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1
Dawes, J. H. P. "Mode interactions in three-dimensional convection." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598414.
Повний текст джерелаАнотація:
The focus of this thesis is the influence of rotation or a magnetic field on the dynamics of pattern formation by thermal convection in a plane layer (the Rayleigh-Bénard problem). Chapter 1 of the thesis provides a short introduction to the theory of equivalent steady-state and Hopf bifurcations on doubly-periodic lattices in the plane. Known results and new observations for Hopf bifurcations on non-rotating and rotating square lattices are summarised. There is also a detailed presentation of new stability results for the Hopf bifurcation on a square superlattice. In Chapter 2 the effect on convection of an imposed vertical magnetic field is discussed. This leads to a detailed analysis of the simplest three-dimensional Hopf/steady-state mode interaction, where the ratio of the critical wavenumbers for oscillatory and steady convection is 1 : √2. Chapters 3, 4 and 5 contain results on pattern selection in rotating Rayleigh-Bénard convection, specifically for low Prandtl number fields. Calculations in the regime where the onset of convection is oscillatory are performed to determine possible forms of convection at onset. The transition (with increasing Prandtl number) from patterns involving oscillatory rolls to those involving steady rolls is influenced by a second 1 : √2 mode interaction. The resulting amplitude equations contain heteroclinic cycles and bursting behaviour in marked contrast to the magnetoconvection case. Finally, a new asymptotic regime of low Prandtl number and rapid rotation is explored. The relevance of this regime to various sets of experimental results is discussed.
2
Ogawa, Hiroyuki. "Testing the accuracy of a three-dimensional acoustic coupled mode model." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26806.
Повний текст джерела
3
Kosker, Sadik. "Three Dimensional Mixed Mode Fracture Analysis Of Functionally Graded Materials." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608795/index.pdf.
Повний текст джерелаАнотація:
The main objective of this study is to model and analyze a three dimensional inclined semi-elliptic surface crack in a Functionally Graded Material (FGM) coating bonded to a homogeneous substrate with a bond coat. The parametric analyses on FGMs are based upon zirconia-yttria (ZrO2-8wt%-Y2O3) FGM coating bonded to a substrate made of a nickel-based superalloy. It is assumed that there is a nickel-chromium–
aluminum&
#8211
zirconium (NiCrAlY) bond coat between the FGM coating and substrate. Metal-rich, linear variation, ceramic-rich and homogeneous ceramic FGM coating types are considered in the analyses. The inclined semi-elliptic surface crack problem in the FGM coating-bond coat-substrate system is analyzed under transient thermal loading. This problem is modeled and analyzed by utilizing three dimensional finite elements. Strain singularity around the crack front is simulated using collapsed 20 &
#8211
node quarter &
#8211
point brick elements. Three &
#8211
dimensional displacement correlation technique is utilized to extract the mixed mode stress intensity factors around the crack front for different inclination angles of the semi-elliptic surface crack. The energy release rates around the crack front are also calculated by using the evaluated mixed mode stress intensity factors. The results obtained in this study are the peak values of mixed mode stress intensity factors and energy release rates around the crack front for various inclination angles of the semi-elliptic surface crack embedded in the FGM coating of the composite structure subjected to transient thermal loading.
4
潤, 土田, and Jun Tsuchida. "Dimensional reduction method for three-mode three-way data based on canonical covariance analysis." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13056385/?lang=0, 2018. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13056385/?lang=0.
Повний текст джерелаАнотація:
3相3元データとは，対象，変量，条件の3つの有限集合組によって表現されるデータの総称であり，マーケティングリサーチ，心理学，経済学などの様々な分野で観測されるデータである．本論文では，多変量解析手法の一つである正準共分散分析を3相3元データに拡張し，その適用例および既存手法との比較を行った．Three-mode three-way data exist in various research areas, such as psychology and marketing research. We propose new dimensional reduction methods for three-mode three-way data based on canonical covariance analysis in this study. In addition, we include a simulation study and apply the proposed method to real data.
博士(文化情報学)
Doctor of Culture and Information Science
同志社大学
Doshisha University
5
Gneiting, Scott Alexander. "Improved Leaky-Mode Waveguide Spatial Light Modulators for Three Dimensional Displays." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6561.
Повний текст джерелаАнотація:
This thesis improves on the design of the leaky-mode spatial light modulator, LMW-SLM, presented by Dr. Smalley[1]. Improvements include: input coupling gratings, a pulsed laser input, output coupling gratings, and a 3D printed adjustable module for the stabilization of critical alignments. First, input coupling gratings reduce the cost of the LMW-SLM from $500 to around $2, a drop in cost of over two orders of magnitude. This enables multiple modulators to be used in a single display and allows for an inexpensive modular design to be created. Second, a pulsed laser input allows for image creation without the use of a polygon for derotation. Removal of the polygon allows for direct viewing of the LMW-SLM output enabling near-eye and flat panel displays. Third, output coupling gratings allow for bottom exit devices that are essential for thin substrates and flat panel displays. Fourth, the 3D printed module allows for the critical alignments of the LMW-SLM to become permanent. This in turns allows for transportation of the created displays without a trained technician by abstracting away the complexities of the device. The resulting changes simplify hardware, reduce cost, and enable the LMW-SLM to be modularized and the resulting 3D displays to be transportable. These improvements are made possible by the addition of a one new mask step during fabrication, a simple circuit design, and a 3D printed module designed in SOLIDWORKS. Included in this thesis as attachments are the MATLab, Eagle, and SOLIDWORKS files used to create the improved LMW-SLM.
6
Finlayson, Eric F. "Stress Intensity Factor Distributions in Bimaterial Systems - A Three Dimensional Photoelastic Investigation." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36504.
Повний текст джерелаАнотація:
Stress-freezing photoelastic experiments are conducted using two different sets of photoelastic materials to investigate stress intensity behavior near to and coincident with bimaterial interfaces. Homogeneous, bonded homogeneous, and bonded bimaterial single edge-cracked tension specimens are utilized throughout the investigation for comparative purposes. The first series of tests involves machined cracks obliquely inclined to the direction of far field tensile loading. Mixed-mode stress intensity factors are observed and quantified using a simplified analytical algorithm which makes use of experimentally measured data. In this series of tests, the bimaterial specimens consist of a photoelastic material bonded to the same material containing a moderate quantity of aluminum powder (for elastic stiffening purposes). Moderate yet similar increases in stress intensity factors are observed in bonded homogeneous and bonded bimaterial specimens, suggesting the presence of bondline residual stresses (rather than elastic modulus mismatch) as the primary contributing factor. The second series of tests involves the bonding of mutually translucent photoelastic materials whose elastic module differ by a ratio of approximately four to one. Cracks are placed both near and coincident to the bimaterial interfaces. Mode-mixity and increases in stress intensity are found only in bimaterial specimens whose cracks are placed close to the bondline. Using the materials from the first series of tests it is shown that the increases in these near-bondline experiments are due to thermal mismatch properties (incurred during the stress freezing cycles) rather than mechanical mismatch properties.Master of Science
7
Ficici, Ferhan. "Three Dimensional Fracture Analysis Of Fillet Welds." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608351/index.pdf.
Повний текст джерелаАнотація:
The aim of this study is to model three dimensional surface crack problems in fillet welds. It is assumed that weld material has the same material properties with the sheet metals. The surface crack is considered to occur at two regionsone at the weld root and the other at the weld toe. The surface crack is assumed to have a semi &ndash
elliptical crack front profile. The surface crack problem is analyzed under mechanical loading and the models are built up by three dimensional finite elements. Around the crack front, strain singularity is taken into account by using degenerated 20 &ndash
node quarter &ndash
point solid elements. The main results of this work are the stress intensity factors around the crack front for the test specimen model subjected to axial and bending loads.
8
Yentsch, Robert J. "Three-Dimensional Shock-Boundary Layer Interactions in Simulations of HIFiRE-1 and HIFiRE-2." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1384195671.
Повний текст джерела
9
Esmen, Ekrem Alp 1977. "Three-dimensional mixed mode linear elastic fracture mechanics analysis using domain interaction integrals." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28377.
Повний текст джерелаАнотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.Includes bibliographical references (p. 109-111).
Three-dimensional mixed-mode linear elastic fracture mechanics analysis is presented using domain interaction integrals. An out-of-plane sinusoidal crack was analyzed using a commercially available finite element package to extract the stress intensity factors and the J-Integral. The results were then compared with those obtained from crack face relative displacements as a post-processing step. The model has been tested on various geometries and the performance of focused and non-focused meshing algorithms are compared. The behavior of the stress intensity factors under far-field K-load for growing surface roughness in the form of a sinusoidal crack have been modelled as a cosine series.
by Ekrem Alp Esmen.
S.M.
10
Sagos, George A. "A three-dimensional coupled normal mode model for sound propagation in shallow water with irregular bottom bathymetry." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24074.
Повний текст джерела
11
Dimagiba, Richard Raymond N. "Application of the Boundary Element Method to three-dimensional mixed-mode elastoplastic fracture mechanics." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310815.
Повний текст джерела
12
Han, Ki Jin. "Electromagnetic modeling of interconnections in three-dimensional integration." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29642.
Повний текст джерелаАнотація:
Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.Committee Chair: Madhavan Swaminathan; Committee Member: Andrew E. Peterson; Committee Member: Emmanouil M. Tentzeris; Committee Member: Hao-Min Zhou; Committee Member: Saibal Mukhopadhyay. Part of the SMARTech Electronic Thesis and Dissertation Collection.
13
Smith, S. D. "Finite element prediction of creep crack growth in three-dimensional components under mode 1 loading." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376647.
Повний текст джерела
14
Ko, Min Seok. "Numerical simulation of three-dimensional combined convective radiative heat transfer in rectangular channels." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2542.
Повний текст джерела
15
Lagelius, Robin. "Shozo Ohmori’s 'Fancy' : A Third Mode of Awareness." Thesis, Uppsala universitet, Filosofiska institutionen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-393541.
Повний текст джерелаАнотація:
This thesis is an investigation into the phenomenon which Shozo Ohmori (1921-1997) considered “a peculiar manner of awareness”, and to which he attributed the term ‘fancy’. The objective is to achieve an approximate understanding of Ohmori’s theory of ‘fancy’, as it relates to awareness of entities in three-dimensional space, and the extensions mentioned in his only publication in English: “Beyond Hume’s Fancy” (1974). This objective will be realized by asking three questions. The first question is how we are to understand the demarcation of the different phenomena of awareness which Ohmori identifies. The second question that this thesis asks is what applications that the phenomenon ‘fancy’ mentioned in Ohmori’s account have, as Ohmori saw it. Having answered these questions, I will then make an assessment of another salient consideration: how does Ohmori’s employment of the term ‘fancy’ relate to Hume’s employment of the same term (seeing as the name of Ohmori’s article makes such a reference). As we shall see, Ohmori is attempting to identify a more specific phenomenon than the widely discussed issue of thinking about something that is not currently perceivable in our perceptual field. The third and final question that this thesis asks is whether there are any salient issues with Ohmori’s theory of ‘fancy’ and, if so, whether those issues can be resolved. When we are aware of entities in three-dimensional space, we are subject to various mental processes. Our awareness, seemingly, uses different modes of interpretation and orientation. In other words, our ‘point of view’ (which is something that not only pertains to the use of our visual sensory organs) determines both our place and relation towards other entities. One salient issue when considering the notion of awareness is how and by which order awareness emerges. Impressions, as David Hume would call them, seemingly precede our ideas. Sense-data, as Shozo Ohmori phrased it, is unquestionably inseparable from conceptions. Our conceptions, in turn, seem to inform our perceptions with expectations and predictions of how things are. When we perceive an entity, we are ready to make judgements about its being at this moment. When we see the front of a desk, we are ready to claim awareness of said desk-front as part of a desk (which entails the ontology of a desk, namely, being a three-dimensional construction of a particular variety). In everyday situations we simply speak of such an awareness as ‘perception’ when in actuality, all we see (which constitutes the sense-data or content of a perception) is the front of a desk. It seems we cannot regard our awareness of a desk (a three-dimensional entity) as a perception simpliciter. Of course, by having a notion of what a desk is, our awareness is pregnant with a ‘conception’ in the form of an idea that is informing our awareness of said desk. But our conceptual understanding of the notion of something being a desk is not enough to explain what our awareness of a desk-at-this-moment is. At least, that is what Ohmori thought.
16
Radwan, Samir F. "Numerical solution of the three-dimensional boundary layer equations in the inverse mode using finite differences." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/12029.
Повний текст джерела
17
Wang, Feng. "Development of A Fast Converging Hybrid Method for Analyzing Three-Dimensional Doubly Periodic Structures." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376923791.
Повний текст джерела
18
Geng, Twzen-Shang. "Enhancement of the Dynamic Buckling Load and Analysis of Active Constrained Layer Damping with Extension and Shear Mode Piezoceramic Actuators." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27917.
Повний текст джерелаАнотація:
We consider geometric and material nonlinearities when studying numerically, by
the finite element method, transient three-dimensional electroelastic
deformations of a graphite-epoxy square plate sandwiched between two
piezoceramic (PZT) layers. Points on the four edges of the bottom surface
of the plate are restrained from moving vertically. The two opposite edges
of the plate are loaded
by equal in-plane compressive loads that increase linearly
with time and the other two edges are kept traction free. The plate material
is modeled as orthotropic and neoHookean. For the transversely isotropic
PZT the second Piola-Kirchhoff stress tensor and the electric displacement
are expressed as second degree polynomials in the Green-St. Venant strain
tensor and the electric field. Both direct and converse piezoelectric
effects are accounted for in the PZT. The plate is taken to have buckled
when its centroidal deflection equals three times the plate thickness.
The dynamic buckling load for the plate is found to strongly depend upon the
rate of rise of the applied tractions. With the maximum electric field
limited to
1kV/mm, the buckling load is enhanced by 18.3$\%$ when the PZT elements are
activated. For a peak electric field of 30kV/mm, the buckling load
increased by 58.5$\%$. When more than 60$\%$ of the surface area of the top
and the bottom surfaces of the plate are covered by the PZT layers, then
square PZT elements placed symmetrically about the plate centroid provide
a larger enhancement in the buckling load than rectangular shaped or
cross-shaped PZT elements. An increase in the plate thickness relative
to that of the PZT actuators decreases the effectiveness of
the PZT in enhancing the buckling load for the plate.
The finite element code was modified to also analyze, in time domain, transient
deformations of a viscoelastic material for which the second Piola-Kirchhoff
stress tensor is expressed as a linear functional of the strain history of
the Green-St. Venant strain tensor. It was used to analyze
three-dimensional deformations of a thick laminated plate with layers
made of aluminum, a viscoelastic material and a PZT. The following two
arrangements of layers are considered. In one case a central PZT layer
is surrounded on both sides by viscoelastic layers and aluminum layers
are on the outside surfaces. The PZT is poled in the longitudinal
direction and an electric field is applied in the thickness direction.
Thus shearing deformations of the PZT layer are dominant. In the second
arrangement, the aluminum layer is in the middle and the PZT layers are
on the outside. The poling direction and the electric field are in the
thickness direction; thus its extensional deformations are predominant.
Three indices are used to gauge the damping of motion of plate particles,
and the effectiveness of PZT actuators in enhancing this damping. It is
found that the optimum thickness of the viscoelastic layers for maximum
total energy dissipation is the same for each set-up.
Also, the total thickness of the PZT layers which results in the maximum
value of one of these indices of energy dissipation is the same for the
two set-ups. Both arrangements give the largest value of this index
for a plate of aspect ratio 10.
Buckling behavior of a sandwich plate containing a soft core is
also studied. The effects of the ratio of the elastic moduli
of the outer layers to those of the core, and of the core
thickness on the buckling load are analyzed.
The top and the bottom layers are connected by very stiff blocks on
two opposite edges where in-plane compressive time-dependent tractions
are applied.Ph. D.
19
Hawatmeh, Derar Fayez. "Three Dimensional Direct Print Additively Manufactured High-Q Microwave Filters and Embedded Antennas." Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7165.
Повний текст джерелаАнотація:
The need for miniaturized, and high performance microwave devices has focused significant attention onto new fabrication technologies that can simultaneously achieve high performance and low manufacturing complexity. Additive manufacturing (AM) has proven its capability in fabricating high performance, compact and light weight microwave circuits and antennas, as well as the ability to achieve designs that are complicated to fabricate using other manufacturing approaches. Direct print additive manufacturing (DPAM) is an emerging AM process that combines the fused deposition modeling (FDM) of thermoplastics with micro-dispensing of conductive and insulating pastes. DPAM has the potential to jointly combine high performance and low manufacturing complexity, along with the possibility of real-time tuning.
This dissertation aims to leverage the powerful capabilities of DPAM to come-up with new designs and solutions that meet the requirements of rapidly evolving wireless systems and applications. Furthermore, the work in this dissertation provides new techniques and approaches to alleviate the drawbacks and limitations of DPAM fabrication technology. Firstly, the development of 3D packaged antenna, and antenna array are presented along with an analysis of the inherent roughness of 3D printed structures to provide a deeper understanding of the antenna RF performance. The single element presents a new volumetric approach to realizing a 3D half-wave dipole in a packaged format, where it provides the ability to keep a signal distribution network in close proximity to the ground plane, facilitating the implementation of ground connections (e.g. for an active device), mitigating potential surface wave losses, as well as achieving a modest (10.6%) length reduction. In addition, a new approach of implementing conformal antennas using DPAM is presented by printing thin and flexible substrate that can be adhered to 3D structures to facilitate the fabrication and reduce the surface roughness. The array design leverages direct digital manufacturing (DDM) technology to realize a shaped substrate structure that is used to control the array beamwidth. The non-planar substrate allows the element spacing to be changed without affecting the length of the feed network or the distance to the underlying ground plane.
The second part describes the first high-Q capacitively-loaded cavity resonator and filter that is compatible with direct print additive manufacturing. The presented design is a compromise between quality factor, cost and manufacturing complexity and to the best of our knowledge is the highest Q-factor resonator demonstrated to date using DPAM compatible materials and processes. The final version of the single resonator achieves a measured unloaded quality factor of 200-325 over the frequency range from 2.0 to 6.5 GHz. The two pole filter is designed using a coupled-resonator approach to operate at 2.44 GHz with 1.9% fractional bandwidth. The presented design approach simplifies evanescent-mode filter fabrication, eliminating the need for micromachining and vias, and achieving a total weight of 1.97 g. The design is fabricated to provide a proof-of-principle for the high-Q resonator and filter that compromises between performance, cost, size, and complexity. A stacked version of the two-pole filter is presented to provide a novel design for multi-layer embedded applications.
The fabrication is performed using an nScrypt Tabletop 3Dn printer. Acrylonitrile Butadiene Styrene (ABS) (relative permittivity of 2.7 and loss tangent of 0.008) is deposited using fused deposition modeling to form the antenna, array, resonator, and filter structures, and Dupont CB028 silver paste is used to form the conductive traces conductive regions (the paste is dried at 90 °C for 60 minutes, achieving a bulk DC conductivity of 1.5×106 S/m.). A 1064 nm pulsed picosecond Nd:YAG laser is used to laser machine the resonator and filter input and output feedlines.
20
Binhlam, Jacqueline M. "Examination of three-dimensional (3-D) effects on sound propagation through mesoscale features using 3-D coupled mode theory." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23666.
Повний текст джерелаАнотація:
Approved for public release; distribution is unlimitedA study of the three dimensional (3-D) effects of mesoscale variability on underwater sound propagation is conducted by interfacing the Chiu-Ehret 3-D acoustic coupled mode (CM) model with a forecasted sound speed field generated by the Harvard Open Ocean Model (HOOM). This research concentrates on the sensitivity of the acoustic wave field to source depth and location with respect to a core ring in the Gulf Stream system for a 50 Hz sound source. The inclusion of the exact 3-D physics in acoustics modeling requires substantial computer resources. For this reason, it is very desirable to determine when the simpler adiabatic or Nx2-D approximations may be used. To achieve this goal, "exact" 3-D acoustic coupled mode model calculations are compared to results from the adiabatic approximation and the Nx2-D approximation in terms of transmission loss and phases and amplitudes of individual mode modulation envelopes. The results show that the accuracy of the adiabatic and Nx2-D approximations depend strongly on the radial and transverse sound speed gradients along the track and the acoustic quality considered.
21
Challapalli, Adithya. "Loading Mode Dependent Effective Properties of Octet-truss Lattice Structures Using 3D-Printing." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc799547/.
Повний текст джерелаАнотація:
Cellular materials, often called lattice materials, are increasingly receiving attention for their ultralight structures with high specific strength, excellent impact absorption, acoustic insulation, heat dissipation media and compact heat exchangers. In alignment with emerging additive manufacturing (AM) technology, realization of the structural applications of the lattice materials appears to be becoming faster. Considering the direction dependent material properties of the products with AM, by directionally dependent printing resolution, effective moduli of lattice structures appear to be directionally dependent. In this paper, a constitutive model of a lattice structure, which is an octet-truss with a base material having an orthotropic material property considering AM is developed. In a case study, polyjet based 3D printing material having an orthotropic property with a 9% difference in the principal direction provides difference in the axial and shear moduli in the octet-truss by 2.3 and 4.6%. Experimental validation for the effective properties of a 3D printed octet-truss is done for uniaxial tension and compression test. The theoretical value based on the micro-buckling of truss member are used to estimate the failure strength. Modulus value appears a little overestimate compared with the experiment. Finite element (FE) simulations for uniaxial compression and tension of octet-truss lattice materials are conducted. New effective properties for the octet-truss lattice structure are developed considering the observed behavior of the octet-truss structure under macroscopic compression and tension trough simulations.
22
Pham, Thanh Tuong. "Design, Modeling, and Experiment of a Piezoelectric Pressure Sensor based on a Thickness-Shear Mode Crystal Resonator." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984155/.
Повний текст джерелаАнотація:
This thesis presents the design, modeling, and experiment of a novel pressure sensor using a dual-mode AT-cut quartz crystal resonator with beat frequency analysis based temperature compensation technique. The proposed sensor can measure pressure and temperature simultaneously by a single AT-cut quartz resonator. Apart from AT-cut quartz crystal, a newly developed Langasite (LGS) crystal resonator is also considered in the proposed pressure sensor design, since LGS can operate in a higher temperature environment than AT-cut quartz crystal. The pressure sensor is designed using CAD (computer aided design) software and CAE software - COMSOL Multiphysics. Finite element analysis (FEA) of the pressure sensor is performed to analyze the stress- strain of the sensor's mechanical structure. A 3D printing prototype of the sensor is fabricated and the proposed sensing principle is verified using a force-frequency analysis apparatus. Next to the 3D printing model verification, the pressure sensor with stainless steel housing has been fabricated with inbuilt crystal oscillator circuit. The oscillator circuit is used to excite the piezo crystal resonator at its fundamental vibrational mode and give the frequency as an output signal. Based on the FEA and experimental results, it has been concluded that the maximum pressure that the sensor can measure is 45 (psi). The pressure test results performed on the stainless steel product shows a highly linear relationship between the input (pressure) and the output (frequency).
23
Дзюра, Олена Юріївна. "Система обробки медичних 3D зображень для виявлення асиметрії". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/35956.
Повний текст джерелаАнотація:
Обсяг пояснювальної записки 52 сторінки, міститься 24 ілюстрацій, 12 таблиць. Загалом опрацьовано 33 джерела.
Актуальність роботи пов’язана із задачею удосконалення технології діагностичного виявлення дефектів (патологій) скелету в щелепо-лицевій хірургії та технології виготовлення відповідних штучних елементів для імплантації з використанням імітаційного комп’ютерного моделювання біологічних об’єктів.
Мета: побудова комп’ютерної системи для автоматичного виявлення та візуалізації асиметрії 3-вимірних об’єктів шляхом їх порівняння зі своїм дзеркальним відображенням відносно оптимальним чином побудованих осей симетрії.
Для досягнення мети були сформульовані наступні задачі:
1. Реалізація 3-вимірних адаптивних алгоритмів фільтрації 3D-об’єктів для виділення асиметричних фрагментів різних розмірів та деталізації відповідно до діагностичних завдань.
2. Розробка та програмна реалізація алгоритму побудови осей симетрії об’єкту для дзеркального відображення.
3. Розробка алгоритмів та відповідних програмних модулів для реалізації порівняння патологічної частини досліджуваного об’єкта з дзеркально відображеною здоровою його частиною та візуалізації відмінностей при 3-D реконструкції об’єкту.
Основні результати: проаналізовано літературу, яка стосується обробки цифрових зображень, розроблено та реалізовано алгоритм побудови осей симетрії, розроблено програмні модулі для реалізації виявлення асиметрії.The volume of the explanatory note 52 page, contains 24 illustrations, 12 tables. In general, 33 sources are processed. The urgency of the work is related to the task of improving the technology of diagnostic detection of defects (pathologies) of the skeleton in maxillofacial surgery and the technology of manufacturing appropriate artificial elements for implantation using simulation computer modeling of biological objects. Objective: to build a computer system to automatically detect and visualize the asymmetry of 3-dimensional objects by comparing them with their mirror image of relatively optimally constructed axes of symmetry. To achieve this goal, the following tasks were formulated: 1. Implementation of 3-dimensional adaptive algorithms for filtering 3D objects to select asymmetric fragments of different sizes and detailing in accordance with diagnostic tasks. 2. Development and software implementation of the algorithm for constructing the axes of symmetry of the object for mirroring. 3. Development of algorithms and appropriate software modules for the comparison of the pathological part of the studied object with a mirror image of its healthy part and the visualization of differences in 3-D reconstruction of the object. Main results: the literature related to digital image processing is analyzed, the algorithm of construction of symmetry axes is developed and implemented, software modules for realization of asymmetry detection are developed.
24
Basley, Jérémy. "An Experimental Investigation on Waves and Coherent Structures in a Three-Dimensional Open Cavity Flow." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112245/document.
Повний текст джерелаАнотація:
Une écoulement de cavité ouverte tridimensionnel saturé non-linéairement est étudié par une approche spatio-temporelle utilisant des données expérimentales résolues à la fois en temps et en espace. Ces données ont été acquises dans deux plans longitudinaux, respectivement perpendiculaire et parallèle au fond de la cavité, dans le régime incompressible, en air ou en eau. À l'aide de multiples méthodes de décompositions globales en temps et en espace, les ondes et les structures cohérentes constituant la dynamique dans le régime permanent et pouvant être produites par des mécanismes d'instabilités différents sont identifiées et caractérisées.Tout d'abord, on approfondit la compréhension de l'effet des non-linéarités sur les oscillations auto-entretenues de la couche cisaillée impactante et leurs interactions avec l'écoulement intra-cavitaire. En particulier, l'analyse spectrale d'une portion de l'espace des paramètres permet de mettre en évidence un lien entre l'accrochage des modes d'oscillations auto-entretenues, la modulation d'amplitude au niveau du coin impactant et l'intermittence de ces modes. De plus, l'observation des basses fréquences intéragissant fortement avec les oscillations de la couche de mélange démontre l'existence d'une dynamique tridimensionnelle intrinsèque à l'intérieur de la cavité malgré les perturbations causées par la couche cisaillée instable.Les analyses de stabilité linéaire ont montré que des instabilités centrifuges peuvent résulter de la courbure induite par la recirculation. L'étude de la dynamique après saturation révèle de nombreuses structures cohérentes dont les propriétés sont quantifiées et classées en s'appuyant sur la forme des instabilités sous-jacentes: des ondes transverses progressives ou stationnaires. Enfin, certains comportements des structures saturées suggèrent que les mécanismes non-linéaires gouvernant le développement de l'écoulement une fois sorti du régime linéaire pourraient être étudiés dans le cadre des équations d'amplitudeA space-time study of a three-dimensional nonlinearly saturated open cavity flow is undertaken using time-resolved space-extended experimental data, acquired in both cross-stream and spanwise planes, in incompressible air and water flows. Through use of multiple modal decompositions in time and space, the waves and coherent structures composing the dynamics in the permanent regime are identified and characterised with respect to the instabilities arising in the flow.Effects of nonlinearities are thoroughly investigated in the impinging shear layer, regarding the self-sustained oscillations and their interactions with the inner-flow. In particular, the analysis conducted throughout the parameter space enlightens a global connection between the selection of locked-on modes and the amplitude modulation at the impingement and the mode switching phenomenon. Furthermore, observations of low frequencies interacting drastically with the shear layer flapping motion underline the existence of intrinsic coherent three-dimensional dynamics inside the cavity in spite of the shear layer disturbances.Linear stability analyses have demonstrated that centrifugal instabilities are at play along the main recirculation. The present investigation of the dynamics after onset of the saturation reveals numerous space-time coherent structures, whose properties are quantified and classified with respect to the underlying instabilities: travelling or standing spanwise waves. Finally, some patterns exhibited by the saturated structures suggest that the nonlinear mechanisms governing the mutations of the flow after the linear regime could gain more insight in the frame of amplitude equations
25
Séqueira, Jean. "Modélisation interactive d'objets de forme complexe à partir de données hétérogènes : application à la représentation géométrique des organes du corps humain." Besançon, 1987. http://www.theses.fr/1987BESA2028.
Повний текст джерела
26
Monfret, Tony. "Utilisation de la composante verticale du mode fondamental des ondes de rayleigh du manteau : etude de la source sismique et modelisation tri-dimensionnelle de la terre." Paris 7, 1988. http://www.theses.fr/1988PA077123.
Повний текст джерелаАнотація:
La methode developpee permet, tout en estimant le temps de source du processus de rupture, de contraindre la profondeur du centroide et de determiner le tenseur de moments sismiques. Lorsque la source ne peut plue etre assimilee a un point, une methode proposee permet de mesurer les parametres associes a la propagation du front de rupture. Enfin un modele tri-dimensionnel de terre qui est peu different des modeles actuels est propose
27
Kim, Hyoseob. "Three dimensional sediment transport model." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359035.
Повний текст джерела
28
Campos, RogeÌrio. "Three-dimensional reservoir sedimentation model." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421172.
Повний текст джерела
29
Deugoue, Gabriel. "Existence of solutions for stochastic Navier-Stokes alpha and Leray alpha models of fluid turbulence and their relations to the stochastic Navier-Stokes equations." Thesis, University of Pretoria, 2010. http://hdl.handle.net/2263/25566.
Повний текст джерелаАнотація:
In this thesis, we investigate the stochastic three dimensional Navier-Stokes-∝ model and the stochastic three dimensional Leray-∝ model which arise in the modelling of turbulent flows of fluids. We prove the existence of probabilistic weak solutions for the stochastic three dimensional Navier-Stokes-∝ model. Our model contains nonlinear forcing terms which do not satisfy the Lipschitz conditions. We also discuss the uniqueness. The proof of the existence combines the Galerkin approximation and the compactness method. We also study the asymptotic behavior of weak solutions to the stochastic three dimensional Navier-Stokes-∝ model as ∝ approaches zero in the case of periodic box. Our result provides a new construction of the weak solutions for the stochastic three dimensional Navier-Stokes equations as approximations by sequences of solutions of the stochastic three dimensional Navier-Stokes-∝ model. Finally, we prove the existence and uniqueness of strong solution to the stochastic three dimensional Leray-∝ equations under appropriate conditions on the data. This is achieved by means of the Galerkin approximation combines with the weak convergence methods. We also study the asymptotic behavior of the strong solution as alpha goes to zero. We show that a sequence of strong solution converges in appropriate topologies to weak solutions of the stochastic three dimensional Navier-Stokes equations. All the results in this thesis are new and extend works done by several leading experts in both deterministic and stochastic models of fluid dynamics.Thesis (PhD)--University of Pretoria, 2010.
Mathematics and Applied Mathematics
unrestricted
30
Liang, Chen. "3D model reconstruction from silhouettes." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/b40203311.
Повний текст джерела
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Liang, Chen, and 梁晨. "3D model reconstruction from silhouettes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40203311.
Повний текст джерела
32
Рєзва, Ксенія Сергіївна. "Удосконалення проточних частин високонапірних оборотних гідромашин на основі чисельного моделювання їх гідродинамічних характеристик". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40009.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.17 – гідравлічні машини і гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2019 р.
Дисертацію присвячено вирішенню науково-практичної задачі удосконалення проточних частин високонапірних оборотних гідромашин за рахунок розробки методів розрахунку та аналізу їх гідродинамічних характеристик. На підставі розгляду тенденцій розвитку гідроенергетики України, з урахуванням ролі високонапірних оборотних гідромашин в об'єднаній енергетичній системі, відмічено актуальність проектування нових проточних частин. Визначено переваги та недоліки існуючих методів дослідження гідродинамічних процесів у проточних частинах оборотних гідромашин. Наведені результати розрахунку гідродинамічних характеристик елементів проточної частини на основі методу осереднених безрозмірних параметрів для оборотних гідромашин ОРО200-В-100 та ОРО500-В-100. Застосована математична модель робочого процесу гідромашини на основі блочно-ієрархічного підходу для проведення дослідження балансу енергії. Визначено вплив геометричних параметрів елементів проточної частини на показники роботи. Проведено чисельне дослідження просторової течії рідини в проточній частині високонапірних оборотних гідромашин за допомогою CFD, що дозволило визначити та візуалізувати картину течії. Складено баланси енергії гідромашин ОРО200-В-100 та ОРО500-В-100. Відмічено, що розподіл втрат по елементам проточної частини нерівномірний: для ОРО200-В-100 найбільшу частину втрат складають втрати в робочому колесі (близько 56 %), для ОРО500-В-100 – втрати у підводі (близько 62 %). Описано основні положення визначення оптимального режиму роботи оборотної гідромашини. Запропоновано та досліджено модифікований підвід для тихохідної оборотної гідромашини ОРО500-В-100, щоб підвищити її енергетичні показники: краще узгоджені елементи ПЧ та гідравлічний ККД збільшився на 2 %.Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.05.17 – Hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", 2019. The tеhesis is devoted to the solution of the scientific and practical problem of improvement of the water passages of the high-pressure reversible hydraulic due to calculation and analysis their hydrodynamic characteristics. Based on the review of the trends in the development of hydropower engineering in Ukraine and given the role of high-pressure reversible hydraulic machines in the United Power System, it was noted that the designing a new flow parts is topical task. Advantages and disadvantages of the existing methods for research hydrodynamic processes in water passages of reversible hydraulic machines were identified after their analysis. The results of the calculation of the hydrodynamic characteristics of the elements of the water passages based on the method of averaged dimensionless parameters using the example of reversible hydraulic machines OPO200-B-100 and OPO500-B-100 were demonstrated. The mathematical model of the hydraulic machine working process based on a block-hierarchical approach was used to study the energy balance in the turbine and pump modes of hydraulic machines. The influence of the geometrical parameters of the elements of the water passage on the performance was determined: how the angle of flow in the spiral casing (cп ), the height of the wicket gate (b0 D) and the shape of the wicket gate profile influence the value of the coefficient resistance in the wicket gate. A numerical study of the three-dimensional flow of fluid in the water passage of high-pressure reversible hydraulic machines was carried out using the CFD software. This program allows determining the character of the flow and presenting the fields of distribution of velocity components, pressure and streamlines. The balances of energy were compiled: for the OPO200-B-100 in the turbine and pump operation modes, for the OPO500-B-100 in the turbine operation mode. It is noted that the distribution of losses on the elements of the water passage is not uniform: for the OPO200-B-100, the greatest part of the total losses are losses in the runner (about 56%), for OPO500-B-100 - losses in the inlet (about 62%). The main points for determining the optimal operating mode of the reversible hydraulic machine are described. The modified inlet for low-speed high-pressure hydraulic machine OPO500-B-100 was proposed and investigated to increase energy performance of hydraulic machine. The spiral casing was expanded, the number of stay vane blades and wicket gate blades were reduced to 16. As a result of the calculations of the modified inlet, the obtained results showed that the second variant made it possible to better align the elements of the water passage and the hydraulic efficiency increased by 2 %.
33
Рєзва, Ксенія Сергіївна. "Удосконалення проточних частин високонапірних оборотних гідромашин на основі чисельного моделювання їх гідродинамічних характеристик". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40011.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.17 – гідравлічні машини і гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2019 р.
Дисертацію присвячено вирішенню науково-практичної задачі удосконалення проточних частин високонапірних оборотних гідромашин за рахунок розробки методів розрахунку та аналізу їх гідродинамічних характеристик. На підставі розгляду тенденцій розвитку гідроенергетики України, з урахуванням ролі високонапірних оборотних гідромашин в об'єднаній енергетичній системі, відмічено актуальність проектування нових проточних частин. Визначено переваги та недоліки існуючих методів дослідження гідродинамічних процесів у проточних частинах оборотних гідромашин. Наведені результати розрахунку гідродинамічних характеристик елементів проточної частини на основі методу осереднених безрозмірних параметрів для оборотних гідромашин ОРО200-В-100 та ОРО500-В-100. Застосована математична модель робочого процесу гідромашини на основі блочно-ієрархічного підходу для проведення дослідження балансу енергії. Визначено вплив геометричних параметрів елементів проточної частини на показники роботи. Проведено чисельне дослідження просторової течії рідини в проточній частині високонапірних оборотних гідромашин за допомогою CFD, що дозволило визначити та візуалізувати картину течії. Складено баланси енергії гідромашин ОРО200-В-100 та ОРО500-В-100. Відмічено, що розподіл втрат по елементам проточної частини нерівномірний: для ОРО200-В-100 найбільшу частину втрат складають втрати в робочому колесі (близько 56 %), для ОРО500-В-100 – втрати у підводі (близько 62 %). Описано основні положення визначення оптимального режиму роботи оборотної гідромашини. Запропоновано та досліджено модифікований підвід для тихохідної оборотної гідромашини ОРО500-В-100, щоб підвищити її енергетичні показники: краще узгоджені елементи ПЧ та гідравлічний ККД збільшився на 2 %.Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.05.17 – Hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", 2019. The tеhesis is devoted to the solution of the scientific and practical problem of improvement of the water passages of the high-pressure reversible hydraulic due to calculation and analysis their hydrodynamic characteristics. Based on the review of the trends in the development of hydropower engineering in Ukraine and given the role of high-pressure reversible hydraulic machines in the United Power System, it was noted that the designing a new flow parts is topical task. Advantages and disadvantages of the existing methods for research hydrodynamic processes in water passages of reversible hydraulic machines were identified after their analysis. The results of the calculation of the hydrodynamic characteristics of the elements of the water passages based on the method of averaged dimensionless parameters using the example of reversible hydraulic machines OPO200-B-100 and OPO500-B-100 were demonstrated. The mathematical model of the hydraulic machine working process based on a block-hierarchical approach was used to study the energy balance in the turbine and pump modes of hydraulic machines. The influence of the geometrical parameters of the elements of the water passage on the performance was determined: how the angle of flow in the spiral casing (cп ), the height of the wicket gate (b0 D) and the shape of the wicket gate profile influence the value of the coefficient resistance in the wicket gate. A numerical study of the three-dimensional flow of fluid in the water passage of high-pressure reversible hydraulic machines was carried out using the CFD software. This program allows determining the character of the flow and presenting the fields of distribution of velocity components, pressure and streamlines. The balances of energy were compiled: for the OPO200-B-100 in the turbine and pump operation modes, for the OPO500-B-100 in the turbine operation mode. It is noted that the distribution of losses on the elements of the water passage is not uniform: for the OPO200-B-100, the greatest part of the total losses are losses in the runner (about 56%), for OPO500-B-100 - losses in the inlet (about 62%). The main points for determining the optimal operating mode of the reversible hydraulic machine are described. The modified inlet for low-speed high-pressure hydraulic machine OPO500-B-100 was proposed and investigated to increase energy performance of hydraulic machine. The spiral casing was expanded, the number of stay vane blades and wicket gate blades were reduced to 16. As a result of the calculations of the modified inlet, the obtained results showed that the second variant made it possible to better align the elements of the water passage and the hydraulic efficiency increased by 2 %.
34
Tremblay, André 1948. "A three dimensional cloud chemistry model /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73980.
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35
Gray, Sean. "Bootstrapping the Three-dimensional Ising Model." Thesis, Uppsala universitet, Teoretisk fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-322146.
Повний текст джерелаАнотація:
This thesis begins with the fundamentals of conformal field theory in three dimensions. The general properties of the conformal bootstrap are then reviewed. The three-dimensional Ising model is presented from the perspective of the renormalization group, after which the conformal field theory aspect at the critical point is discussed. Finally, the bootstrap programme is applied to the three-dimensional Ising model using numerical techniques, and the results analysed.
36
Wang, Lu, and 王璐. "Three-dimensional model based human detection and tracking in crowded scenes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46587421.
Повний текст джерела
37
Pan, Qi. "Rapid 3D model reconstruction from a single camera." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610735.
Повний текст джерела
38
Dodd, Thomas G. "Development of a three dimensional terrain display for a light infantry platoon combat model." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA247994.
Повний текст джерелаАнотація:
Thesis (M.S. in Systems Technology (Command, Control, and Communication))--Naval Postgraduate School, June 1990.Thesis Advisor(s): Parry, Samuel H. Second Reader: Hoffman, James C. "June 1990." Description based on signature page as viewed on October 21, 2009. Page 21 is missing and not attainable. DTIC Identifier(s): Combat models. Author(s) subject terms: Three dimensional graphics display, combat model, DYNTACS terrain representation. Includes bibliographical references (p. 134-135). Also available online.
39
Bolger, John Jude. "Three dimensional design of compressor blades." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/251477.
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40
Zhu, Hongyan. "A minimal three-dimensional tropical cyclone model." Diss., [S.l. : s.n.], 2002. http://edoc.ub.uni-muenchen.de/archive/00000260/.
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41
Kapur, Tina. "Model based three dimensional medical image segmentation." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80007.
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42
Syn, Michael Hsien-Min. "Model-based three-dimensional freehand ultrasound imaging." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627596.
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43
Cameron, Heather M. "Constraint satisfaction for interactive 3-D model acquisition." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28937.
Повний текст джерелаАнотація:
More and more computer applications are using three-dimensional models for a variety of uses (e.g. CAD, graphics, recognition). A major bottleneck is the acquisition of these models. The easiest method for designing the models is to build them directly from images of the object being modelled. This paper describes the design of a system, MOLASYS (for MOdeL Acquisition SYStem), that allows the user to build object models interactively from underlying images. This would not only be easier for the user, but also more accurate as the models will be built directly satisfying the dimensions, shape, and other constraints present in the images.
The object models are constructed by constraining model points and edges to match points in the image objects. The constraints are defined by the user and expressed using a Jacobian matrix of partial derivatives of the errors with respect to a set of camera and model parameters. MOLASYS then uses Newton's method to solve for corrections to the parameters that will reduce the errors specified in the constraints to zero. Thus the user describes how the system will change, and the program determines the best way to accomplish the desired changes.
The above techniques, implemented in MOLASYS, have resulted in an intuitive and flexible tool for the interactive creation of three-dimensional models.Science, Faculty of
Computer Science, Department of
Graduate
44
Tsang, Moses T. "3-D finite element beam/connector model for a glulam dome cap." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09052009-040556/.
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Bricis, Anne. "Three dimensional simulation of cloth drape." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/6932.
Повний текст джерелаАнотація:
Research has been carried out in the study of cloth modelling over many decades. The more recent arrival of computers however has meant that the necessary complex calculations can be performed quicker and that visual display of the results is more realistic than for the earlier models. Today's textile and garment designers are happy to use the latest two dimensional design and display technology to create designs and experiment with patterns and colours. The computer is seen as an additional tool that performs some of the more tedious jobs such as re-drawing, re-colouring and pattern sizing. Designers have the ability and experience to visualise their ideas without the need for photo reality. However the real garment must be created when promoting these ideas to potential customers. Three dimensional computer visualisation of a garment can remove the need to create the garment until after the customer has placed an order. As well as reducing costs in the fashion industry, realistic three dimensional cloth animation has benefits for the computer games and film industries. This thesis describes the development of a realistic cloth drape model. The system uses the Finite Element Method for the draping equations and graphics routines to enhance the visual display. During the research the problem of collision detection and response involving dynamic models has been tackled and a unique collision detection method has been developed. This method has proved very accurate in the simulation of cloth drape over a body model and is also described in the thesis. Three dimensional design and display are seen as the next logical steps to current two dimensional practices in the textiles industry. This thesis outlines current and previous cloth modelling studies carried out by other research groups. It goes on to provide a full description of the drape method that has been developed during this research period.
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Chang, Ka Kit. "Human model reconstruction from image sequence /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20CHANG.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 124-134). Also available in electronic version. Access restricted to campus users.
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Tsang, Kin Ting. "Interactive 3D model reconstruction from images and quasi-dense points /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?COMP%202004%20TSANG.
Повний текст джерелаАнотація:
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.Includes bibliographical references (leaves 59-62). Also available in electronic version. Access restricted to campus users.
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Lauzon, Louise. "Evaluation of a three dimensional cloud chemistry model." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56995.
Повний текст джерелаАнотація:
To evaluate the precision of a three dimensional cloud chemistry model, the ion concentrations of simulated clouds are compared with the chemical analysis of cloud water samples collected in the Muskoka, Ontario area. Five summer case studies are presented.In general, the simulated concentrations of NO$ sbsp{3}{-},$ NH$ sbsp{4}{+},$H$ sp+$, H$ sb2O sb2$ and the concentrations of SO$ sbsp{4}{2-}$ calculated with the perfect nucleation condition concur with the observed concentrations. For the four polluted cases, more than 80% of the cloud water SO$ sbsp{4}{2-}$ comes from nucleation, whereas for the clean case, it is mostly created by SO$ sb2$ oxidation. The relative importance of $ rm H sb2O sb2$ and O$ sb3$ in SO$ sb2$ oxidation, as well as the relative importance of nucleation and NH$ sb3$ absorption on the cloud water NH$ sbsp{4}{+}$ budget vary according to the chemical state of the atmosphere.
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Aubry, Stéphane. "Three-dimensional model construction from multiple sensor viewpoints." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41524.
Повний текст джерелаАнотація:
This work addresses the automatic construction of geometric models of real scenes, from multi-view three-dimensional sensor data.We review range data acquisition, multi-view integration, and solid modeling. We show that knowledge about the data acquisition procedure yields not only the coordinates of the acquired points, but also additional geometrical information. We use that information to draw a geodesic proximity graph with respect to the surface the data points lie on. Such a graph is useful because it provides the connectivity information necessary for subsequent differential-geometric processing, and three-dimensional surface modeling. We say that the graph is a least-commitment boundary representation, because it does not involve the use of higher level or cognitive processes.
We specialize the concept to the common case of line-of-sight optical sensors. We give formal definitions of graph validity using assumptions of object opacity and object rigidity, and we demonstrate that Euclidean proximity graphs drawn on the data points are not valid when the data is sparse with respect to surface concavities.
We describe a sub-quadratic incremental view integration algorithm that assumes the data is highly-organized. It guarantees graph validity under restrictive conditions. Therefore, we present another non-incremental algorithm with no assumption on the input data organization. It is based on an iterative carving of the graph faces, starting with the convex hull of all points as the initial model. It builds a hierarchy of models, each of which is internal to the previous one. We test the algorithm with real data on an object homeomorphic to a sphere, and incorporate heuristics designed to yield more geometrically pleasing results.
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Sampson, R. Mark. "Three dimensional visualization of a coastal mesoscale model." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA278576.
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