Dissertations / Theses: 'Line method'

1

Keen, Alan G. "Planar transmission line analyses using the Method of Lines." Thesis, University of Kent, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293993.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Batty, Eric Richard. "A novel transmission line monitoring method." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326654.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Jensen, Ward Calvin. "A capillary method for line tension determination." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq22607.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Santos, Pedro. "Approximation Methods for Convolution Operators on the Real Line." Doctoral thesis, Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200500362.

Full text

Abstract:

This work is concerned with the applicability of several approximation methods (finite section method, Galerkin and collocation methods with maximum defect splines for uniform and non uniform meshes) to operators belonging to the closed subalgebra generated by operators of multiplication bz piecewise continuous functions and convolution operators also with piecewise continuous generating function.

APA, Harvard, Vancouver, ISO, and other styles

5

Berg, Jonas, and Jarmo Luukkonen. "Method to off-line program robotized metal deposition." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-1350.

Full text

Abstract:

This report is a ten credit degree project and is aimed at technically skilful personnel at Volvo Aero Corporation and at the University West. The goal of the project is to create a robot program that can manufacture a part by Metal Deposition from a 3-D CAD model (Unigraphics) via a CAM module and a CAR program (IGRIP) to an ABB robot. Metal Deposition is a method to build new parts, add material to an existing part and repair components that have been damaged in earlier processes. The method can be used with different kinds of welding with powder or welding wire as the additive material. Three reference geometries were used; two bosses and a circular sweep. UG/CAM is used to create the CLS (Cutter Location Source) data. Different milling operations are used to emulate welding.The program which imports the coordinates from the CLS data to IGRIP, as well as the export program, was written in GSL (Graphics Simulation Language). GSL is a Pascal-like programming language used to control the behaviour of simulation models. The import program reads linear movement coordinates line by line until the whole CLS file has been converted into IGRIP. UG/CAM should only use linear movement when using this program. If circular movements are used, a feature that converts those has to be added to the import program.

APA, Harvard, Vancouver, ISO, and other styles

6

Boston, Ian Edward. "Transient stress analysis by the transmission line method." Thesis, University of Hull, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259799.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Kim, Sangwoo. "Multiconductor transmission line analysis using surface ribbon method /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Elkalsh, Ahmed. "Coupled electro-thermal transmission line modelling (TLM) method." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40661/.

Full text

Abstract:

The theme of this thesis is concerned with the modelling of the multi-physics interactions that occur in lightning and arc discharge. The main contributions of this research are presented as combining different physical studies namely, electromagnetic (EM) propagation, thermal diffusion and non-linear materials using a numerical algorithm. The algorithm was developed based on the two dimensional (2D) numerical transmission line method (TLM). The algorithm was applied to several practical examples namely, to model the electro-thermal analysis and the temperature development in a plasmonic nano-heat sources for terahertz applications; to predict the shape and the location of an arc discharge channel caused by a lightning strike using electro-thermal analysis, and to model diverter strips for lightning protection on aeroplanes. Different electro-thermal coupling approaches, such as fully and partially coupled methods were used to investigate the efficiency and accuracy of the model. In the fully coupled method the thermal model was allowed to change the electrical properties of materials in the electromagnetic model. On the other hand partial coupling did not consider the temperature dependency of the electrical properties in the electromagnetics model. Both of the models used the dissipated power from the electromagnetic model as a source signal to evaluate the temperature profile in the thermal model. Also different coupling interval timesteps were investigated to minimize the computational power needed without affecting the model accuracy.

APA, Harvard, Vancouver, ISO, and other styles

9

Khy, Sophoin, Yoshiharu Ishikawa, and Hiroyuki Kitagawa. "A Novelty-based Clustering Method for On-line Documents." Springer, 2007. http://hdl.handle.net/2237/7739.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Rebel, Jürgen N. "On the foundations of the transmission line matrix method." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959770089.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Xie, Tong 1968. "On-line tool misalignment detection using an imaging method." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282474.

Full text

Abstract:

The Opticam spherical surface generator is developed at the Center for Optics Manufacturing (COM). It combines computer-numerical-control (CNC) technology with bound abrasive ring grinding geometry to create advantages over the conventional loose abrasive grinding systems in flexibility, productivity and accuracy. The Opticam SX utilizes a ring grinding geometry to generate spherical surfaces. By adjusting the tilt angle and the diameter of the ring cutter, the Opticam is capable of generating spherical surfaces with an essentially unlimited range of radius of curvature. This ring grinding geometry, however, requires a precise alignment between the cutter and the generated part. Residual cutter misalignments in the machine setup cause the finished surface to deviate from the design shape. Current tool misalignment detection techniques seriously limit the productivity of the Opticam system, and a new metrology system is introduced in this dissertation. The new system is geometrical ray trace based, and has some similarities to the moire deflectometry techniques. It uses a non-contact method to measure surface slope errors from images reflected off Opticam generated surfaces. The detected slope errors are used to determine the corresponding tool misalignments in the Opticam generator. The system setup is simple and not sensitive to vibrations. This system is compatible with the wet grinding environment. Furthermore, this new metrology system is capable of measuring surfaces with a wide range of radius of curvature from convex to concave. A prototype system was built based on this technique. It has been evaluated on-line in the Opticam SX. A surface wetting technique is used to allow detection on Opticam generated surfaces independent of the actual surface finish. The experimental results suggested that the on-line detection system is capable of detecting tool misalignment corresponding to a peak-to-valley surface figure error that is 1 mum or greater on ground surfaces. Better than 0.5 μm peak-to-valley surface error detection was achieved on specular surfaces. It was also found that machine dwell produces surface figure errors that are opposite to the errors produced by y-direction tool misalignment. Best surface figures are achieved when machine dwell errors are balance by residual tool misalignments in the Opticam machine.

