Dissertations / Theses on the topic 'Horizontal field'
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Leighton, Feifei Zhang. "Numerical modelling of shallow flows with horizontal density variation." Thesis, University of Oxford, 2005. http://ora.ox.ac.uk/objects/uuid:2ea7400f-9b2c-4052-961e-84446f501822.
Full textVeenhuis, Robert S. "Matched field processing in shallow water using a small aperture horizontal line array." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA293673.
Full text"December 1994." Thesis advisor(s): James H. Wilson. Includes bibliographical references. Also available on microform AND online.
Budihardjo, Arifin 1968. "Near-zone electric field computation of a horizontal semi-infinite wire above earth." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278358.
Full textJUNIOR, ROBERTO DA FONSECA. "INSTANTANEOUS LIQUID VELOCITY FIELD MEASUREMENTS IN TWO-PHASE INTERMITTENT FLOW THROUGH HORIZONTAL AND INCLINED PIPES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15406@1.
Full textinstantaneous liquid velocity fields at the film, nose and tail regions of slugs in horizontal and inclined two phase flow. To this end, a combination of three nonintrusive optical techniques was employed. Two-dimensional particle image velocimetry (PIV) was used to measure the instantaneous liquid velocity field at a meridional plane of the horizontal pipe test section, while a synchronized pulsed back lighting, provided by a matrix of red LED s, illuminated the bubble contours thereby enhancing contrast of the interfaces (Pulsed Shadow Technique - PST). A laser-induced fluorescence technique (LIF) was employed to separate the strong reflections coming from the gas-liquid interfaces produced by the green PIV laser, The tests were conducted on a specially built transparent pipe test section, using air and water as the working fluids. The velocity fields were obtained for flow regimes where the slugs were lightly aerated. The velocity field results in the nose, tail and film regions revealed valuable detailed information that helped to better understand the physics of the flow, besides contributing to the formation of a data bank for supporting the development of two-phase, horizontal slug flow simulations. The work conducted also provided statistical information on the main global variables that characterize the flow, such as, speed and length of gas bubbles and liquid slugs, and the frequency of passage of these structures.
Rodrigues, Lázaro Luiz Fratoni. "Transmissão vertical e horizontal de parasitas usando autômatos celulares probabilísticos." Universidade Federal da Paraíba, 2011. http://tede.biblioteca.ufpb.br:8080/handle/tede/5782.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
wide range of pathogens are transmitted by a combination of horizontal and vertical transmission; among these are microsporodians, helminths, bacteria and viruses of plants and animals, including important human pathogens such as HIV, HTLV-1, cytomegalovirus, several hepatitis viruses and herpes simplex [Proc. R. Soc. Lond. B 260: 321-327]. In this work, the vertical parasite spreading from parent to offspring and horizontal transmission through infection in a population of moving individuals are discussed using a probabilistic cellular automata implemented on a square lattice. In our model, we generalize the automata proposed in [J. Phys. A : Math. Gen. 27: 1585-1597] to include the vertical transmission. The local rule consists of two subrules: the first one, applied synchronously, models infection, birth and death processes; the second, applied sequentially, describes the motion of individuals. In this model, endemic states may occur (susceptible and infected individuals coexisting) or a disease-free state (without infected). It is worth mentionins that a state in which the entire population becomes infective is possible in the case of perfect vertical transmission, i.e. infected parents give birth only to infected offspring. Moreover, the stability of these states may be analised using a mean-field approximation or grafically verified from the numerical simulations.
Uma ampla faixa de patógenos são propagados por uma combinação de transmissão horizontal e vertical, dentre os quais podemos destacar: microesporídeos, helmintos, bactérias, fungos e vírus de plantas e animais, incluindo importantes microorganismos parasitas de humanos como o HIV, HTLV-1, cytomegalovírus, vários tipos de hepatite e herpes simples [Proc. R. Soc. Lond. B 260: 321-327 (1995)]. Neste trabalho, a transmissão vertical (infecção do genitor para os filhos) e a transmissão horizontal (infecção por contágio) numa população de indivíduos em movimento são discutidos usando um autômato celular probabilístico implementado numa rede quadrada. Em tal modelo, generalizamos o autômato proposto em [J. Phys. A : Math. Gen. 27: 1585-1597 (1994)] para incluir a transmissão vertical. A regra local consiste de duas subregras: a primeira modela de maneira sincronizada os nascimentos, as mortes e as infecções; já a segunda, aplicada sequencialmente, descreve o movimento dos indivíduos. Neste modelo é possível um estado endêmico (suscetíveis coexistindo com infectados) ou um estado livre de doenças (sem infectados). Salienta-se que um estado em que toda a população torna-se infectada é possível no caso de transmissão vertical perfeita, i.e. pais infectados possuem apenas descendentes infectados. Inclusive, a estabilidade destes estados pode ser analizada na aproximação de campo médio para este modelo, ou verificada através dos gráficos dos resultados das simulações numéricas.
Dong, Danan. "The horizontal velocity field in southern California from a combination of terrestrial and space-geodetic data." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/52979.
Full textAchinivu, Ochi I. "Field application of an interpretation method of downhole temperature and pressure data for detecting water entry in horizontal/highly inclined gas wells." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2355.
Full textCarrera, Sandra Garcés. "Virulence of Mayetiola destructor (Say) field populations in the Great Plains and levanase/inulase-like genes in the Hessian fly genome." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16873.
Full textDepartment of Entomology
Ming-Shun Chen
C. Michael Smith
The Hessian fly, Mayetiola destructor (Say), is a major pest of wheat, and is controlled mainly through deploying fly-resistant wheat cultivars. This study investigated five M. destructor populations collected from Texas, Louisiana, and Oklahoma, where infestation by Hessian fly has been high in recent years. Eight resistance genes including H12, H13, H17, H18, H22, H25, H26, and Hdic, were found to be highly effective against all tested M. destructor populations in this region, conferring resistance to 80% or more of plants containing one of these resistant genes. The frequency of biotypes virulent to resistant genes ranged from 0 to 45%. A logistic regression model was established to predict biotype frequencies based on the correlation between the percentages of susceptible plants obtained in a virulence test. In addition to the virulence test, the log-odds of virulent biotype frequencies were determined by a traditional approach to predict the logistic regression model. Characterization of a bacterial artificial chromosome (BAC) clone identified a gene encoding a protein with sequence similarity to bacterial levanases. Blast searching with the levanase-like protein identified 14 levanase/inulase-like genes or gene fragments. In this study, we determined the expression levels of these genes in different developmental stages and different tissues of 3-d old larvae of M. destructor. Sequence analysis revealed that six genes encode full length proteins, three were truncated at the 5’ end, and five truncated at the 3’ end. Sequences of putative proteins showed approximately 42% similarities to bacterial levanases or inulases, and 36% similarity to fungal levanases or inulases. No sequence similarities were found with any known animal or plant proteins. Comparative analysis of sequences among 14 levanase/inulase-like genes revealed that positions for intron/exon boundaries are conserved among different genes even though the length of each intron and exon varied among different genes. The expression patterns of the levanase/inulase-like genes were different among developmental stages and larval tissues of M. destructor. Interestingly, three genes presented alternative splicing bands in different developmental stages, and two genes exhibited splicing bands in different tissues of 3 d old M. destructor. This study would be useful for future studies of the characterization and function of levanase/inulase-like genes of these enzymes in plant-insect interactions.
Rivero, Diaz Jose Antonio. "Experimental studies of steam and steam-propane injection using a novel smart horizontal producer to enhance oil production in the San Ardo field." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5753.
Full textMcPhillips, Kenneth J. "Far field shallow water horizontal wave number estimation given a linear towed array using fast maximum likelihood, matrix pencil, and subspace fitting techniques /." View online ; access limited to URI, 2007. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3276997.
Full textHard, Louise. "How is leadership understood and enacted within the field of early childhood education and care." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16213/1/Louise_Hard_Thesis.pdf.
Full textHard, Louise. "How is leadership understood and enacted within the field of early childhood education and care." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16213/.
Full textPark, YoongSoo. "The development and field testing of an instrument for measuring citizens' attitudes toward public school funding in terms of equity, adequacy, and accountability." Ohio : Ohio University, 2010. http://www.ohiolink.edu/etd/view.cgi?ohiou1268147159.
Full textFaro, Vitor Pereira. "Carregamento lateral em fundações profundas associadas a solos tratados : concepção, provas de carga e diretrizes de projeto." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/100167.
Full textCurrent engineering works typically envolve large structural units whose design and implementation should be closely observed. Due to the complexity of the loads and structural needs, the design methodologies should comply specific requirements. The geotechnical variability combined with the loads diversity imposes the need to develop methodologies applied specifically to projects whose foundations will be laterally loaded, like bridges, harbors, transmission line towers, onshore and offshore wind turbines, among others. There are several methods reported in geotechnical literature to design piles that will be subjected to horizontal loads. However, none of these methods consider a solution based on a simple soil reinforcement using cementation techniques, in a superficial layer, radial to pile. The main goal of this research is to study the behavior of deep foundations with a reinforced soil system, subjected to lateral loads. Design guidelines are presented, leading to a model that predicts the ultimate load capacity of deep foundations subjected to these types of efforts. Field tests and tridimensional numerical simulations using the Finite Element Method were performed in order to achieve a better understanding of the behaviour of laterally loaded piles. Considering the pile diameter (D) and its depth (L), different L/D ratio were defined, corresponding to rigid and flexible piles. Using these L/D ratios, in both natural and reinforced soils, numerical and field tests were performed to provide experimental evidences of its behaviour. Numerical tests consisted in a parametric analysis where different geometric (pile and treated soil) and geotechnical parameters, necessaries to the Mohr-Coulomb model, have been modified. The proposed prediction model is based on the analysis of the numerical simulations results, using ABAQUS® software, validated with the field tests. It is important to point that in this study only geotechnical rupture is considered. Therefore it is assumed that piles have elastic behaviour. Has been concluded that the use of a superficial treated layer, radial to pile, considerably improves the system performance, increasing the lateral load capacity and decreasing their deformation, showing that this technique could be a promising solution to deep foundations subjected to horizontal loads.
Ozkan, Erdal. "Performance of horizontal wells /." Access abstract and link to full text, 1988. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/8825498.
Full textKracík, Petr. "Hodnocení přestupu tepla na skrápěném trubkovém svazku." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-240776.
Full textDavenport, Christopher M. "Neural circuitry of retinal receptive fields in primate /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/10652.
Full textKim, Yoon Duk. "Transverse Stiffener Requirements in Straight and Horizontally Curved Steel I-Girders." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4802.
Full textOrr, Andrew McLean White. "Computational techniques for evaluating extremely low frequency electromagnetic fields produced by a horizontal electric dipole in seawater." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326222.
Full textPlucinski, Matthew Paul Mathematics & Statistics Australian Defence Force Academy UNSW. "The investigation of factors governing ignition and development of fires in heathland vegetation." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Mathematics and Statistics, 2003. http://handle.unsw.edu.au/1959.4/38702.
Full textDavoust, Laurent. "Convection naturelle MHD dans une cavité horizontale élancée." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0139.
Full textГедзик, Н. М. "Удосконалення технології підвищення газовилучення з родовищ із низькопроникними теригенними колекторами." Thesis, Івано-Франківський національний технічний університет нафти і газу, 2016. http://elar.nung.edu.ua/handle/123456789/4779.
Full textДиссертация посвящена совершенствованию технологии увеличения газоотдачи и текущих отборов из месторождений природных газов с низкопроницаемыми терригенными коллекторами. По результатам работы впервые экспериментально установлено влияние температуры, давления и проницаемости песчаных пород-коллекторов на способность адсорбировать метан. Получена аналитическая зависимость, которая позволяет оценить количество адсорбированного газа в зависимости от проницаемости коллектора, давления и температуры. Экспериментально определено относительную адсорбционную способность метана, азота и диоксида углерода на поверхности уплотненных песчаников и обоснованы направления повышения коэффициента газоотдачи за счет интенсификации добычи адсорбированного газа путем нагнетания неуглеводородных заместительной агентов. Исследовано влияние давления и метода нагнетания неуглеводородных заместительных агентов на коэффициент конечной газоотдачи месторождений природных газов с низкопористых низкопроницаемых коллекторами и обоснованно физический смысл процессов, которые при этом проходят. По результатам компьютерного гидродинамического моделирования проведена оценка оптимальных параметров стволов скважин и трещин гидравлического разрыва пласта исходя из их технико-технологической и экономической оптимизации с использованием генетических алгоритмов. Оценено значение чистого дисконтированного денежного дохода в зависимости от параметров скважины, трещин гидравлического разрыва пласта и проницаемости коллектора. Обоснованы рекомендации по бурению горизонтальных скважин в низкопроницаемых коллекторах и проведения в них гидравлического разрыва пласта. После анализа промышленных данных и результатов собственных лабораторных исследований обоснована целесообразность учета адсорбционно-десорбцийних процессов при разработке месторождений природных газов с низкопористыми низкопроницаемыми коллекторами. Экспериментально установлено влияние адсорбционно-десорбцийних процессов на характер кривой сводного пластового давления от накопленной добычи газа. Уточнено уравнение материального баланса для газового месторождения при газовом режиме разработки путем учета адсорбционно-десорбцийних процессов при разработке вертикальными и горизонтальными скважинами на истощение и при нагнетании неуглеводородных заместительной агентов по обоснованным технологиям. На основе полученных уравнений уточнены соответствующие методики прогнозирования технологических показателей разработки. Разработаны уравнения и методики апробированы для условий гипотетического газового месторождения. Проведено сравнение полученных результатов с мировым опытом и сделаны соответствующие выводы. Приведены обобщения и рекомендации по практическому использования и промышленному внедрению предлагаемых технико-технологических решений.
The thesis is devoted to improving the enhanced gas recovery technology and current gas production from the fields with low-permeable terrigenous reservoirs. The paper experimentally established the effect of temperature, pressure and permeability of sand reservoirs on the value of specific volume of adsorbed gas and appropriate empirical relationship was obtained. The relative adsorption of methane, nitrogen and carbon dioxide on the surface of sand packed model was experimentally determined and the directions for enhanced gas recovery factor by gas desorption intensification using non-hydrocarbon displacement agents injection were grounded. The influence of pressure and method of non-hydrocarbon displacement agents injection on ultimate gas recovery factor was determined. As a result of hydrodynamic computer simulation using Eclipse 300 software the optimal parameters of wells profiles and hydraulic fractures were evaluated based on technological and economic criteria. The impact of adsorption-desorption processes on the dynamics of the curve of reduced reservoir pressure from cumulative gas production was experimentally established. The material balance equation under gas drive was specified by taking into account adsorption-desorption processes. On the basis of these equations the calculation methods were specified for predicting the technological parameters of the natural gas fields with low-permeable reservoirs development by vertical and horizontal wells. Obtained results were summarized and recommendations for practical implementation and commercialization of elaborated technical and technological solutions were suggested.
Predrag, Pecev. "Развој алгоритма и система за дедуктивну предикцију и анализу кретања кошаркашких судија." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104240&source=NDLTD&language=en.
Full textDoktorska disertacija pripada oblasti informacionih sistema, sa jasnim akcentom na upotrebu neuronskih mreža za rešavanje problema višestrukih zavisnih vremenskih serija koji je u ovom doktoratu definisan.Osnovni cilj disertacije je kreiranje sistema u formi edukativnog softvera putem kojeg će se obučavati mlade košarkaške sudijeJedan od ključih elemenata ovog doktorata jeste simulacija horizontalnog vidnog polja na osnovu kojeg se utvrđuje da li je rezonovano kretanje košarkaških sudija bilo adekvatno ili nije. Stoga razvijeni softver poseduje spomenutu edukativnu primenu.Kako bi se realizovao spomenuti softver sprovedeno je istraživanje koje je obuhvatilo obučavanje velikog broja tradicionalnih višeslojnih perceptrona kao i formiranje posebne LTR – MDTS strukture neuronske mreže za koju se smatra da je pogodna za rešavanje postojećeg problema. Za realizaciju simulacije horizontalnog vidnog polja razmatrano je više algoritama iz oblasti računarske grafike a Sweep and Prune algoritam je parcijalno pružio osnovu za razvijeni i trenutno implementirani algoritam.
Doctoral dissertation belongs to the field of information systems, with a clear emphasis on the use of neural networks for solving the problem of multiple dependent time series, which is defined in this doctorate. The main objective of the thesis is to create a system in the form of educational software that will be used druring the training of young basketball referees.One of the key elements of this doctorate is a simulation of a horizontal field of vision on the basis of which it is determined whether the movement of reasoned basketball referees was adequate or not. Therefore developed software has aforementioned educational use. In order to realize the aforementioned software, a research was conducted that included training of a large number of traditional multilayer perceptron neural networks and the formation of special LTR - MDTS neural network structure which is considered to be suitable for solving the presented problem. For the realization of the simulation of the horizontal field of vision a large number of algorithms in the field of computer graphis was considered and Sweep and Prune algorithm partially provided the basis for the developed and currently implemented algorithm.
Almeida, Luciane Infantini da Rosa. "Razões, sentimentos e projetos profissionais: experiência dos vestibulandosas (Vitória, ES, 2009 - 2010)." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2755.
Full textProvide clarity to the feelings and reasons that emerge from the experiences of the students in Vitória-ES, between 2009-2010, and what move them toward their professional projects is the goal of this work. The notion of design used here (Velho, 1999) differs from the classical liberal understanding of human being, autonomous, free and unique, responsible for their successes and failures, underlie to studies on "career choice". The proposed idea is that the field experiences of the subjects mark their professional projects, but their deliberate conduct, not necessarily rational, expose certain life expectations, whatever is the social position of these individuals. To test these expectations, these subjects were seen in their social relations on the intersections of class, gender, ethnicity, generations, etc. It was recognized also that the reasons and feelings (WILLIAMS, 1969) also forge professional projects of subjects under different social conditions and in spite of them. Considering that these projects carry human manifestations not always visible, often covered, the metaphor of "rhizome" (DELEUZE; GUATTARI, 2004) was useful as methodology. Evidences (GINZBURG, 2007) suggested research paths and some of the meanings attributed by those subject to these projects could be detected. The prospect of long-term historical and multiple times chaired the examination of trajectories of a selected group of subjects studied between the years 2009-2010, which favored the perception of historical continuities, but also the occurrence of certain changes in social trends. Two pre-university courses, one public and one private, in Vitória, ES, at this juncture, showed a bit of a plurality of different expectations of young people - poor, middle and upper classes, men and women, whites, blacks and browns, younger and older in relation to high school - present in their professional projects. Reasons and feelings that move them and that move is not always considered in studies on the subject, were exposed. Contributions of Elias (1990), Williams (1969), Bourdieu (2003, 2009), E. P. Thompson (2002), Löwy (1990), among others, supported evidences that the relation between individual and society, always plural and complex, express only parts of their civilizing senses. To reduce uncertainties, it was used macro and micro data (Revel, 1998). Interviews with these teenagers and advisers, observations from group dynamics and also examination of official publications, periodicals to disseminate material on vestibular, between 2009-2010, were located a tract of analytical scales difficult to exercise. Apart from relations of class, gender, skin color, generation, etc., is possible to conclude that these subjects, for reasons and various feelings, with their professional projects, move are not from their social origin, but all of them, in their new experiences and different ways, also prepare themselves to act on the senses civilizing of his time.
Capri, Marcio André Lopes. "Aspectos não perturbativos das teorias de Yang-Mills no calibre abeliano maximal." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1373.
Full textNeste tese, estudamos os efeitos não perturbativos associados à presença do horizonte de Gribov e à condensação de operadores locais de dimensão dois, numa teoria de Yang-Mills euclidiana em SU(2), quantizada no calibre abeliano maximal. Estes efeitos são introduzidos de modo a preservar as propriedades de renormalizabilidade e localidade da teoria, e refletem-se diretamente no comportamento dos propagadores. A comparação com os dados da rede indicam um bom acordo qualitativo.
In this, we study the nonperturbative effects associated to the presence of the horizon and to the condensation of local dimension two operators in an Eucledean SU(2)Yang-Mills theory quantized in the maximal Abelian gauge. Such effects are introduced in a way to preserve the properties of renormalizability and locality of the theory. The comparison with the lattice data indicates a good qualitative agreement.
Kaulicke, Peter. "Nota editorial." Pontificia Universidad Católica del Perú, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/113449.
Full textWANG, YU-FAN, and 王昱凡. "Accuracy Analysis and Application of Taiwan Horizontal Velocity Field." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/f7rm6e.
Full text國立臺北大學
不動產與城鄉環境學系
106
If the surveying results and coordinate information provided by the National Geodetic Datum can maintain long-term stability and accuracy, it will be able to effectively provide reference coordinates with certain accuracy for surveying points in various regions. However, the 1997 National Geodetic Datum which currently used in Taiwan (TWD97@2010) is still a static geodetic datum because its point coordinates does not have velocity values. Therefore, under the influence of complex surface structure and active plate movement, the accuracy of Taiwan geodetic datum will be more difficult to maintain. Since the concept of the semi-dynamic datum was put forward, Taiwan has used the GPS satellite observation continuous station and mobile station data over the years to successively calculate the speed field model required for semi-dynamic datum in Taiwan (currently completed horizontally). Therefore, this study will first verify the accuracy of the horizontal speed field in Taiwan region, and analyze the differences between measured coordinate values of Taiwan basic control points in the years 2013, 2016, and 2017 years and coordinate values based on the horizontal speed field to evaluate the feasibility of the horizontal speed field applying in Taiwan. Secondly, it proposes suggestions for the basic survey and measurement of surveying and mapping in various regions of Taiwan to serve as a reference for information maintenance, renewal, and application of basic control points in all regions.
HUNG, CHIEN-CHIA, and 洪健嘉. "Study on the Renewed Timing of Horizontal Velocity Field in Taiwan." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6949xc.
Full text國立臺北大學
不動產與城鄉環境學系
107
Taiwan is located at the boundary of plates, and the relative movement of plates causes the changes of surface points with time. In the past, the geodetic datum adopted the method of static datum, and comprehensive inspection of control points was adopted in the update and maintenance, which not only consumed a lot of time and labor costs, but also caused the inconvenience in cadastral survey by different datum. At present, Japan, the United States and New Zealand adopt the semi-dynamic datum of the static datum and the surface deformation model (including velocity model and coseismic model), and apply the model to modify the coordinates to the reference time to consider the surface deformation and improve the accuracy of the geodetic datum. Most of the past studies on the semi-dynamic datum in Taiwan only used one horizontal velocity field, and did not consider that the velocity field might change with the occurrence of seismic events or the passage of time. So how to find the timing and frequency of velocity field updating is an important task to improve the accuracy of deformation model. This study through the time series of GPS continuous station fitting, with major earthquake event time points as the reference, piecewise fitting for velocity, found that the time of velocity change point in the time of the major seismic event, and consistent with seismic event, mobile station fitting in the same way, getting the 12 periods of velocity field in Taiwan. Based on the velocity results of the coordinate time series fitting, it is not suitable to select the test stations to be included in the model establishment. It can be known that too short accumulation of the data of the test stations will lead to a large standard deviation of the velocity fitting. Therefore, the stability of the velocity fitting is tested in different data periods in this study. In the future establishment of velocity field model, the overall accumulation of long-term stable station coordinate data should be more than 3 years, and the station coordinate data less than 1 year should pay attention to the instability of velocity value estimation. Then, using the horizontal velocity field of 376 continuous stations and 782 mobile stations for 12 periods, the horizontal velocity grid model was established by using the Kriging method, and the difference between the actual observation and model estimation values was compared by using 19 checking stations. Taking 20 mm as the threshold value of velocity field updating, which is the most rigorous in the practical application of Taiwan’s current geodetic datum. The average service life of the horizontal velocity grid model established in Taiwan is 27 years, 18 years in the southwest, 5 years in the east, and 2 years in the past static datum. Therefore, in the future, the grid of horizontal velocity can be updated according to different frequencies and regions, and the time point of velocity change is consistent with the occurrence period of major earthquake events, so the updating of horizontal velocity field can be tracked back to the time of major earthquake.
Yeh, Chi-Shian, and 葉祈賢. "Density current impact on a horizontal cylinder:Experimental flow field and force analysis." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/11445762334251555249.
Full text國立臺灣大學
土木工程學研究所
100
The aim of this thesis is to analysis the flow field and the force as the density current passing a horizontal cylinder. Where submarine cables and pipelines across submarine canyons, there is a danger that they will be damaged or destroyed by turbidity currents. To model this risk, the present thesis reports simplified experiments in which density currents impact a horizontal cylinder. The aim of the experiments is to simultaneously measure the force and flow field, and to relate one to the other. Laser-illuminated imaging is used to measure the unsteady velocity and density fields. On the other hand, a strain gauge is used to measure the associated force exerted on the cylinder. Inverse modeling is preformed to evaluate the pressure field and force from the velocity and density measurements, using the pressure Poisson equation. The modeled force was then compared to data retrieved from the strain gauge to evaluate the accuracy.
Barlee, R. Matthew S. (Richard Matthew Scott). "Matched field and matched beam source localization using a bottom moored horizontal array." 2003. http://hdl.handle.net/1828/460.
Full textLee, Chien-Shing, and 李建興. "Investigation of Laminar Film Condensation Heat Transfer on Horizontal Plates and Disks under Magnetic Field Effect." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/bvn96m.
Full text國立成功大學
機械工程學系碩博士班
90
An analysis is conducted to study the two dimensional laminar film condensation heat transfer with the effects of applied magnetic field or downward flowing vapors onto a horizontal wavy plate or disk. In the presence of magnetic field, the electrically conducting film will be governed by the elemental force-Lorentz force. The classical condensation model of Nusselt-Rohsenow’s analysis combined with the set of magnetohydrodynamic equations is utilized to treat the liquid film layer. Another case for the free and forced convection film condensation with pure saturated vapor, the Shekriladze and Gomelauri’s shear stress model is adopted appropriately for the liquid-vapor interfacial condition. Both cases are investigated with some general assumptions like liquid inertia and energy convection terms neglected. An essential part of the present analysis is that the boundary condition at the plate edge is established by the application of Minimum mechanical energy principle from the open channel flow theory. To obtain the critical condensate layer thickness, the mass and energy equations must satisfy the conservation balance at the interface. An adequate implicit cubic spline scheme is employed for the numerical solution of the governing equations.To sum up the physical phenomena, results of the complete model were discussed in dimensionless form, including several presented parameters like Hartmann number, Rayleigh number, Jacob number and Reynolds number. According to the numerical results, the flow momentum will be retarded, but the stability and the heat transfer distribution will be increased and normalized due to the externally applied magnetic field. For film condensation of downward flowing vapor, it is found that as the vapor velocity is increasing, the mean heat transfer coefficient is changing from the free convection region into the forced convection region through a transition zone. As for the influence of wavy surface effect on the mean heat transfer coefficient, the results shows that if the total waviness number is odd, the heat transfer characteristics will be proportional to the waviness amplitude.
Chang, Pei-Chen, and 張珮真. "Study on the characteristics of flow field around bubble in a fully developed horizontal pipe flow." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/69684926469201064213.
Full text國立中興大學
土木工程學系所
100
The presence of bubbles in pipeline is thought to be one of the reasons to cause hydraulic electrical and mechanical facility systems to lose their efficiency. From previous researches, the bubble reduces the effective pipe cross section, which results in a reduction in pipe capacity. The efficiency and service life of pumps and turbines were reduced and shortened consequently. It may even create the interruption of the flow field within blowout phenomenon. As a result, the presence of a bubble in the pipeline is anticipated to create potential hazards. This thesis mainly studied the characteristics of flow field around the bubble in a fully-developed horizontal pipe flow. Experiments for different bubble volumes with a single diameter in the horizontal fully-developed turbulent pipe flow were conducted. Flow visualization techniques and high time-resolved PIV system were used to carry out investigations and measurements. The observation windows of the flow field include the areas surrounding the bubble. Velocity and vorticity fields were both analyzed. The results show that the shape and volume of a bubble highly affect the flow field surrounding. Since the bubble surface is slippery, velocity vector exists on the surface of a bubble. As a result, the reverse flow in the end of a long-flat bubble wouldn’t affect the velocity on the bubble surface. The flow field around a bubble is not merely affected by the bubble surface velocity; it also shows a dynamic and irregular nature.
Jafar, Farial A. "Flow fields and heat transfer of liquid falling film on horizontal cylinders." Thesis, 2011. https://vuir.vu.edu.au/19367/.
Full textHsu, Chun-Yu, and 許鈞毓. "Investigation on Particle Transport Phenomena in Indium-Tin-Oxide Doped LC Cells Biased by Horizontal Electric Field." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/523qvu.
Full textZhu, Tai Jie, and 朱泰階. "Effects of uniform cross-flow field on the convection in between differentially heated infinite horizontal parallel plates." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/21456293006539405378.
Full textSchmidtmann, G., Andrew J. Logan, Graeme J. Kennedy, G. E. Gordon, and G. Loffler. "Distinct lower visual field preference for object shape." 2015. http://hdl.handle.net/10454/9896.
Full textHumans manipulate objects chiefly within their lower visual field, a consequence of upright posture and the anatomical position of hands and arms.This study tested the hypothesis of enhanced sensitivity to a range of stimuli within the lower visual field. Following current models of hierarchical processing within the ventral steam, discrimination sensitivity was measured for orientation, curvature, shape (radial frequency patterns), and faces at various para-central locations (horizontal, vertical, and main diagonal meridians) and eccentricities (5° and 10°). Peripheral sensitivity was isotropic for orientation and curvature. By contrast, observers were significantly better at discriminating shapes throughout the lower visual field compared to elsewhere. For faces, however, peak sensitivity was found in the left visual field, corresponding to the right hemispheric localization of human face processing. Presenting head outlines without any internal features (e.g., eyes, mouth) recovered the lower visual field advantage found for simple shapes. A lower visual field preference for the shape of an object, which is absent for more localized information (orientation and curvature) but also for more complex objects (faces), is inconsistent with a strictly feed-forward model and poses a challenge for multistage models of object perception. The distinct lower visual field preference for contour shapes is, however, consistent with an asymmetry at intermediate stages of visual processing, which may play a key role in representing object characteristics that are particularly relevant to visually guided actions.
Chang, Chun-Min, and 張中明. "A Numerical Study of the Turbulent Flow Field from Confined Five Jets Impinge on a Horizontal Moving Plate." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/05054719421039204963.
Full text逢甲大學
機械工程研究所
86
The purpose of this paper is to simulate the two dimensional five jets impinging in a confined channels by numerical study. Multiple turbulent jets flow problem is found in many practical applications, e.g., annealing of metal and glass, drying of paper and textiles or other thin films, turbine blade cooling, as well as in the secondary cooling in continuous coating of steels. The properties, such as pressure, velocity, turbulent kinetic energy, dissipation rate of the turbulent energy, and temperature distributions on the flowfield will be calculated by the PHOENICS software. The k-e two-equation turbulence model and the control-volume integration formula for finite difference and SIMPLEST algorithm are employed to simulate the two dimensional, incompressible, rectangular five- impinging-jet on a horizontal moving flat plate. The effect of the high between nozzles and ground plate, the nozzles pitch, the horizontal velocity of the impinging plate, the inlet velocity of the nozzles on the flowfield structure will be studied one by one.From the calculated results, the aspect ratio affects the flowfield strongly. For a small aspect ration the recirculation zones shrunk, and enhances the static pressure and the Nusselt number over the entireimpingement surface. The center jet behaves like a single jet, and the walljet decreases the length of the potential core and deflects the other jets. As expected, increase of the jet Renolds number also enhances theNusselt number, the turbulent kinetic energy, and the dissipation rate of theturbulent energy. The case of jets impingement on a moving surface is different from that of jet impingement on a stationary surface. The flowfield structure near the ground surface is strongly affected when the impingement surface is moving. For a slow moving impingement plate, the jets characteristics become similar to those of jets impinging on a stationary surface.
Miller, Nathan. "Increasing Well Productivity in Gas Condensate Wells in Qatar's North Field." Thesis, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7356.
Full textHwang, Jongsoo. "Gas injection techniques for condensate recovery and remediation of liquid banking in gas-condensate reservoirs." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3558.
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Jeans, Rhiannon. "Form perception and neural feedback: insights from V1 and V2." Thesis, 2014. http://hdl.handle.net/1885/12731.
Full textSwytink-Binnema, Nigel. "Digital Tuft Flow Visualisation of Wind Turbine Blade Stall." Thesis, 2014. http://hdl.handle.net/10012/8459.
Full textSu, Yuan-Te, and 蘇芫德. "Horizontal two-dimensional bed-load grain and water surface velocity fields in dam breach experiment." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/49359604400294478518.
Full text國立臺灣大學
土木工程學研究所
103
Dam breaching consists of water flow and sediment transport. The connections between water and bed-load velocity and dam breach topography changes in downstream are the purpose in this study. Previous researches are devoted to observe dam breach phenomenon from side view. From top view, the flow field changed by terrain and the surface flow can be observed. A simplified laboratory experiment is conducted to obtain horizontal two dimensional velocity fields. In order to compare water surface and bed-load velocity, we use two different color and density particles to record water and bed-load motion synchronized. The particle tracking velocimetry (PTV) method is used to analyze velocity fields. The topography is acquired as Digital Elevation Model (DEM) using the software Photoscan, Agisoft. According to the DEM, the changing of topography can be discussed. The flow field can be projected to topography as 3 dimensional flow field. Using this approach, we successfully obtain both water surface velocities and bed-load velocities. We found that water surface velocity will affect the bed-load velocity. Besides, the topography have similar pattern to real dam breach events. Finally, the mass conservation can be used to estimate topography changing rate of bed-load if particles velocities are given.
Yeh, Bea-Chun, and 葉碧純. "Three-Dimensional Global Simulation of Thermal and Flow Fields in Horizontal Zone Melting Crystal Growth System." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/01603419275286172676.
Full text國立臺灣大學
化學工程學研究所
92
The hot zone design is the most important task to decide the growth interface, the quality of the crystal and the growth rate. A computational model has been developed to simulate the three-dimensional global thermal and flow fields in horizontal zone melting crystal growth system. The method is so called “ two-level model”, which includes global model and local model. The global model includes the whole crystal growth system. We use the commercial Computational Fluid Dynamics software to combined convection/conduction/surface-to-surface radiation calculations. The melt convection and growth interface calculations in the local model are then made by the an efficient Finite volume method using multigrid acceleration within ampoule, feed, crystal, and melt, with the boundary conditions supplied by the global model simulations. The growth interface shape can be modified in the next global model simulation. The backwards and forwards calculations can be carried out until the thermal fields convergence. We also discuss the effects of gas flow on the global thermal fields and interface shape. Finally, we discuss some influences on the interface shape. To combine the two-level model can be efficient to analyze the global thermal fields and interface shape and it is helpful to design the hot zone in crystal growth system.
Huang, Ping-Ray, and 黃品叡. "The μeq Fitting for Mixed Current Model of MOSFETs Considering the Effect of Horizontal and Vertical Electric Fields." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/s57bu9.
Full text國立臺北科技大學
機械工程系機電整合碩士班
106
With the progress of science and technology, the size of MOSFETs continued to shrink in order to allow MOSFETs to have better benefits, and the problems and challenges encountered have come one after another. In particular, drive current has become increasingly difficult to predict. The current of the transistor is considered to drift current. When the drain voltage reaches the saturation voltage, the reverse charge near the drain side in the channel becomes zero. The transistor enters the saturation region, causing the current no longer to increase as the drain voltage increases. But we consider that the diffusion current consists of surface charge density gradient cannot be ignored, and it even dominates the channel current. In this paper, we present a mixed current consisting of drift current and diffusion current. The inversion charge density, the effect of electric field and mobility are different at the different position in the surface channel. To make this model easier, we use the fixed mobility μeq at each position in the channel. The current at each position in the channel is equal in the same situation. We can find the μeq by using the boundary conditions, near the drain and source side. The parameters affecting μeq are the vertical electric field, horizontal electric field and channel length. We can modulate the gate voltage to change the vertical electric field and modulate drain voltage and channel length to change the electric field. This paper explores the current behavior in the linear and saturation regions, including various channel length, vertical and horizontal electric fields. The results are as expected, the reverse charge density gradient at the pinch-off point produce a diffusion current. So that there will still be diffusion current generation even if it almost no reverse charge at the pinch-off point. The reverse charge density gradient increase by the increasing drain voltage and the proportion of the total current also increase, until the drift current is completely replaced. We find how the regular changes influence μeq by modulating the horizontal, vertical electric field and channel length, it can help us to infer the current behavior that has not been measured in the limited data. The parameters that can be modulated in this paper are the channel length, gate voltage and the drain voltage. The current can be accurately simulated by using these three parameters. In the future, more parameters such as the width and the related measurement data can be taken into account, the application range of the current mode can be increased to make the model more complete. By then, IC designers can use our model to get I-V characteristics according to different situations quickly and design circuits more efficiently.
Shives, Michael Robert. "Numerical models for tidal turbine farms." Thesis, 2017. http://hdl.handle.net/1828/8293.
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Hejda, Filip. "Částice a pole v křivých prostoročasech (vybrané problémy)." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-327859.
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