Dissertations / Theses on the topic 'Electronics'
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Siebert, Wolfgang Peter. "Alternative electronic packaging concepts for high frequency electronics." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-223.
Full textXu, Shu [Verfasser]. "Graphene Electronics : Device Fabrication and Electronic Transport / Shu Xu." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1020496436/34.
Full textQian, Xiaofeng. "Electronic structure and transport in molecular and nanoscale electronics." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44783.
Full textIncludes bibliographical references (p. 239-256).
Two approaches based on first-principles method are developed to qualitatively and quantitatively study electronic structure and phase-coherent transport in molecular and nanoscale electronics, where both quantum mechanical nature of electrons and dimensionality of systems play the critical roles in their electronic, magnetic and optical properties. Our first approach is based on Green's function method with ab initio quasiatomic orbitals within Landauer formalism. To efficiently and accurately apply Green's function method, we develop a minimal basis-set of quasiatomic orbitals from plane-wave density functional theory (DFT) results. This minimal basis-set resembles quasi-angular momentum characteristics in solid state systems and it further validates Slater's original idea of linear combinations of atomic orbitals. Based on their ab initio tight-binding matrices, the accuracy, efficiency and stability of our scheme are demonstrated by various examples, including band structure, Fermi surface, Mülliken charge, bond order, and quasiatomic-orbitals-projected band structure and quasiatomic-orbitals-projected Fermi surface. Remarkably these quasiatomic orbitals reveal the symmetry and chemical bonding nature of different molecular, surface and solid systems. With this minimal basis-set, quantum conductance and density of states of coherent electron transport are calculated by Green's function method in the Landauer formalism. Several molecular and nanoscale systems are investigated including atomic wires, benzene dithiolate, phenalenyl dithiolate and carbon nanotube with and without different types of defects.
(cont.) Conductance eigenchannel decomposition, phase-encoded conductance eigenchannel visualization, and local current mapping are applied to achieve deeper understandings of electron transport mechanism, including spin dependence, dimensionality dependence, defect dependence, and quantum loop current induced by time-reversal symmetry breaking. Our second approach naturally arises due to the fact that electron transport is an excited state process. Time-dependent density functional theory (TDDFT) is a fundamental approach to account for dynamical correlations of wave functions and correct band gap in DFT. In our second approach, we mainly focus on the mathematical formulation and algorithm development of TDDFT with ultrasoft pseudopotentials and projector augmented wave method. Calculated optical absorption spectrum gives correct positions and shapes of excitation peaks compared to experimental results and other TDDFT results with norm-conserving pseudopotentials. Our method is further applied to study Fermi electron transmission through benzene dithiolate molecular junction sandwiched by two gold chains. It is first verified that group velocity of Fermi electron in the gold chain obtained by TDDFT agrees with that from band structure theory. Then under rigid band and zero bias approximations, a tiny Fermi electron wave packet from the chain is injected into the molecular junction. Transmission coefficient evaluated after the scattering process is around 5%. This is in agreement with the result from Green's function method. The two methods also show similar characteristic propagation channel. This nice agreement verifies that Green's function approach based on DFT reaches the TDDFT result without dynamical electron correlations in the linear response region.
(cont.) With further development, our quasiatomic orbitals can serve as a minimal basis-set to combine non-equilibrium Green's function and TDDFT together with GW quasi-particle corrections. The unified method will provide a more accurate and efficient way to explore various molecular and nanoscale electronic devices such as chemical sensor, electromechanical device, magnetic memory, and optical electronics.
by Xiaofeng Qian.
Ph.D.
Rajagopal, Senthil Arun. "SINGLE MOLECULE ELECTRONICS AND NANOFABRICATION OF MOLECULAR ELECTRONIC DEVICES." Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1155330219.
Full textLi, Elise Yu-Tzu. "Electronic structure and quantum conductance of molecular and nano electronics." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65270.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 129-137).