APA, Harvard, Vancouver, ISO, and other styles

12

Johns, David Philip. "A three-dimensional frequency-domain transmission-line modelling method." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318645.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Jang, Young Jae 1974. "Multiple part type decomposition method in manufacturing processing line." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/89318.

Full text

Abstract:

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2001.
"June 2001."
Includes bibliographical references (leaf 67).
by Young Jae Jang.
S.M.

APA, Harvard, Vancouver, ISO, and other styles

14

Yang, Xiaolin. "Direct and Line Based Iterative Methods for Solving Sparse Block Linear Systems." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543921330763997.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Lowe, Bradley Shayne. "A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/56607.

Full text

Abstract:

Transmission line parameters play a significant role in a variety of power system applications. The accuracy of these parameters is of paramount importance. Traditional methods of determining transmission line parameters must take a large number of factors into consideration. It is difficult and in most cases impractical to include every possible factor when calculating parameter values. A modern approach to the parameter identification problem is an online method by which the parameter values are calculated using synchronized voltage and current measurements from both ends of a transmission line. One of the biggest problems facing the synchronized measurement method is line transposition. Several methods have been proposed that demonstrate how the line parameters of a transposed line may be estimated. However, the present case of today's power systems is such that a majority of transmission lines are untransposed. While transposed line methods have value, they cannot be applied in real-world scenarios. Future efforts of using synchronized measurements to estimate transmission line parameters must focus on the development and refining of untransposed line methods. This thesis reviews the existing methods of estimation transmission line parameters using synchrophasor measurements and proposes a new method of estimating the parameters of an untransposed line. After the proposal of this new method, a sensitivity analysis is conducted to determine its performance when noise is present in the measurements.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

16

Choong, Yew Kwan. "Advanced modal expansion techniques for the transmission line modelling method." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403698.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Basl, Peter A. W. Bakr Mohamed H. Nikolova Natalia K. "An adjoint variable method for time-domain transmission line modeling." *McMaster only, 2007.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

18

He, Xi M. Eng Massachusetts Institute of Technology. "An optimization grouping method in a multi-line manufacturing system." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/63231.

Full text

Abstract:

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 59).
A tailored product grouping method using binary integer linear program for optimization is developed for two production lines in a food packaging manufacturer. A mathematical model is created to assign products to the two dedicated production lines with an objective to minimize the total setup times. The optimization model is subject to capacity constraints on each line. With the demand of each product entered, the model is able to generate an optimal production grouping and sequence as well as the minimal total setup time required. Compared with CAS current fixed grouping method, this linear program grouping method reduces total setup time generally by 17% and prevents both production lines from overloading. Also, this grouping method allows the Make-to-Order food packaging manufacturer to respond to changes in demand volume and product mix by changing the product grouping accordingly.
by He Xi.
M.Eng.

APA, Harvard, Vancouver, ISO, and other styles

19

Fares, Mazen. "Evaluation method of the saturation level of a railway line." Thesis, KTH, Transportplanering, ekonomi och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191163.

Full text

Abstract:

Saturation is becoming more and more of an issue for infrastructure owners, but there is no existing method to measure it. This master thesis aims at suggesting a method in order to evaluate the saturation level of a railway line. Saturation has an ambiguous definition. It deals with capacity issues, timetable stability and robustness, and with delay issues. Three methods are mainly studied, each one defining saturation from a different angle, and meeting a different definition of saturation. These methods are the compression method, defining saturation as a capacity issue, the robustness method, and the regularity method, i.e. delays analysis. A fourth method is created and studied in order to complete the previous three. The idea is to find the relevant indicators to evaluate saturation. These methods are first studied from a theoretical perspective before being applied to a study case to choose the relevant indicators. This study case involves a statistical analysis and a dynamic simulation of the graphical timetable. The results show that the regularity method is irrelevant to study saturation. The method suggested by this master thesis in order to evaluate saturation is a two-step method. The first step is the diagnosis based on the compression method and the traffic heterogeneity. The second step is the comparison between different scenarios to reduce saturation: this step is based on the compression method, the robustness method and the traffic heterogeneity. This method can later be used for an economic study or a multi-criteria analysis.

APA, Harvard, Vancouver, ISO, and other styles

20

Chen, Zhizhang. "The transmission line matrix (TLM) method and its boundary treatments." Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/10888.

