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Cerit, Bülent. "Technology investment strategy based on technology roadmapping." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438445.
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Murphy, Maureen T. "Knowledge-based technology transfer." Thesis, University of Ulster, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386271.
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Matsuzaki, Yuichiro. "Robust measurement based quantum technology." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540143.
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Kubovic, Michal. "Technology for diamond based electronics." [S.l. : s.n.], 2009. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-66731.
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Savioz, Pascal. "Technology intelligence in technology-based SMEs : conceptual design and implementation /." Zürich : Verl. Industrielle Organisation, 2002. http://www.gbv.de/dms/zbw/349776881.pdf.
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Bosques, Edelmira. "Biohazard neutralization based on lipid technology." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/1771.
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A rapid detection and neutralization method for biowarfare agents would be a great biodefense in war times. With this purpose, liposomes were developed following the lipid film formation, rehydration, and extrusion procedure as the production method. MgOCl2 was encapsulated in the liposomes and it was tested with three different bacterium B. cereus; B. thuringiensis; and B. subtilis. For specificity, the liposomes were modified with a polyclonal antibody against B. cereus and B. subtilis. The liposomes were characterized using a Malvern Zetasizer Instrument, and the study revealed stability of the liposomes stored at 4°C for a period of 15 days. A live/dead assay revealed a significant reduction of bacterium incubated with MgOCl2-liposomes. Smaller reduction percentages, but yet significant, were observed with the MgOCl2-immunoliposomes. A colony growth assay revealed a significant reduction percentage for empty liposomes, MgOCl2-liposomes, and MgOCl2-immunoliposomes incubated with B. thuringiensis.
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Ewing, John Paul. "Teacher language towards computer-based technology." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0010/NQ59584.pdf.
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Low, Y. W. "Germanium based technology for intergrated circuits." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546380.
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Montague, Nicholas Patrick. "Development of CPMV-based particle technology." Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439927.
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Ghosemajumder, Shuman 1974. "Advanced peer-based technology business models." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8438.
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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management, 2002.Includes bibliographical references (leaf 58).
The mass adoption of the Internet and the creation of digital standards for the storage of information goods ( e.g. written documents, audio recordings, videos) has allowed individuals to exchange these goods with one another on an international scale with essentially no marginal cost. This phenomenon has been accelerated by the rise of peer-to-peer (P2P) file sharing systems. which provide a public marketplace for the express purpose of finding and exchanging these goods. Napster was the first such system, and is still the most famous, but its demise has been followed by the ascendance of more powerful systems such as KaZaA, Gnutella. and Freenet - which now boast more aggregate users than Napster ever had. This thesis examines the social behaviors, economic ramifications, legal issues, and technological developments which are the results of this ultimate form of disintermediation. It concludes by proposing a strategy for the effective commercial distribution of information goods in a world of free exchanges. The recording industry is examined most closely, since this is the industry with the most copyrighted content available on these systems. Primary data has been collected from 23 interviews with industry representatives, technologists and end users plus 206 questionnaires from end users alone. An additional 1141 questionnaires were administered anonymously via the Internet for comparison. The results indicate that a viable business model requires several responses to current trends. The qualitative model proposed in this thesis consists of three strategic complementarities: I . A new pricing model. 2. A commercial file sharing standard. 3. A strategy for minimizing the negative impact of free exchanges. The suggested format for each of these actions is examined. It is argued that all three responses are crucial for the online success of any information goods industry, and that an incomplete solution will be rejected by consumers.
by Shuman Ghosemajumder.
M.B.A.
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Alayan, Amal Muhammad Musa. "Strategies for technology-based economic development." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/35362.
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Cabral, Diogo Nuno Crespo Ribeiro. "Video interaction using pen-based technology." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/11503.
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Dissertação para obtenção do Grau de Doutor em
InformáticaVideo can be considered one of the most complete and complex media and its manipulating is still a difficult and tedious task. This research applies pen-based technology to video manipulation, with the goal to improve this interaction. Even though the human familiarity with pen-based devices, how they can be used on video interaction, in order to improve it, making it more natural and at the same time fostering the user’s creativity is an open question. Two types of interaction with video were considered in this work: video annotation and video editing. Each interaction type allows the study of one of the interaction modes of using pen-based technology: indirectly, through digital ink, or directly, trough pen gestures or pressure. This research contributes with two approaches for pen-based video interaction: pen-based video annotations and video as ink. The first uses pen-based annotations combined with motion tracking algorithms, in order to augment video content with sketches or handwritten notes. It aims to study how pen-based technology can be used to annotate a moving objects and how to maintain the association between a pen-based annotations and the annotated moving object The second concept replaces digital ink by video content, studding how pen gestures and pressure can be used on video editing and what kind of changes are needed in the interface, in order to provide a more familiar and creative interaction in this usage context.
This work was partially funded by the UTAustin-Portugal, Digital Media, Program (Ph.D. grant: SFRH/BD/42662/2007 - FCT/MCTES); by the HP Technology for Teaching Grant Initiative 2006; by the project "TKB - A Transmedia Knowledge Base for contemporary dance" (PTDC/EAT/AVP/098220/2008 funded by FCT/MCTES); and by CITI/DI/FCT/UNL (PEst-OE/EEI/UI0527/2011)
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Faulkner-Jones, Alan. "Development of multivalve-based bioprinting technology." Thesis, Heriot-Watt University, 2015. http://hdl.handle.net/10399/3066.
