Dissertations / Theses on the topic 'Basics of Electrical Engineering'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Basics of Electrical Engineering.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Olshewsky, Avron Bernard. "The application of neural networks to communication channel equalisation : a comparison between localised and non-localised basis functions." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/9472.
Full textNeural networks have been applied to a number of problems over the past few years. One of the emerging applications of neural networks is adaptive communication channel equalisation. This area of research has become prominent due to the reformulation of the equalisation problem as a classification problem. Viewing equalisation as a classification problem allows researchers to apply the knowledge gained from other fields to equalisation. A wide variety of neural network structures have been suggested to equalise communication channels. Each structure may in turn have a number of different possible algorithms to train the equaliser. A neural network is essentially a non-linear classifier; in general a neural network is able to classify data by employing a non-linear function. The primary subject of this dissertation is the comparative performance of neural networks employing non-localised basis (non-linear) functions (Multi-layer Perceptron) versus those employing localised basis functions (Radial Basis Function Network).
LaMacchia, Brian A. (Brian Andrew). "Basis reduction algorithms and subset sum problems." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13277.
Full textIncludes bibliographical references (leaves 86-89).
by Brian A. LaMacchia.
M.S.
Labrada, Carlos Ramón 1977. "Lightning/percipitation relationships on a global basis." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9467.
Full textIncludes bibliographical references (p. 93-94).
Rainfall and lightning are measured and compared on a global basis using data gathered from the Tropical Rainfall Measuring Mission (TRMM) satellite, launched in November 1997. The satellite provides simultaneous lightning-precipitation measurements that allow for comprehensive relationships to be created for future rainfall monitoring utilizing unique electromagnetic methods. Precipitation and lightning comparisons using TPMM data showed that there is no unique relationship between lightning and near surface rainfall. No definite bimodality over land was found that indicated distinct regimes; however, maps of the mass of precipitation per flash showed a latitudinal dependence in both South America and Africa indicative of different regimes. Reflectivity-height distribution plots established reflectivity thresholds at 7 km and l O km where lightning over land completely dominates lightning over ocean. For reflectivity greater than 25 dBZ at 7 km altitude over land, there is 87% probability it will produce lightning. Ocean, on the other hand, requires higher than 35 dBZ at 7 km to generate lightning with a probability of 77%. Venn diagrams determined that lightning is not a good choice for measuring precipitation on a global scale when less than 6% of all precipitating clouds exhibit lightning. For precipitating clouds over land, lightning appears in 15% of the clouds at 2 km altitude. Lightning may be better suited for measuring rainfall over land. The mass of precipitation[kg] per lightning flash was found to be highly variable, with values ranging over four orders of magnitude. Correlation coefficients of scatter plots of mass of precipitation versus lightning rate confinned a non-unique relation between precipitation and lightning for rain measured near the surface (2km, 4 km), with numbers close to 0. The correlation coefficients increased to 0.5 for altitudes 7 km and above. The kg per flash values addressed the issue of an order of magnitude difference in lightning between continental and oceanic convection. This finding is consistent with the idea of mid-level updrafts being larger in continental than oceanic convective clouds.
by Carlos Ramón Labrada.
M.Eng.
Gu, Huanhuan. "Computed basis functions for finite element analysis based on tomographic data." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107699.