This thesis is dedicated to the application of a large-scale first-principles approach to study the electronic structure and quantum conductance of realistic nanomaterials. Three systems are studied using Landauer formalism, Green's function technique and maximally localized Wannier functions. The main focus of this thesis lies on clarifying the effect of chemical modifications on electron transport at the nanoscale, as well as on predicting and designing new type of molecular and nanoelectronic devices. In the first study, we suggest and investigate a quantum interference effect in the porphyrin family molecules. We show that the transmission through a porphyrin molecule at or near the Fermi level varies by orders of magnitude following hydrogen tautomerization. The switching behavior identified in porphyrins implies new application directions in single molecular devices and molecular-size memory elements. Moving on from single molecules to a larger scale, we study the effect of chemical functionalizations to the transport properties of carbon nanotubes. We propose several covalent functionalization schemes for carbon nanotubes which display switchable on/off conductance in metallic tubes. The switching action is achieved by reversible control of bond-cleavage chemistry in [1+2] cycloadditions, via the 8p 3 8s p 2 rehybridization it induces; this leads to remarkable changes of conductance even at very low degrees of functionalization. Several strategies for real-time control on the conductance of carbon nanotubes are then proposed. Such designer functional groups would allow for the first time direct control of the electrical properties of metallic carbon nanotubes, with extensive applications in nanoscale devices. In the last part of the thesis we address the issue of low electrical conductivity observed in carbon nanotube networks. We characterize intertube tunneling between carbon nanotube junctions with or without a covalent linker, and explore the possibility of improving intertube coupling and enhance electrical tunneling by transition metal adsorptions on CNT surfaces. The strong hybridization between transition metal d orbitals with the CNT [pi] orbitals serves as an excellent electrical bridge for a broken carbon nanotube junction. The binding and coupling between a transition metal atom and sandwiching nanotubes can be even stronger in case of nitrogendoped carbon nanotubes. Our studies suggest a more effective strategy than the current cross-linking methods used in carbon nanotube networks.
by Elise Yu-Tzu Li.
Ph.D.
ZAMPETTI, EMILIANO. "Future evolution of the electronics nose: technology and electronic design." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2008. http://hdl.handle.net/2108/495.
Full textThe principal aim of this PhD thesis is a deep study of an artificial olfaction system (Electronic Nose – EN) mainly dedicated to space applications. The rather particular environment destined to host this apparatus has required a particular attention on many of the design details in order to infer about all those electrical and mechanical features which are necessary to overcome the very stringent stress parameters imposed by the space flight international organization. The request of a particular effort oriented to the overall optimization has produced a general quality factor which, we believe, will influence also all the terrestrial applications where performances may be of a lower level. The adopted strategy which was hold along the past three years has regarded the following points: a) miniaturization of the previous EN (Libra Nose) without reducing the digital flexibility and including all the interface circuits in a single FPGA; b) improvement of the analog part, in particular a new design of the oscillators, and of the analog interface toward the digital part. To this purpose a particular care at the design level has been paid towards: the reduction of occupied spaces, and consumption by using working supply voltages from 5 V. to 3V. and even 1,8 V.: reduction of about all the interferences among sensors; c) introduction of two new techniques improving the performances of the couple QCM sensor and oscillator; one of them is based on the utilization of a single oscillator for all the QCM sensors, reducing the occupied space for the circuits from N to 1, where N is the dimension of the sensor matrix; the other technique concerns the idea of performing the frequency measurement switching on each oscillator one in a time, saving in this way energy and achieving a better signal to noise ratio; d) increasing the overall performances of the sensing part with respect to the capability of increasing the sensitivity towards volatile compounds through the introduction of an integrated heater applied to one of the quartz surfaces. The basic idea considers the fact that the presence of such a heater contributes, once activated, to reduce the desorption time and, as a consequence, to reduce the recovery time in the cleaning phase. In this context by using a control system of the thermal sigma delta (TΔ) type, it has been proven that a better performance on the sensitivity/selectivity tuning with respect to the volatile compound adsorption, can be achieved. Moreover, by means of the utilization of the thermal sigma delta control, for the first time a flow sensor has been embedded on QCM. The main result of this thesis has been the acceptation on behalf of the International Space Agency of a space dedicated EN which was indeed used in the frame of the SOYUZ Mission. The passed space tests together with the results obtained during the Mission have confirmed the outstanding design done in the first part of this thesis. Further improvements have been achieved in the last thesis period allowing the availability of an instrument able to live long time in interplanetary Missions and as an important throughput, to be employed in many of the terrestrial applications regarding the industrial, food and agricultural, medicine, and ambient context.