Full text

Abstract:

The Transmission Line Matrix (TLM) numerical algorithm, based on the discrete Huygens' principle, has been extensively used to solve electromagnetic structure problems. The major advantage of this method is its simplicity and flexibility as the vectorial Maxwell's Equations are transformed into a simple numerical model of digital signal processing system. In this thesis, new and efficient numerical modeling concepts and procedures have been developed for the analysis of electromagnetic structures with the TLM method: (1) With the introduction of the equivalent field quantities defined between nodes, the TLM Method has been shown to be exactly equivalent to a finite-difference timedomain (FD-TD) formulation. Therefore, the numerical foundation of the TLM approach has been fully demonstrated and the basis for mathematically understanding the TLM method has been provided. As a result, the conventional TLM boundary conditions has been verified theoretically, and hence a systematic way for constructing the TLM boundary conditions has been developed. In addition, a new boundary description for the TLM method has been proposed, which renders TLM method more flexibility in its boundary treatments. (2) Based on the equivalence between the TLM method and the FD-TD method, an absorbing and a connecting boundary formulations have been developed for TLM simulations. With these formulations, the TLM method can be applied for solving more realistic scattering and radiation problems with open structures. The computation examples given in this thesis are with the structures of waveguides, two-dimensional and three-dimensional obstacles illuminated by plane waves. The numerical results show good agreement with those obtained with the Method of Moment, and thus validate the boundary conditions developed. (3) By using the discrete Fourier Transform, a new algorithm has been developed for interfacing the TLM method with the frequency-domain solutions. The technique employ the prior knowledge of frequency-domain solutions at boundaries and combine them with TLM simulations, leading to considerable decrease in memory and CPU time. It also allows the TLM method to be used with highly conductive materials for solving shielding problems. The good results were obtained with significant reduction of the computation expenditure.

APA, Harvard, Vancouver, ISO, and other styles

21

Meng, Xuesong. "Modelling multi-scale problems in the transmission line modelling method." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14461/.

Full text

Abstract:

Modern electromagnetic problems are becoming increasingly complex and their simulation must take into account geometrical features that are both large and small compared to the wavelength of interest. These multi-scale problems lead to a heavy computational burden in a discretised computational simulation approach since the small features require fine mesh to be used in the simulation, resulting in large run time and memory storage. To overcome such problems, this thesis presents an efficient and versatile method for embedding small features into an otherwise coarse mesh. The embedded model eliminates the need for discretising the small features and allows for a relative large mesh size to be used, thus saving the computational costs. The subject of the thesis is embedding a thin film as a small feature into the numerical Transmission Line Modelling (TLM) method, although any small feature with known analytical response can be implemented in practice. In the embedded model, the thin film is treated as a section of transmission line, whose admittance matrix is used to describe the frequency response of the thin film. The admittance matrix is manipulated by expanding the constituent cotangent and cosecant functions analytically, and then transforming them from the frequency domain to the time domain using the inverse Z transform and general digital filter theory. In this way the frequency responses of the thin film are successfully embedded into the TLM algorithm. The embedded thin film model can be applied to both single and multiple thin film layers. The embedded thin film model has been implemented in the one-dimensional (1D) and two-dimensional (2D) TLM method in the thesis. In the 1D TLM method, the embedded thin film model is used to investigate the reflection and transmission properties of lossy,anisotropic and lossless thin films, e.g. carbon fibre composite (CFC) panels, titanium panels, antireflection (AR) coatings and fibre Bragg gratings (FBG). The shielding performance of CFC panels is also discussed. In the 2D TLM method, the embedded thin film model is extended to model arbitrary excitations and curved thin films. The electromagnetic behaviour of infinitely long CFC panels with oblique incidence and a CFC panel of finite length with a point source excitation are studied using the embedded thin film model. The resonant effects of CFC circular and elliptical resonators and the shielding performance of a CFC airfoil with the profile of NACA2415 are investigated using the embedded curved thin film model. In addition, the effects of small gaps in the airfoil structure on the shielding performance are also reported. All the examples discussed in the thesis have validated the accuracy, stability, convergence and efficiency of the embedded thin film model developed. At the same time, the embedded thin film model has been proven to have the advantage of significantly saving computational overheads.

APA, Harvard, Vancouver, ISO, and other styles

22

Lahmar, Mustafa. "ESTIMATION OF TRANSMISSION LINE PARAMETERS USING LINEAR METHOD WITH SYNCHRONIZED AND UNSYNCHRONIZED DATA." UKnowledge, 2019. https://uknowledge.uky.edu/ece_etds/135.

Full text

Abstract:

Accurate value of transmission line parameters is important for power system protection applications, especially for distance relays whose zone settings are based on positive sequence line impedance. The research is devoted to estimating transmission line positive-sequence parameters from synchronized or unsynchronized measurements of voltage and current phasors that are obtained at both terminals of the line. The positive sequence parameters including series impedance and shunt admittance can be linearly estimated. The linear least square algorithm has been derived in this dissertation for different transmission line configurations. The algorithm is able to handle both synchronized and unsynchronized measurements and deal with potential synchronization errors by explicitly modeling the synchronization angle. Sample results are reported to demonstrate the effectiveness of the proposed method. Three types of transmission line models depending on line length (long, medium and short) are studied in this dissertation. Chapter 3 uses unsynchronized data for the long transmission line. The derived method can detect the unsynchronized angle and estimate the positive sequence of long line parameters. The proposed method is examined with negative impacts such as errors on currents and voltages data. These errors are added randomly to one set each time to test the robustness of the developed algorithm. The medium transmission line algorithm derivation is presented in chapter 4. This chapter uses a linear least square to estimate the lumped parameters of a medium transmission line. The two different transmission line circuits are used to model the medium line. The first circuit is a single transmission line with two nodes and is used to evaluate the developed algorithm. The second circuit is a double transmission line. These two lines can have the same or different line parameters or line length. The developed algorithm shows that the proposed method achieves highly accurate results for the estimation of positive sequence line parameters. The short transmission line is studied in chapter 5. The short transmission line uses less data than the long or medium lines because in this model the shunt capacitance is omitted. Thus, the linear estimation yields highly accurate results. Case studies are considered to test the robustness of this developed method. The line temperature mainly affects the series resistance, and the developed algorithms in previous three chapters can accurately estimate the transmission line parameters. To simplify the real-time estimation of line resistance and temperature, the series inductance, and shunt capacitance can be treated as constant and known values. Chapter 6 provides such studies of estimating resistance by treating inductance and capacitance as known values.

APA, Harvard, Vancouver, ISO, and other styles

23

Santiago, Marco. "THE CHORUS: A LINE TO CROSS." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3633.

Full text

Abstract:

ABSTRACT This thesis project will provide an in depth examination into the musical theater role of Paul, the male Puerto Rican dancer in A Chorus Line, as performed by Marco Antonio Santiago. The performance will take place at Cohoes Musical Theater in Albany, New York. This examination will reveal how the application of Stanislavski's methods on acting and his views in preparing a character can be used on musical theatre roles to achieve well rounded, fully developed and completely believable characters. The thesis will contain a structural analysis of the script, scene and role analysis, a performance journal to log the growth/challenges of each role, and other vital information charting the application of Stanislavski's methods on acting. In addition to Stanislavski's methods other well known acting teachers and their methods such as Richard Boleslavski and Sanford Meisner, will be viewed and applied throughout the process. Furthermore, a performance critique/analysis will be provided by Lani Harris, Tan Huaixiang, and Nicholas Wuehrmann, who serve as the acting committee members for this thesis project. The role of Paul helps propel the action of the play forward allowing the audience to truly realize the themes provided by the playwright, lyricist, and composer. This thesis project will reveal that an actor's training can be applied in almost any venue of theatre in some form or fashion and successfully make a well-rounded character.
M.F.A.
Department of Theatre
Arts and Humanities
Theatre

APA, Harvard, Vancouver, ISO, and other styles

24

Bokka, Naveen. "Comparison of Power Flow Algorithms for inclusion in On-line Power Systems Operation Tools." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1237.

Full text

Abstract:

The goal of this thesis is to develop a new, fast, adaptive load flow algorithm that "automatically alternates" numerical methods including Newton-Raphson method, Gauss-Seidel method and Gauss method for a load flow run to achieve less run time. Unlike the proposed method, the traditional load flow analysis uses only one numerical method at a time. This adaptive algorithm performs all the computation for finding the bus voltage angles and magnitudes, real and reactive powers for the given generation and load values, while keeping track of the proximity to convergence of a solution. This work focuses on finding the algorithm that uses multiple numerical techniques, rather than investigating programming techniques and programming languages. The convergence time is compared with those from using each of the numerical techniques. The proposed method is implemented on the IEEE 39-bus system with different contingencies and the solutions obtained are verified with PowerWorld Simulator, a commercial software for load flow analysis.

APA, Harvard, Vancouver, ISO, and other styles

25

Ren, Manling. "Algorithms for off-line recognition of Chinese characters." Thesis, Nottingham Trent University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245175.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Zettersten, Camilla. "On-line Electrochemistry Electrospray Ionisation Mass Spectrometry : Method Development and Applications." Doctoral thesis, Uppsala universitet, Analytisk kemi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-99329.

Full text

Abstract:

This thesis deals with studies of on-line electrochemistry electrospray ionisation mass spectrometry (EC/ESI-MS). It is shown that the use of EC/ESI-MS demands optimal coupling characteristics. Pre-concentration and desalting, due to matrix exchange, were demonstrated for the model substance 1-hexanethiol in an EC/ESI-MS setup. The setup was also used for investigations of the oxidation states of the manganese complex [Mn2(bpmp)(µ-OAc)2][ClO4], where bpmp is a 2,6-bis[[N,N-di(2-pyridylmethyl)amino]methyl]-4-methylphenol compound. The manganese complex, which is relevant to artificial photosynthesis, was found to be a good model compound for the EC/ESI-MS studies, thanks to its many oxidation states. For the first time, the presence of the Mn(III,IV) state of the manganese complex was demonstrated in the studies. During the experimental work, the importance of the electrode positioning within the electrochemical cell was investigated. Different EC cell configurations were studied using the manganese complex as a model substance. It was clearly shown that the EC cell design influences the distribution between the peaks in the mass spectra - not only for manganese complexes and Olsalazine but also for 4-chloroaniline. A previously unknown comproportionation reaction was found for 4-chloroaniline involving the oxidised dimer, 4-[(4-chlorophenyl)imino]-2,5-cyclohexadien-1-imine. This reaction explained the unexpected presence of the signal due to the reduced dimer, 4-amino-4'-chlorodiphenylamine, in the mass spectra. Furthermore, it was shown that EC/ESI-MS was successful in conjunction with miniaturised gold wire electrodes in a PDMS chip within which dopamine was oxidised with a conversion efficiency of 30%. The oxidation products of dopamine were detected after 0.6-1.2 seconds for 1.0 and 0.5 µl/min, respectively. The combination of electrochemically controlled solid-phase extraction (EC-SPE) with ESI-MS was found to be less straightforward than detecting anions pre-concentrated on a polypyrrole coated electrode with EC-SPE/ICP-MS. The on-line combination of liquid chromatography with EC/ESI-MS/MS for studying antioxidants in yellow onion extracts was shown to be fast and a relatively easy complement to classical antioxidant activity determinations.

