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 58 for “"DDA"”.
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A new method of meshing in discontinuous deformation analysis (DDA)
Discontinuous Deformation Analysis (DDA) is a discrete element method developed by Shi [1988] specifically for modelling blocky rock masses. The DDA method is based on the assumption that deformation and failure of such rock masses is primarily due to differential movements of rock blocks, rather …
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DDA-based Inverse Design of Nanophotonic Metasurfaces: a Benchmarking of Optimization Techniques
… produced by the numerical methods. A unique DDA solver is used to speed up the computation of the electromagnetic fields, which are used to determine the quality of the proposed designs. Fabrication limitations are also taken into consideration, and various filters were used to introduce a …
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A re-entry control system using delta-modulated accelerometers and a DDA-computer
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1964
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Die Dehydro-Diels-Alder-Reaktion (DDA-Reaktion) als neue Methode zur Darstellung von Naphthalenophanen
Die Dissertation beschreibt die Herstellung von ringförmigen Verbindungen (Naphthalenophanen) mit Hilfe der Dehydro-Diels-Alder-Reaktion, wobei immer Enantiomerenpaare auftreten. Es wird der diastereoselektive Aufbau von Naphthalenophanen und der enantiomeren reine Aufbau von Biarylen untersucht. …
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Digital dating abuse in the LGBTQIA+ community
… has examined these digital dating abuse (DDA) behaviors among adolescent and college populations, yet few studies have investigated the prevalence of perpetration, victimization, and impact of DDA within the relationships of the LGBTQIA+ community. Current literature has outlined …
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The impact of the Disability Discrimination Act Part 4 on Scottish schools
… until the Disability Discrimination Act (DDA, 1995) launched the Special Educational Needs and Disability Act, also known as Part 4 in 2001 (DDA, 2001). The DDA attempted to impose a rights-based model of equality on education. The survey data and qualitative in-depth interviews generated …
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An Investigation into Machine Learning Techniques for Designing Dynamic Difficulty Agents in Real-Time Games
… the use of Dynamic Difficulty Adjustment (DDA) systems that adjust the difficulty of the game in response to the player’s performance. This research seeks to establish the effectiveness of machine learning techniques for use in developing DDA systems in real-time games for the purpose of …
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Formulation and characterisation of an effective particulate delivery vehicle for the novel sub-unit vaccine antigen, Ag85B-ESAT-6
… potent adjuvant dimethyl dioctadecyl ammonium (DDA). These studies demonstrated that addition of the immunomodulatory trehalose dibehenate (TDB) enhanced the physical stability of the system whilst also adding further adjuvanticity. Indeed, this formulation was effective in stimulating both a …
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South Africa's foreign policy and the domestic developmental agenda
… what extent the domestic developmental agenda (DDA) informs the formulation of South African foreign policy with regards to national development priorities. The DDA does not refer to a formally agreed consensus-based national agenda; instead, it is used in this study to denote a tacit collective …
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Part I: Self-Assembling Dendrimers Using the Dda-Aad Hydrogen Bonding Motif. Part II: Supramolecular Discotic Liquid Crystals Through Hydrogen Bond Mediated Self-Assembly
In part II, the ability of this heterocyclic unit to generate a self-assembled structure in bulk was tested by attachment of a 3,4,5-tris-dodecyloxybenzyl group to the 8-amino group and evaluating the mesomorphic properties of the resulting derivative. Cumulative solution studies by 1H NMR, SEC and …
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Development of a Medium Scale Apparatus for Testing & Teaching Dispersed Dust Flame Effects
… A mobile inexpensive dust dispersion apparatus (DDA) was designed, built, and tested to reproduce medium scale dust flash fires. By using fuel amounts varying from 0.45kg to 4.54kg the DDA created dust clouds ranging from 2.5m to 7.5m in diameter. With these measurements, the characterization of …
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A Critical Review of Staff Engagement with Performance Conversations Within Hywel Dda Health University Health Board. How Does Psychological Safety Relate to Engagement with Performance Conversations?
… of psychological safety. This is vital to Hywel Dda University Health Board (HDdUHB) as it strives to engage staff with effective performance management (Gostling, 2020) which enables safe and efficient patient care (HDdUHB, 2018), training and retention (HEIW, 2023), under significant financial …
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Applying the Newmark Method to the Discontinuous Deformation Analysis
Discontinuous deformation analysis (DDA) is a newly developed simulation method for discontinuous systems. It was designed to simulate systems with arbitrary shaped blocks with high efficiency while providing accurate solutions for energy dissipation. But DDA usually exhibits damping effects that …
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Assessing the Impacts of a Special Safeguard Mechanism for Agriculture in the Doha Development Agenda
… Organization's (WTO) Doha Development Agenda (DDA) are calling for a specific Special Safeguard Mechanism (SSM) for developing countries that will protect agricultural producers from import surges or price declines, and could potentially add stability to domestic markets. While most of the …
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A Study of GPR Performance in the Presence of Buried Biomass
… simulations, the discrete dipole approximation (DDA) was employed to model scattering from roots in a homogeneous medium. Slight modifications permitted it to model the GPR data. Comparisons of the DDA code's results against those of well-known codes and various experiments are presented to …
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Molar Incisor Hypomineralization and Developmental Dental Anomalies: A Case-Control Study
… and co-existing developmental dental anomalies (DDA). Methods: This case-control study included children aged 6–13 years, with the presence of MIH serving as the inclusion criterion for the case group. Each child with MIH was matched with a child without MIH of similar age and demographic …
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Housing with authority : the role of public and private architects in public housing in Delhi
… built by the Delhi Development Authority (DDA). One was designed in-house by DDA architects and the second by a private architect. Working within similar constraints of economy, bureaucratic requirements and time, the results produced were very different. On the basis of the difference in …
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Informe de expediente civil, materia: prescripción adquisitiva de dominio, No. de Expediente: 02678-2017-0-0401-JR-CI-08 Informe de expediente administrativo, materia: competencia desleal, No. de Expediente: 977-2011/DDA
… Competencia Desleal Nº de Expediente: 977-2011/DDA. El expediente administrativo que da pie al siguiente informe versa sobre sobre una denuncia relacionada con posibles prácticas de competencia desleal, específicamente en forma de actos de confusión y explotación indebida de la reputación ajena. …
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A physical model to estimate snowfall over land using microwave measurements
… atmosphere.The Discrete Dipole Approximation (DDA) method was employed to generate the single scattering parameters for nonspherical snow crystals. Comparisons show that neither equivalent spheres nor dielectric mixing theories could account for all measurements. Therefore, this study builds a …
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MICROARCHITECTURE OF A HIGH THROUGHPUT TEXTURE MAPPING PROCESSOR FOR INTERACTIVE 3D GRAPHICS
… processor uses digital differential analyzers (DDA), during span interpolation of a triangle, to calculate the texel addresses of the texture map. Subpixel correction is implemented inexpensively by means of the addition or subtraction of partial products instead of a full multiplication. …
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