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Pluripotent stem cells (PSCs) are the most favourable sources of cells for tissue engineering applications due to their unique potency and self-renewal characteristics however they are quite fragile and can be directed to differentiate erroneously by the application of external forces. A novel multi-nozzle valve-based bioprinting platform was developed that was able to position droplets of bio-ink – such as cells in suspension – with high spatial accuracy and low impact. Volumes as low as 2 nL were successfully dispensed. Several different versions of the machine were created before the final machine was made integrating improvements and solutions to problems encountered during development. A complete evaluation of cell compatibility was carried out in order to quantify the response of cells to the bioprinting process. In the first ever study of this kind, the viability and pluripotency of human embryonic and induced pluripotent stem cells was investigated post-printing and were found to be almost completely unaffected by the bioprinting process. Many cells require a 3D culture environment in order to maintain their in vivo functions. A hybrid bioprinted-hanging-droplet technique was used to create uniform spheroid aggregates of programmable sizes from PSCs which could be used to direct PSC differentiation or as building blocks for tissue generation. Hydrogels can also be used to recreate the 3D in vivo cellular environment using the bioprinter. Alginate and hybrid polypeptide-DNA hydrogels were used, the latter for the first time with a bioprinting platform. Complex 3D structures could be created in a layer-by-layer approach with programmable heterogeneous properties throughout. Cells were added to the hydrogel precursor solution and used to bioprint 3D structures. The cells were found to be functional and highly viable while being encapsulated throughout the 3D structure of the bioprinted hydrogel which will allow the future creation of more accurate human tissue models. PSCs were successfully directed to differentiate into hepatocyte-like cells. It was shown that the bioprinting process did not interrupt or alter the pre-programmed differentiation of the cells which means that these cells can be patterned in 3D using the bioprinter while differentiating, greatly speeding up the creation of mini-liver tissue. Hepatic stellates and HUVECs were co-cultured with the hepatocyte-like cells in various ratios in an attempt to improve their hepatic function. However, no clear improvement in cytochrome P450 activity was observed indicating that further optimisation is required in this area.
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Compagno, Enrico. "Lattice based low control quantum technology." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10045115/.
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The possibility to designing schemes useful for developing quantum technology devices of practical value necessitates exploiting quantum coherence effects in a scalable physical system in a feasible way. The broad aim of this thesis is to investigate the use of quantum non-equilibrium dynamics for the above, exploiting minimal control to accomplish highly coherent dynamics in a many-body system. How to harness the natural hopping dynamics of particles in a many-site lattice for controlled applications, is still an open question. Through the introduction of few impurities in the lattice potential, we devise a scheme to trigger effective tunable linear optics-like operations between arbitrary sites, that overcomes the limitations of setups based on coherent hopping dynamics, when particles are initially separated by many sites. Our scheme enables the generation of peculiar quantum interference effects as well as quantum metrology applications in a many-site lattice. We design a lattice coupling profile that enables perfect wave-packet splitting between mirror symmetric sites and leads to perfect wave-packet reconstruction, fractional revivals and perfect entanglement distribution, for arbitrary long chains. We prove that composite objects in a lattice, made of more particles initially in a lattice site, are a valuable resource for dynamically generating non-classical states between remote sites, tackling edge-localisation effects via local fields. Finally, we show how the spin independent scattering of two initially distant qubits, can be used to implement an entangling quantum gate between remote sites of a lattice. Our findings have potentially an impact on quantum information, as well as on atomic interferometry in a lattice.
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Bucher, Philip Eugen. "Integrated technology roadmapping design and implementation for technology-based multinational enterprises /." [S.l.] : [s.n.], 2003. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14995.
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Baltynov, Turar. "Innovative approaches for AlGaN/GaN-based technology." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13522/.
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Gallium Nitride (GaN) has been proven to be a very suitable material for advanced power electronics on account of its outstanding material properties. Today, researchers are exploring GaN-based high electron mobility transistors (HEMTs) for conventional as well as high-end solutions in the range of 600 – 1200 V. However, thermal and power density limitations have impeded the achievement of the peak operational capability of AlGaN/GaN HEMTs. GaN-on-Diamond technology has proven to be a feasible solution to reduce thermal resistance and increase power density of AlGaN/GaN HEMTs for RF applications. The work presented in this thesis is focused on the realisation of high-voltage GaN-on-Diamond power semiconductor devices. This goal was achieved through extensive numerical simulations applied to device design, fabrication, and characterisation. The fabricated devices include conventional AlGaN/GaN HEMT design in circular and linear form with and without field plate engineering. The circular GaN-on-Diamond HEMTs with gate width of ~ 430 μm, gate length of 3 μm, gate-to-drain separation of 17 μm and source field plate length of 3 μm have shown breakdown voltage of ~ 1.1 kV. In this work a new concept of normally-off optically-controlled AlGaN/GaN-based power semiconductor device is proposed. A simulation study has been carried out in order to explore the DC characteristics, switching characteristics, breakdown voltage, and current gain of these novel devices. The typical structure comprises a 20 nm of undoped Al0.23Ga0.77N barrier layer, a 1.1 μm undoped-GaN buffer layer and a p-doped region (to locally deplete the electron channel and ensure a normally-off operation). The simulation study shows that the gain and the breakdown voltage of the device are highly dependent on the depth of the p-doped region. At a particular depth of the p-doped region of 500 nm the gain of the device is 970 (at light intensity of 7 W/cm2) and the breakdown voltage is ~ 350 V. The rise and fall times of the device is found to be 0.4 μsec and 0.3 μsec respectively. The simulation results show a significant potential of the proposed structure for high-frequency and high-power applications.
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Cote, Dalton James. "Web-based technology to support medical education." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ34881.pdf.
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Norrman, Charlotte. "Publicly Funded Support of Technology-Based Ventures." Licentiate thesis, Linköping : Univ, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5685.
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Thomas, Sharyn Jane. "The polyvalent properties of dendrimer based technology." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423252.
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Bayraktaroglu, Serkan. "Management agendas for technology-based learning media." Thesis, Coventry University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286773.
