Dissertations / Theses: 'Electronic systems'

1

Geer, Steven Jon. "Electronic properties of bilayer low-dimensional electron systems." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619774.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Zolleis, Kai Rudiger. "Electronic properties of parallel low-dimensional electron systems." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624494.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Ødegård, Rune Steinsmo. "Electronic voting systems." Thesis, Norwegian University of Science and Technology, Department of Mathematical Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9499.

Full text

Abstract:

We present the cryptographic primitives needed in the construction of electronic voting systems based on homomorphic encryptions and on verifiable secret sharing. Then "The theory and implementation of an electronic voting system" by Ivan Damgård, Jens Groth and Gorm Salomonsen is presented as an example of electronic voting systems based on homomorphic encryptions, while "Multi-authority secret-ballot election with linear work" by Ronald Cramer, Matthew Franklin, Berry Schoenmakers and Moti Yung is presented as an example of electronic voting systems based on verifiable secret sharing. Moreover, the mathematical background for these systems are studied with particular emphasis on the security issues of the relevant sub-protocols. Comparing these two examples we find that the presented voting system based on verifiable secret sharing is more secure then the one based on homomorphic encryptions, both in regard to privacy and robustness. On the other hand, we find that the presented voting system based on homomorphic encryptions is more efficient then the one based on verifiable secret sharing.

APA, Harvard, Vancouver, ISO, and other styles

4

SALEH, MOUSTFA. "Embedded Electronic Systems for Electronic Skin Applications." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1039846.

Full text

Abstract:

The advances in sensor devices are potentially providing new solutions to many applications including prosthetics and robotics. Endowing upper limb prosthesis with tactile sensors (electronic/sensitive skin) can be used to provide tactile sensory feedback to the amputees. In this regard, the prosthetic device is meant to be equipped with tactile sensing system allowing the user limb to receive tactile feedback about objects and contact surfaces. Thus, embedding tactile sensing system is required for wearable sensors that should cover wide areas of the prosthetics. However, embedding sensing system involves set of challenges in terms of power consumption, data processing, real-time response and design scalability (e-skin may include large number of tactile sensors). The tactile sensing system is constituted of: (i) a tactile sensor array, (ii) an interface electronic circuit, (iii) an embedded processing unit, and (iv) a communication interface to transmit tactile data. The objective of the thesis is to develop an efficient embedded tactile sensing system targeting e-skin application (e.g. prosthetic) by: 1) developing a low power and miniaturized interface electronics circuit, operating in real-time; 2) proposing an efficient algorithm for embedded tactile data processing, affecting the system time latency and power consumption; 3) implementing an efficient communication channel/interface, suitable for large amount of data generated from large number of sensors. Most of the interface electronics for tactile sensing system proposed in the literature are composed of signal conditioning and commercial data acquisition devices (i.e. DAQ). However, these devices are bulky (PC-based) and thus not suitable for portable prosthetics from the size, power consumption and scalability point of view. Regarding the tactile data processing, some works have exploited machine learning methods for extracting meaningful information from tactile data. However, embedding these algorithms poses some challenges because of 1) the high amount of data to be processed significantly affecting the real time functionality, and 2) the complex processing tasks imposing burden in terms of power consumption. On the other hand, the literature shows lack in studies addressing data transfer in tactile sensing system. Thus, dealing with large number of sensors will pose challenges on the communication bandwidth and reliability. Therefore, this thesis exploits three approaches: 1) Developing a low power and miniaturized Interface Electronics (IE), capable of interfacing and acquiring signals from large number of tactile sensors in real-time. We developed a portable IE system based on a low power arm microcontroller and a DDC232 A/D converter, that handles an array of 32 tactile sensors. Upon touch applied to the sensors, the IE acquires and pre-process the sensor signals at low power consumption achieving a battery lifetime of about 22 hours. Then we assessed the functionality of the IE by carrying out Electrical and electromechanical characterization experiments to monitor the response of the interface electronics with PVDF-based piezoelectric sensors. The results of electrical and electromechanical tests validate the correct functionality of the proposed system. In addition, we implemented filtering methods on the IE that reduced the effect of noise in the system. Furthermore, we evaluated our proposed IE by integrating it in tactile sensory feedback system, showing effective deliver of tactile data to the user. The proposed system overcomes similar state of art solutions dealing with higher number of input channels and maintaining real time functionality. 2) Optimizing and implementing a tensorial-based machine learning algorithm for touch modality classification on embedded Zynq System-on-chip (SoC). The algorithm is based on Support Vector Machine classifier to discriminate between three input touch modality classes “brushing”, “rolling” and “sliding”. We introduced an efficient algorithm minimizing the hardware implementation complexity in terms of number of operations and memory storage which directly affect time latency and power consumption. With respect to the original algorithm, the proposed approach – implemented on Zynq SoC – achieved reduction in the number of operations per inference from 545 M-ops to 18 M-ops and the memory storage from 52.2 KB to 1.7 KB. Moreover, the proposed method speeds up the inference time by a factor of 43× at a cost of only 2% loss in accuracy, enabling the algorithm to run on embedded processing unit and to extract tactile information in real-time. 3) Implementing a robust and efficient data transfer channel to transfer aggregated data at high transmission data rate and low power consumption. In this approach, we proposed and demonstrated a tactile sensory feedback system based on an optical communication link for prosthetic applications. The optical link features a low power and wide transmission bandwidth, which makes the feedback system suitable for large number of tactile sensors. The low power transmission is due to the employed UWB-based optical modulation. We implemented a system prototype, consisting of digital transmitter and receiver boards and acquisition circuits to interface 32 piezoelectric sensors. Then we evaluated the system performance by measuring, processing and transmitting data of the 32 piezoelectric sensors at 100 Mbps data rate through the optical link, at 50 pJ/bit communication energy consumption. Experimental results have validated the functionality and demonstrated the real time operation of the proposed sensory feedback system.