APA, Harvard, Vancouver, ISO, and other styles

27

Stubbs, David Michael. "Modelling distributed amplifier structures using the transmission line matrix (TLM) method." Thesis, University of Hull, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395515.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Herring, Jonathan L. "Developments in the transmission-line modelling method for electromagnetic compatibility studies." Thesis, University of Nottingham, 1993. http://eprints.nottingham.ac.uk/27911/.

Full text

Abstract:

The transmission-line modelling (TLM) method is applied to 3-dimensional problems in electromagnetic compatibility (EMC). The method is found to be a versatile tool which is ideally suited to the modelling of many EMC systems. A new way of deriving the scattering properties of the TLM node is presented and the derivation of mesh parameters, the application of boundary conditions and methods of applying excitation and of taking outputs are described. Issues regarding the efficient implementation of the TLM algorithm and a way of running very large simulations are reported. A multigrid method is introduced which allows meshes of different resolutions to be connected together to form a complete system. The method is used to apply fine resolution only in areas where it is required and to move numerical boundaries away from the region of interest. Comparisons are made with the more traditional graded mesh technique, using the hybrid node. Results are presented for a number of different systems with particular emphasis on the environment in which radiated emission tests are undertaken, although more general systems are also considered. The consequences of making measurements in an unlined screened room are discussed and ways of damping resonances are investigated. Wire, slot and spherical dipole antennas are modelled. Field-to-wire coupling, the TEM cell, a simplified device under test, the shielding properties of a vehicle body and the current induced by a simplified table-top device are also considered. Techniques are developed to obtain the Q factor of a screened room loaded with radiation absorbing material (RAM) and to obtain the radiation resistance of an antenna in free-space and also in close proximity to conducting surfaces.

APA, Harvard, Vancouver, ISO, and other styles

29

Dvornáková, Táňa. "Výběrová zjišťování on-line." Master's thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-10989.

Full text

Abstract:

Thesis deals with modern ways of surveys using advancing information technology and internet which makes surveys using web applications more effective. After a short review of public opinion history the summary of principal czech and forign survey organizations engaged in determination of survey rules are presented. Thesis follows with description of classic and modern data collecting methods. Main attention is devoted to on-line survey method. The description of method, possibilities of realization, positives and negatives and use of on-line questionnaire survey are presented. Final part of thesis si focused on on-line survey applying. The quality of this method is considered by sociological survey.

APA, Harvard, Vancouver, ISO, and other styles

30

Hurst, Alfred Ian. "TLM modelling of the thermal experience of vitreous china ware during firing in a tunnel kiln." Thesis, University of Hull, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314119.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Spencer, Benjamin. "On-line C-arm intrinsic calibration by means of an accurate method of line detection using the radon transform." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAS044/document.

Full text

Abstract:

Les ``C-arm'' sont des systémes de radiologie interventionnelle fréquemment utilisés en salle d'opération ou au lit du patient. Des images 3D des structures anatomiques internes peuvent être calculées à partir de multiples radiographies acquises sur un ``C-arm mobile'' et isocentrique décrivant une trajectoire généralement circulaire autour du patient. Pour cela, la géométrie conique d'acquisition de chaque radiographie doit être précisément connue. Malheureusement, les C-arm se déforment en général au cours de la trajectoire. De plus leur motorisation engendre des oscillations non reproductibles. Ils doivent donc être calibrés au cours de l'acquisition. Ma thèse concerne la calibration intrinsèque d'un C-arm à partir de la détection de la projection du collimateur de la source dans les radiographies.Nous avons développé une méthode de détection de la projection des bords linéaires du collimateur. Elle surpasse les méthodes classiques comme le filtre de Canny sur données simulées ou réelles. La précision que nous obtenons sur l'angle et la position (phi,s) des droites est de l'ordre de: phi{RMS}=+/- 0.0045 degrees et s{RMS}=+/- 1.67 pixels. Nous avons évalué nos méthodes et les avons comparés à des méthodes classiques de calibration dans le cadre de la reconstruction 3D
Mobile isocentric x-ray C-arm systems are an imaging tool used during a variety of interventional and image guided procedures. Three-dimensional images can be produced from multiple projection images of a patient or object as the C-arm rotates around the isocenter provided the C-arm geometry is known. Due to gravity affects and mechanical instabilities the C-arm source and detector geometry undergo significant non-ideal and possibly non reproducible deformation which requires a process of geometric calibration. This research investigates the use of the projection of the slightly closed x-ray tube collimator edges in the image field of view to provide the online intrinsic calibration of C-arm systems.A method of thick straight edge detection has been developed which outperforms the commonly used Canny filter edge detection technique in both simulation and real data investigations. This edge detection technique has exhibited excellent precision in detection of the edge angles and positions, (phi,s), in the presence of simulated C-arm deformation and image noise: phi{RMS} = +/- 0.0045 degrees and s{RMS} = +/- 1.67 pixels. Following this, the C-arm intrinsic calibration, by means of accurate edge detection, has been evaluated in the framework of 3D image reconstruction

APA, Harvard, Vancouver, ISO, and other styles

32

Boud, Andrew Charles. "The development of an off-line robot programming method using virtual reality." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Benner, P., and R. Byers. "Newtons method with exact line search for solving the algebraic Riccati equation." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199800775.