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ESCOBAR, SERGIO GUTIERREZ. "HUMIDITY SENSOR BASED ON MEMS SAW TECHNOLOGY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=29753@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROAGÊNCIA NACIONAL DE PETRÓLEO
Os sistemas micro eletromecânicos são dispositivos na escala dos micras que combinam estruturas mecânicas com circuitos elétricos, e são usados como sensores ou atuadores. Dentro destes dispositivos, estão os de onda superficial acústica (SAW em inglês) que usam variações na velocidade ou percurso de propagação da onda para fazer a detecção da variável a medir. Uma aplicação importante em processos químicos, é no acondicionamento de ambientes, monitorando a umidade. Para isso um sensor SAW comprado, foi coberto em sua superfície com uma camada de um polímero absorvente de vapor de agua. No qual o aumento na massa do polímero na superfície diminui a velocidade da onda. Por tanto o PolyVinyl Álcool foi escolhido para absorver o vapor de agua e foi preparado com 5.6 wt por cento, para ser depositado por meio de spin coating. Então uma serie de experimentos foram feitos numa câmara climática variando tanto a umidade como a temperatura, com o fim de avaliar o comportamento do sensor medindo a sua variação da frequência. Estes resultados foram comparados com um modelo analítico e uma simulação por elementos finitos. O modelo analítico foi presentado por Sielman, o qual determina como muda a densidade e espessura no polímero com a umidade. Estes valores foram substituídos na equação de Wohltjen que dá a variação da frequência de um SAW devido a absorção de gases. Em quanto a simulação por elementos finitos foi feita em Comsol Multiphysics achando a frequência para a qual o SAW ressona, com o aumento da densidade na camada acima do SAW para as umidades inseridas.
Micro electromechanical systems (MEMS) are devices that combine mechanical structures with electrical circuits at the micro scale, to function as sensors or actuators. One type of MEMS are the surface acoustic waves (SAW) devices, which uses the surface wave velocity or propagation path variations to measure the variable of interest. One important application in chemical processes is related to environment condition control, specifically humidity measurement. With that purpose, a commercial SAW was purchased and coated with a polymer layer in its surface. The PolyVynil Alcohol (PVA) was chosen to be the sensing layer in the SAW due to water vapor absorption properties, that increases the mass over the surface and decrease the wave velocity, leading to sense this humidity changes. 5.6wt per cent PVA solution was prepared and deposited through spin coating. Therefore, a series of tests were carried out in a climatic chamber, varying the humidity and temperature conditions, with the aim to analyze the sensor behavior by measuring its frequency shift. These results were compared with an analytical model and a finite element simulation. The analytical model presented by Sielman determines how the polymer density changes with humidity. These density values were inserted into the Wohltjen equation, which gives the frequency shift of the SAW due to gas absorption. Regarding the finite element simulation, it was carried out in the Comsol Multiphysics software, by solving the different resonating frequencies as a function of the increase in the polymer density due to the insets of humidity values.
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Weidt, Sebastian. "Towards microwave based ion trap quantum technology." Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/48893/.
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Scalability is a challenging yet key aspect required for large scale quantum computing and simulation using ions trapped in radio-frequency (rf) Paul traps. In this thesis 171Yb+ ions are used to demonstrate a magnetic field insensitive qubit which has a measured coherence time of 1.5 s, making it an ideal candidate to use for storing quantum information. A magnetic field sensitive qubit is also characterised which can be used for the implementation of multi-qubit gates using a potentially very scalable scheme based on microwaves in conjunction with a static magnetic field gradient instead of using lasers. However, the measured coherence time is limited by magnetic field fluctuations and will prohibit high fidelity gate operations from being performed. To address this issue, the preparation of a dressed-state qubit using a microwave based stimulated rapid adiabatic passage (STIRAP) pulse sequence will be presented. This qubit is protected against the noisy environment making it less sensitive to magnetic field fluctuations. The lifetime of this qubit is measured to demonstrate its suitability for storing quantum information. A powerful method for manipulating the dressed-state qubit will be presented and is used to measure a coherence time of the qubit of 500 ms which is two orders of magnitude longer compared to the magnetic field sensitive qubit. It will also be shown that our method allows for the implementation of arbitrary rotations of the dressed-state qubit on the Bloch sphere using only a single rf field. This substantially simplifies the experimental setup for single and multi-qubit gates. Furthermore, this thesis will present a experimental setup capable of successfully operating microfabricated surface ion traps. This setup is then used to operate and characterise the first two-dimensional (2D) lattice of ion traps on a microchip. A unique feature of the microfabrication technique used for this device is the extremely large voltage that can be applied which allows long ion lifetimes along with large secular frequencies to be measured, demonstrating the robustness of this device. Rudimentary shuttling between neighbouring lattice sites will be shown which could be used as part of a efficient scheme to load a large lattice of ions. One of the many applications of a 2D lattice of ions lies in the field of quantum simulations where many-body systems such as quantum magnetism, high temperature superconductivity, the fractional quantum hall effect and synthetic gauge fields can be simulated. It will be shown how making only minor modifications to the microchip the ion-ion separation can be reduced sufficiently to offer an exciting platform for the successful implementation of 2D quantum simulations. A theoretical investigation on the optimal 2D ion trap lattice geometry will also be presented with the aim to maximise the ratio of ion-ion coupling strength to decoherence from motional heating of the ions and to laser induced off-resonant coupling.
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Armstrong, Mark Albert. "Technology for SiGe heterostructure-based CMOS devices." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9339.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (p. 133-140).
by Mark Albert Armstrong.
Ph.D.
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Kenney, Joshua D., Myron L. Moodie, Gary L. Ragsdale, and Thomas B. Grace. "Technology Trades in IP-Based Telemetry Networks." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606196.