APA, Harvard, Vancouver, ISO, and other styles

5

Foley, Simon Timothy. "Effects of electron-electron interactions on electronic transport in disordered systems." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273932.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Bingley, R. M. "Electronic theodolite intersection systems." Thesis, University of Nottingham, 1990. http://eprints.nottingham.ac.uk/14248/.

Full text

Abstract:

The development of electronic surveying instruments, such as electronic theodolites, and concurrent advances in computer technology, has revolutionised engineering surveying; one of the more recent examples being the introduction of Electronic Theodolite Intersection Systems (ETISs). An ETIS consists of two or more electronic theodolites and a computer, with peripheral hardware and suitable software. The theoretical principles on which they are based have been known for a long time, but intersection has seldom been used as a method of measurement. The main reasons for its re-evaluation were the introduction of one-second electronic theodolites and the ability to interface these on-line to a computer. The last decade has seen the development of several commercially available systems and probably even more in-house developed systems. Such systems are capable of performing real-time, non-contact, three-dimensional coordinate determination to a high accuracy, enabling their use in a wide variety of applications. This thesis details all aspects of ETISs. Initially, the theoretical principles on which the systems are based are developed. The components of a system are then detailed and a review of current commercially available systems and their applications is given. The thesis then concentrates on the development of an ETIS by the author and details its' application in both industrial measurement and deformation monitoring. Finally, the thesis concludes with a discussion on the factors affecting the accuracies attainable with ETISs.

APA, Harvard, Vancouver, ISO, and other styles

7

Webb, Paul. "Electronic odour sensing systems." Thesis, University of Warwick, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332850.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Arraiz, Jose-Ignacio. "Electronic performance measurement systems : feasibility of electronic performance measurement systems : a case study." Thesis, Nottingham Trent University, 2017. http://irep.ntu.ac.uk/id/eprint/34038/.

Full text

Abstract:

This thesis explores the possibility of using digital technologies to improve and redefine the performance management process of employees within organisations. A review of the literature indicates that performance processes are not working; a key finding in the literature is the difficulty in collecting the right evidence in order to have the relevant conversation between manager and employee: that is, having access to enough data in order to run the performance measurement. A case study is used to explore two different perspectives: a technical one, looking for accuracy in the performance appraisal, and a social one, for acceptance of the results among the different stakeholders. The main findings of the research are as follows: • Technically, it is possible to gather data about how employees perform at work and develop an algorithm that predicts individual performance, that is: know-how compared with the job profile; behaviours compared with the company values; and output compared with the budget or business plan. • The use of technology to support performance measurement – which is very limited currently – is likely to increase dramatically. With predictive models, performance can be measured, and data be collected at any time. • Like any other new technology, the success of an electronic performance appraisal system depends on the determinants of adoption. These, being complex depend largely upon the different stakeholders, CEO (or eventually the Board), line managers and employees. Each has different interests, perceptions, wills and fears. • In the case study analysed, all stakeholders accepted the concept idea intellectually, an electronic system capable of capturing information and predicting performance at an individual level. However a common fear among line managers is that they will lose control over even basic decisions (i.e. promotion, salary review or bonuses for the consultants). This implies a significant loss of managerial power. • The performance process in most organisations has four different stages: planning, assessment, recognition and career planning. These are usually framed into the budget cycle. • The introduction of technology opens up a new perspective. The measurement phase can be run by the system, in its entirely virtually, and be run at any time. Managers could run performance appraisals and interviews at any time over the year, probably interviewing staff focused on specific issues more; likewise employees may receive feedback more often; the process is disconnected from the recognition phase. The discussion between line manager and employee looks forward rather than backward and focuses on action plans. The research gives practitioners the opportunity to rethink the performance management process, and shows that it is possible to reframe it thanks to technology. As a case study, however, there are still many limitations when generalizing the process.

APA, Harvard, Vancouver, ISO, and other styles

9

Metalidis, Georgo. "Electronic transport in mesoscopic systems." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985476753.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Banerji, Ashok Kumar. "Designing electronic performance support systems." Thesis, Teesside University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239942.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Moore, Adrian Albert. "Design of electronic painting systems." Thesis, University of Ulster, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333658.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Esteban, Puyuelo Raquel. "Electronic Properties of Correlated Systems." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-287985.

Full text

Abstract:

The aim of this project is to become familiar with the Hubbard-corrected energy functionals used in density functional theory, which are needed to describe the electronic properties of strongly correlated systems. This study focuses on two systems, gadolinium and nickel oxide, as examples of a lanthanide and a transition metal oxide, respectively, for which the conventional approaches to Density Functional Theory such as Local Density Approximationor Generalized Gradient Approximation fail.

APA, Harvard, Vancouver, ISO, and other styles

13

Banerji, (Bandyopadhyay) Ashok Kumar. "Designing electronic performance support systems." Boston Spa, United Kindom : British Library Document Supply Centre, 1995. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.239942.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Souza, Aldilene Saraiva. "Electronic Transport in Molecular Systems." reponame:Repositório Institucional da UFC, 2012. http://www.repositorio.ufc.br/handle/riufc/12671.