Full text

Abstract:

This paper studies Newton's method for solving the algebraic Riccati equation combined with an exact line search. Based on these considerations we present a Newton{like method for solving algebraic Riccati equations. This method can improve the sometimes erratic convergence behavior of Newton's method.

APA, Harvard, Vancouver, ISO, and other styles

34

Demidenok, Konstantin. "Polyelectrolyte nanostructures formed in the moving contact line: fabrication, characterization and application: Polyelectrolyte nanostructures formed in the moving contact line: fabrication, characterization and application." Doctoral thesis, Technische Universität Dresden, 2009. https://tud.qucosa.de/id/qucosa%3A25246.

Full text

Abstract:

Having conducted the research described in this thesis I found that there exists a possibility to produce polyelectrolyte nanostructures on hydrophobic surfaces by application of the moving contact line approach. It was demonstrated that the morphology of nanostructures displays a range of structure variations from root-like to a single wire structure with a high anisotropy and aspect ratio (providing diameters of several nanometers and the length limited by the sample surface dimensions). Such nanostructures can be produced exactly on the spot of interest or can be transferred from the surface where they were produced to any other surfaces by the contact printing technique. A model describing the polymer deposition during the moving contact line processes on hydrophobic surfaces has been proposed. The application of this model provides the ground for an explanation of all the obtained experimental data. Utilizing moving contact line approach aligned one-dimensional polycation structures were fabricated and these structures were used as templates for assembling amphiphile molecules. Quasiperiodic aligned and oriented nanostructures of polyelectrolyte molecules formed in moving droplets were utilized for fabrication of electrically conductive one-dimensional nanowires.

APA, Harvard, Vancouver, ISO, and other styles

35

FUKUDA, Toshio, Guisheng ZHAI, and Xinkai CHEN. "Robust On-Line Frequency Identification for a Sinusoid." Institute of Electronics, Information and Communication Engineers, 2006. http://hdl.handle.net/2237/14999.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Demidenok, Konstantin. "Polyelectrolyte nanostructures formed in the moving contact line: fabrication, characterization and application." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-27327.

Full text

Abstract:

Having conducted the research described in this thesis I found that there exists a possibility to produce polyelectrolyte nanostructures on hydrophobic surfaces by application of the moving contact line approach. It was demonstrated that the morphology of nanostructures displays a range of structure variations from root-like to a single wire structure with a high anisotropy and aspect ratio (providing diameters of several nanometers and the length limited by the sample surface dimensions). Such nanostructures can be produced exactly on the spot of interest or can be transferred from the surface where they were produced to any other surfaces by the contact printing technique. A model describing the polymer deposition during the moving contact line processes on hydrophobic surfaces has been proposed. The application of this model provides the ground for an explanation of all the obtained experimental data. Utilizing moving contact line approach aligned one-dimensional polycation structures were fabricated and these structures were used as templates for assembling amphiphile molecules. Quasiperiodic aligned and oriented nanostructures of polyelectrolyte molecules formed in moving droplets were utilized for fabrication of electrically conductive one-dimensional nanowires.

APA, Harvard, Vancouver, ISO, and other styles

37

Cayan, Fatma Nihan. "The Method Of Lines Solution Of Discrete Ordinates Method For Nongray Media." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607401/index.pdf.

Full text

Abstract:

A radiation code based on method of lines (MOL) solution of discrete ordinates method (DOM) for the prediction of radiative heat transfer in nongray absorbing-emitting media was developed by incorporation of two different gas spectral radiative property models, namely wide band correlated-k (WBCK) and spectral line-based weighted sum of gray gases (SLW) models. Predictive accuracy and computational efficiency of the developed code were assessed by applying it to the predictions of source term distributions and net wall radiative heat fluxes in several one- and two-dimensional test problems including isothermal/non-isothermal and homogeneous/non-homogeneous media of water vapor, carbon dioxide or mixture of both, and benchmarking its steady-state predictions against line-by-line (LBL) solutions and measurements available in the literature. In order to demonstrate the improvements brought about by these two spectral models over and above the ones obtained by gray gas approximation, predictions obtained by these spectral models were also compared with those of gray gas model. Comparisons reveal that MOL solution of DOM with SLW model produces the most accurate results for radiative heat fluxes and source terms at the expense of computation time when compared with MOL solution of DOM with WBCK and gray gas models. In an attempt to gain an insight into the conditions under which the source term predictions obtained with gray gas model produce acceptable accuracy for engineering applications when compared with those of gas spectral radiative property models, a parametric study was also performed. Comparisons reveal reasonable agreement for problems containing low concentration of absorbing-emitting media at low temperatures. Overall evaluation of the performance of the radiation code developed in this study points out that it provides accurate solutions with SLW model and can be used with confidence in conjunction with computational fluid dynamics (CFD) codes based on the same approach.

APA, Harvard, Vancouver, ISO, and other styles

38

Guden, Huseyin. "An Adaptive Simulated Annealing Method For Assembly Line Balancing And A Case Study." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607478/index.pdf.