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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, CaliforniaThe integrated Network Enhanced Telemetry (iNET) project established a test article standards working group to define open standards for network components and interfaces for test articles in the aeronautical test environment. Its aim is to utilize the growth of Internet technologies for telemetry networks and ensure interoperability among network devices. This paper describes the technology background and the current technology trades of an IP-based network paradigm used in producing standards for test article networks. Specifically, the paper will include descriptions of selected network technologies as applied to test data and time distribution within test articles.
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Lefevre, David John. "Feedback in technology based instruction : learner preferences." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/18002.
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This research investigates learners’ requirements for the format of feedback when using technology based instruction (TBI). A novel approach is taken by focusing on learners’ preferences for such feedback. The primary method of data collection is to provide subjects with a range of options for TBI feedback and observe those options they choose to view. Feedback has a powerful effect on learning. It is considered one of the ten most significant influences on learner achievement (Hattie and Timperley 2007: 83). Prior research into TBI feedback has focused on the relationship between the format of such feedback and scores achieved in subsequent performance tests. Results have been inconclusive and the format of TBI feedback that should be provided to learners is unclear. This has led to calls for an increased focus on the learners’ perspective of TBI feedback (Mory 2003: 770; Handley, Price, et al. 2011: 548). This research furthers understanding of the learners’ perspective by identifying the format of TBI feedback learners choose to view and factors that affect this choice, hitherto an area not subject to empirical research. The specific focus is learners’ preferences for TBI feedback provided following responses to multiple choice questions. A mixed-method approach is taken comprising technology based observations and semi-structured interviews. In the former, a software tool developed as part of this research delivers items of TBI to students and records their preferences for feedback. Between 2008 and 2010 data were collected on 24 cohorts of students studying one or more of three items of TBI. In total, students responded to 61,929 questions. Results are interpreted through the constructivist perspective and the results are organised into eight themes which are then synthesised with reference to theoretical frameworks to produce a model of learner interaction with TBI feedback. In addition to furthering our understanding of how learners engage with TBI feedback, the results have implications for existing theoretical models and for research aiming to establish the effectiveness of different formats of TBI feedback. For the latter, this research also reveals avenues of future research that potentially address the inconsistent pattern of results found in prior research. No claims are made as to the effectiveness of different feedback formats however a number of recommendations to educators regarding the content, timing and delivery of TBI feedback are suggested.
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Martin, Terri L. "Computer-based technology utilization by elementary teachers /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9842580.
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Ciric, Jovanka. "Boolean matching and level-based technology mapping /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6048.
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Cong, Yu. "Molecular recognition studies based on imprinting technology." Lund : University of Lund, 1998. http://books.google.com/books?id=4J1qAAAAMAAJ.
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Lei, Hongchi. "GaAs-based distributed feedback lasers based on GaAs-InGaP regrowth technology." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18162/.
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This thesis describes the conceptualisation and realisation of GaAs-based self-aligned stripe (SAS) distributed feedback lasers (DFB) based on GaAs-InGaP regrowth technology, and its incorporation into the development of master oscillator power amplifier (MOPA) photonic integrated circuit (PIC). GaAs-based SAS DFB lasers operate via a single longitudinal mode and provide a robust, portable and low cost solution to enable a broad range of potential applications. Compared to other waveguides, e.g. ridge waveguide, SAS structures enable narrower active regions and demonstrate better characteristics with a lower sensitivity to temperature. In my designs, InGaP/GaAs buried gratings are formed utilising an Al-free grating sequence GaAs-InGaP-GaAs, whilst the SAS waveguides are realised via a stripe-etched n-doped InGaP optoelectronic confinement layer, where no AlGaAs is exposed during the fabrication process. Chapter 1 goes through the development of DFB lasers over almost 5 decades since its birth in 1970s, followed by discussion of the gap between present GaAs-based PIC technologies and their commercialisation. After, Chapter 2 introduces the experimental methodology involved in the research activities conducted: fundamental principles of DFB lasers and the 4-stage research process. The following 3 chapters describe the 3 main projects in this research. Chapter 3 begins with the design of 2×, 4× and 6× InGaAs QWs narrow ridge DFB lasers in, and then moved onto the conceptualisation and realisation of 2× and 4× InGaAs QWs SAS DFB lasers in Chapter 4. This SAS-DFB technology was then applied to the development of monolithically integrated 4× InGaAs QWs MOPA PIC in Chapter 5. In Chapter 6, I outline some future work to be conducted for further achievement. An optimised design of SAS-DFB-MOPA is first discussed. I then present some preparatory works for two other potential future directions: widely tunable GaAs-based sampled grating distributed Bragg reflector laser (SG-DBR) and high power ~1180nm In(Ga)As/GaAs DWELL (dot-in-a-well) SAS-DFB-MOPA.
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Lissitsyn, Denis. "A knowledge-based technology advising system for web-based application development." Ohio University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1173983075.
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Sparkes, Douglas I. "Assessment of technology-based ventures, complexity and viability : toward early-stage, technology-based venture screening and assessment decision aids." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60568.pdf.
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Su, Yu-Hao. "Power Enhancement of Piezoelectric Technology based Power Devices by Using Heat Transfer Technology." Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0025/document.
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L’objectif de cette étude est d’améliorer les performances des transformateurs piézoélectriques en terme de courant de sortie et de puissance pour des applications d’alimentation DC/DC, grâce à la gestion de l’échauffement. Le courant de sortie des transformateurs piézoélectriques, et donc la puissance transmise, sont directement liés à la vitesse de vibration qui pour des valeurs élevées engendre des pertes et une forte élévation de température. Cette élévation excessive de la température a comme conséquence le changement des caractéristiques du transformateur et plus particulièrement la diminution du facteur de qualité Q. Ainsi cela entraine une limite structurelle de la puissance transmise du transformateur. Une solution pour augmenter le courant de sortie est l’utilisation d’un redresseur doubleur de courant, qui grâce à 2 inductances permet, à courant de charge donné, de diminuer la vitesse de vibration du transformateur, mais ne permet pas de régler le problème d’échauffement du transformateur. Dans cette thèse nous proposons des moyens d’évacuation de la chaleur ainsi que le choix de l’environnement dans lequel le transformateur devra fonctionner. L’influence de différents systèmes de refroidissement d’un convertisseur DC/DC à base transformateur piézoélectrique est étudiée. L’étude thermique du transformateur piézoélectrique multicouche polarisé en épaisseur et ayant des électrodes circulaires met en évidence un comportement non linéaire. Une plaque vibrante piézoélectrique est d’abord envisagée pour créer un flux d’air qui augmente l’évacuation de chaleur par convection, puis un module de refroidissement utilisant l’effet thermoélectrique. Les mesures montrent que la première solution est plus avantageuse car elle améliore sensiblement les performances du transformateur pour un coût énergétique très faible. Une étude thermique par éléments finis complète cette étude, montrant que l’approche par schéma électrique est pertinente. La puissance que peut délivrer le transformateur sur une charge optimale est encore augmentée. Enfin, ce travail montre qu’en combinant les dispositifs de refroidissement tout en respectant la condition de température inférieure à 55°C, le rendement du convertisseur reste raisonnable (70%) et la puissance disponible peut doubler dans le meilleur des casThe objective of this study was to increase the output current and power in a piezoelectric transformer (PT) based DC/DC converter by adding a cooling system. It is known that the output current of PT is limited by temperature build-up because of losses especially when driving at high vibration velocity. Excessive temperature rise will decrease the quality factor Q of piezoelectric component during the operational process. Simultaneously the vibration energy cannot be increased even if under higher excitation voltage. Although connecting different inductive circuits at the PT secondary terminal can increase the output current, the root cause of temperature build-up problem is not solved.This dissertation presents the heat transfer technology to deal with the temperature build-up problem. With the heat transfer technology, the threshold vibration velocity of PT can be increased and thus the output current and output power (almost three times).Furthermore, a comparison between heat transfer technology and current-doubler rectifier applied to the piezoelectric transformer based DC/DC converter was also studied. The advantages and disadvantages of the proposed technique were investigated. A theoretical-phenomenological model was developed to explain the relationship between the losses and the temperature rise. It will be shown that the vibration velocity as well as the heat generation increases the losses. In our design, the maximum output current capacity can increase 100% when the operating condition of PT temperature is kept below 55°C. The study comprises of a theoretical part and experimental proof-of-concept demonstration of the proposed design method
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Gappisch, Steffen. "TCAD-based development of a flash-EPROM technology /." [S.l.] : [s.n.], 1996. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11581.
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Tobar, Muñoz Hendrys Fabián. "Supporting technology for augmented reality game-based learning." Doctoral thesis, Universitat de Girona, 2017. http://hdl.handle.net/10803/450519.
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In this thesis, Augmented Reality Game-Based Learning (ARGBL) is explored and arguments are given in favor of its application in the classrooms. The thesis explores the concept and proposes technologies, theories and recommendations to help teachers and designers to include it in their learning activities.
Here, the thesis shows a state of art on AR and GBL showing the previous works that support its application. This state of art also shows the strategies that have been used to design and create AR and GBL experiences
An exploratory scenario is shown where an ARGBL game was used for a reading comprehension activity in a classroom; an AR book involving a game was used.
The thesis proposes a method named “Co-CreARGBL” that is meant to guide teachers and professional designers in the creation, deployment and evaluation of ARGBL experiences. Finally. the thesis argues for the validity of the methodEn esta tesis el Aprendizaje Basado en Juegos con Realidad Aumentada (ARGBL) se explora y se presentan argumentos en favor de su aplicación. La tesis explora el concepto y propone tecnologías, teorías y recomendaciones que ayudan a profesores y diseñadores a incluir el ARGBL en sus actividades de aprendizaje. Contiene un estado del arte en AR y GBL mostrando conceptos y trabajos relacionados. Este estado del arte también muestra estrategias que han sido usadas para diseñar y crear experiencias de AR y GBL. Se describe un escenario exploratorio donde un juego ARGBL fue usado en una actividad de comprensión de lectura en un salón de clase; un libro con AR que incluía un juego fue desarrollado y usado. La tesis propone un método para guiar a profesores y diseñadores en la creación, despliegue y evaluación de experiencias ARGBL. Finalmente, la tesis argumenta en favor de la validez del método
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Saboe, Michael S. "A software technology transition entropy based engineering model." Monterey, Calif. : Naval Postgraduate School, 2002. http://edocs.nps.edu/npspubs/scholarly/dissert/2002/Mar/02Mar%5FSaboe%5FPhD.pdf.
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Dissertation (Ph.D. in Software Engineering)--Naval Postgraduate School, March 2002.Dissertation supervisor: Luqi. "March 2002." Description based on title screen as viewed on July 15, 2010. Author(s) subject terms: Software Engineering, Technology Transfer, Information Theory, Communication Theory, Statistical Mechanics, Dynamical Systems, Control Theory, Learning Curves, Entropy, Information Temperature, Temperature of Software (o Saboe), Technology Transfer Dynamics, Research Management, Diffusion of Innovation, Project Management, Physics of Software Includes bibliographical references (p. 457-489). Also available in print.
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Norrman, Charlotte. "Entrepreneurship Policy : Public Support for Technology-Based Ventures." Doctoral thesis, Linköpings universitet, Projekt, innovationer och entreprenörskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11739.
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The subject of this thesis is entrepreneurship policy and the focus is on public support programmes directed to early stages technology-based ventures. It advocates that a broad view should be taken with regard to the type of policies for entrepreneurship that aim at supporting the facilitation of the supported ventures’ ability to link to their surrounding innovation system, in which they can secure their access to crucial external resources. Taking the departure in the perspective that early stages technology-based ventures are vulnerable, this thesis shows that publicly financed entrepreneurship supporting programmes can be motivated because small and newly started ventures have got limited resources, and because the risks, with which they are associated, generally make them unattractive in the eyes of private actors. Among the practical implications of this thesis, the following findings are emphasised: Public support, directed to the very earliest stages of venture development benefits from broadness, for the latter stages, specialisation and a higher degree of selectiveness could be an advantage. Moreover, it is important that the support provided take into account the whole process of business development, i.e. both the issues concerned with product/service and the issues connected to the market. A long-term commitment, cooperation between different actors and information about what support is available, are other aspects that are important for policymakers to consider in their design of public policies to support entrepreneurship. Finally, the importance of evaluative awareness must be emphasised from the very start.Den här avhandlingen är en sammanläggning av 7 studier kring vilka en kappa med titeln ”Entreprenörskapspolicy: offentligt stöd för teknikbaserade företag” har skrivits. De inkluderade studierna beskrivs kortfattat i slutet av den här sammanfattningen. Syftet med avhandlingen är att analysera skälen till varför statliga interventioner kan vara berättigade, vidare att analysera målsättningar, design och resultat av offentliga program för stöd av nya teknikbaserade företag/projekt och slutligen att identifiera såväl praktiska som forskningsintressanta implikationer för utformningen av framtida stödaktiviteter. Avhandlingen baseras till största delen på olika typer av kvantitativa analyser av Stiftelsen Innovationscentrum (SIC) (studie 2-6). Förutom detta ingår en konceptuell studie där ett ramverk för att utvärdera inkubatorer, främst ur ett ”best practice” perspektiv, har tagits fram (studie 1). Slutligen har jag inkluderat en pågående uppföljningsstudie av Vinnovas program Vinn Nu (studie 7). Avhandlingen förespråkar en bred syn på begreppet entreprenörskapspolicy, där syftet med stödet är att underlätta för företag/projekt att koppla upp sig mot relevanta innovationssystem där de kan säkra sin tillgång på externa resurser. Med utgångspunkt i ett sårbarhetsperspektiv visar avhandlingen att offentligt finansierade program som stödjer entreprenörskap kan motiveras genom att de små och nystartade företagens resurser är begränsade och eftersom riskerna ofta gör att intresset från privata aktörer att gå in i dessa företag är lågt. Avhandlingens praktiska implikationer är bland annat att det stöd som riktas till de allra tidigaste utvecklingsfaserna i syfte att kvalificera idéer bör vara brett. Däremot kan ett mer selektivt urval vara fördelaktigt i något senare utvecklingsskeden och för mer specialiserade stöd. Vidare visar de inkluderade studierna på behovet av att se till hela företagets utvecklingsprocess. Det innebär bland annat att det är nödvändigt att kombinera hårt och mjukt stöd och att lika vikt läggs vid produkt- och marknadsutveckling. Offentligt stöd bör också vara långsiktigt, och samarbete mellan olika stödprogram är viktigt, inte minst med avseende på information om vilka stöd som finns och hur, var, när och av vem dessa kan sökas. Slutligen understryks vikten av att stödprogram redan från början bör ta hänsyn till utvärderingsaspekter.
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Van, den Heever Thomas Stanley. "Perceived value creation in technology-based entrepreneurial businesses." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/d1021047.
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Small entrepreneurial businesses are widely regarded as important contributors to the economic well-being of countries all over the world as they create value for both the entrepreneur and the economy in which they operate. The value creation process in these businesses often differs from what commonly happens in larger established businesses. Resources available to the entrepreneur are normally much more restricted and decisions are often based on limited information. This thesis focuses on the value that is created by technology-based entrepreneurial businesses, the leveraging of limited resources and the decision-making orientation they adopt during this process. Given the importance of technology-based entrepreneurial businesses in contributing to economic growth and job creation in most global economies, as well as the limited previous research conducted amongst these businesses, the purpose of this study was to identify the human and social capital factors influencing value creation in technology-based entrepreneurial businesses. With this purpose in mind, the primary objective was to identify, investigate and empirically test the relationships between the various identified factors and Perceived value creation in technology-based entrepreneurial businesses, taking into account their decision-making orientation, as well as the uncertain environment under which they operate. This study uses the Resource-Based View of the business as the basis of its theoretical orientation. The literature review revealed five main categories of constructs, namely Knowledge and skills, Experience, Networks, Decision-making orientation and Perceived environmental uncertainty influencing the dependent variable Perceived value creation in technology-based entrepreneurial businesses. Knowledge and skills, Experience and Networks were identified as independent variables while Decision-making orientation was identified as the mediating variable and Perceived environmental uncertainty as the moderating variable. Six demographic variables (type of industry, age of business, number of employees, age of entrepreneur, academic qualifications of entrepreneur and the number of previous businesses started by the entrepreneur) were also identified as potential influencing factors. Various hypotheses were formulated to be tested during the empirical investigation. Each construct was clearly defined and then operationalised. Operationalisation was done by using reliable and valid items sourced from tested measuring instruments used in previous studies, as well as a number of self-generated items based on secondary sources. A structured questionnaire was made available to respondents identified by means of the convenience snowball sampling technique, and the data collected from 313 usable questionnaires was subjected to various statistical analyses. An Exploratory Factor Analyses (EFA) was conducted which confirmed the different variables, and Cronbach-alpha coefficients were calculated to confirm the reliability of the measuring instrument. Structural Equation Modelling (SEM) was the main statistical procedure used to test the significance of the relationships hypothesised between the various independent, mediating, moderating and dependent variables. A number of different models were tested, and the results discussed and explained. The main finding of the study was that technology-based entrepreneurial business can create financial and non-financial value by adopting a decision-making orientation in the business of co-creating the future with other stakeholders. The most important human and social capital factors that influence the decision-making orientation of these businesses are Knowledge and skills, Unstructured networks and Structured networks. The main limitations of the study were firstly the convenience snowball sampling technique used to collect responses, secondly the dependence of reporting on organisation issues by individuals, and thirdly the limited number of influencing factors included in the models. Future research should address these limitations, and could include qualitative analyses. This study has added to the empirical body of knowledge on entrepreneurship research by investigating a particularly important segment of the literature, namely technology-based entrepreneurial businesses. By identifying and developing various models that outline the most significant factors that influence perceived value creation in technology-based entrepreneurial businesses, this study offers recommendations and suggestions for managing these businesses in such a way as to improve the creation of financial and non-financial value in them. It further provides recommendations for business teaching programmes to enhance curriculums by focusing on alternatives to the format of formal business planning.
