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 33 for “"continuous model"”.
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Determination of axial load and support stiffness of continuous beams by vibration analysis
Three models are presented which predict frequencies and mode shapes of transverse vibration for a continuous prismatic Bernoulli-Euler beam on elastic supports, subjected to a compressive axial load. The first model, which approximates support stiffnesses by an equivalent elastic foundation, is …
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Fraisse Theory for Metric Structures
We also prove a theorem, in the setting of continuous model theory, that is a generalization of a theorem of H. D. Macpherson about the automorphism groups of o-categorical structures.
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A comparison of discrete and flow-based models for air traffic flow management
… throughout the network. In recent years, several models have been proposed to predict and manage air traffic. This thesis focuses on the comparison of two such approaches to air traffic flow management: (i) a discrete Mixed Integer Program model, and (ii) a continuous flow-based model. The …
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ΔΙΕΡΕΥΝΗΣΗ ΤΗΣ ΑΞΙΟΠΙΣΤΙΑΣ ΙΣΟΔΥΝΑΜΩΝ ΠΛΑΙΣΙΑΚΩΝ ΠΡΟΣΟΜΟΙΩΜΑΤΩΝ ΓΙΑ ΠΥΡΗΝΕΣ ΠΟΛΥΟΡΟΦΩΝ ΚΤΙΡΙΩΝ ΥΠΟ ΟΡΙΖΟΝΤΙΑ ΦΟΡΤΙΣΗ
… ANALYTICAL METHODS(SURFACE FINITE ELEMENTS AND CONTINUOUS MODEL OF VLASSOV) HAS BEEN MADE. THUS,IN THE FIRST STAGE THOROUGH INVESTIGATION IS MADE IN ORDER TO CHECK THE RELIABILITY OF THE VARIOUS FRAME MODELS FOR ISOLATED CORES OF DIFFERENT TYPES (OPEN, SEMI-OPEN CORES WITH LINTEL BEAMS, CLOSED …
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Localisation of Bose-Einstein condensates in optical lattices
… in optical lattices are well-described by a continuous model using the Gross-Pitaevskii equation in a modulated potential or, in the case of deep potentials, a discrete model using the Discrete Nonlinear Schrodinger equation. Spatially localised modes, known as lattice solitons in the …
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Analysis and implementation of a positivity preserving numerical method for an HIV model
… preserving numerical method for a vaccination model for the transmission dynamics of two HIVsubtypesnin a given community. The continuous model is analyzed for stability and equilibria. The qualitative information thus obtained is used while designing numerical method(s). Three numerical …
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Influência da rotação no comportamento dinâmico de rotores flexíveis
… moment. A simplified analysis is first made of a model with two degrees of freedom. Then, a continuous cantileveredsystem is simulated through a differential equation. The disc is considered as a boundary condition. Finally a last continuous model considers the disc in the differential equation, …
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ΑΣΤΑΘΗΣ ΡΟΗ ΣΕ ΚΑΡΣΤΙΚΑ ΥΔΡΟΦΟΡΑ ΣΤΡΩΜΑΤΑ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΩΝ ΠΕΠΕΡΑΣΜΕΝΩΝ ΣΤΟΙΧΕΙΩΝ
… IN A CONFINED KARST AQUIFER IS STUDIED BY THE MODEL OF DOUBLE POROSITY. THIS IS A CONTINUOUS MODEL BUT IT TAKES INTO ACCOUNT THE HETEROGENEITY OF POROUS MEDIA. IT IS ALSO ASSUMED THAT IN KARST AQUIFERS THE FLOW CAN BE BEYOND THE UPPER LIMIT OF THE VALIDITY OF DARCY'S LAW. THE NONLINEAR …
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A Comparison of Discrete and Continuous Survival Analysis
… has been confusion in choosing a proper survival model between two popular survival models of discrete and continuous survival analysis. This study aimed to provide empirical outcomes of two survival models in educational contexts and suggest a guideline for researchers who should adopt a suitable …
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Proving safety properties of an aircraft landing protocol using timed and untimed I/O automata : a case study
… frameworks. We construct two mathematical models of the landing protocol using the above stated frameworks. First, we study a discrete model of the protocol, in which the airspace of the airport and every movement of the aircraft are all discretized. The model is constructed by …
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Dynamics of a vertically tethered marine platform
… pattern of echoes is detectable at each end. Two models, a continuous (closed form) non-dimensional frequency domain model and a discrete finite-element time domain model are developed to represent vertically tethered systems subject to surface excitation. Both models accurately predicts the …
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Evolutionary Dynamics of the Alpha-actinin Gene Family
… concerted evolution. This conceptual leap to a continuous model has not previously been made. Furthering these generalized studies of the a-actinin gene family, I used RT-PCR, cloning and automated DNA sequencing to obtain 77bp of sequence for what may be yet another member of the spectrin …
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The influence of Inquiry Based Science Education on Grade 4 learners understanding of the particulate nature of matter in the gaseous phase
… group and the inquiry group was homogeneous. The continuous model of matter in the gaseous phase emerged as the most prominent view for both the inquiry and lecture group. The results from the post-test and second group interview suggest there was an improvement in particulate understanding in the …
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The effects of a grouping by tens manipulative on children's strategy use, base ten understanding and mathematical knowledge
… that transformed from a unitized to a continuous model, while children in the Unitized group used a manipulative that remained discrete. Researchers recorded children's strategy use and accuracy when determining how many objects appeared on the screen, and the data were examined …
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Model-Based Vibration Diagnostic of Cracked Beams in the Time Domain
A time-domain model-based crack diagnostic methodology using vibration data is presented. Most of the damage detection methods proposed to date are based on modal parameters and are limited by the loss of information caused by data reduction and by the implicit assumption of linearity. The use of …
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Exploiting Bacteriophages to Tackle Clostridium difficile Infection
… or sodium pyrophosphate. Batch fermentation models of CDI showed that a prophylactic approach to phage therapy of CDI offers a higher efficacy than a remedial regime. A continuous model of CDI in a colon model was successfully produced and demonstrated variable efficacy rates from no apparent …
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Effects of stream network topology on fish assemblage structure and bioassessment sensitivity in the mid-Atlantic highlands, USA
… In chapter 2, I developed and applied a continuous model of stream network topology to explore the effects of downstream size and proximity on local fish assemblage structure within the mid-Atlantic highlands. I found that fish assemblage structure (i.e., Bray-Curtis distances in species …
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Modeling and Manufacturing of Dynamic Vocal Folds: First Steps Towards an Active Voice-Box Prosthesis
… presented in this dissertation which focuses on modeling and manufacturing the vocal folds and aims to answer three main questions: 1) what are the mechanical properties of the vocal folds and how do they change across the full vocal range? 2) how do those properties influence the dynamic …
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Analysis and numerical simulation of tumor growth models
… focus on the numerical analysis of tumor growth models. Due to the difficulty of developing physically meaningful approximations of such models, we divide the main problem into more simple pieces of work that are addressed in the different chapters. First, in Chapter 2 we present a new upwind …
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Enhancing Android application security through source code vulnerability mitigation using artificial intelligence: a privacy-preserved, community-driven, federated-learning-based approach.
… vulnerabilities in real time, with a focus on continuous model improvement. To train the initial AI model, a dataset has been curated, containing labelled Android source code based on the common weakness enumeration (CWE) obtained by scanning over 15,000 real-world Android apps. A …
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