Full text

Abstract:

Assembly line balancing problem is one of the most studied NP-Hard problems. NP-Hardness leads us to search for a good solution instead of the optimal solution especially for the big-size problems. Meta-heuristic algorithms are the search methods which are developed to find good solutions to the big-size and combinatorial problems. In this study, it is aimed at solving the multi-objective multi-model assembly line balancing problem of a company. A meta-heuristic algorithm is developed to solve the deterministic assembly line balancing problems. The algorithm developed is tested using the test problems in the literature and the the real life problem of the company as well. The results are analyzed and found to be promising and a solution is proposed for the firm.

APA, Harvard, Vancouver, ISO, and other styles

39

Rahman, MD Mashuqur. "In-Line Rheological Measurements of Cement Based Grouts Using the UVP-PD Method." Thesis, KTH, Jord- och bergmekanik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33878.

Full text

Abstract:

In underground construction grouting is performed to seal tunnels and caverns against excessive water inflow or to reduce the lowering of the ground water table. The rheological properties, such as viscosity and yield stress, of the used grouts play a fundamental role in grouting. No method has been developed yet to measure these properties in-line in the field during grouting. Methods used today are rather primitive and not robust enough for field use and they are mainly performed in order to verify and fulfil stipulated quality criteria. Modern grouting rigs are today equipped with continuous measurement of flow and pressure but instruments for continuous monitoring of rheological properties and their changes with time in the field are still lacking. A relatively new method, known as ‘UVP-PD’, for continuous in-line measurements of the rheological properties of cement grouts, was tested in this work. Standard grouting equipment (UNIGROUT) and flow meter (LOGAC) was used to ensure field conditions. The objective of this work was to determine the feasibility of the ‘UVP-PD’ method for cement based grouts. After performing full scale experimental works, this method was found feasible for measuring the rheological properties of cement based grouts directly in-line.

APA, Harvard, Vancouver, ISO, and other styles

40

Jin, Wenjie. "Numerical Simulation of Wind Turbine Wakes based on Actuator Line Method in NEK5000." Thesis, KTH, Mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118925.

Full text

Abstract:

Nowadays wind turbines are clustered in wind farms and the wake development plays an important role in energy production and blade fatigue load of tubines. The actuator line method is an effective modeling approach that gives improtant wake flow characterstics of a wind turbine. In the last few years, numerous studies have been conducted based on this method using Ellipsys3D, a computational fluid dynamics (CDF) flow solver based on finitie volume approach. However, due to the limited order of accuracy of this solver, it is not capable of a linear stability analysis with small amplitude of perturbation. Therefore, the present work investigates implementing the actuator line ethos into a high order method, Nek5000, a flow solver based on the spectral element approach. The main goal of the present work is to validate the code implementation by comparing the simulations results with the previous Ellipsys3D data. Both 2-D and 3-D Gaussian distribution functions are discussed for the actuator line force distribution. Parametric study is carried out regarding the smoothing parameter ε and the partitioning of the actuator line.

APA, Harvard, Vancouver, ISO, and other styles

41

Reynolds, David L. "VLSI implementation of an efficient method for the computation of line spectral frequencies /." Full text available online, 2004. http://www.lib.rowan.edu/find/theses.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Lee, Chen-Tse, and 李振澤. "Analysis of Cylindrical Transmission Line Using Finite Element Method together with Cylindrical Method of Lines." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/16568892587164116359.

Full text

Abstract:

碩士
華梵大學
電子工程學系碩士班
94
In this thesis, we will combine the finite element method (FEM) and the cylindrical method of line(CMoL) to analyse the cylindrical transmiission line. In this approach, the regions of complex geometric or material structures are modeled by the finite element method. The simple regions or homogeneous lays of structures are analyzed using the CMoL. From the filed solutions calculated using the CMoL, the boundary conditions are constructed. The line and surface integral involved in FEM. This numerical technique would not only retain the characteristic of FEM in simulating complex structures but also can singnificantly reduce the number of unknows. The validation of the proposed method is checked by comparing with the result modeled by FEM or CMoL.

APA, Harvard, Vancouver, ISO, and other styles

43

Gwo-Chyuan, Chiou, and 邱國權. "Sinulation Pulse train Tarnsmission Line Matrix Method." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/25213855696044386267.

Full text

Abstract:

碩士
中正理工學院
電機工程研究所
87
Recently, the application of microwave integrated circuits (MICs) is the trend for the development of tranceiver in microwave communication systems. It has advantages in accuracy, small volume, light weight, low power, and low cost etc. The electromagnetic characteristics in MICs are complicated, and then limit the performance of tranceivers. Usually, it is necessary to have the EM simulation before the implementation of MICs. In this thesis, based on sinusoidal pulse train tarnsmission line matrix (SPT-TLM) method, we adopted the Yee-based expanded node to develop the EM simulation program which can be processed in personal computer. In practical, we analyze the electro-magnetic characteristics of the microstrip line circuits and packaging in MICs with the simulator. The results can be applied in analyzing the S parameter of active and passive devices.

APA, Harvard, Vancouver, ISO, and other styles

44

Lorenz, Petr [Verfasser]. "Transmission line matrix - multipole expansion method / Petr Lorenz." 2007. http://d-nb.info/988204495/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Moradmand, Siamak. "A primitive selection method for unconstrained line structures." Thesis, 1989. http://spectrum.library.concordia.ca/4616/1/ML51360.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Yu, Po-Chien, and 游伯堅. "Applying Line of Balance Method for Cleanroom Construction." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/42054533390433234032.

