méthodes de la science mais aussi de ses objets, de ses fondements, de son histoire et de sa logique. La problématique à laquelle on s'est attachée est la suivante: quel est le rôle et le statut du raisonnement par analogie dans la découverte scientifique ? Ce travail a pour objectif moins l'analyse de la construction d'une image rationnelle de l'Homme dans les sciences au XIXe siècle, que l'étude de l'identification de la figure de la rationalité à l'Homme. Le cycle 1860-1914 sera privilégié, sans exclusive. Le cadre de notre travail est donc celui de l'image et du statut épistémologique de l'analogie comme méthode, dans la perspective d'un dépassement des oppositions entre fondement et expérience, genèse et causalitéThe 20th-century debate: Positivists versus historian s In the mid-20th century, debate in the philosophy of science became notably detailed, elaborate, and critical; those 50 years, in fact, have seen the subject finally achieving the status of a well-established professional discipline. Not least among the causes of this development have been the profound changes that have taken place since 1900 within theoretical physics and other fundamental branches of natural science. These analyses are based on the problem of rationality: what is the importance on analogical system, in the discovery of science
34
Moutot, Lionel Beaune Jean-Claude. "La fabrication de l'homme rationnel". Lyon : Université Lyon 3, 2006. http://thesesbrain.univ-lyon3.fr/sdx/theses/lyon3/2005/moutot_l.
Testo completo
35
Chiang, Yu-Hang, e 江郁航. "Fabrication Marks". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/56yhcq.
Testo completoAbstract (sommario):
碩士國立臺南藝術大學
應用藝術研究所
105
This introduction details the creative path I have taken since entering graduate school in 2013. The title of my thesis is “Fabrication Marks.” In Chinese the word “fabrication” is made up of two Chinese characters - “Yi” and “Zao” - that collectively signify the crafting of a subjective idea and the fact that my work is a product of the interplay between imagination (Yi) and creation (Zao). In this context, “marks” refers to the traces left behind when forging steel using a hammer. These markings are repositories of the emotion and physical effort expended and their accumulation through repetition which enables the object to take shape. Such marks involve not only the tiny, sharp nicks left on the surface of the metal from shaping, but also physical body images and symbols displaced as part of the piece. The thesis is divided into three chapters. Chapter one “Primitive Body” opens with my university graduation work. Although the human body has an inviting appearance, it is ultimately a layer of lifeless skin. I am much more interested in the unknown and mysterious realm beneath. By exploring the invisible organs, and desires of the body I reflect on the real self. In chapter two, “Marked Body,” I strive to imbue the metal with inner negative feelings and pain through the raising process, while also discussing two artists whose works are similarly infused with a powerful sense of melancholy. Chapter three “Body and Container” departs from past creative types and experiments with previously unseen household vessels. The semi-closed nature of the pieces makes them an intriguing metaphor for the human body, the obscured inner space reminding us or our own voyeuristic desires. I compare the outlines of the containers to the contours of the body, simultaneously recording the flow of spirit and strength that defines the work process.
36
Garvey, Carrie Resicky. "Foliage and fabrication /". 2006. http://hdl.handle.net/10156/1323.
Testo completo
37
Tsai, Chieh-Hsiu, e 蔡杰修. "Fabrication of Microneedles". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/58352957795538037886.
Testo completoAbstract (sommario):
碩士淡江大學
機械與機電工程學系碩士班
94
This research paper was performed to study and utilizes two kinds of materials which matches with two different fabrications in order to design an ideal shape of microneedles. The technology employs the polymer microneedles and the silicon microneedles with the height 236 μm and 350 μm respectively. Moreover, the transdermal drug delivery investigation will be conducted through the experimental results to estimate the feasibility of microneedles. Interestingly, the polymer microneedles utilizes molding structure of silicon wafer which uses V-groove by KOH anisotropic wet etching. The SU-8 negative photo-resist has been introduced for the subject structural material of the microneedles, and utilizies photolithography to take and form a shape. Silicon microneedles utilizes silicon wafer as a substrate to manufacture by KOH etching solution, solely depending on controlled etch time and the principle of Fast-etching planes help to fabricate successfully.
38
Chang, Man-San, e 曾文山. "Fabrication of Spaces". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/02015203333988304231.
