Fabricating and 3D printing gamepads is challenging not only in terms of appearance of them but also in terms of their physical validity and user experience that they might provide. This thesis addresses the issue of providing users the ability to hold in their hand a fabricated gamepad, which is an object similar to that the virtual character keeps in his/her hand inside the virtual world. Thus, this thesis presents a basic approach for converting 3D objects found in a variety of online datasets to functional gamepads by retargeting the structure of the gamepad’s buttons to the 3D model. The fabricated gamepads can then be used by gamers to enjoy their favorite game. The authors assumed that gamepads that have a relationship with the game enhance the game experience of users. This assumption is mainly based on a variety of previous work that investigates the use of “natural” interfaces. Therefore, in addition to the proposed approach, a two-part user study was also conducted to firstly understand whether the fabricated gamepads can be considered as valid physical objects and also to understand the way that participants experienced a game. First, the results indicated that the fabricated gamepads can be considered as valid physical objects and secondly, that they enhance the gaming experience of the users.

The ink transfer mechanisms in the offset lithographic printing process is consisted by a complex inking roller train which a series of alternately rigid and deformable rollers, are used to precondition and deliver the printing fluid from the ink and fount reservoirs to the image carrier. The lithographic printing inks are complex formulated non-Newtonian fluids with high viscoelastic rheological profile and thixotropic behaviour. A set of ink dilutions was produced based on coldset lithographic printing ink diluted in concentration with Butyl-Diglycol. The rheological profile of the produced inks was examined by detailed rheological characterisation with particular interest on viscosity on tack, thixotropy, viscoelasticity, surface tension, extension and shear viscosity. Further examination established the relationships between shear viscosity and tack focusing on a printing nip between a rigid and elastic roller. A decrease in tack was found to be associated with a decrease in shear and the apparent extension viscosity. Developed imprinting and photographic techniques used to capture and characterise the fundamental phenomena of ribbing and misting associated with ink film splitting at the rollers nip in offset printing. Such techniques used to capture the dynamic profile of those mechanisms on a closed loop distribution system by using a tack meter. The detailed profile of those phenomena was characterised with particular interest on the relationship with the fluids rheological profile and the Capillary number. Extension rheometer was also used to analyse the mechanisms of ribbing and misting phenomena by experimental simulation of a printing nip. A factorial experiment was undertaken based on LI8 Orthogonal Array techniques. The parameters of rollers ratio, ink film thickness, temperature, distribution speed, distribution time and inks viscosity were found to have an influence on misting and ribbing phenomena. Results and analysis established responses and interactions between the process parameters but also between ribbing and misting as essential phenomena with the ink transfer mechanisms in lithographic printing process.

abstract: This research work demonstrates the process feasibility of Ultrasonic Filament Modeling process as a metal additive manufacturing process. Additive manufacturing (or 3d printing) is the method to manufacture 3d objects layer by layer. Current direct or indirect metal additive manufacturing processes either require a high power heat source like a laser or an electron beam, or require some kind of a post processing operation to produce net-shape fully-dense 3D components. The novel process of Ultrasonic Filament Modeling uses ultrasonic energy to achieve voxel deformation and inter-layer and intra-layer mass transport between voxels causing metallurgical bonding between the voxels. This enables the process to build net-shape 3D components at room temperature and ambient conditions. Two parallel mechanisms, ultrasonic softening and enhanced mass transport due to ultrasonic irradiation enable the voxel shaping and bonding respectively. This work investigates ultrasonic softening and the mass transport across voxels. Microstructural changes in aluminium during the voxel shaping have also been investigated. The temperature evolution during the process has been analyzed and presented in this work. / Dissertation/Thesis / Masters Thesis Engineering 2016

Made available in DSpace on 2014-06-12T15:51:13Z (GMT). No. of bitstreams: 2 arquivo1504_1.pdf: 791063 bytes, checksum: 4a11c48c67eb0f30d0a7814f389f14a4 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2009 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / A necessidade de métodos mais versáteis para a mensuração e monitoramento dos níveis séricos de lipídios tem estimulado a produção de uma grande variedade de novos métodos analíticos. O presente trabalho mostra o desenvolvimento de um biossensor monoenzimático para detecção de triglicerídeos empregando a tecnologia de Screenprinting através da qual, foram impressos os eletrodos de referência (Ag/AgCl) e o de trabalho contendo uma mistura de carbono e quitosana. A lipase foi imobilizada por adsorção no eletrodo de trabalho. A lipase solúvel, usando pNPM, apresentou pH ótimo de 8 e temperatura ótima de 32,5°C, mantendo cerca de 78,5% da atividade máxima a 25°C (temperatura operacional do biossensor). O Km e Vmáx para a lipase solúvel em relação ao pNPM foram de 0,95 mM e 25,51 U/mg proteína, respectivamente. No biossensor desenvolvido com apenas lipase imobilizada, usando trioleína como substrato, foram de 0,148 mM e 262,21 μA/s e 0,304 mM e 85,07 μA/s para a lipase solúvel e TIP sem enzima. Os resultados mostraram linearidade nas respostas de correntes para trioleína (0,25mM 2mM), atestando a viabilidade do biossensor desenvolvido, utilizando unicamente a lipase imobilizada na superfície do eletrodo de trabalho, podendo ser empregado eficientemente para a detecção de triglicerídeos

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.

The purpose of this masterś thesis is to create business plan and prove long term prosperity of mentioned. Business plan involves into two industries, the first is polygraphy industry and second is modern online budiness. Business plan of company Printaxe.com is startup. This masterś thesis is dividi into two main parts. One is theoretical and the second is practical. Theoretical contains the very basic informations about entrepreneurship and practical contains methodology written in theoretical part. Printaxe.com is solution consisted of online marketplace and generator of ideal customerś products for sell.

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Organ-on-chip models are a rapidly evolving and promising tool for studying human physiology and disease and developing therapeutics. However, due to the lack of fabrication processes of pertinent precision to deliver well-defined architectural and mechanical elements, organ-on-chip models have been limited in recapitulating structural and biomechanical features of many tissues, which has impeded the modeling power and clinical relevance of these tools. The elusive in vitro replication of the pumping function and mechanical loading of the human heart, an outstanding instance of a structurally and mechanically complex physiological system, exemplifies the need for stronger fabrication processes. In this work, we investigated the potential of two-photon direct laser writing (TPDLW), an emerging high-precision fabrication technique, in enabling the generation of structurally and biomechanically complex organ-on-chip models. We first identify the functional principles, advantages and limitations of TPDLW, and review existing applications of TPDLW for in vitro studies. Inspired by the fabrication versatility of TPDLW, we then engineer a microfluidic cardiac pump powered by human stem-cell-derived cardiomyocytes (hiPSC-CM), aiming to replicate the ventricular pumping function on a chip by constructing miniaturized analogues of the functional elements of the human heart. We specifically fabricate a microscale metamaterial scaffold with fine-tuned mechanical properties to support the formation and cyclic contraction of an unprecedentedly miniaturized induced pluripotent stem cell derived ventricular chamber. Furthermore, we fabricate microfluidic valves with extreme sensitivity to rectify the flow generated by the ventricular chamber. The integrated microfluidic system recapitulates ventricular fluidic function and exhibits for the first time in vitro all phases of the ventricular hemodynamic loading pattern. Finally, we demonstrate a technique of increasing the fabrication output of TPDLW that could enable its broader adoption. Together, our results highlight the potential of high-precision fabrication in expanding the accessible spectrum of organ-on-a-chip models towards structurally and biomechanically sophisticated tissue architectures. This dissertation is accompanied by a set of supplementary videos depicting the results of our experimental efforts. Movie 1 shows a cardiac tissue beating on an inverted hexagon scaffold. Movie 2 shows a compressive test on helical scaffold that is later embedded in a cardiac tissue. Movie 3 show a beating cardiac chamber on helical scaffold that can generate measurable flow. Movie 4 shows a functional suspension valve that is later embedded in the device with the cardiac chamber. Movie 5 shows the function of a suspension valve that rectifies oscillating flow. Movie 6 shows that the same suspension valve can rectify flow of increasing frequency. Movie 7 shows that the combined chamber and valves exhibit directional flow. Finally, movie 8 shows that the addition of afterload in the combined system leads to the emergence of isovolumetric phases. / 2023-09-24T00:00:00Z

OBJECTIVE: This study aims to compare the flexural strength and color stability of conventional, machined, and printed dental polymers. Secondarily, the effects of aging, fatigue, coffee, distilled water, and UV light on the color stability and flexural strength of the different dental polymers will be evaluated. MATERIALS AND METHODS: Sixty disks 14mm in diameter and 2mm in thickness were fabricated from each of the following polymers: Jet Tooth Shade (Lang Dental), ProTemp (3M-ESPE), Telio CAD Temp (Ivoclar Vivadent), Vita CAD Temp (Vita), Temporary CB (FormLab), Dentca (Dentca), and Bego VarseoSmile Crown Plus (Bego). The sixty disks from each polymer were then divided into the six following groups: no treatment, thermocycling, fatigue, thermocycling and coffee, distilled water and finally UV Light. Prior to any treatment, the color coordinates CIE L*a*b*, were registered first. The non-treated groups were fractured using the Instron Universal Testing Machine to obtain flexural strength values. Thermocycling consisted of placing the specimens in 30 seconds 5°C water and then 30 seconds in 55°C water for 5,000 cycles. Fatigue testing consisted of cyclic loading the disk specimens by calculating 60% of the mean load to failure from the non-treated group and subjecting them to 50,000 cycles. The third group was placed under thermocycling for 1,500 cycles and then placed in coffee for 15 days. Another group was placed in distilled water for 15 days. Finally, the UV light treatment consisted of exposing the disk specimens to UV light for ten hours over the course of five days. After treatment, the color coordinates were recorded again and fractured using the Instron Universal Testing Machine. The data was analyzed for any statistically significant differences using ANOVA with a<0.05. RESULTS: The flexural strength values were highest for Telio CAD Temp, that was affected only by UV light via a statistical analysis. ProTemp was second highest followed by Bego VarseoSmile Crown Plus, Dentca, Temporary CB, Vita CAD Temp and finally Jet Tooth Shade. Color differences were highest for Dentca followed by Jet Tooth Shade, ProTemp, Telio CAD Temp, Temporary CB and finally Vita CAD Temp. UV light and thermocycling/ coffee had the highest impact. CONCLUSION: Telio CAD Temp had the highest overall flexural strength and was resistant to all post fabrication treatments except for UV light. ProTemp had the second highest overall flexural strength but was susceptible to multiple post fabrication treatments like distilled water, fatigue, and aging. The printed specimens had flexural strength values lower in the middle range of all tested materials. In terms of treatment, UV light and coffee/thermocycling had the biggest impact on the overall color stability values. Powder and Liquid based PMMA had the lowest overall flexural strengths.

<p>In this thesis, I present three research topics in the areas of scanning and printing.</p><p>The first topic is on detecting and removing specific artifacts in images scanned using</p><p>sheetfed scanners. Sheetfed scanners are widely used for scanning stacks of loose pages at</p><p>high speed. The scanhead in the sheet-fed scanners is stationary and the pages are fed with</p><p>an automatic document feeder. When dust particles get stuck onto the scanner glass, they</p><p>reflect the incident light and cause vertical streaks in the scanned images. These artifacts are</p><p>known as dust streaks. I have developed a method for detecting and healing dust streaks.</p><p>The second topic is on motor control system and test page design for inkjet printers.</p><p>Motor control consists of two main parts which are movement of the printhead in the scan</p><p>direction and the process direction. Scan direction movement needs to have a constant</p><p>smooth velocity in order to avoid banding artifacts. Process direction movement needs to</p><p>advance an exact distance in order to avoid misalignment. The full procedure for implementing</p><p>the motor control on a microcontroller, determining optimal parameters, and designing</p><p>test pages for validating the motor control system is presented.</p><p>The third topic is on printer model based halftoning and print mask design using DBS.</p><p>Inkjet printers can fire nozzles at specific pixel locations. Due to nozzle clogging and nonuniformity</p><p>in the nozzles, inkjet printers usually print in the multipass mode to reduce print</p><p>artifacts. In this mode, the printhead goes over the same line more than once with different</p><p>sets of nozzles of the same ink. Print mask determines which pixels are printed at a certain</p><p>pass and which pixels are not printed. I developed a printer model to predict prints and</p><p>also developed test pages to obtain parameters for the printer model. Then, we looked into</p><p>model based halftoning and print mask design using the direct binary search algorithm. In</p><p>addition, I investigated the advantages and disadvantages of using light magenta as opposed</p><p>to using black ink in 4-color printing.</p>