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 326 for “"4D"”.
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4D printing : towards biomimetic additive manufacturing
… to external constraints through adaptation, "4D printing" addresses additive fabrication of artifacts with one or more additional design dimension, such as material variation over distance or direction and response or adaptation over time. This work presents and evaluates a series of enabling …
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4D Study of Thoracic Cancer Radiation Treatment
… used to accomplish this goal. The application of 4D CT imaging to radiotherapy treatment planning is an active area of research with the goal to reduce the required normal tissue irradiation and improve the tumor coverage. Deformable image registration holds the key to link the information of two …
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4D CT based analysis of knee kinematics
… knee kinematics.;Aims: Utilise the innovative 4D CT scanners to capture the articulation of healthy and replaced knees. Develop a bespoke proof-of-concept software which utilises the 4D CT data and extracts three principal kinematic outcome measures. Extract the kinematics of ten participants …
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Language-Guided 4D Object Reconstruction from Videos
Creating 4D assets from real-world data is a crucial problem in computer vision, with applications in Augmented Reality (AR), Virtual Reality (VR), and animation. However, this task is often cost-prohibitive, as it requires both detailed object 3D structure and accurate motion within a complex 3D …
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3D and 4D Modeling of Ignimbrite Eruptions
<p>The need to model the Yellowstone magma chamber and other possible sites for ignimbrite eruption has been accelerated by the development of the areas surrounding the volcanoes. Early detection of eruptions is the most important aspect when trying to reduce casualties from an eruption. The magma …
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RAFT Polymer Networks as a 4D Platform
… by studying their behaviour and finding novel 4D transformations and other techniques. In doing so, I undertook a number of different projects, each exploring a different aspect of LPNs. This begins by studying the effects of RAFT agent symmetry on the growth behaviour of LPNs. RAFT agent …
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4D Printing Shape Memory Polymers for Biomedical Applications
<p>The development of 3D printing techniques using shape-memory polymers (SMPs) hascreated potentials for creating dynamic, three-dimensional structures that can be produced rapidly and be customized for specific and complex architectures. These qualities have made 3D printing a popular fabrication …
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Segmented breast treatment planning incorporating 4D data acquisition
Conventional 3-D external beam radiation therapy for breast cancer, although a vast improvement over traditional therapy, does not take into account respiratory motion. With breast cancer patients, this motion can expose healthy tissues, such as the lungs, to higher doses than expected. More …
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A framework for developing 4D LOD on construction projects
… has facilitated an increase in the use of 4D (3D+Time) simulations of construction projects. Numerous studies have acknowledged the benefit of 4D models in project planning and construction phases, enhancing communication between construction teams and avoiding unforeseen conflicts during …
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A 4D photogrammetric system for studying flow-like landslides
… granular flows as time-series three-dimensional (4D) point clouds, producing high-quality digital datasets of laboratory landslide experiments. The software incorporates a robust tracking algorithm, enabling the calculation of flow velocity vectors at the single-particle or grain scale with high …
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Modeling and editing 4D scenes by leveraging structural priors
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Characterize the molecular dynamics of materials for 4D printing
4D printing is a nascent field that is foundational for fabrication of complex 3D objects with programmable, temporal attributes that undergo exceptional configuration changes of the 3D structure. While gel-based composite inks are at the crux, the lack of a foundational, materials chemistry …
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Flow velocity measurement in haemodialysis access using 4D MRI
Treatment of renal failure while awaiting transplant requires vascular access, which comes with both complications and failure rates. In order to improve this, information about the AVF or AVG itself, as well as the haemodynamics is required. This data will then be used for computer modelling …
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Evaluation of Artifacts In Experimental Cine 4D Ct Acquisition Methods
<p>Four-dimensional computed tomography (4D CT) has increased the accuracy of radiation treatment planning for patients in whom the extent of target motion is large. 4D CT has become a standard of care for radiation treatment simulation, allowing decreased motion artifacts and increased …
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Chaotic transport by a turnstile mechanism in 4D symplectic maps
… investigations as it is a generic example for 4D symplectic maps. At first, we visualize resonance channels in phase space revealing their highly non-trivial geometry. Secondly, we study the transport away from such channels. This is governed by families of hyperbolic 1D-tori and their stable …
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Hands in action: from 4D reconstruction to animation and robotics
… prediction. In this work, we propose methods for 4D reconstruction of hands, objects and contacts from large-scale everyday videos, extending beyond controlled lab settings. This involves two main insights: (1) 2D information, such as segmentation masks and keypoints, can be estimated effectively …
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Simulating the cell cycle of the minimal cell in 4D
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Design and evaluation of neuroregenerative properties of 4D hydrogel scaffolds
… increasing functionality towards next generation 4D scaffolds for nerve reconstruction in vitro or nerve regeneration in vivo. The first takes advantage of cell-extracellular matrix interactions and presents an extracellular matrix (ECM)-mimetic surface treatment which, combined with DIW scaffolds …
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4D mapping of network-specific pathological propagation in Alzheimer's disease
… networks to A[beta] deposition. Importantly, the 4D nature of the map reveals that subcortical nodes and white matter tracts of the Papez memory circuit exhibit unique, early vulnerability to A[beta] aggregates. Finally, using large-volume labeling approaches, I confirm the molecular findings by …
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