Full text

Abstract:

SOUZA, Aldilene Saraiva. Electronic Transport in Molecular Systems. 2012. 107 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2012.
Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-06-08T19:17:13Z No. of bitstreams: 1 2012_tese_assouza.pdf: 11520100 bytes, checksum: 04bcbbf301130ab097bf5c01340034df (MD5)
Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-06-08T19:52:21Z (GMT) No. of bitstreams: 1 2012_tese_assouza.pdf: 11520100 bytes, checksum: 04bcbbf301130ab097bf5c01340034df (MD5)
Made available in DSpace on 2015-06-08T19:52:21Z (GMT). No. of bitstreams: 1 2012_tese_assouza.pdf: 11520100 bytes, checksum: 04bcbbf301130ab097bf5c01340034df (MD5) Previous issue date: 2012
Nesta tese apresentamos o estudo teórico de transporte eletrônico de dispositivos moleculares em dois problemas distintos. No primeiro, comparamos medidas via microscopia de tunelamento (STM) com cálculos de primeiros princípios onde a tensão aplicada em uma mono camada de moléculas auto-montadas, denominadas: 5-(4-piridina)-1,3,4-oxadiazol-2-tiol (HPYT) e 5-(4-fenil)-1,3,4-oxadiazol-2-tiol (HPOT) mostram a distribuição local de carga. Essas moléculas são depositadas sobre um substrato de ouro tipo (1 1 1). A formação destas camadas moleculares foi confirmada por medidas de STM. Cálculos baseados na teoria do funcional da densidade (DFT) foram realizados para obter a conformação mais estável da interação molécula/substrato. Verificamos uma grande semelhança entre os resultados teóricos e as medidas de imagem de STM. A partir desta comparação, sugerimos que o átomo de enxofre na molécula HPYT e HPOT está ligado à superfície de ouro por uma ligação direta à um único átomo de ouro. Para descrever a corrente de tunelamento ao longo da mono camada molecular sobre a superfície de Au (1 1 1) foi proposto um modelo quântico baseado na técnica de equação mestra. Nós investigamos também, propriedades de transporte de spin em uma cadeia de poliacetileno (como ponte) acoplada à uma nano fita de carbono tipo zigue-zague (ZGNRs) funcionando como eletrodos. Os cálculos de transporte foram efetuados usando técnica de funções de Green fora do equilíbrio (NEGF), combinada com a teoria do funcional da densidade (DFT). Trabalhos anteriores demonstraram que as ZGNRs exibem um ordenamento antiferromagnético (AF) e meia-metalicidade nos estados provenientes da borda, que podem ser destruídos com aplicação de um forte campo elétrico externo. Neste trabalho, nós demonstramos que a ligação entre a ponte molecular e átomos não-equivalentes de carbono (A/B) na sub rede de grafeno ZGNRs pode ocorrer de duas formas produzindo um sistema metálico ou semicondutor fortemente dependente do acoplamento local. Ao considerar o anel de carbono onde a cadeia está ligada, uma ligação se assemelha a uma ligação para no benzeno, enquanto a outra ligação é semelhante a uma ligação meta. Estas geometrias geram transmissão eletrônica distinta, que pode ser controlada sob um campo elétrico transversal.

APA, Harvard, Vancouver, ISO, and other styles

15

Brunelli, Davide <1977&gt. "Electronic systems for ambient intelligence." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/388/1/Brunelli_Davide_Tesi_dottorato_ing-inf01.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Brunelli, Davide <1977&gt. "Electronic systems for ambient intelligence." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/388/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Rowe, Arthur T. "An analysis of electronic commerce acquisition systems : comparison of a new pure electronic purchasing and exchange system (electronic storefront) and other legacy on-line purchasing systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FRowe.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

SAMAR, EL HELOU. "Evolutionary Design of Electronic Medical Record Systems." Kyoto University, 2019. http://hdl.handle.net/2433/244578.

Full text

Abstract:

付記する学位プログラム名: デザイン学大学院連携プログラム
Kyoto University (京都大学)
0048
新制・課程博士
博士(情報学)
甲第22097号
情博第707号
新制||情||121(附属図書館)
京都大学大学院情報学研究科社会情報学専攻
(主査)教授黒田知宏, 教授吉川正俊, 教授矢守克也
学位規則第4条第1項該当

APA, Harvard, Vancouver, ISO, and other styles

19

Liu, Kung-Chao. "Information system development and the use of electronic meeting systems." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185439.

Full text

Abstract:

Information system requirements determination is a key area in management information systems research that includes the problems of requirements specification, requirements elicitation, and user involvement. The combination of these three problems is a research area which we call the group approach to information system requirements determination. The main contribution of this research is a model to be used for the problem of fitting existing computer aids to this research area and a set of methods for solving the usability and configuration problems when using such computer aids. The usability problem is that of determining whether a set of computer aids can be used effectively in accomplishing the task of requirements determination. The configuration problem is that of selecting a minimum collection of funtionalities necessary for economically supporting all aspects of requirements determination. Electronic meeting systems are the general category of computer aids that we are interested in applying to the task. In particular, the GroupSystems electronic meeting system developed at The University of Arizona is used as a case in this research. Characteristics of the requirements determination task and profiles of GroupSystems tools are combined into our model for fitting computer aids to a given task. We then derive the answers regarding the usability and configuration of GroupSystems in the group approach to information system requirements determination. We also compare the derived configurations to the GroupSystems tools used in an authentic case. The main points of this research include: (1) proposal of the concept of fitting computer aids to, instead of developing new computer aids for, a task area; (2) proposal of a model for fitting computer aids via a classification of information types; (3) analysis of the natures of the fitting model and the usability and configuration problems; (4) proposal of approximation methods for solving the configuration problem; (5) analysis of the task area--the group approach to information system requirements determination; (6) analysis of the use of GroupSystems in the task area by applying the proposed fitting model and approximation methods; and (7) demonstration of the usefulness of the fitting model and approximation methods by analyzing an authentic case of using GroupSystems tools.

APA, Harvard, Vancouver, ISO, and other styles

20

Quezada, Gomez Juan Manuel. "Model-based guidelines for automotive electronic systems software development." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100383.

