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.
Results
Showing 1 to 20 of 35 for “"Discrete elements"”.
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Discrete elements of the U2 snRNP regulate its intranuclear trafficking and recruitment to nascent transcripts
In this study, I characterize the elements of the U2 snRNP that control its intranuclear trafficking and association with nascent transcripts. Through a mutational analysis, I demonstrate that stem loops 3 and 4 (SL3 and SL4) are both required for U2 snRNP association with nascent transcripts and …
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SENSPECTRA : an elastic, strain-aware physical modeling interface
… assembles and refines a physical 3D model of discrete elements with a real-time visualization of structural strain. While the Senspectra infrastructure provides a flexible modular sensor network platform, its primary application derives from the need to couple physical modeling techniques …
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Contributions to the dynamics of helicopters with active rotor controls
… assumed to be fixed and computed off-line. The discrete elements of the HHC control loop are rigorously modeled, including the presence of two different time scales in the loop. By also formulating the coupled rotor-fuselage dynamics in discrete form, the entire coupled helicopter-HHC system …
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A Fourier finite element model for unsaturated flow in porous media
… method, where the spatial domain is divided into discrete elements and nodal points. A truncated Fourier series expansion was used as the approximating function over orthogonal discrete elements. The Fourier cosine series was selected for the expansion series and the same denomination is used for …
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On the synthesis of optimum monopulse antenna array distributions
… difference distributions for linear arrays of discrete elements, with a maximum sidelobe level specification. The method is based on the Zolotarev polynomial, and is precisely the difference mode equivalent of the Dolph-Chebyshev synthesis for sum patterns. When the interelement spacings are a …
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Nesting Automated Design Modules In An Interconnected Framework
… This method breaks the PDG structure into discrete elements known as PDG objects, PDG modules and PDG services. Each of these elements forms a distinct unit of reuse and each can be seen as a "little" PDG. Two different industrial implementations of this method are presented. These examples …
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Operator performance as a function of line and cell failures on a flat panel display
The effects of manipulating discrete element failure types and font types were determined on a reading performance task using a plasma panel display. Thirty male and thirty female college students attending Virginia Polytechnic Institute and State University participated as subjects. The results …
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Structural optimization: from continuum and ground structures to additive manufacturing
… structural systems, which can be modeled using discrete elements (e.g. slender columns and beams), continuum elements (e.g. walls or slabs), or combinations of these. Optimization problems become meaningful only after the objective function, or benchmark, that evaluates a given design has been …
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Warrior Women and the Shaping of Narrative in Medieval French Literature
… to shaping the narrative beyond the sum of its discrete elements.</p>
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Dwelling : a figural exploration of domesticity
… is always reflective of an enfilade of discrete elements, highly idiosyncratic and articulated to show what lies within. The architecture is localized and intimate. The spatial reading of the space is to be recognized as being within a family of discrete figures, each one serving their …
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A reactive/deliberative planner using genetic algorithms on tactical primitives
… both continuous nonlinear system dynamics and discrete actions and choices. This thesis proposes a flexible framework for forming dynamically realistic, hybrid system plans composed of parametrized tactical primitives using genetic algorithms, which implicitly accommodate hybrid dynamics …
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Additive Manufacturing Towards Electronically-Active Surfaces
… this has been achieved via fabrication of discrete elements which are then deterministically positioned throughout the world via pick-and-place assembly. Alternatively, availability of large-area, ultra-thin and continuous elements would enable seamless integration of electronics onto …
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An Exploration of the Emergence of Pattern and Form from Constraints on Growth
… continuum mechanics. Grasstrees, however, have a discrete bark-like structure, making them particularly well suited for computational studies. In this thesis I present a model of grasstree development capturing both primary and secondary growth. A biomechanical model based on a mass-spring network …
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Lightweight concrete : investigations into the production of variable density cellular materials
… we put buildings together, not as assemblies of discrete elements but as monolithic yet malleable wholes.
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Reduced-order modeling of granular intrusions driven by continuum approaches
… of granular physics extensively uses grain-scale Discrete Elements Modeling (DEM) to model such characteristics of granular systems, they are computationally expensive. On the other hand, capabilities to model such systems in real-time are critical in numerous applications such as path planning …
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The greenhouse tomato industry in Delta, British Columbia
… of the process of ‘appropriation’. That is, the discrete elements of the agricultural production process have been appropriated by industrial capital and reassembled as a technologically intensive system of plant production. However, and using the case study, I illustrate how this process of …
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A lumped-parameter model of tire-terrain interactions for off-road vehicles
… development. This thesis aims at developing a discrete, lumped-parameter, physical model for capturing transient interactions between a deformable tire and a deformable terrain. Specifically, the model accounts for the radial and the tangential deformation in the tire as well as the normal and …
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Towards realistic interactive sand : a GPU-based framework
… rubble, and gravel. Allowing other environmental elements, such as trees or bodies of water, as well as players, to interact naturally and realistically with sand, is an important milestone for achieving realism in games. In the past, game developers have resorted to approximating sand with flat. …
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From Waste to Structure: A Deep Reinforcement Learning Approach to Circular Design
… by their non-standard and uniquely varied elements, are hard to design with due to the enormous quantity of possible combinations of even a few discrete elements. Identifying a feasible design that aligns with the designer's intent and meets functional requirements becomes an overwhelmingly …
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Discrete cellular lattice assembly
Robotic assembly of discrete cellular lattices at super-hertz (>1Hz) assembly rates is shown to be possible by integrating the design of a modular robotic assembler with the specified lattice topology such that the lattice can itself be removed from the incremental assembly process. Limits to …
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