Zhu, Zhineng. "Low Noise Offset Operational Amplifier for Nanopore-based Gene Sequencer." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/ZhuZ2007.pdf.
Full textLoftin, Guy L. "Relationships among electronics troubleshooting, mathematics, and electronics knowledge." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/40156.
Full textEd. D.
Flanagan, Beavan. "Turning over, for 13 instruments, piano, electronic microtonal piano and electronics." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116997.
Full textTurning Over ('ressasser') est une composition pour 13 instruments, piano, piano électronique et sons électroniques d'une durée de 13 minutes. Un fort accent sur l'harmonie, qui est le résultat de deux années de recherche sur les théories du tempérament musical du 17e, 18e et 20e siècle, est reflété dans les variations subtiles de tempérament entre les instruments acoustiques et les éléments électroniques. Le discours musical reflète des préoccupations philosophiques concernant le concept de l'essence dans la musique et de sa nature illusoire – ceci se traduit dans une forme musicale qui est toujours en état de transformation.
Georgiev, Vihar Petkov. "Electronic structure/function relationships in metal nanowires : components for molecular electronics." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:594d870f-feef-474b-98e9-5f09505908a3.
Full textLiu, Tianxiang(Albert Tianxiang). "Colloidal Electronics." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/130612.
Full textCataloged from the official PDF of thesis. "July 2020."
Includes bibliographical references.
Arming nano-electronics with mobility extends artificial systems into traditionally inaccessible environments. Carbon nanotubes (1D), graphene (2D) and other low-dimensional materials with well-defined lattice structures can be incorporated into polymer microparticles, granting them unique electronic functions. The resulting colloidal electronic 'cells', comprised of microscopic circuits connecting artificial 'organelles' (e.g., generators, sensors, logic gates, etc.), combine the modularity of modern electronics with the characteristic mobility found in dispersive colloidal systems. Fundamental to colloidal electronics lie two challenges: (1) providing electrical energy to a microscopic system with limited footprint; and (2) developing energy efficient electronic devices and circuitries with low power consumption. In this context, my thesis introduces two concepts - Autoperforation and Asymmetric Chemical Doping - as means to fabricate and power electronic circuit elements on top of colloidal particles. These advances allow us to build the first colloidal electronic system that perform autonomous functions integrating energy harvesting, chemical detection and digital memory recording - all within a form-factor no larger than biological cells.
by (Albert) Tianxiang Liu.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Chemical Engineering
Zwolak, Michael Philip. "DNA Electronics." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/78135.
Full textMaster of Science
Jäckel, Frank. "Self assembly and electronic properties of conjugated molecules: towards mono molecular electronics." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975579010.
Full textUnge, Mikael. "Molecular Electronics : A Theoretical Study of Electronic Structure of Bulk and Interfaces." Doctoral thesis, Linköpings universitet, Beräkningsfysik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6938.
Full textHuijben, Mark. "Interface engineering for oxide electronics: tuning electronic properties by atomically controlled growth." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/55832.
Full textUnge, Mikael. "Molecular electronics : a theoretical study of electronic structure of bulk and interfaces /." Linköping : Univ, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6938.
Full textNavaraj, William Ringal Taube. "Inorganic micro/nanostructures-based high-performance flexible electronics for electronic skin application." Thesis, University of Glasgow, 2019. http://theses.gla.ac.uk/40973/.
Full textRajagopal, Subramanian. "Transition of low-volume complex electronic system industries to lead-free electronics." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/116.
Full textThesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Fard, Ali. "Analysis and Design of Low-Phase-Noise Integrated Voltage-Controlled Oscillators for Wide-Band RF Front-Ends." Doctoral thesis, Mälardalen University, Department of Computer Science and Electronics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-88.
Full textThe explosive development of wireless communication services creates a demand for more flexible and cost-effective communication systems that offer higher data rates. The obvious trend towards small-size and ultra low power systems, in combination with the ever increasing number of applications integrated in a single portable device, tightens the design constraints at hardware and software level. The integration of current mobile systems with the third generation systems exemplifies and emphasizes the need of monolithic multi-band transceivers. A long term goal is a software defined radio, where several communication standards and applications are embedded and reconfigured by software. This motivates the need for highly flexible and reconfigurable analog radio frequency (RF) circuits that can be fully integrated in standard low-cost complementary metal-oxide-semiconductor (CMOS) technologies.
In this thesis, the Voltage-Controlled Oscillator (VCO), one of the main challenging RF circuits within a transceiver, is investigated for today’s and future communication systems. The contributions from this work may be divided into two parts. The first part exploits the possibility and design related issues of wide-band reconfigurable integrated VCOs in CMOS technologies. Aspects such as frequency tuning, power dissipation and phase noise performance are studied and design oriented techniques for wide-band circuit solutions are proposed. For demonstration of these investigations several fully functional wide-band multi-GHz VCOs are implemented and characterized in a 0.18µm CMOS technology.
The second part of the thesis concerns theoretical analysis of phase noise in VCOs. Due to the complex process of conversion from component noise to phase noise, computer aided methods or advanced circuit simulators are usually used for evaluation and prediction of phase noise. As a consequence, the fundamental properties of different noise sources and their impact on phase noise in commonly adopted VCO topologies have so far not been completely described. This in turn makes the optimization process of integrated VCOs a very complex task. To aid the design and to provide a deeper understanding of the phase noise mechanism, a new approach based on a linear time-variant model is proposed in this work. The theory allows for derivation of analytic expressions for phase noise, thereby, providing excellent insight on how to minimize and optimize phase noise in oscillators as a function of circuit related parameters. Moreover, it enables a fair performance comparison of different oscillator topologies in order to ascertain which structure is most suitable depending on the application of interest. The proposed method is verified with very good agreement against both advanced circuit simulations and measurements in CMOS and bipolar technologies. As a final contribution, using the knowledge gained from the theoretical analysis, a fully integrated 0.35µm CMOS VCO with superior phase noise performance and power dissipation is demonstrated.
Lestoquoy, Guillaume. "Multimaterial fiber electronics." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87929.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 119-129).
As the number of materials that are thermally-drawable into fibers is rapidly expending, numerous new multimaterial fiber architectures can be envisioned and fabricated. High-melting temperature metals, compound materials, composite, conductive or ferroelectric polymers: the broad diversity of these materials' nature and properties, combined with various post-fabrication treatments recently developed (poling, annealing, injection, coating, capillary breakup), enable the making of novel in-fiber, stand-alone-fiber and fiber-array devices. In this thesis, we demonstrate a wide variety of novel multimaterial fiber capabilities at all these levels, focusing specifically on new electronic functions. First, the implementation of conductive polymer as in-fiber current buses is shown to enable distributed light sensing and modulation along a single fiber, by inducing transmission-line effects in d.c. and a.c. operation. Next, the design and operation of a photosensing fiber specially treated to detect explosives is presented, and the sensitivity of this fiber device is shown to meet state-of-the-art industry standards. A novel large-interface-area design for dielectric fibers is then presented, which enables both energy storage in flexible fiber capacitors as well as enhanced acoustic transduction in piezoelectric fibers. The flexibility as well as the assembly into arrays of the latter are shown to enable the shaping of a pressure field in all three dimensions of space. Finally, a novel thermal-gradient capillary breakup process for silica-based fibers is shown, enabling the fabrication of silicon-in-silica micro spheres and rectifying devices. Taken as a whole, these new capabilities greatly expand the breadth of functionality of multimaterial fibers, further paving the way towards highly multifunctional, wholly integrated electronic fiber devices and fabrics that can collect, store and transduce energy in all of its forms.
by Guillaume Lestoquoy.
Ph. D.
Hase, Yoshiko M. B. A. Massachusetts Institute of Technology. "Automotive electronics business." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39526.
Full textIncludes bibliographical references (leaf 96).
In the automotive industry, due to the trend to introduce active safety systems, concerns about protecting the environment, and advances in information technology, key automotive manufacturers are eager to acquire new enabling technologies which can provide solutions for these issues. As a result, the demand for automotive electronics is increasing. Meanwhile, due to strict requirements for demanding specifications, as well as low volume commitment offered by car manufacturers as compared with consumer electronics products, many electronics manufacturers have so far avoided entering this business. However, as the requirement for high technology grow, the technology of the electronics companies becomes indispensable for the car manufacturers. Currently, there are some electronics companies who provide automotive parts, mostly on the components level and not on the solution level, but only few of them are truly successful. The automotive electronics business requires various types of components as well as demanding specifications for safety and operating conditions. Offering solutions for this demanding industry often requires cross-organizational initiative.
(cont.) Despite the difficult challenges, many electronics companies, including semiconductor and fabless companies, have already penetrated into this industry, and its market is becoming more and more competitive. The purpose of this work is to discuss the potential of Toshiba Corporation to become a major player in the automotive electronics industry. While it seems to be attractive, there are also many challenges which would face Toshiba as a new player attempting to penetrate this market. The work will focus on the understanding and analysis of these challenges. The work will start from a general description of the current automotive electronics industry. Following, I will discuss the future technological trends of automotive electronic systems and the demands and requirements of the different geographical markets. Following this general background, Toshiba's current market position and a comparison to the key competitors is presented. The work will be concluded with a discussion of the optional strategies which can be adopted by Toshiba if it decides to focus on the automotive market.
by Yoshiko Hase.
M.B.A.
Peters, Ben. "Switchable molecular electronics." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497070.
Full textWickstrom, Larry E. "Reliability of Electronics." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc700024/.
Full textScenev, Vitalij. "Electronic properties of graphene and other carbon-based hybrid materials for flexible electronics." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2014. http://dx.doi.org/10.18452/17069.
Full textThis work focusses on the electronic properties of graphene on the one hand, and on the application of graphenes and other carbon-based hybrid materials for transparent electrodes on the other hand. Accordingly, the first part of the work, which is the larger one, is of fundamental nature and focusses on the electronic interaction between graphene and mica as a substrate. The second, smaller part deals with the design of novel conductive inks based on graphene and other carbon-based hybrid materials for applications in printed electronics, in particular for the production of transparent electrodes. Graphene on mica is a very well defined system, which provides atomically flat graphene extending over several square micrometers. Layer-dependent surface potential variations of single and few layered graphenes on mica were probed with Kelvin Probe Force Microscopy. This allowed to estimate the screening length of graphene on mica. Local variations of the surface electrostatic potential above single layer graphene, originating from confined fluid interfacial monolayers of water between the mica and the graphene, were monitored with Scanning Force Microscopy, Electrostatic Scanning Force Microscopy and Raman spectroscopy. This allowed to quantify the doping of graphene by the confined water layers. Exfoliation of graphene onto adsorbed nanostructures on mica allowed to control the strain of graphene at the nano-scale. Nanostructuring was achieved by first coating mica with submonolayers of dendronized polymers of different generations and subsequently depositing graphene. This approach provides new opportunities for the control of the electronic properties of graphene by strain.Finally, novel conducting carbon-based inks were designed and transparent electrodes were fabricated therefrom. The formulations of the inks were optimized for printing on plastic substrates.
Liao, Haifeng Felix. "Industrial cluster of Taiwanese electronics firms in Dongguan, China." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39556943.
Full textYuan, Ren. "On the study of high DR multi-channel stage-shared hybrid front-end for integrated power electronics controller." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691761.
Full textKim, Sung Hwan 1965. "Product development strategy for LG Electronics in optical storage-based consumer electronics." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17865.
Full textIncludes bibliographical references (leaves 87-88).
With the dawning of the digital era, many home electronic products are emerging. One of the fastest growing and most wide-spread products in the market is the DVD player. Few digital products have achieved as fast a market penetration, and with as rapid a price drop, as the DVD player. This thesis touches on the product development strategy for my company, LG Electronics, in terms of short-range and mid (long)-range plan, specifically on means to sustain and keep the profit margin reasonable in spite of the current competitive market situation. The system dynamics tool is used as a method of analysis and assessment on the current DVD player market situation. Based on the results of the analysis, I propose the following strategies, in terms of products and technologies, for LG Electronics to maintain sustainable growth in the industry. Firstly, in terms of mid-range plan, the company should broaden its DVD product scope and make profit by adding value. Secondly, in terms of long-range plan, the company should draw a big picture for further growth by taking into account the development of new disruptive technologies and products in the industry.
by Sung Hwan Kim.
S.M.M.O.T.
Kamasani, Jyotheesh Reddy, Uday Suhas Nakkapalli, and Sai Jaswanth Yadala. "Arduino Based Home Electronics Labs : Basic- & Advanced-Electronics and Sensors Approaches." Thesis, Blekinge Tekniska Högskola, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20034.
Full textCarroll, Richard Lloyd. "Studies of the Structural and Electronic Properties of Self-Assembled Monolayers ? Towards Molecular Electronics." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010709-120336.
Full textThe field of Molecular Electronics (ME) is growing at a rapid pace. The study of materials that have utility at the level of several, or single, molecules is exciting becausethe development of these sorts of systems offers a pathway to potentially avoid the perils of continually shrinking Silicon-based fabrication. This work examines the state of the art in fabrication techniques for semiconductor systems, then examines current examples of ME to be found in the academic literature. This review is designed to plumb the depths of a few important demonstrations, as opposed to a broad overview of the entire body of work. Further, scanning probe lithography techniques are demonstrated that allow for the study of small ensembles of interesting molecules in isolation. By utilizing these techniques, the structural and electronic properties of molecules can be studied, with a focus towards determining the likely utility of a particular species in a ME framework. Experimental study of redox-active self-assembled monolayer (SAM) films shows that under specific conditions, some films display a negative differential resistance (NDR) response that has possible utility in the development of ME devices. Ferrocene- and galvinol-terminated SAMs both show NDR at room temperature. A possible mechanism for the NDR behavior is believed to be resonant tunneling through low-lying, accessible redox-states in the molecule.
Chun, Yoonjong. "The impact of electronic commerce on buyer-supplier relationships in the Korean electronics industry." Thesis, University of Leeds, 2004. http://etheses.whiterose.ac.uk/2613/.
Full textNeff, Clayton. "Analysis of Printed Electronic Adhesion, Electrical, Mechanical, and Thermal Performance for Resilient Hybrid Electronics." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7551.
Full textBallister, Stephen C. McKelvey Dennis J. "Shipboard electronics thermoacoustic cooler /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA300514.
Full textThesis advisor(s): Steven L. Garrett. Graduation date for Dennis J. McKelvey, September 1995. "June 1995." Bibliography: p. 93-94. Also available online.
Kristoffersen, Andreas Hoon Wenaas. "Sub Sea Power Electronics." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9552.
