Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Geometrical model"”.
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A new classification approach based on geometrical model for human detection in images
… in this approach is based on applying a geometrical model which contains a set of parameters related to the object’s upper portion. Based on the result of these geometric parameters, our approach can simply classify the detected object as human or non-human. In general, the classification …
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Geometrical Models for 2D Morphometry in Bioimages
… of pixels composing each object. In contrast, geometrical models representing the contour of objects as continuous parametric curves are free from discretisation artefacts and are therefore excellent alternative candidates for morphometry. The extraction of this kind of contour representation …
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Development of a Fast X-ray Line Detector System for Two-Phase Flow Measurement
… of the system development: establishing a geometrical model for the line detector system, conducting spectral analysis for X-ray attenuation in two-phase flow, and performing calibration tests. The geometrical model has considered the measurement plane, geometry of the test-section wall and …
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Marking A Center: Concept, Geometry, and Assembly
… gestural idea or sketch into a language which is geometrically descriptive and consequently reproducible. The second stage of the process involves the translation of geometrical ideas into the language of construction. How can the dimensionless character of a geometrical model be expressed and …
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Monte Carlo simulation of neutron shielding for proton therapy facilities
… was performed to develop a Monte Carlo method of modeling neutron shielding of proton therapy facilities in a complex, realistic environment. The bulk neutron shielding of the Northeast Proton Therapy Center (Massachusetts General Hospital, Boston, MA) was used as the basis of the design work. A …
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Finite element damage modeling of plain weave fabrics
… behavior of such composites. In this work, the geometrical model needed for finite element discretization of the plain weave fabrics are developed for three configurations---single lamina, iso-phase, and out-of-phase. Next, a procedure to determine the longitudinal elastic modulus under tensile …
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Synthesis and evaluation of radioactive gold nanoparticles for cancer treatment and imaging
… research, MCNP code was used to build a simple geometrical model of a human prostate, and then estimate the dose distribution that is deposited by radioactive gold nanoparticles (198AuNPs or 199AuNPs). The results from in vivo evalution of MGF-198AuNPs indicated that MGF-198AuNPs have …
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On the structure of geometries with spinor-type connexion
… spinor fields in curved space-time. A geometric model for spinor fields in curved space-time is described which is based upon properties of so-called tangent Clifford algebras. The tangent Clifford algebra to a space-time manifold at a certain point is the quotient space of the algebra of …
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Methoden der EDV-gestützten, dreidimensionalen Lagerstättenmodellierung am Beispiel ausgewählter Bauxitvorkommen
… to realize the computer-aided three-dimensional modeling of bauxite deposits by use of the exploration and mining Software DATAMINETM. The developed methodology of the computer-aided orebody modeling exists of four stages, by name first the conceptual model, second the geometrical model, third …
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Good families of quantum low-density parity-check codes and a geometric framework for the amplitude-damping channel
… propagation. Furthermore, we present a general geometrical model to design non-additive quantum error-correcting codes for the amplitude-damping channel. Non-additive quantum error-correcting codes are more general than stabilizer or additive quantum errorcorrecting codes, and in some cases …
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Anatomische und biomechanische Untersuchungen zur Optimierung und Risikominimierung der segmentalen spinalen Wirbelsäuleninstrumentation bei neuromuskulärer Skoliose
… forces (static force). Additionally, using a geometrical model, the theoretical risk for wire penetration of the neural canal (ISSI technique) was evaluated. The first main chapter of this dissertation describes the disease "scoliosis" in detail. In the second main chapter the data of ten …
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On the Crossroads of Science, Philosophy and Literature: Andrey Bely's "Petersburg"
… his era. I discuss his novel in the view of his geometrical model of universal and human evolution, which he described in two lesser known essays written in 1912: "The Line, the Circle, the Spiral--of Symbolism" and "Circular Movement." Taking these essays as my point of departure, I examine …
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Multi-scale modelling of III-nitrides: from dislocations to the electronic structure
… thus material properties) are grown. Theoretical modelling is a useful tool for gaining understanding of various phenomena and materials properties. The scope of the present work is wide. It ranges from a continuum theory of dislocations treated within the linear elasticity theory, connects the …
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Thermal Control on the Location of the Volcanic Arc at Subduction Zones
… melt focusing mechanism. I present a simple geometrical model to explain the observed correlation between the location of the arc and the back-arc spreading center (BASC) at five subduction zones. Lastly, I discuss the thermal influence of the BASC on the arc location. The melts rise …
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The Impact of substrate texture on cell behavior
… pattern, a finding which we explained using a geometrical model based on cell size. The behaviour of 3T3 cell lines and the hMSCs were compared for the different types of pattern. We designed setups that allow us to perform Raman microspectroscopy both in 2D and 3D topographical patterns in …
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Bench blast modeling: Consequences of crushed zone, wave front shape, and radial cracks.
A geometrical model for the rock crushed zone around a cylindrical charge is developed. The model is used to obtain empirical relationships between the scaled crushed zone diameter and some dimensionless ratios of explosive and rock properties. The ratios are velocity ratio, characteristic …
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Reconstruction Methods for Optical Molecular Tomography
… of optical molecular tomography includes the geometrical model, tissue properties, photon characteristics, transport model, and reconstruction algorithm. This dissertation focuses mainly on the development optical molecular tomography methods based on bioluminescence/fluorescence probes to …
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Mathematical models of hyphal tip growth
… considerable attention from mathematical modellers. In this thesis, we consider mathematical models of fungal tip growth that can be classified as either geometrical or biomechanical. In every model we examine, a 2-D axisymmetric semihemisphere-like curve represents half the medial section …
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Computational biomechanics of acute myocardial infarction and its treatment
… infarct induction was studied using rat infarct model. A micro-structural three-dimensional geometrical model of the entire injectate was reconstructed from histological micro graphs. The model provides a realistic representation of biomaterial injectates in computational models at macroscopic …
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Discrete element method modelling of particle breakage and wear in High Pressure Grinding Rolls
… This study aims to develop a comprehensive model based on the discrete element method (DEM) to investigate the grinding process of HPGR and understand the underlying mechanisms. A laboratory-scale geometrical model of the HPGR mill was developed and the dynamic response of the rolls in the …
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