Full text

Abstract:

Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 96-98).
The automobile innovation transformed the human life style ever since its introduction to the public, and for over the last one hundred years incumbent technologies have been adopted to improve its performance characteristics. Yet, we need a holistic approach to understand that automobiles shifted from being a mere assembly of mechanical parts to a multidisciplinary system that form the modern automobile. Thanks to the increased use of electronics and software in automobiles, consumers benefit from better gas mileage, more amenities and features, such as comfort, driving assistance, and entertainment. At the same time, stability and performance of automobiles as systems have been facing deterioration, and eventually vehicle owners are finding that features and functions become inoperative over time, causing frustration, loss of time and money. Reports of problems experienced by vehicle owners have stem from casual factors of system defects that model-based systems engineering can reduce or eliminate. This research presents a model-based systems engineering approach to an automobile electronic system design. The work is founded on a comprehensive OPM model and engineering guidelines for electronic control module software design. The purpose of the framework developed in this study is to support development of complex vehicle software that allows flexibility for changing features and creating new ones, and enables software developers to pinpoint systemic faults quicker and at earlier lifecycle phases, reducing rework, increasing safety, and providing for more effective resolution of such problems.
by Juan Manuel Quezada Gomez.
S.M. in Engineering and Management

APA, Harvard, Vancouver, ISO, and other styles

21

Yang, Jun Carleton University Dissertation Geography. "TMDS thematic map design advisory system; for geographical information systems and electronic mapping systems." Ottawa, 1993.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

22

Ma, Yuefei. "Analysis of programmable molecular electronic systems." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5997.

Full text

Abstract:

The continuing scaling down in size of microelectronics devices has motivated the development of molecular electronic devices, often called moletronics, which use molecules to function as electronic devices. One of the moletronics is the programmable molecular array. In this device, disordered arrays of metallic islands are interlinked by molecules. It is addressed by a small number of input/output leads located on the periphery of the device. In this dissertation, a thorough investigation of the programmable molecular array is performed. First, theoretical calculations for single molecules are carried out. The effect of bias voltage on the electron transmission through the molecule is reported. Next, electrical measurements are conducted on programmable molecular arrays. Negative differential resistance and memory phenomena are found. The electrical characteristics of the programmable molecular array populated with different molecules indicate that the metallic islands contribute to the above phenomena. The electrical conductance through the metallic islands is investigated, and conformational change of the metallic islands under bias is reported. Furthermore, a scenario is proposed to use molecular vibronics and electrostatic potential to transport and process signals inside the programmable molecular array. Simulated results are presented.

APA, Harvard, Vancouver, ISO, and other styles

23

Enohnyaket, Mathias. "Electromagnetic characterization of power electronic systems." Doctoral thesis, Luleå tekniska universitet, EISLAB, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17800.

Full text

Abstract:

Propelled by increased global awareness and demand for clean energy systems, there is a growing trend in transportation, utility, industrial, and residential applications towards the utilisation of power electronic systems with enhanced power ow controllability and eciency. Examples of power electronics applications include terminal converters in high-voltage direct Current (HVDC) transmission; exible AC transmission systems (FACTS); and converters to interface alternative energy systems such as wind turbines to the grid, variable-speed motor drives in pump systems, vehicular propulsion systems, air-conditioners, and refrigerators.The basic functionality of power electronic components is achieved by switching high voltages and currents. Recent advancements in semiconductor technology have significantly improved the current and voltage handling capabilities and the switching frequencies of power electronic devices. However, this rapid switching of high currents and voltages in turn generates electromagnetic disturbances that could distort the functionality of the power electronic equipment and other devices in the vicinity. Electromagnetic compatibility (EMC) regulations and functionality requirements impose restrictions on the design of power electronic systems. To design robust power electronic systems, a thorough understanding of the related electromagnetic issues is required.This thesis focuses on the EMC characterisation of power electronic systems and contains two major phases.In the first phase, the high frequency characterisation of air-core reactors was considered. Air-core reactors are typically used in power systems for current limiting, ltering, shunting, and neutral grounding applications. It is of interest to understand the behaviour of air-core reactors in the presence of high frequency signals, especially from switching operations in the power electronic components. Using the partial element equivalent circuit (PEEC) approach, air-core reactor models, helpful in design and electromagnetic analysis, were created. The PEEC models were able to predict the current and voltage distributions and the eventual electromagnetic emissions at different frequencies. The second phase involved the characterisation of electromagnetic emissions from PWM drives using both modeling and measurement. A case study was performed on a prototype hybrid electric vehicle (HEV). Typically, emissions from PWM drives are expected at harmonics of the PWM switching frequency (fc) and harmonics of the fundamental frequency (f0) of the phase voltages. In this study, it was established that space vector PWM drives generate low-frequency pulsating (LFP) emissions at a frequency of 6f0. The switching of voltage vectors generates common mode current spikes because of the presence of stray capacitances and inductances. The spikes superpose across sector boundaries, forming spikes of double or triple amplitude that constitute the LFP emissions. The amplitudes of these ulsations were shown to be dependent on the drive parameters, such as the load, the speed, and the voltage slew rates. These common mode emissions enhance the emissions at harmonics of the switching frequency, create low-frequency emissions, and when injected into an electric motor, could cause torque pulsations and speed uctuations that may degrade drive functionality. Measurements from an HEV prototype show the LFP emissions, and theoretical models were developed to characterise them.

Godkänd; 2010; 20100826 (mathen); DISPUTATION Ämnesområde: Industriell elektronik/Industrial Electronics Opponent: Professor Mats Alaküla, Lund University and Volvo Car AB Ordförande: Professor Jerker Delsing, Luleå tekniska universitet Tid: Torsdag den 30 september 2010, kl 09.30 Plats: A1514 Demostudion, Luleå tekniska universitet

EM Karaktärisering och Modellering av Elektriska Hybriddrivsystem

APA, Harvard, Vancouver, ISO, and other styles

24

Anderson, Grant D. W. "Electronic structure calculations of organometallic systems." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398170.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Pan, Fei. "Multifrequency Averaging in Power Electronic Systems." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/62.