Testo completoAbstract (sommario):
碩士國立成功大學
建築學系碩博士班
93
This thesis proceeds to carry out a theoretical design focusing on the mechanism of space production by braiding methodology to establish the underlying unfolding theory of form-making, and to provide a number of examples demonstrating the design system based on the theory. This thesis is consisted of four parts: 1. Observation describing the integration of architectural structure and braiding work 2. Principles explaining the constructional logics of braiding methodology 3. Exercise exploring the form-making capacity of braiding methodology 4. Examples demonstrating the spatial characteristics of architectural works done by braiding methodology Through designed exercises and debates, we conclude: Braiding methodology is a “data-driven” type of space production system, which is composed of three elements: wringing, swirling, and locked strands. They are involved in the essential issues: “inner order,” “number of resolution” and “location,” of form-making in braiding methodology. As mainly establishing interaction of sliding and friction between two connected objects, braiding provides a dynamic equilibrium form-adjusting mechanism. This gives designers more freedom to manipulate line order and space-formation in their works. Space created based on the prospective of braiding is characterized by integrity, multiple levels, and simple order in structure. It also possesses the esthetic quality with both simplicity and diversity. Keywords: form-making ,design theory and method, braiding, dynamic equilibrium
39
Yan, Chang Jun, e 張鈞硯. "GaN Photodetector Fabrication". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/94821981801865622822.
Testo completoAbstract (sommario):
碩士國防大學理工學院
電子工程碩士班
101
The Characteristics of the metal-semiconductor-metal (MSM) photodetector with different epitaxial structure were mainly discussed in this paper. One is gradual-buffer MSM structure, the other is MSM with step buffer structure. Both two samples’ P/D ratio and responsibility were compard, and MSM with and without capping layer in step structure were also analyzed. For step buffer structure of fine epitaxial quality, a band discontinuity with obvious barrier height can lower dark current and promoted photocurrent/dark ratio. A Filter layer of Mg0.44Zn0.56O deposited on electrode applied to a wavelength-selection photodetector. It’s a thin film with high resistance and wide band gap of about 4.4eV which cut-off wavelength was suitable for specific designed absorption wavelength. For thin film materials of Mg0.44Zn0.56O analysis, the transmittance of thin film was measured after high temperature annealing and XRD analysis found that Bragg’s angle changed from 34.42 ° right shift to 35.3 °. Composition of thin films was also examined by EDS . For conventional photodetector, Mg0.44Zn0.56O with the effect of passivation layer can effectively lower the dark current about three orders in magnitude, and the current contrast ratio can be achieved level of 1.27×105. Metal-semiconductor-metal structures have the original advantages of low stray capacitance, and in this paper Mg0.44Zn0.56O thin film appropriately deposited will decrease the capacitance value about one order in magnitude. The response time was improved due to low leakage current caused by diffusion capacitance decreasing and less interface defects.
40
Hsieh, Yu-Hsin, e 謝郁新. "Fabrication of microlens". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/um2mgh.
Testo completoAbstract (sommario):
碩士國立東華大學
光電工程學系
106
In this thesis, we will fabricate specially arranged spherical/aspherical microlens arrays. We will observe surface morphology and feature sizes of microlens arrays made by different manufacturing processes, and investigate the influences of parameters of microlens arrays on optical properties and efficiencies of low-color-temperature candle-like organic light-emitting devices (OLED). Four different manufacturing processes will be proposed in this thesis: photolithography, diffuser lithography, tilt lithography, and composite lithography (combined with diffuser lithography and tilt lithography). For the photolithography and diffuser lithography, we study the influences of the diffuser film on the gap, fill factor, and surface morphology of the produced microstructures. In the tilt lithography experiment, we used an additional Fresnel lens on the photomask to make tilt microstructures. Final, in the composite lithography experiment, we successfully make tilt microlens arrays, having a fill factor of 77%. The tilt microlens array can improve the luminous current efficiency and luminous power efficiency of a low-color-temperature candle-like OLED up to 19% and 32.7%, respectively
41
Shih, Ji-Jheng, e 施繼正. "Mold Fabrication and Nanoimprint". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/24214079882942995258.