Full text

Abstract:

碩士
國立臺灣大學
土木工程學研究所
100
High-tech industry plays an important role in Taiwan economy. Recently, the out-put value of the three science parks accounts for more than 15% of GDP. The electronic chips made in Taiwan can be found all over the world. However, the high-tech industry has faced with the threat of low profits, due to the global economy crisis and the intensively competitive international business. The only way to survive is the R&D in the science parks. By using the advanced process and technology, more powerful equipment and high quality plant, Taiwan companys will be able to provide higher-profit stocks to the market than foreign completers. In order to achieve this target, not only the high frequency process regeneration and technology improvement are strongly required, but also the more powerful equipment and faster plant renew and construction speed are necessary. To speed up the construction, high-tech plant construction usually uses fast-track method. The contractors start to construct after the design process starts, and before the process completes. At the same time, sectional construction is also used in the construction process to increase the working faces. When the MEP contractors and civil contractors work at the same time, the project duration is shortened. On the other hand, due to the fast-track method, the project schedule of high-tech plant construction is rough, lacking details. The net diagram of high-tech plant construction only shows the project milestones which cannot be broken down into activities, causing problems in managing project schedules. This study emphasizes on how the characteristics of high-tech plant affect the sectional construction and schedule management of high-tech plant construction. Expert interview, literature review and the history case study are used in this study. The line of balance (LOB) method, along with the spatial features of cleanroom sectional construction, and schedule management concept are used afterwards. To replace a rough schedule linked up by milestones, a linear schedule assembled by a series of spatial activities is obtained by this study.

APA, Harvard, Vancouver, ISO, and other styles

47

Lee, Ssu-Ming, and 李思明. "Researching Double Gate Line for LCD Driving Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/38364383085862819967.

Full text

Abstract:

碩士
元智大學
電機工程學系
99
TFT-LCD is a small size, lighter weight, lower power and no radiation display , etc., In virtue of these characteristics, it is suitable for use in car driving devices, personal portable devices, notebook and large size of the family television. In this thesis, we describe the properties of liquid crystal electro-optical conversion and understand the principle applied to the display technology. Then use programmable timing controller to design variable timing signal to control resolution. It is to be applied to different Array of liquid crystal display panel, and finally we want to implement control signal to a panel of double gate for verify control timing.

APA, Harvard, Vancouver, ISO, and other styles

48

楊佳明. "Face Recognition System using Random Line Sampling Method." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/43169196192962763132.

Full text

Abstract:

碩士
國立中興大學
電機工程學系
89
Real-time face recognition systems based on inoffensive feature extraction techniques have already produced very high identification rates. Although real-time face recognition system has many advantages, real-time face recognition in an unconstrained environment is a difficult task. Many real-time human face recognition systems operate under strict imaging conditions such as controlled illumination, image size, noises, and limited facial expressions. In this thesis, we propose a line-based face recognition algorithm combined with Gabor filters to alleviate the constraints. This algorithm achieves high recognition rates for rotations both in and out of the plane, is robust to sacling, and is computationally efficient. Before the feature vector extraction, we use Gabor filters to enhance the important facial features such as the eyes, the noise, and the mouth. After that, we use a set of random straight lines to extract the feature vector of the face image. Finally, the nearest-neighbor classifier is used to classify the test face image into one of the persons in the database. In our experiment, we use ORL face database to test this line-based face recognition system. Our method achieved an average recognition rate of 99.6 % using 1.784 seconds per view in average.

APA, Harvard, Vancouver, ISO, and other styles

49

Santos, Pedro. "Approximation Methods for Convolution Operators on the Real Line." Doctoral thesis, 1998. https://monarch.qucosa.de/id/qucosa%3A18294.

Full text

Abstract:

This work is concerned with the applicability of several approximation methods (finite section method, Galerkin and collocation methods with maximum defect splines for uniform and non uniform meshes) to operators belonging to the closed subalgebra generated by operators of multiplication bz piecewise continuous functions and convolution operators also with piecewise continuous generating function.

APA, Harvard, Vancouver, ISO, and other styles

50

Lin, Dao-Ming, and 林道皿. "Comparison of Methods for Generating the Line Envelope on a Four-Bar Linkage - Envelope-Theorem Method and Instant-Center Method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/m9wd84.

Full text

Abstract:

碩士
國立清華大學
動力機械工程學系
105
This thesis presents a method-comparison study to evaluate the applicability and the effectiveness of the instant center approach, compared with the conventional envelope theory. Given the same input parameters, two methods yield identical resulting envelopes, which are illustrated analytically and numerically via the case studies. The main aim of this thesis is illustrating the merits of adopting the instant-center approach over the envelope theory. The formulation based on the envelope theory is purely an algebraic arrangement. Expressing an envelope in an explicit form involve differentiation and simultaneous solution of equations describing a family of straight lines, which are burdensome and difficult to operate. Oppositely, using the concept of instant center allows one to locate the common normal which pass through the instant center and at last determine the envelope. This approach offers more intuitive comprehensions about geometric features of a mechanism of interest, comparably simple and efficient. The case studies also have shown an insightfully geometric fact that a second family of straight lines is a straight trajectory orthogonal to a family of straight lines.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Line method'

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