Full text

Abstract:

Power electronic systems have been widely used in the electrical power processing for applications with power levels ranging from less than one watt in battery-operated portable devices to more than megawatts in the converters, inverters and rectifiers of the utility power systems. These systems typically involve the passive elements such as inductors, capacitors, and resistors, the switching electronic components such as IGBTs, MOSFETS, and diodes, and other electronic circuits. Multifrequency averaging is one of the widely used modeling and simulation techniques today for the analysis and design of power electronic systems. This technique is capable of providing the average behavior as well as the ripple behavior of power electronic systems. This work begins with the extension of multifrequency averaging to represent uniformly sampled PWM converters. A new multifrequency averaging method of solving an observed issue with model stability is proposed and validated. Multifrequency averaging can also be applied to study the instability phenomenon in power electronic systems. In particular, a reduced-order multifrequency averaging method, along with a genetic algorithm based procedure, is proposed in this work to estimate the regions of attraction of power electronic converters. The performance of this method is shown by comparing the accuracy and efficiency with the existing methods. Finally, a new continuous-time multifrequency averaging method of representing discrete-time systems is proposed. The proposed method is applied to model digitally controlled PWM converters. Simulation and hardware results show that the proposed method is capable of predicting the average behavior as well as the ripple behavior of the closed-loop systems. Future research in the area of multifrequency averaging is proposed.

APA, Harvard, Vancouver, ISO, and other styles

26

McWilliam, Richard. "Electronic identification systems for asset management." Thesis, Durham University, 2003. http://etheses.dur.ac.uk/3697/.

Full text

Abstract:

Electronic identification is an increasingly pervasive technology that permits rapid data recovery from low-power transponders whenever they are placed within the vicinity of an interrogator device. Fundamental benefits include proximity detection not requiring line-of-sight, multiple transponder access and data security. In this document, electronic identification methods for asset management are devised for the new target application of electrical appliance testing. In this application mains-powered apparatus are periodically subjected a prescribed series of electrical tests performed by a Portable Appliance Tester (PAT). The intention is to enhance the process of appliance identification and management, and to automate the test process as far as possible. Three principal methods of electronic identification were designed and analysed for this application: proximity Radio Frequency Identification (RFID), cable RFID and power- line signalling. Each method relies on an inductively coupled mechanism that utilities a signalling technique called direct-load modulation. This is particularly suited to low- cost passive transponder designs. Physical limitations to proximity RFID are identified including coil size, orientation and susceptibility to nearby conducting surfaces. A novel inductive signalling method called cable RFID is then described that permits automatic appliance identification. This method uses the appliance power cable and inlet filter to establish a communication channel between interrogator and transponder. Prior to commencing the test phase, an appliance is plugged into the PAT and identified automatically via cable RFID. An attempt is made to extend the scope of cable RFID by developing a novel mains power-line signalling method that uses direct-load modulation and passive transponders. Finally, two different implementations of RFID interrogator are described. The first takes the form of an embeddable module intended for incorporation into electronic identification products such as RFID enabled PAT units. Software Defined Radio (SDR) principles are applied to the second interrogator design in an effort to render the device reconfigurable.

APA, Harvard, Vancouver, ISO, and other styles

27

APEL, VICTOR MARCELO. "ELECTRONIC CORRELATION IN QUANTUM DOTS SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=6583@1.

Full text

Abstract:

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Nesta tese investigamos os efeitos das interações elétron- elétron nas propriedades de transporte nanosistemas. Em particular, estudamos sistemas constituídos por dois pontos quânticos conectados a dois contatos, em diferentes topologias. O principal interesse é estudar os efeitos do regime Kondo e da fase eletrônica na condutância. Na configuração onde os dois pontos são inseridos em cada braço de um anel atravessado por um fluxo magnético, denotada por PPL, calculamos as fases das correntes que circulam através de cada braço do anel. Estas fases são determinadas pelo efeito Aharonov-Bohm combinado com a inflência da interação de muitos corpos das cargas nos pontos. Este sistema apresenta ressonância Kondo para um número par de elétrons em concordância com os resultados experimentais1. Outro aspecto interessante da configuração PPL é que, mesmo na ausência de fluxo magnético, pode existir circulação de corrente no anel, dependendo dos parâmetros escolhidos. Consideramos outras duas topologias que envolvem dois pontos quânticos acoplados através de interação de tunelamento. Em uma delas, denotada PAL, os dois pontos estão alinhados com os contatos, e na outra, a configuração PPD, um ponto está inserido nos contatos entanto que o outro interage só com o primeiro. No limite de acoplamento fraco, estas duas configurações apresentam características bem distintas, no só na dependência da condutância com o potencial de porta mas também na correlação de spin dos pontos quânticos. Ambas configurações apresentam ressonância Kondo para um número par de elétrons de diferente natureza. Quando cada ponto está carregado com um elétron, no caso da configuração PAL, os spins dos pontos quânticos estão descorrelacionados enquanto que, na configuração PPD, os spins estão correlacionados ferromagneticamente. No limite do acoplamento forte as propriedades de transporte das dois configurações são similares. Os sistemas discutidos acima são representados por o Hamiltoniano de Anderson de duas impurezas acopladas, o qual é resolvido diagonalizando exatamente um aglomerado que é embebido no resto do sistema. Desta forma obtemos as propriedades de transporte a T = 0. Para estudar a dependência com a temperatura utilizamos o método da equação de movimento (EOM) no limite da repulsão Coulombiana infinita. Aplicamos este método ao caso da topologia PPD, obteniendo resultados para baixas temperaturas consistente com os obtidos com o método do aglomerado.
In this thesis we investigate the effects of the eletron- eletron interaction on the transport properties of nanosystems. In particular, we study systems constituted by two quantum dots conected to leads, in different topologies. Our main interest is to study the effects of the Kondo regime and the electronic phase on the conductance. In the configuration where the two dots are inserted in each arm of a ring threaded by a magnetic flux, denoted by PPL, we calculate the phases of the currents going along each arm of the ring. These phases are determined by the Aharonov-Bohm effect combined with the dots many body charging effects. This system presents the Kondo phenomenon for an even number (two) of electrons in the dots, in agreement with experimental results1. An interesting aspect of PPL configuration is that, even in the absence of magnetic flux there can be a circulating current around the ring, depending on the system parameters. In the two other topologies we consider the two quantum dots coupled through tunneling interaction. In one of them, denoted by PAL, the two dots are aligned with the leads, and in the other, the PPD configuration, one dot is inserted into the leads while the other interacts only with the first. In the weak coupling limit these two configurations present quite different features, not only on the dependence of the conductance on the gate potencials applied to the dots, but also on the dots spin correlation. Both configurations present Kondo resonance for an even number electrons. In the PAL configuration the spins of the charged dots are uncorrelated, while in the PPD configuration they are ferromagnetically correlated. In the strong tunneling coupling limit the transport properties of two interacting dot configurations are very similar. The systems discussed above are represented by an Anderson two- impurity first-neighbor tight-binding Hamiltonian, that is solved by exactly diagonalizing a cluster that is embebed into the rest of the system. In this way we obtain only the properties of the system at T = 0. In order to study temperature dependence phenomena we use the equation of motion method (EOM) in the limit of infinite Coulomb repulsion. We apply it to the dots in the PPD topology. The results for low temperatures are consistent with hose obtained with the cluster method.