Full textSub sea compression for maintaining reservoir pressure in a gas field is important to have a steady production of gas as it is extracted from the field. Electrical drives in the several megawatt range are suitable to control the compressor motor since it is not desirable to have gears which need maintenance. Problems related to the location on the sea bed have so far been overcome by using massive pressure tanks which hold 1 atmosphere. A new approach would be to allow the pressure on the sea bed to be applied on the electrical components. This will reduce and simplify the system only needing a thin walled casing filled with oil to contain the electronics, but the electronic components then need to be compatible with the oil and function at high hydrostatic pressure. This report include suitable electrical power systems for a compression application, theory around the most likely to be used switch, some available modules and an experimental set up for testing IGBT compatibility with oil. Converters consisting of rectifiers and inverters are widely used in industrial motor drives and it is assumed that such a converter will be used consisting of a diode bridge rectifier and a neutral point clamped inverter. High voltage applications often operate with voltages above the rated value of many semiconductor components which means that switches must be series connected. A neutral point clamped inverter with series connected switches will be able to handle the high voltages and produce a good spectral output to the motor terminals. The switches used in the inverter will probably be IGBTs. The IGBT evolved as the most successful device for high power, high switching frequency applications blending MOSFET switching capabilities with BJT on-state conduction properties. Development has produced a lot of versions of this kind of switch, and by modifying doping profiles and geometrical properties a set of devices with improved characteristics has been made. Packaging techniques make it possible to integrate the switches in different environments. Examples are the press pack modules which can be hermetically sealed and the standard DBC solutions. To test compatibility with insulating oil, an experiment was set up. An IGBT inverter leg module was placed inside a tank which was filled with oil. The module was operated in an H-bridge configuration with another bridge leg on the outside of the tank. Thorough testing before submerging it was performed to ensure and document normal behaviour. When fully submerged the module was tested and the results compared with those from the initial testing. Short duration of continuous switching was also performed followed by intermittent operation with current pulses and long term continuous switching. None of the captured scope pictures or temperature measurements showed deviation from normal IGBT behaviour or change of characteristics. It can then be concluded that when submerging an IGBT module in insulating oil, no instant failure or change of electrical behaviour occurs.
Holt, Øystein. "Pressure Tolerant Power Electronics." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9844.
Full textThe thermal behaviour of an IGBT module was investigated, especially with respect to the module being immersed in dielectric oil. An equivalent thermal model was built using thermal transients and network synthesis. The thermal behaviour was further investigated using thermocamera measurements and simple finite element models. Passive pressure testing of electronic components relevant for the test setup was performed. The testing showed no significant influence on the electrical behaviour of the components. An IGBT module without gel covering the chips was switched while immersed in dielectric oil. The switching transients were compared to the case of a normal module switching in air. Only minor differences were found between the switching waveforms from the two cases. A test was performed where water was added to the dielectric oil in order to reduce the breakdown voltage of the oil. No breakdown phenomena were observed for the voltages that were tested. A brief litterature study regarding stray inductance considerations in the test setup was performed.
L'Hereec, Frederic. "Solid state chemical electronics." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5341.
Full textKooistra, Floris Berend. "Fullerenes for organic electronics." [S.l. : Groningen : s.n. ; University Library of Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/305161504.
Full textLarade, Brian. "Theory of molecular electronics." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38496.
Full textWe start with a detailed analysis of transport through carbon atomic wires, and find that the equilibrium conductance is sensitive to charge transfer doping, and that the I-V characteristics exhibit negative differential resistance at high bias due to a shift of conduction channels relative to the states of the electrodes.
Using a Sc3N C80 metallofullerene device, we address several general questions about quantum transport through molecular systems and provide strong evidence that transport in such molecular devices is mediated by molecular electronic states which have been renormalized by the device environment.
The possibility of inducing nuclear dynamics in single-molecule Au-C 60-Au transistors via inelastic, resonance-mediated tunneling current is examined using a method based on the combination of a theory of current-triggered dynamics[1] and our nonequilibrium Green's function approach of computing electron transport properties.
We investigate several single molecule field-effect transistors consisting of conjugated molecules in contact with metallic electrodes. The source-drain current is found to be sensitive to the external gate potential and the molecular structure; with modulations of the current as large as several thousand fold.