Testo completoAbstract (sommario):
碩士國立臺灣大學
生物產業機電工程學研究所
93
The project is aimed at developing the mold fabrication and the imprinting recipe for nano-imprint (NIL). For fabrication of a nano-imprinting mold, the electron beam lithography and ICP(Inductively Coupled Plasma) dry etching will be mainly employed to structure the mold of high aspect ratio. As for the nano-imprinting process, the hot-embossing will be employed, and the molds will be tested to form the nanopatterns, and then replicate the pattern to the polymer on the substrate.
42
Chueh, Ming-Chu, e 闕明珠. "Fabrication of Microlens Array". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/76824892751748328154.
Testo completoAbstract (sommario):
碩士國立中央大學
機械工程研究所
93
This project presents a concept to fabricate micro-optical devices using high-aspect-ratio lithography, extra-hardness electroplating, and hot embossing processes. A bath of electroplating electrolyte will be formulated to fabricate micro-optics mold inserts with extra-hardness Ni-Co alloy. It is a novel method to increase the life of the mold insert during fabricating micro-optical devices. With this high hardness, the mold inserts can resist high abrasiveness and wear so as to extend the mold cycle life and reduce the idle time of replacing mold plates during fabrications. Therefore, the process of fabrications of micro-optics can be more cost-effective. In this study, different thicknesses of photoresist AZ4620 will be tried for micro-optical templates with different radiuii. Also, parametric effects of reflow time, and temperature on micro-optical profiles will be characterized and discussed as well. Finally, the optical properties such as focal length of developed micro-optics will be measured and tested.
43
Yung-ShengWang e 王永昇. "Fabrication of InGaAs Photodetectors". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/76476744949012157516.
Testo completoAbstract (sommario):
博士國立成功大學
微電子工程研究所碩博士班
98
The main goal of this dissertation is the fabrication and analysis of InGaAs/InP photodetectors growth on InP substrate by metalorganic chemical vapor deposition (MOCVD). The dissertation is divided into two parts, one is the investigation of long-wavelength quantum well infrared photodetectors (QWIPs), and the other is that of P-I-N infrared photodetectors for optical communication. In the beginning of this dissertation, Ten-periods InxGa1-xAs/InP quantum-well infrared photodetectors (QWIPs) with and without compressive strain in the quantum-well region growth on SI-InP substrate were investigated. At a detection wavelength of 8 um, a high responsivity of 20 A/W is observed for the unstrained device, which is attributed to the higher gain of the InP-based material than that of the GaAs-based material and peak detectivity of 1.5×1010 cmHz0.5W-1 at 1.8V. Compared with the unstrained QWIP, the InGaAs/InP QWIP with 1% compressive strain (CS) in the QWs has demonstrated three orders of magnitude dark current depressions so that higher peak detectivity of 2.9×1010 cmHz0.5W-1 at 1.3V is observed for the device. For the 2.5 Gb/s optical communication, with -5 V applied bias, it was found that dark current and capacitance of the photodiode were 105 pA and 0.475 pF, respectively with 60 μm diameter for conventional InGaAs P-I-N photodetector, which corresponds to quantum efficiencies of 71.9 and 93.6%, respectively at 1.3 ?m and 1.55 ?m. For a given bandwidth of 1 kHz and a given bias of -5 V, it was found that noise-equivalent-power (NEP) our InGaAs PIN photodiode were 4.53×10-14 W at 1.3 ?m and 2.95×10-14 W at 1.55 ?m, which correspond to normalize detectivity (D*) values of 3.69×1012 cmHz0.5W-1 at 1.3?m and 5.67×1012 cmHz0.5W-1 at 1.55 ?m. Furthermore, for 10 Gb/s application, InGaAs-based buried heterostructure photodetector (BH-PD) was proposed and fabricated. By introducing etching and refilling lower concentration semi-insulating InP, it was found that we can reduce the capacitance of the P-I-N PDs by 33% compared to conventional process. Finally, with -5 V applied bias, it was found that dark current and capacitance of the photodiode were 21.5 pA and 0.267 pF, respectively with 50 μm diameter for buried heterostructure photodetector (BH-PD), which corresponds to responsivity of 0.72 and 1 A/W, respectively at 1.3 ?m and 1.55 ?m. For a given bandwidth of 1 kHz and a given bias of -5 V, it was found that noise equivalent powers our InGaAs P-I-N BH-PD were 6.05×10-14 W at 1310 nm and 4.36×10-14 W at 1550 nm, which correspond to normalize detectivity (D*) values of 2.3×1012 cmHz0.5W-1 and 3.2×1012 cmHz0.5W-1, respectively. It was also found that show a clear eye-opening feature and are well operated at 10 Gb/s from the proposed BH-PD met with the requirements of the OC-192 standard.
44
Hung, Shao-Kun, e 洪紹鯤. "Data Mining in Fabrication". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/53812968745067968133.
Testo completoAbstract (sommario):
碩士國立臺灣科技大學
電機工程系
88
Data mining is a wide-used knowledge. Many algorithms had been developed from the last years, such as Association rule, Classification, Clustering, OLAP, Decision tree, Neural network and Genetic algorithms [1] etc. The usage of data mining includes all trades and professions, such as the fabrication, financial investment, transaction of credit cards, astronomical technology and service trade etc. We will discuss the usage of data mining in the fabrication of semiconductor. Although there are many reasons to affect productivity, we think that the associations of the machines will one of the reasons to affect the productivity. The main issue of our paper is how to use this knowledge to promote the productivity. In order to prove our idea, we design an algorithm to solve this problem. First, we keep the record of product line, including every step of machine number and some other parameters and process the data with our algorithm. We could get the data that processing by our algorithm. With the data we can judge the association of machine that are special well or bad. Next time when scheduling, we could avoid the bad association, or take use of the well association.
45
Fang, Ting-Chi, e 方廷旗. "Fabrication of Valveless Micropump". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/40732842626700939432.
Testo completoAbstract (sommario):
碩士淡江大學
機械與機電工程學系碩士班
98
In this research we the concept that the ultra sound flap to concuss, with have no valve door the concept that become weak pump unite as one to gather two A Ji silicon oxygens alkanes(PDMS) and glass material as main structure and manufacture a have no valve door become weak pump.Constituting can be divided into glass tiny flow way(have to gradually shrink/gradually piece the glass chamber of the tube body) and PDMS the import and export connector and miniatures SU-8s turn son''s etc. part of.For simplifying the number of PDMS coalescence, this research only covers glass in the green light up process tiny flow a way, past how slice(undercut) the bottom that the glass eclipse engrave the phenomenon decline to least, is an initial consideration.Up and down arouse to flap by in addition ultra sound after completing a component construction secondly, observe the condition that the miniatures SU-8s of different leaf''s number turn a sub- inducement operation. This kind of tiny pump design contains many advantages, the structure is simple, the production cost is low and have good living creature compatibility, and drive don''t need complicated controller.Initial detection:The 28 khzs above ultra sound flaps to concuss, can immediately drive this to become weak miniature within pump to turn son and turn soon at least to 4.4 RPMs without the valve door.
46
Wei, Jhih-Ci, e 韋志棋. "Nanophotonics Plasmonic Device Fabrication". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/62460356224127907116.
Testo completoAbstract (sommario):
碩士國立臺灣大學
物理研究所
96
In this thesis, we use the helium-Neon laser with wavelength 633nm, and focus the laser to phase-change thin film Ge2Sb2Te5 by high magnification and high number aperture oil objective lens(100x, NA：1.4). By controlling the high precision piezo nano-stage, we can fabricate any crystalline two-dimensional structure. The experimental results shows that we can fabricate the circle array, chiral structure, 2-D spiral structure, and checker board structure. By using the same experimental setup, we replace the red light laser with femto-second pulse laser. We can use non-linear optical effect ,two-photon absorption. Because the light source have good three dimensional spatial selectivity for commercial photo-polymerization resin, we could manufacture any three dimensional structure. We also can improve the material to fabricate the two-dimensional metallic structure. It is a challenge to fabricate the three dimensional metallic structure. This method can apply to the research of Plasmonic Meta-material , and maybe it is a tool to fabricate the commercial plasmonic optical device in the future.
47
SHIH, WEI-CHUAN, e 石為穿. "Micromotor Design and Fabrication". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/10157716736304525471.