APA, Harvard, Vancouver, ISO, and other styles

28

DILLON, SARWAN SINGH. "ELECTRONIC GUIDE TO CONSTRUCTION INDEXING SYSTEMS." The University of Arizona, 1990. http://hdl.handle.net/10150/555282.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Searle, Graham Ellis. "Dynamic modelling of electronic nose systems." Thesis, University of Warwick, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251118.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Berthe, Maxime. "Electronic transport in quantum confined systems." Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-Berthe.pdf.

Full text

Abstract:

Depuis l'avènement des nanotechnologies, une grande quantité de matériaux sont façonnés à l'échelle du nanomètre par des techniques diverses et l'intégration de ces nanostructures demande une caractérisation de leur structure électronique. La microscopie à effet tunnel est adaptée à ces études car elle permet l'adressage de nanostructures uniques pour mesurer leur structure électronique. Nous rapportons ici l'étude du transport électronique dans deux types de nanostructures: des nanotubes de carbone simple paroi déposés sur une surface d'or et des atomes uniques de silicium sur un substrat de silicium. Dans la première étude, le couplage faible entre un nanotube et le substrat permet d'accéder à la densité d'états unidimensionnelle des nanotubes et autorise la formation de défauts ponctuels, ayant des états localisés dans la bande interdite des nanotubes. Cette modification, réversible, de la structure atomique des nanotubes de carbone amène des opportunités concernant la modification controlée et à volonté de leurs propriétés électroniques. La deuxième étude vise à caractériser la dynamique des porteurs dans une liaison pendante de silicium énergétiquement isolée de tout autre état électronique sur une surface Si(111). L'analyse du transport révèle un courant inélastique mettant en oeuvre la recombinaison non radiative des électrons de la pointe avec des trous capturés par l'état de la liaison pendante, grâce à l'émission de vibrations. La spectroscopie à effet tunnel montre de plus que l'on peut caractériser l'efficacité de capture d'un état quantique unique, en connaissant son niveau d'énergie, sa fonction d'onde, sa section de capture et le couplage électron-phonon.

APA, Harvard, Vancouver, ISO, and other styles

31

El-Nakla, Samir. "Intelligent electronic design for mechatronic systems." Thesis, Abertay University, 2004. https://rke.abertay.ac.uk/en/studentTheses/f767c64f-e5c8-40f5-aa3f-ac9186634a9c.

Full text

Abstract:

Mechatronics requires the integration of a range of technologies from mechanical engineering, electronics and software, often with conflicting requirements. This problem is particularly complex with respect to the electronic parts of a mechatronics system where there are currently no computer-based tools available to support and assist designers during the early stages of the design process. Recognising this, the thesis was initially defined and developed based on the decomposition of a mechatronic system into its different system components using Functional Decomposition and top down approach. This led to the development and implementation of a computer-based system at lower level and which is used to assist in the design of electronic systems, which themselves form a part of a larger or mechatronic system. Filter design was chosen as an exemplar for the purpose of demonstrating the approach used, which will also enable and support the reflection of the strategy onto other electronic systems. The system can be developed to the point of providing an expert system that support users who are either experienced or inexperienced in filter design. It can also provide help, assistance and advice to the user. Filter design knowledge has been acquired from related experts and sources such as texts and represented and coded appropriately. A range of different filter designs are stored in a well-designed database that the design can be retrieved from when needed using strategy based on a combination of Case Based Reasoning and rules. The final part of the project is concerned with the definition of means by the methodology can be linked to other system domains to generate an overall design and to manage the transfer of information, including constraints and conflicts, between levels within the design process by means of a Data Dictionary. A major aim of the demonstrator tool in addition to providing help and support to users is to achieve timesavings and enhance the cost effectiveness of the design process. Also it can ease the communication between different technology-groupings in a mechatronic design team. What has been achieved is an increased understanding of the decomposition of the mechatronic system and of the interrelationships between the technical domains. At the lower levels the emphasis is on the electronic components of a mechatronic system, and of how the development of the chosen exemplar can be used as a basis from which the overall electronic system can be developed and linked to the mechatronic system.

APA, Harvard, Vancouver, ISO, and other styles

32

Lanka, Sivakumar. "Bandwidth efficient modulation techniques for lightwave systems." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3316383.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Ueda, Suguru. "Theoretical study on electronic properties at interfaces of strongly correlated electron systems." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199081.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Newell, Mark Alistair. "Physical and electronic structure of simple metal systems studied by electron spectroscopy." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333499.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Richards, David Robert. "The electronic structure and optical properties of GaAs two-dimensional electron systems." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359697.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Kurata, Ryohei. "Studies on Electronic Properties of Nitrogen-and Boron-Containing π-Electron Systems." Doctoral thesis, 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225623.