Full textCette thése propose une nouvelle technique pour trouver les champs électromagnétiques lorsque le domaine de calcul est défini par un dense quadrillage de pixels (2D) ou voxels (3D). Un scénario qui arrive souvent dans le domaine de bioelectromagnetic, puisque les géométries des tissus sont généralement obtenues par tomographie.La technique proposée dans cette thése est une méthode des éléments finis dans laquelle, chaque élément 3D est un ensemble de p × p × p voxels (p est un nombre entier). Par conséquent, cette technique évite la difficile tâche de l'extraction de surface et de maillage. Comme un élément peut être composé de différents matériaux, les fonctions de base classiques ne sont plus pertinentes. Ainsi, les fonctions de base sont calculées en utilisant les grilles de voxels, afin de respecter des discontinuités internes. L'idée est d'abord testée sur des problèmes comprenant des carrés imbriqués (2D) et des cubes (3D) de diélectrique, avec une paire de charge placée à l'intérieur. Les résultats obtenus en utilisant différentes tailles d'élément (p) sont en bon accord avec ceux obtenus par un logiciel commercial: pour p = 4, la différence quadratique moyenne (RMS) est 1,5% du potentiel maximum. Ensuite, la nouvelle méthode est appliquée pour résoudre un problème électroencéphalographie (EEG), dans lequel la tête est modélisée par un volume conducteur et l'activité neuronale par des dipôles. Le modèle de tête se compose de 180×217×181 voxels. Le potentiel électrique calculée est échantillonné sur un contour sur le côté extérieur du cuir chevelu, pour différentes tailles d'élément, p. Ces résultats sont toujours en bon accord avec une solution de référence: pour p = 4, la quadratique moyenne (RMS) est d'environ 1% du potentiel maximum. Résoudre un problème des éléments finis avec p = 4 est 4,7 fois plus rapide que le cas que chaque voxel est considéré comme un seul élément, c'est à dire, p = 1. Lorsque le résoudre pour plusieurs côtés droits est recherché, qui est vrais dans plupart des cas, l'accélération est plus grande. Par exemple, avec 24 côtés droits, la solution pour p = 4 est 40 fois plus rapide que le cas de p = 1.
Biswas, Amartya Shankha. "Local-access generators for basic random graph models." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119600.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 61-64).
Consider a computation on a massive random graph: Does one need to generate the whole random graph up front, prior to performing the computation? Or, is it possible to provide an oracle to answer queries to the random graph "on-the-fly" in a much more efficient manner overall? That is, to provide a local access generator which incrementally constructs the random graph locally, at the queried portions, in a manner consistent with the random graph model and all previous choices. Local access generators can be useful when studying the local behavior of specific random graph models. Our goal is to design local access generators whose required resource overhead for answering each query is significantly more efficient than generating the whole random graph. Our results focus on undirected graphs with independent edge probabilities, that is, each edge is chosen as an independent Bernoulli random variable. We provide a general implementation for generators in this model. Then, we use this construction to obtain the first efficient local implementations for the Erdös-Rényi G(n, p) model, and the Stochastic Block model. As in previous local-access implementations for random graphs, we support VERTEX-PAIR, NEXT-NEIGHBOR queries, and ALL-NEIGHBORS queries. In addition, we introduce a new RANDOM-NEIGHBOR query. We also give the first local-access generation procedure for ALL-NEIGHBORS queries in the (sparse and directed) Kleinberg's Small-World model. Note that, in the sparse case, an ALL-NEIGHBORS query can be used to simulate the other types of queries efficiently. All of our generators require no pre-processing time, and answer each query using O(poly(log n)) time, random bits, and additional space.
by Amartya Shankha Biswas.
M. Eng.
Mitsouras, Dimitrios 1976. "Near real-time 2D non-Fourier basis MRI." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86546.
Full textIncludes bibliographical references (p. 114-118).
by Dimitrios Mitsouras.
S.M.
Oberoi, Pankaj. "Sine-wave amplitude coding using wavelet basis functions." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38767.
Full textVarghese, Mathew 1973. "Reduced-order modeling of MEMS using modal basis functions." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8342.
Full textIncludes bibliographical references (p. 80-84).
The field of MEMS has matured significantly over the last two decades increasing in both complexity and level of integration. To keep up with the demands placed by these changes requires the development of computer-aided design and modeling tools (CAD/CAM) that enable designers to reduce the time and cost it takes to produce working prototypes. An ideal scenario is one in which a designer is able to quickly model and simulate an entire microsystem - sensors, actuators and electronics -- with the certainty that their results will match that of physical prototypes. This vision of design requires the existence of system level models of MEMS devices that can capture the complex non-linear coupling between multiple physical domains, yet be sufficiently fast and compact in form to insert into a system dynamics simulator. In this thesis I explore techniques of automatically constructing such models from meshed representations of device geometry. These dynamical models are known as "reduced-order" models or "macromodels." They are characterized by few degrees of freedom (DOF), and a small set of state equations. Our process for constructing macromodels is built upon two well-established methodologies - normal mode superposition and Lagrangian mechanics. This is referred to as the "CHURN process" and was originally developed by Gabbay et al. to create models of electromechanical devices with two electrodes under conditions satisfying linear mechanics.
(cont.) In this thesis I significantly extend this process to model multi-port magnetostatic devices, multi-port electrostatic devices, and geometrically non-linear mechanical devices exhibiting stress stiffening. I also address one of the key concerns in building macromodels -- the required degree of sophistication, and the extent of involvement, of a designer in the model construction process. I propose and implement several heuristic techniques that automate the model generation process. I also apply these techniques to a fabricated microelectromechanical high frequency filter and present verification of our modeling results.
by Matthew Varghese.
Ph.D.
Joffe, Neil Raymond. "A study of multilevel partial response signalling for transmission in a basic supergroup bandwidth." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/8334.
Full textThe work in this thesis is primarily directed toward the design, construction and testing of an experimental multilevel partial response signalling baseband system. The system will find practical application in existing frequency division multiplexed-frequency modulated microwave links. The basic supergroup bandwidth of these links is 240 kHz. The design requires a transmission rate of 1.024 Mb/s in this bandwidth. Class-4 15 partial response signalling is the coding technique suitable to achieve this. A pilot tone scheme is used to facilitate symbol timing recovery at the demodulator. A sixth order Butterworth low pass filter approximates the ideal raised-cosine Nyquist channel. A theoretical discussion on impairments caused by deviation from this channel is given. Since the experimental system was non-ideal, it produced a degradation in the channel signal to noise ratio. This degradation, coupled with other factors, showed that further development was necessary for the system to be suitable for connection into an existing microwave link.
Hutchinson, James M. "A radial basis function approach to financial time series analysis." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12216.
Full textIncludes bibliographical references (p. 153-159).
by James M. Hutchinson.
Ph.D.
Lee, Ken Wenchian. "Basic spline wavelet transform and pitch detection of a speech signal." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36467.
Full textIncludes bibliographical references (leaves 125-133).
by Ken Wenchian Lee.
M.S.
Golubović, Boris 1967. "Basic module for an integrated optical phase difference measurement and correction system." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/37996.
Full textChen, Judy Y. (Judy Yann-Yun) 1980. "Distributed coordination of autonomous agents by communicating on a need-to-know basis." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17940.
Full textIncludes bibliographical references (leaves 105-108).
Intelligent autonomous agents working cooperatively accomplish tasks more efficiently than single agents, as well as tasks that were infeasible for the single agent. For example, a single agent transporting a ton of blocks will need to take multiple trips, possibly even more trips than it can make, and will take longer than several agents transporting the blocks in parallel. Unexpected events can result in the need for agents to change their plans in order to adapt. During replanning, the expense of communication can hinder the amount of information passed. In this thesis, agents reduce the communication load while adapting to environmental events by examining what changes will be made to teammate plans and by passing information only on a need-to-know basis. More specifically, in this thesis, we describe a method whereby cooperating agents use identical planners and knowledge of the other agents' capabilities in order to pass information about the environmental conditions they observe that are necessary for their teammates to infer the correct actions to take. The agent must also pass conditions only to the teammates who are affected by the changes. Given that not all agents will have the same information about environmental conditions, the plans inferred by each agent may be different from their teammates. The Pertinent Information Planning (PIP) algorithm provided seeks to allow each agent to have an incorrect plan with respect to other agents but gives each agent a correct plan with respect to the actions that they perform. In order to determine the conditions that agents communicate, agents must repair their local plan and figure out which sets of actions have changed in the repaired plan. This thesis provides the
(cont.) procedures for repairing the local plans and for determining the minimal set of information to be communicated between agents and the minimal set of agents who need to know this information. This thesis also explains how the agents who need to know update their local plans. Finally, the thesis presents the results of a computer simulation for three test cases of a pedagogical cooperative space exploration example.
by Judy Y. Chen.
M.Eng.
Liu, Tianren S. M. Massachusetts Institute of Technology. "On basing private information retrieval on NP-hardness." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106093.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 17-19).
The possibility of basing the security of cryptographic objects on the (minimal) assumption that NP ... BPP is at the very heart of complexity-theoretic cryptography. Most known results along these lines are negative, showing that assuming widely believed complexity-theoretic conjectures, there are no reductions from an NP-hard problem to the task of breaking certain cryptographic schemes. We make progress along this line of inquiry by showing that the security of single-server single-round private information retrieval schemes cannot be based on NP-hardness, unless the polynomial hierarchy collapses. Our main technical contribution is in showing how to break the security of a PIR protocol given an SZK oracle. Our result is tight in terms of both the correctness and the privacy parameter of the PIR scheme.
by Tianren Liu.
S.M.
Lee, Dongjin 1956. "Automatic development of circuit and interconnection equations on the basis of topology and library of network components: SPICE approach." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277894.
Full textAlexander, Roger Kirk. "A protocol for high speed optical networks from a basis of satellite protocol designs." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13946.
Full textIncludes bibliographical references (leaves 144-150).
by Roger Kirk Alexander.
M.S.
Hsiao, Yu-Chung Ph D. Massachusetts Institute of Technology. "FastCaplet : an efficient 3D capacitance extraction solver using instantiable basis functions for VLSI interconnects." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62449.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 62-65).
State-of-the-art capacitance extraction methods for Integrated Circuits (IC) involve scanning 2D cross-sections, and interpolating 2D capacitance values using a table lookup approach. This approach is fast and accurate for a large percentage of IC wires. It is however quite inaccurate for full 3D structures, such as crossing wires in adjacent metal layers. For such cases electrostatic field solvers are required. Unfortunately standard field solvers are inherently very time-consuming, making them completely impractical in typical IC design flows. Even fast matrix-vector product approaches (e.g., fastmultipole or precorrected FFT) are inefficient for these structures since they have a significant computational overhead and scale linearly with the number of conductors only for much larger structures with more than several hundreds of wires. In this talk we present therefore a new 3D extraction field solver that is extremely efficient in particular for the smaller scale extraction problem involving the ten to one hundred conductors in the 3D structures that cannot be handled by the 2D scanning and table look up approach. Because of highly restrictive design rules of the recent sub-micro to nano-scale IC technologies, smooth and regular charge distributions extracted from simple model structures can be stored beforehand as "templates" and instantiated and stretched to fit practical complicated cases as basis function building blocks. This "template-instantiated" strategy largely reduces the number of unknowns and computational time without additional overhead. Given that all basis functions are obtained by the same very few stretched templates, Galerkin coefficients can be readily computed from a mixture of analytical, numerical and table lookup approaches. Furthermore, given the low accuracy (i.e., 3%-5%) required by IC extraction and the specific aspect ratios and separations of wires on ICs, we have observed in our numerical experimentations that edge and corner charge singularities do not need to be included in our templates, hence reducing the complexity of our solver even further.
by Yu-Chung Hsiao.
S.M.
Yates, Alice M. (Alice Meri). "Autonomous energy efficiency improvements : relevance, use, and empirical basis for global climate change policy analysis." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11455.
Full textHu, Xin 1979. "The use of conduction mode basis functions in surface integral formulation for wideband impedance extraction." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/87356.
Full textDupaix, Brian P. "Correlator for a Basis-Space Architecture Ultra-Wideband Receiver." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366199620.
Full textChatburn, Robert. "Determining the Basis for a Taxonomy of Mechanical Ventilation." Youngstown State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1277403555.
Full textLundbeck, Kim, and Wille Eriksson. "Graph Learning as a Basis for Image Segmentation." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295622.
Full textGrafsignalbehandling är ett ämnesområde vars syfte är att behandla grafer med data associerat till deras noder, ofta inom nätverksmodelleringen. Inom detta område pågår aktiv forskning med att utveckla tekniker för att konstruera graftopologier från sådana data. Dessa tekniker kan vara användbara när man vill representera ett fenomen med grafer, men då uppenbara grafstrukturer inte finns tillgängliga. Syftet med detta projekt var att utvärdera användbarheten hos en sådan teknik när den appliceras inom bildsegmentering. Metoden som användes bestod i att konstruera grafrepresentationer av bilder med hjälp av denna teknik, för att sedan behandla dessa med en etablerad, grafbaserad segmenteringsalgoritm. Resultaten påvisar att detta tillvägagångssätt under rätt förutsättningar kan producera tillfredsställande bildsegmenteringar. Dock är implementeringen som nyttjats i projektet betydligt långsammare än de metoder som vanligen används inom området. Ett antal förslag till prestandaförbättring utpekas, och kan vara föremål för framtida studier.
Kandidatexjobb i elektroteknik 2020, KTH, Stockholm
Stephanson, Matthew B. "An Adaptive, Black-Box Model Order Reduction Algorithm Using Radial Basis Functions." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345226428.
Full textKamasani, 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 textAmsler, Christopher. "The effects of hardware acceleration on power usage in basic high-performance computing." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13742.
Full textDepartment of Electrical Engineering
Dwight Day
Power consumption has become a large concern in many systems including portable electronics and supercomputers. Creating efficient hardware that can do more computation with less power is highly desirable. This project proposes a possible avenue to complete this goal by hardware accelerating a conjugate gradient solve using a Field Programmable Gate Array (FPGA). This method uses three basic operations frequently: dot product, weighted vector addition, and sparse matrix vector multiply. Each operation was accelerated on the FPGA. A power monitor was also implemented to measure the power consumption of the FPGA during each operation with several different implementations. Results showed that a decrease in time can be achieved with the dot product being hardware accelerated in relation to a software only approach. However, the more memory intensive operations were slowed using the current architecture for hardware acceleration.
Bancal, Sylvain. "Basic design of an HVDC interconnection in Brazil." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187693.
Full textHVDC är en mycket effektiv teknik för kraftöverföring av elektrisk energi på långa avstånd, men ställer generellt stora krav på hur man genomför en effektiv konfiguration. Denna avhandling föreslår en del av en optimeringsprocess för att bestämma en optimal konfiguration för en HVDC-anläggning. Det som betonas i denna rapport är effekterna av val av ledare och design av filter. Ledarvalet, inklusive val av spänning, kräver en prognostisering av energikostnadernasutvecklingen för att optimera designen och göra en känslighetsanalys för att utvärdera effekterna av dessa faktorer på den slutliga utformningen. Tillvägagångssättet för ledarval gjorde det möjligt att fastställa de viktigaste parametrarna att välja en ledare som är radien och antal delledare. Olika typer av ledare och konfigurationer jämfördes med olika scenario för energikostnaden för att bestämma denmest ekonomiska ledaren. Filterdesignen är en fråga som berör både de inre komponenterna och AC komponenter i HVDC-stationen, men kan också betraktas som en optimeringsprocess, med avseende på de totala förlusterna av filtren och total harmonisk distorsion och med hjälp av en minimax tillvägagångssätt. Optimeringsstrategin som bygger på en Newton-Raphsons algoritm, gjorde det möjligt att fastställa en optimal kombination av filter för att ta hänsyn till alla effektområden i HVDC-förbindelsen. Det observerades att även om det faktiska valet för konstruktionen var nära den slutliga utformning som valdes, så var den inte optimala för låga övertoner.
Flake, John T. "Application of the Relevance Vector Machine to Canal Flow Prediction in the Sevier River Basin." DigitalCommons@USU, 2007. https://digitalcommons.usu.edu/etd/272.
Full textSélea, Isac, and Håkan Thorleifsson. "Decision making for the design of solar cars and basis for drivingstrategy : General estimation of recommended mean speed for solar cars." Thesis, Jönköping University, JTH, Avdelningen för datateknik och informatik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54229.
Full textNacev, Aleksandar Nelson. "Magnetic drug targeting| Developing the basics." Thesis, University of Maryland, College Park, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3587279.
Full textFocusing medicine to disease locations is a needed ability to treat a variety of pathologies. During chemotherapy, for example, typically less than 0.1% of the drugs are taken up by tumor cells, with the remaining 99.9% going into healthy tissue. Physicians often select the dosage by how much a patient can physically withstand rather than by how much is needed to kill all the tumor cells. The ability to actively position medicine, to physically direct and focus it to specific locations in the body, would allow better treatment of not only cancer but many other diseases.
Magnetic drug targeting (MDT) harnesses therapeutics attached to magnetizable particles, directing them to disease locations using magnetic fields. Particles injected into the vasculature will circulate throughout the body as the applied magnetic field is used to attempt confinement at target locations. The goal is to use the reservoir of particles in the general circulation and target a specific location by pulling the nanoparticles using magnetic forces.
This dissertation adds three main advancements to development of magnetic drug targeting. Chapter 2 develops a comprehensive ferrofluid transport model within any blood vessel and surrounding tissue under an applied magnetic field. Chapter 3 creates a ferrofluid mobility model to predict ferrofluid and drug concentrations within physiologically relevant tissue architectures established from human autopsy samples. Chapter 4 optimizes the applied magnetic fields within the particle mobility models to predict the best treatment scenarios for two classes of chemotherapies for treating future patients with hepatic metastatic breast cancer microtumors.
Sadiqi, Mahdi. "Basic design and cost optimization of a hybrid power system in rural communities in Afghanistan." Kansas State University, 2012. http://hdl.handle.net/2097/13824.
Full textDepartment of Electrical and Computer Engineering
Anil Pahwa
In Afghanistan, electricity is mostly generated by hydroelectric, diesel and natural gas generators. A significant amount of electricity also is imported from neighboring countries. Accessibility of electricity is mostly limited to the capital and main towns. The government of Afghanistan and other development organizations, such as The United States Agency for International Development (USAID) and Deutsche Gesellschaft für Internationale Zusammenarbeit (German Agency for International Cooperation “GIZ”), are striving to develop accessibility of electricity to remote communities by supporting the local population of people to enhance living conditions. Although some of these remote communities are served by local diesel fuel generators for just a couple of hours during the night, still most communities do not have access to electricity and they are using wood and kerosene as major sources of energy in cooking, heating and lighting. For those remote communities who are served by local diesel fuel generators, the cost of electricity is much higher than from the national grid. On the other hand, grid extensions are too expensive and, in some cases, impossible for such communities because of the geographical features of Afghanistan. Afghanistan is a mountainous country which receives a significant amount of snow during the winter and once it melts the water runs into rivers, lakes and streams. Therefore mostly it does not face any shortage of running water during the year. Also Afghanistan has plentiful wind and solar energy. Therefore, small hydro-power, wind turbine and solar energy are attractive renewable energy sources for remote communities. The development of such a hybrid power system is a complex process and technical expertise is essential in design and construction phases. The main challenges are the high cost of civil works and equipment, technical expertise for design and construction and encouragement of local people for the support of the project. This report will give an insight into design, cost-effectiveness and feasibility of the system using HOMER in order to encourage private investors and local community people to take advantage of this potential available in Afghanistan and be convinced of the sustainability for investments in micro-hydropower, wind and solar.
Halman, Jennifer I. "On the Use of Physical Basis Functions in a Sparse Expansion for Electromagnetic Scattering Signatures." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1395910435.
Full textDu, Shichuan. "A Computational Model of the Production and Perception ofFacial Expressions of Basic and Compound Emotions." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405989041.
Full textWaddel, Taylor Matt. "A Design Basis for Composite Cascode Stages Operating in the Subthreshold/Weak Inversion Regions." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/2934.
Full textSchmidt, Aurora C. "Scalable Sensor Network Field Reconstruction with Robust Basis Pursuit." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/240.
Full textTimmermann, Dion [Verfasser]. "Engineering students' understanding of basic electric circuit concepts and the effect of qualitative worksheets / Dion Timmermann." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2020. http://d-nb.info/121996350X/34.
Full textShao, Qiliang. "FPGA Realization of Low Register Systolic Multipliers over GF(2^m)." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1481808131971019.
Full textBaranauskas, Andrius. "Automatizuota teorinių tyrimų terpė naudojanti simbolinius skaičiavimus ir žinių bazes." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040611_105712-37138.
Full textYilmaz, Ayhan Ozan. "Rf Coil System Design For Mri Applications In Inhomogeneous Main Magnetic Field." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608477/index.pdf.
Full textthe tuning and matching capacitance values are calculated and the frequency characteristics of the system is tested using Electronic Workbench 5.1. The quality factor value of the tested system is found to be 162.5, which corresponds to a bandwidth of 39,2 KHz at 6,387 MHz (operating frequency of METU MRI system). The techniques suggested in this study can be used in order to design and realize RF coils on prede¯
ned arbitrary surfaces for inhomogeneous main magnetic fields. In addition, a hand held MRI device can be manufactured which uses a low cost permanent magnet to provide a magnetic field and generates the required RF field with the designed RF coil using the techniques suggested in this study.
GHAZARIAN, DANIEL. "Estimating the energy consumption of steering assist systems in commercial hybrid electric vehicles : A basis for utilization strategies." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299354.
Full textLastbils -och busstillverkaren Scania CV AB har nyligen introducerat ett system vid namnet Redundant Brake Steering (RBS) för elektrifierade fordon. Det primära styrsystemet i dessa fordon består av ett elektro-hydraliskt system (EHS) samt ett elektriskt aktivt styrsystem (EAS). Bakgrunden till att introducera RBS har varit grundat i att kunna implementera EAS som sekundärt styrsystem för att tillfredställa nuvarande lagkrav. Utfallet har blivit att det sekundära hydrauliska styrsystemet har kunnat ersättas med bromsstyrningssystem (RBS) samt EAS. Den grundläggande ambitionen för denna studie har varit at utforska ifall det nya bromsstyrningssystemet kan bidra till minskad energiförbrukning av fordonets styrsystem. Denna studie har bland annat innefattat en litteraturstudie av styrsystem, koncept som berör bromsstyrning samt tillgänglig fordonsdata för att kunna utveckla beräkningsmetoder av energiförbrukning av respektive system. Metoderna användes för att utveckla en beräkningsmodell i mjukvaran Matlab som med hjälp av fordonsdata kunde uppskatta energiförbrukningen av styrsystemen. Fordonstester utfördes i en fallstudie för att kunna samla in mätningar av fordonsdata. Detta gjordes med hjälp av ett plug-in hybrid fordon (PHEV) på Scania’s provbana i Södertälje, Sverige. Resultaten indikerade att en kombination av EAS och RBS har potential att bistå som primärt styrsystem sett till energiförbrukningen vilken kunde reduceras med upp till 90.6%. Vidare visade resultaten att påfrestningen på fordonets elektriska system kunde minskas, dock med nackdelen att förarens ansträngning ökar.
Martinez, Parrondo Yago. "Smart Meters : Basic Elements in the Development of Smart Grids." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13630.
Full textHwang, Sung Jun. "Communication over Doubly Selective Channels: Efficient Equalization and Max-Diversity Precoding." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1261506237.
Full textShi, Bowen. "High performance permanent magnet electrical machine for electrical vehicle applications." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52331/.
Full textBandreddy, Neel Kamal. "Estimation of Unmeasured Radon Concentrations in Ohio Using Quantile Regression Forest." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418311498.
Full textChien, Yu-Chien. "Electrical Aspects of Impinging Flames." Thesis, University of California, Irvine, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3682710.
Full textThis dissertation examines the use of electric fields as one mechanism for controlling combustion as flames are partially extinguished when impinging on nearby surfaces. Electrical aspects of flames, specifically, the production of chemi-ions in hydrocarbon flames and the use of convective flows driven by these ions, have been investigated in a wide range of applications in prior work but despite this fairly comprehensive effort to study electrical aspects of combustion, relatively little research has focused on electrical phenomena near flame extinguishment, nor for flames near impingement surfaces. Electrical impinging flames have complex properties under global influences of ion-driven winds and flow field disturbances from the impingement surface. Challenges of measurements when an electric field is applied in the system have limited an understanding of changes to the flame behavior and species concentrations caused by the field. This research initially characterizes the ability of high voltage power supplies to respond on sufficiently short time scales to permit real time electrical flame actuation. The study then characterizes the influence of an electric field on the impinging flame shape, ion current and flow field of the thermal plume associated with the flame. The more significant further examinations can be separated into two parts: 1) the potential for using electric fields to control the release of carbon monoxide (CO) from surface-impinging flames, and 2) an investigation of controlling electrically the heat transfer to a plate on which the flame impinges. Carbon monoxide (CO) results from the incomplete oxidation of hydrocarbon fuels and, while CO can be desirable in some syngas processes, it is usually a dangerous emission from forest fires, gas heaters, gas stoves, or furnaces where insufficient oxygen in the core reaction does not fully oxidize the fuel to carbon dioxide and water. Determining how carbon monoxide is released and how heat transfer from the flame to the plate can be controlled using the electric field are the two main goals of this research. Multiple diagnostic techniques are employed such as OH chemiluminescence to identify the reaction zone, OH PLIF to characterize the location of this radical species, CO released from the flame, IR imaging and OH PLIF thermometry to understand the surface and gas temperature distribution, respectively. The principal finding is that carbon monoxide release from an impinging diffusion flame results from the escape of carbon monoxide created on the fuel side of the flame along the boundary layer near the surface where it avoids oxidation by OH, which sits to the air side of the reaction sheet interface. In addition, the plate proximity to the flame has a stronger influence on the emission of toxic carbon monoxide than does the electric field strength. There is, however, a narrow region of burner to surface distance where the electric field is most effective. The results also show that heat transfer can be spatially concentrated effectively using an electric field driven ion wind, particularly at some burner to surface distances.
Carnes, Mark T. "Conceptual understanding of threshold concepts of electrical phenomena| Mental models of senior undergraduates in electrical engineering." Thesis, Purdue University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10244516.
Full textEvery field of study has a set of domain-specific concepts that anyone who desires to work in that field must know and understand. Most students who pursue university degrees in engineering trust that their education is designed to provide them with this knowledge. But does it? In electrical engineering (EE), conceptual understanding of electrical phenomena has rarely been addressed. Even though the presumed goal of instructors and students alike is to learn the concepts of electrical phenomena well enough to be able to use the concepts to design useful things, it is difficult to determine whether this goal is being achieved. The purpose of this study was to develop reasonable representations of the mental models used by senior EE students as they thought about and worked with electrical phenomena. Focusing on students’ mental models of threshold concepts in electrical phenomena can thus increase knowledge of students’ conceptual understanding, which can contribute to systematic research into pedagogical and assessment methods in this area of study, which forms one of the most basic and fundamental areas of knowledge needed by EE students.
Thus, the research question addressed by this study was:
What do senior EE students’ mental models of the fundamental electrical phenomena of voltage, current, and the relationship between them look like?
The theory of mental models claims that everyone organizes their understanding of the way the world works by constructing models in the mind by which they both explain phenomena that they observe, and make predictions about what is likely to occur in a given situation.
To observe the students’ mental models in operation, semi-structured interviews were used to engage the participants in a conversation concerning their knowledge and experience in applying electrical ideas. Using discourse analysis, a representation of each student’s mental model was created, consisting of a concept map and a short narrative. While the models were all different, analysis of them as a group led to the emergence of five dominant themes, or ways of thinking.
The findings of this study have implications for the course of study that these students are engaged in. How effective has it been in developing the conceptual understanding that they will need after they graduate? Knowledge of the outcomes of a course of study: the conceptual understanding of these students, the misconceptions present in their models, and the dominant themes that drive their models, can inform ongoing efforts in curriculum development.
Chauhan, Shweta. "Hysteretic controlled DC-DC converters." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1418308376.
Full textTandon, Nina. "Biomimetic electrical stimulation for cardiac tissue engineering." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38323.
Full textIncludes bibliographical references (leaves 66-69).
A major challenge of tissue engineering is directing cells to establish the physiological structure and function of the tissue being replaced. Electrical stimulation has been used to induce synchronous contractions of cultured cardiac constructs. The hypothesis adopted for this study is that functional cardiac constructs can be engineered by "mimicking" the conditions present during cardiac development, and in particular, electrical stimulation using supra-threshold signals. For this Master's Thesis research, I have compared the material properties and charge-transfer characteristics at the electrode-electrolyte interface of various biocompatible materials, including carbon, stainless steel, titanium and titanium nitride, for use as electrodes in a biomimetic system for cardiac tissue engineering. I have also designed and implemented an electrical stimulator which is capable of modulating several important parameters of electrical stimulation, including stimulus amplitude and frequency.
(cont.) In addition, I have built an experimental setup incorporating this electrical stimulator and used it for experiments with C2C12 mouse myoblast cells and neonatal rat cardiomyocytes. Lastly, I have analyzed cell morphology as well as functional performance of engineered tissue by assessing excitation thresholds and maximum capture rates.
by Nina Tandon.
S.M.
Uudelepp, Oscar, Ellen Nordén, and Douglas Lowén. "Electric Bike : Independent Project in Electrical Engineering." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353617.
Full textBjörklund, Marcus, and Eric Fjärstedt. "Active Stabilizer : Independent Project in Electrical Engineering." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324765.
Full textKhrapach, Ivan. "Engineering the electrical properties of graphene materials." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/8168.
Full text