Given a proposed operation principle, we obtain quantitative results on the rectification properties for an organic molecule rectifying diode. The I-V characteristic shows clear rectification behavior, and is explained from the simple picture of shifting of molecular levels due to substituents and an externally applied bias voltage.
Finally, we report a formulation combining density functional theory with the Keldysh nonequilibrium Green's function, for calculating quantum mechanical forces under external bias and during electron transport. We present an example force calculation consisting of a single atom point contact.
Herring, Patrick Kenichi. "Low Dimensional Carbon Electronics." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11475.
Full textPhysics
Was, Loïc. "Mechanical Engineering for Electronics." Thesis, KTH, Hållfasthetslära (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103785.
Full textBallister, Stephen C., and Dennis J. McKelvey. "Shipboard electronics thermoacoustic cooler." Thesis, Monterey, California. Naval Postgraduate School, 1995. http://hdl.handle.net/10945/31400.
Full textNord, Axel, and Zhao Yiqing. "Immersed Cooling of Electronics." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194367.
Full textПочатко, Тетяна Володимирівна, Татьяна Владимировна Початко, Tetiana Volodymyrivna Pochatko, and I. Yeskov. "The history of electronics." Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/16942.
Full textMilosavljevic, Ivana. "Power Electronics System Communications." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31218.
Full textMaster of Science
L'Héréec, Frédéric. "Solid state chemical electronics." Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04062004-164713/unrestricted/lhereec%5Ffrederic%5F200312%5Fms.pdf.
Full textRuggles, Tikhon(Tikhon James). "Electronics first : development of a basic electronics course of study for naval engineers." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127048.
Full textThesis: S.M. in Naval Architecture and Marine Engineering, Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 109-110).
MIT's 2N program produces naval engineers for the U.S. Navy. It provides its students with a solid foundation of critical engineering, design, construction, and naval architecture concepts. However, within that curriculum, there is less of an emphasis on electrical engineering and electronics as it applies to shipboard systems. The purpose of this project is to outline a new course of study centered around laboratory assignments designed especially for the 2N program that will provide an accelerated introduction to electronics and electrical engineering for the naval engineer.
by Tikhon Ruggles.
Nav. E.
S.M. in Naval Architecture and Marine Engineering
Nav.E. Massachusetts Institute of Technology, Department of Mechanical Engineering
S.M.inNavalArchitectureandMarineEngineering Massachusetts Institute of Technology, Department of Mechanical Engineering
Mowery, Jeffrey Philip. "A performance management feasibility study for a defense based electronics manufacturing organization." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020052/.
Full textPascarella, Nathan William. "Advanced encapsulation processing for low cost electronics assembly." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19031.
Full textWeage, Joshua Paul. "A time-resolved analysis of the rate-dependent behavior of PZT ceramics." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16921.
Full textKock, Lotter. "Analysis and performance of antenna baluns." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50255.
Full textENGLIAH ABSTRACT: Data transmission plays a cardinal role in today's society. The key element of such a system is the antenna which is the interface between the air and the electronics. To operate optimally, many antennas require baluns as an interface between the electronics and the antenna. This thesis presents the problem definition, analysis and performance characterization of baluns. Examples of existing baluns are designed, computed and measured. A comparison is made between the analyzed baluns' results and recommendations are made.
AFRIKAANSE OPSOMMING: Data transmissie is van kardinale belang in vandag se samelewing. Antennas is die voegvlak tussen die lug en die elektronika en vorm dus die basis van die sisteme. Vir baie antennas word 'n balun, wat die elektronika aan die antenna koppel, benodig om optimaal te funktioneer. Die tesis omskryf die probleemstelling, analiese en 'n prestasie maatstaf vir baluns. Prakties word daar gekyk na huidige baluns se ontwerp, simulasie, en metings. Die resultate word krities vergelyk en aanbevelings word gemaak.
Van, Niekerk Philip Charl. "A Cryogenic CMOS-based Control System for Testing Superconductor Electronics." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1338.
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