Full text

Abstract:

京都大学
0048
新制・課程博士
博士(工学)
甲第20398号
工博第4335号
新制||工||1672(附属図書館)
京都大学大学院工学研究科分子工学専攻
(主査)教授関修平, 教授今堀博, 准教授伊藤彰浩, 教授白川昌宏
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DGAM

APA, Harvard, Vancouver, ISO, and other styles

37

黃志明 and Chi-ming Simon Wong. "Electronic mail: technology, applications andinfrastructure." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B3126511X.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Fröberg, Joakim. "Engineering Automotive Electronic Systems: Decision Support for Successful Integration." Doctoral thesis, Mälardalen University, Department of Computer Science and Electronics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-459.

Full text

Abstract:

The electronic system of a modern vehicle is essential to achieve a successful automotive product. Vehicle development is performed by integrating components that include embedded electronics from several suppliers.

This thesis present results on the subject of integration of automotive electronic systems. Our studies aim at providing knowledge on how to integrate automotive electronic systems successfully in a setting where vehicles are developed based on existing platforms. We focus on early phases of automotive electronic system development and in particular on the decisions taken in integration of electronic sub-systems. The contribution is the presented support for making decisions to successfully integrate electronic systems for modern vehicles. The contribution includes an overview of driving factors of automotive electronics system design, a validated set of success practices for the integration of electronic components, and the proposal and demonstration of a decision model. The influential factors and the validated set of practices stems from case studies of products and projects while the proposed decision model is a result of combining two general models for architecture analysis and decision making, ATAM and AHP.

We demonstrate that choices in strategy and design preceding integration are central to achieve a successful integration. Our studies show that problems arise from omitted strategy decisions and we provide a checklist for decision making in the areas; functionality, platform, integration design, and assigning responsibilities. We provide a recommendation that we validate in a multiple cases study where fulfillment of recommendations is demonstrated to affect project success in integration projects.

The potential gain for OEMs using our results lies in achieving more solid foundations for design decisions. Designers and managers could potentially find central decisions on integration strategy early that, if omitted, could cause delays. Thus, applying the result could avoid pitfalls and enable successful integration projects.

APA, Harvard, Vancouver, ISO, and other styles

39

Janardhana, Swamy V. C. "Electronic Access Control Systems: A New Approach." Thesis, Indian Institute of Science, 1994. https://etd.iisc.ac.in/handle/2005/237.

Full text

Abstract:

Security systems are gaining increasing importance in recent times to protect life and valuable resources. Many advanced methods of providing security have been developed and are in use in the last few decades. Of these, one important area is the security system required for military/strategic applications, which has advanced greatly. But, such systems being complex and expensive are useful in high-end applications only. However, with the recent progress in technology and the growing need for increased security in civilian and other applications, many low cost solutions for security systems have now emerged. As a result, many applications where only a simple intruder alarm was the means of providing security in earlier days are now able to associate with more advanced and foolproof access control techniques. And the field of Access Control Systems (ACSs) using modern approaches has become a major means of providing security in all applications, both military and civilian.

APA, Harvard, Vancouver, ISO, and other styles

40

Janardhana, Swamy V. C. "Electronic Access Control Systems: A New Approach." Thesis, Indian Institute of Science, 1994. http://hdl.handle.net/2005/237.

Full text

Abstract:

Security systems are gaining increasing importance in recent times to protect life and valuable resources. Many advanced methods of providing security have been developed and are in use in the last few decades. Of these, one important area is the security system required for military/strategic applications, which has advanced greatly. But, such systems being complex and expensive are useful in high-end applications only. However, with the recent progress in technology and the growing need for increased security in civilian and other applications, many low cost solutions for security systems have now emerged. As a result, many applications where only a simple intruder alarm was the means of providing security in earlier days are now able to associate with more advanced and foolproof access control techniques. And the field of Access Control Systems (ACSs) using modern approaches has become a major means of providing security in all applications, both military and civilian.

APA, Harvard, Vancouver, ISO, and other styles

41

Sardesai, Shailesh. "On reliability estimation of large electronic systems." Ohio : Ohio University, 1997. http://www.ohiolink.edu/etd/view.cgi?ohiou1177012132.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Mahajan, Nikhil R. "System Protection for Power Electronic Building Block Based DC Distribution Systems." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-12052004-233822/.

Full text

Abstract:

The purpose of this research has been to develop an agent based protection and reconfiguration scheme for power electronic building block based (PEBB) DC distribution systems. One of the foremost applications would be in the new zonal DC distribution on naval ships. The research involves the design of an agent based protection scheme which uses the PEBBs for current limiting and circuit breaking purposes. Considerations are given to reduce the system downtime under fault conditions, allow proper coordination and provide backup protection. The research also involves the design of a reconfiguration management scheme based on collaborative agents. The collaboration ensures that the reconfiguration is achieved at a global level, enhancing the system survivability under the conditions of multiple faults and damages. The coordination ensures that only the faulted part of the system is isolated and the reconfiguration makes sure that the power to the healthy part of the system is supplied continuously. The reconfiguration management also performs load shedding if the generation does not meet the load demand of the reconfigured system due to a fault or damage in the generator.

APA, Harvard, Vancouver, ISO, and other styles

43

Basu, A. "Development of materials and methods for the next generation electronic, electrochemical and opto-electronic device systems." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2016. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/5876.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Segall, Darren Eric 1970. "Coarse-graining electronic behavior in condensed matter systems : from electrons to continuum elasticity." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29307.