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Aydinci, Nedim. "Processing Technology for Si Based Tandem Solar Cells." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177442.
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This project focuses on the investigation of Silicon based Tandem solar cell fabricated by using the Hydride Vapor Phase Epitaxy (HVPE). In the state-of-the-art multi-junction solar cell manufacturing epitaxial technologies are used for sub-cell formation, such as MOVPE (Metal Organic Vapour Phase Epitaxy) [1] or MBE (Molecular Beam Epitaxy) [2]. Tandem solar cell structures consist of subcells made of III-V semiconductors serially connected or grown on a suitable semiconductor substrate [3]. The used semiconductor materials have to be lattice matched to each other and with optimum band gap combinations [4]. Multi-junction solar cells with Si and III-V semiconductor sub-cells are promising to achieve extremely high efficiency. The objective of this project is to investigate a cost effective fabrication technology to realize III-V semiconductor and silicon based sub-cells in tandem solar cells. The Si p-n junction formation by PH3 diffusion for the silicon sub cell is studied in HVPE. A prototype InP solar cell was fabricated by HVPE and its I-V performance was studied. In this thesis, the impact of HVPE process parameters on the silicon p-n junction formation was examined by alternating the process temperature. Silicon samples were processed in the HVPE with temperature values of 1st (605 0C) < 2nd (657 0C) < 3rd (720 0C). It is observed that the temperature affects the quality of the formed Si p-n junction. The Si samples treated at 720 0C show a diode performance with a deviated I-V curve due to parasitic resistances. The InP solar cell fabrication consisted of the epitaxial growth of sulfur doped n-InP and zinc doped p-InP materials on top of each other to form n+/n+/n-/p+ [5] structure. Ohmic conduction through the InP solar cell structure was observed after the contacts formation, which could be due to the metal alloy spiking through the p-InP emitter layer during annealing. Process mitigations to fabricate InP solar cell by HVPE are proposed at the end of project.
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Uden, Lorna. "A courseware engineering methodology for technology-based learning." Thesis, Staffordshire University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310576.
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Wisdom, Michael. "Optimised Wavelet-Based Image Compression for EPGA Technology." Thesis, University of Kent, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499646.
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Smith, Lyndon Neal. "A knowledge based system for powder metallurgy technology." Thesis, University of the West of England, Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364080.
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Kourakis, Alexandros. "Ontology-based knowledge management for technology intensive industries." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/611/.
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SIMOES, ALESSANDRA MATHIAS. "DEVELOPMENT OF SMALL TECHNOLOGY-BASED COMPANIES: CASE PIPEWAY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7073@1.
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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIORA presente dissertação tem como objetivo pesquisar as características de empresas de base tecnológica, particularmente no que tange o seu processo de amadurecimento. Pretende-se aproximar a teoria da prática, realizando, para isso, um estudo de caso em uma empresa oriunda de uma incubadora tecnológica - a PipeWay Engenharia. Inspirado na metáfora apontada pelo uso do termo incubadora, esse estudo toma como base uma analogia entre as fases do desenvolvimento de uma empresa e as etapas de amadurecimento do ser humano. O estudo focou a adolescência organizacional, relatando os principais desafios a serem vencidos e dando exemplos de como empresas de base tecnológica poderiam superar esses problemas com menores dificuldades.
This dissertation aims at research the characteristics of technology-based companies, particularly in reference to their process of development. The intention is to bring theory and practice closer. Therefore, it is carried out a case study in a company that comes from a technology incubator - named PipeWay Engenharia. Inspired by such metaphor, this study takes the analogy between human and company development as premise. The focus of the study was on the organizational adolescence, showing the main challenges faced by a technology-based company and suggesting how it could be coped with.
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Haji, Awang Radzuan Mohammad Sofian. "Evolving Brunei Darussalam's economy towards technology-based industries." Thesis, University of Sussex, 2016. http://sro.sussex.ac.uk/id/eprint/65634/.
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Technology-Based Industries continue to be at the forefront of a nation's sustainable economic development. These account for the largest share of employment, business activity and labour income in most primary sectors. Technology-Based Industries contribute to multi-lateral development of a nation's economy through innovation, new technologies and use of new knowledge. The government of Brunei Darussalam sought in the past decade to diversify the economy with limited success. Oil and gas and government spending still account for most of Brunei's economic activity. The small size of the domestic market discourages foreign direct investment in Brunei Darussalam. Brunei's government encourages foreign investment especially when it involves emerging new technologies and technology transfers. The research question is: how to transfer new technologies into Brunei Darussalam industry and to quantify the impact of these Technology-Based Industries; can a resource based-economy offer a solution to tackle the difficulties in industrial advancement that Brunei Darussalam is currently struggling with. This research aims to study factors for the successful transfer of technology-based industries and identify the key issues in technology transfers that significantly affect the rate of technological integration and evaluate the concept of technology transfers and its contribution to the sustainable economic development of a small state economy. It adopts multiple techniques both inductive and deductive approaches through SWOT-analysis and case studies to explore and later analyze the importance of the visionary drive underlying the technology-based industrial strategy that contributes to policy improvement, via awareness of alternatives and discovery of latent policy constraints and opportunities from investigation of others' experience. The bottom line of this research is to provide the basis for government policies on how the technology transfer can be achieved in the Brunei Darussalam industrial context.
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Murray, Robert T. "Nonlinear wavelength conversion with optical fibre based technology." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/25624.
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It is no exaggeration to state that the low-loss optical fibre has revolutionised the way in which we as a society lead our lives. The transfer and management of vast tracts of data generated minute by minute world over is only possible due to the development of the optical fibre and corresponding optical amplifiers, necessary for the implementation of telecommunications networks over large distances. Outside of the telecommunications sphere, the optical fibre has also made a huge impact on the laser market in the past three decades, due to the inherently robust nature and alignment-free operation of fibre based devices. Fibre lasers have now penetrated into the manufacturing market, and are finding increasing applications in numerous areas from medicine to defence. Typical fibre laser sources are constrained to operate in the emission bands of common rare-earth dopants, such as, ytterbium, erbium, or thulium. However, it is possible to extend the spectral coverage of standard fibre lasers through nonlinear conversion techniques. The temporal properties of pulsed laser sources, can be similarly manipulated, through the combined management of nonlinearity and dispersion. The work presented in this thesis is based upon these two themes of spectral and temporal diversity. Firstly, I will examine fibre-based parametric wavelength conversion, demonstrating fibre laser sources in the visible and near-visible spectral regions, suitable for bio-photonics imaging applications. Secondly, I will look at fibre-based nonlinear chirped pulse amplification, in particular, the design and implementation of a femtosecond μJ level source for future experiments in nonlinear optics. Both areas of research are tied together by the common thread of utilising new and emerging optical fibre based technology for nonlinear wavelength conversion.
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Savoie, Robert. "A Model for Regional Technology-Based Economic Development." ScholarWorks@UNO, 2009. http://scholarworks.uno.edu/td/907.
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Technology-based economic development has been a highly sought-after objective for regions in developed and developing countries alike. The wealth created by regional knowledgebased economies like Silicon Valley is an attractive outcome. Without understanding clusterbased economic strategy, the different types of technology-based economic development approaches, the factors that dictate success or failure, and how those factors interrelate within a particular region, then the probability of success is minimal at best. Economic Development is a process and hence lends itself to a Systems Engineering approach, which was chosen as the methodology for analyzing and designing a better model for studying regions around the world to identify Factors that were both common and key to successful regional development. Each region was viewed as a system with inputs and outputs. The challenge in developing a useful system model is the development of the required Factors and Processes to be used. In the development of the model most of the Factors are internal to the system, but many may be affected by external events. The weighting (importance) of these Factors is the topic of much debate. To develop a baseline of Factors the Delphi method was used. Fortunately, a number of world-wide experts agreed to participate in one on one interviews to analyze these Factors, which in itself added a great deal to the body of knowledge of economic development beyond just the Factors. One obvious result was the essentially unanimous opinion of the group that leadership was the most important factor. A less obvious outcome, but one of equal importance was that there are two classes of regional economic development: one for mass job creation and another for the creation of a knowledge-based regional economy. Often regions undertake economic development without understanding this significant difference. While the model developed can be used for either goal it is extremely important that developers know in advance which goal is being pursued, which is also one of the critical outcomes of strong leadership. While all indications are that this model is a major improvement over current approaches, because this is a new approach until this research is followed by additional interviews, and by applying the model to actual regional technology-based economic development environments it's validity remains unproven.
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Yan, Yan. "Silicon-based tunnel diode technology." 2008. http://etd.nd.edu/ETD-db/theses/available/etd-07162008-003812/.
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Thesis (Ph. D.)--University of Notre Dame, 2008.Thesis directed by Alan C. Seabaugh for the Department of Electrical Engineering. "July 2008." Includes bibliographical references (leaves 126-130).
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Chi, Po-Len Borland, and 紀柏任. "A Design Pattern Based Integration Technology." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/68548031655907091432.
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洪肇廷. "Smoke Detection Based on Video Technology." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85135253961938731119.
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博士國立交通大學
電控工程研究所
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Smoke is an early sign of most fires; therefore, selecting an appropriate smoke-detection method is essential. Video-based fire detection is currently a fairly common application with the growth in the number of installed surveillance video systems. However, fast detecting smoke without creating a false alarm remains a challenging problem for open or large spaces with the disturbances of common moving objects, such as pedestrians and vehicles. Hence, two important targets for improving video-based smoke detector are the short reaction time and the low false alarm rate. This thesis aims to fast detect smoke while eliminate false alarm cases by analyzing features which is linearly separable. This thesis proposed three linear separable features and also introduces a framework for design a simple Video Technology-based system with temporal and spatial analysis. In this study, the process of extracting smoke features from candidate regions was accomplished by analyzing the spatial and temporal characteristics of video sequences for three important features: edge blurring, gradual energy changes, and gradual chromatic configuration changes. The proposed spatial-temporal analysis technique improves the feature extraction of gradual energy changes. Moreover, this thesis proposed a global verification stage based on the statistic of calculated local features to further lower the false alarm rate. The effectiveness of the proposed algorithm was evaluated on a PC with an Intel® Core™2 Duo CPU (2.2 GHz) and 2 GB RAM. The average processing time was 32.27 ms per frame, i.e., the proposed algorithm can process 30.98 frames per second. Experimental results showed that the proposed system can detect smoke effectively with a low false-alarm rate and a short reaction time in many real-world scenarios.
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陳智祿. "A Radio-based Image Transmission Technology." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68793371842718186399.
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