Testo completoAbstract (sommario):
碩士國立交通大學
機械工程系
87
This thesis focuses on the design and fabrication of micromotors. By using the surface micromachining technique, we designed and fabricated an electrostatic side-drive wobble micromotor based on Deng's geometric design.. Moreover, we also made improvement on her design and process. There are two major new ideas: the first is the fabrication of the etching stop which protects the bottom of the anchor from being damaged during releasing. With this etching stop, an additional electric path from the rotor to the substrate is also established. This electric path is always effective and would reduce the potential difference between the rotor and the substrate. The second is the 1 mm bearing clearance composed by a mixed-layer, a wet oxide and a PECVD oxide layer. The former has the advantage of high conformality while the latter consumes no polysilicon. This thick bearing clearance can solve the interlocking problem posed by the non-uniform RIE process and may induce a lift force on the rotor. Due to the efforts on process and the modified design, we fabricated a micromotor with the free moving and separated rotor, the stator, and the bearing connecting the rotor and the anchor. But because of the low performance of the RIE machine we've used, the sidewalls were not vertical as expected. Improvement on this process step is required. In addition to the design and the fabrication process, we also followed Trimmer's derivation and established the torque model for our micromotor geometry. By this model we can estimate the driving torque of the micromotor under ideal operation conditions.
48
李子琦. "Fabrication, characterization and thermal". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/73214191114576599319.
Testo completo
49
Huang, Kai-Chi, e 黃凱祺. "Digital Bending Wood Fabrication". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/36508339852684789835.
Testo completoAbstract (sommario):
碩士淡江大學
建築學系碩士班
104
It has been a long time that wood is applied to architecture, thus wood is a kind of ancient building material. With the increase of designers’ understanding of material over time, they began to try multiple methods for bending and processing wood. These methods contain controlling and re-interpretation of material characteristics, and even refer to untraditional material treatment violating material characteristics. In the CAD environments, designers can look for more interesting form and composition through the CAD method without considering gravity and material characteristics, even without considering building functions and scales. How to apply a 3D model on the screen to the real world and present it to people through materialization is an issue that many digital design researchers are making continuous efforts to realize. Therefore, the issue discussed by the research is to develop a wood processing method different from the past one by means of referring to traditional bent wood crafting and combining with current CAD and manufacturing technologies. The research mainly operates and discusses designs of three sizes (small, medium and big). For small-sized works, it first designs a bent wood 3D computer concept model through Rhinoceros modeling software, and manufactures the model through laser cutting. During the process, computer simulation and material processing are operated alternately, to make both generate reasonable relevance. For medium-sized works, it mainly utilizes the traditional bent wood crafting skill to manufacture multiple prototypes of bent wood. In crafting discussion, different skills and prototypes are considered how to have parametric applications are designed. It utilizes prototypes in medium-sized research work, cooperates with Grasshopper, the plug-in of Rhinoceros software, to adjust and correct parametric design, and practically manufactures and builds a full-scale pavilion about 3 meters high. In the field of past bent wood crafting, different processing methods will generate different construction details, further to generate different types of outcomes. The research presents the crafting through digital design and digital manufacturing. During the research process, it is found that the technology combined with digital can generate products of bent wood with different crafting method. Through design and construction of the pavilion, it can be learnt that many design schemata that cannot be imaged and practiced in the past are researched and realized today due to the improvement of digital software and hardware.
50
WU, YI-FAN, e 吳易凡. "Fabrication of tracheal stent". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/30107106525363073475.
Testo completoAbstract (sommario):
碩士國立中興大學
生命科學院碩士在職專班
91
Although stent has been playing a very important role in tissue engineering, researches focused on lumen stent are still not found many. This study involves wide fields in ranging from the analysis of patent map, mold design and evaluation as to fabricating stents, mechanical property test and animal experiments, which is not only discussing a manufacture process but also trying to practically improve the caring quality in clinic. One-step process that is different from and proved to be more economical than conventional cross-linked silicon process has being revealed in this work, as well as a short-shot method of injection molding has being recommended and written in plainly terms in stead of experiences passed by words without references；this study may meanwhile directly benefit freshman that always traces back and analyzes other people’s experienced injection conditions without any clue. In order to further explore the research of tracheal cells migrating on stent, nano-groove on mold would have been fabricated yet micro-groove has so far practically done. In addition, treatment of longitudinal grinding and finishing on mold is actually abnormal in treating sliders of mold, whereas products fortunately presented smoothly release from the molds. Moreover, in spite of the fact that tracheal stent demonstrated migration in trachea of outgrowth pig and the effect of implanting stent onto animal seems not functioning well, the experience of animal experimental model and differential operations between animals and human beings still may give good advices to those who are working on animal experiment or operation in clinic at present and in the near future.