Full text

Abstract:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002.
Includes bibliographical references (leaves 131-137).
In this thesis properties of various condensed matter systems are studied, whose dependency on electronic behavior is incorporated through coarse-grained interactions. Three specific systems are considered. In the first system of study, high momentum, plane wave states of the electronic wave function are coarse-grained, while the low momentum states are fully resolved. Moreover, the coarse-graining procedure incorporates the response of the high momentum states to environmental changes and its couplings to changes in the low momentum states. Within density functional theory this allows the representation of the electronic wave function, when using a plane wave basis, to be computationally feasible without having to make the pseudopotential approximation. This coarse-graining procedure is beneficial for the study of high pressure systems, where the response of the core region is important. With this method we study a number of solid phases of boron and reveal a number of important structural and electronic properties on its high pressure and superconducting phase. The second system of study focuses on a slightly coarser scale, where a theory for the elasticity of nanometer sized objects is developed. This theory provides a powerful way of understanding nanoscale elasticity in terms of local group contributions and acts as a bridge between the atomic and the continuum regimes. This theory properly describes elastic fluctuations on length scales on the order of the decay length of the force constant matrix; allowing for straightforward development of new relations between the bending and stretching properties of nanomechanical resonators, which prove to be much more accurate than the continuum-based relations currently employed in experimental analysis.
(cont.) This theory is then used to link features of the underlining electronic structure to the local elastic response in silicon nanoresonators, emphasizing the importance of electronic structure on the local and overall elastic response. Our final system of study focuses on the longest length scales, the continuum. It is shown that the inclusion of electronic structure is crucial in the study of the role of dislocations on the macroscopic property of slip. This thesis explores the discrepancy between experimental data and theoretical calculations of the lattice resistance in bcc metals. This thesis presents results for the temperature dependence of the Peierls stress and the first ab initio calculation of the zero-temperature Peierls stress which employ periodic boundary conditions. The ab initio value for the Peierls stress is over five times larger than current extrapolations of experimental lattice resistance to zero-temperature. Although it is found that the common techniques for such extrapolation indeed tend to underestimate the zero-temperature limit, in this work it is shown that other mechanisms other than the simple Peierls mechanism are important in controlling the process of low temperature slip.
by Darren Eric Segall.
Ph.D.

APA, Harvard, Vancouver, ISO, and other styles

45

Yu, Hong. "Creating Public Trust in Electronic Voting Systems." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224219.

Full text

Abstract:

There are many positive aspects of electronic voting systems: security, verifiability, convenience, resource conservation, and the like. However, there is still lack of trust for electronic voting systems within the public. One of the reasons could be that the notions involved in electronic voting are challenging to understand for the general public. In this project, we tried to create public trust through an explanation system. An explanation system was made to explain how a modern electronic voting system works. User testing was performed after that, to verify whether this explanation system is able to increase people’s trust in electronic voting system. After analysing the data collected through the user testing, we got promising results to believe that this explanation can be used to create public trust in electronic voting systems.
Det finns många positiva aspekter av elektroniska röstningssystem: säkerhet, verifierbarhet, bekvämlighet, resursbesparingar, och liknande. Emellertid så saknas det fortfarande hos allmänheten tillit till elektroniska röstningssystem. Ett av skälen till detta skulle kunna vara att idéerna i samband med elektronisk röstning är utmanande att förstå för allmänheten. I detta projekt har vi försökt att skapa allmän tillit med hjälp av ett förklaringssystem. Ett förklaringssystem tillverkades för att förklara hur ett modernt elektroniskt röstningssystem fungerar. Användartester utfördes därefter, för att verifiera huruvida detta förklaringssystem förmådde öka människors tillit till elektroniska röstningssystem. Efter analys av data insamlade genom användartesterna, fick vi lovande resultat som gav oss anledning att tro att detta slags förklaring kan användas för att skapa allmän tillit till elektroniska röstningssystem.

APA, Harvard, Vancouver, ISO, and other styles

46

Taylor, Daniel J. "Correlated electronic structure theory for challenging systems." Thesis, Heriot-Watt University, 2015. http://hdl.handle.net/10399/3004.

Full text

Abstract:

The photochemistry of molecules can be investigated computationally, and this provides great insight into the underlying chemistry and physics. Such computational approaches are challenging and can pose many difficulties compared to ground state methodologies. Care must be taken to accurately describe these systems, as some lowlevel approximate methods can fail. The geometrical and electronic structures (TiO2)n clusters (n=1-4) have been investigated. These are of enormous technological interest as wide band-gap semiconductors yet the nature of electronic transitions in nano-sized clusters has yet to be fully elucidated. Structures of the neutral closed-shell, radical cationic and radical anionic clusters at each size are described and rationalised in terms of the pseudo-Jahn- Teller effect. We have used high-level response theory to set benchmarks for such systems. The TiO2 monomer is the simplest of the clusters studied yet proves a stern test for many lower order ab-initio methods. It is shown that high-level methods are required to properly describe this simple molecule. The Monte Carlo Configuration Interaction method attempts to combine the power of Full CI with a scalability that allows it to be used to study much larger systems. It can be systematically improved and can approach the accuracy of the Full CI method. This method is applied here to investigate potential energy surfaces and multipole moments of a range of small but challenging systems.

APA, Harvard, Vancouver, ISO, and other styles

47

Shang, Alain. "Transceiver arrays for optically interconnected electronic systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ37024.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Duranceau, Ellen. "Electronic Resource Management Systems From ILS Vendors." Against the Grain, 2004. http://hdl.handle.net/1721.1/18191.

Full text

Abstract:

For several years libraries, especially larger libraries and research libraries, have been more and more desperately seeking systems and tools to help them manage electronic resources for several years. To date, most libraries seeking support for the full life cycle of electronic resource management (ERM) from selection through purchase, access, license management, and renewal or cancellation, have had to build their own systems, and many have done so. In addition to these homegrown systems, commercial sources have emerged to support ERM: there are those from third party serial and/or serial data vendors, such as EBSCO, SerialsSolutions, and TDNet; and those from major vendors of integrated library systems (ILS), such as Innovative Interfaces Inc. (III), which has an ERM system currently on the market, and other ILS vendors who are in varying stages of developing ERM functionality.[1] This article is an overview of the latter market.

APA, Harvard, Vancouver, ISO, and other styles

49

Desai, Anand Hasmukh. "Thermal management of small scale electronic systems." Diss., Online access via UMI:, 2006.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

50

Zheng, Xiao. "Quantum mechanical simulation of open electronic systems." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38717657.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Electronic systems'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles