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 579 for “"filaments"”.
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On the depolymerization of actin filaments
… cells. The globular protein assembles into long filaments, which form a variety of different networks within the cytoskeleton. The dynamic reorganization of these networks - which is pivotal for cell motility, cell adhesion, and cell division - is based on cycles of polymerization (assembly) and …
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Conformations of semiflexible polymers and filaments
… of semiflexible polymers, such as DNA, actin filaments and carbon nanotubes, strongly depend on their rigidity. Semiflexible polymers are characterized by their persistence length, the definition of which is the subject of the first part of this thesis. Attractive interactions, that arise …
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Optical Filaments and Gas Dynamics in Air
… the generation and persistence of optical filaments propagating over many Rayleigh lengths in air. These theories include wave-guiding model, moving focus model, dynamic spatial replenishment model and conical wave model. However, these models fail to capture the gas dynamics that arise …
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Fabrication of PLA-hemp 3D printing filaments
… The methodology involves fabricating composite filaments from 2 mm PLA pellets and 0.4 mm hemp fiber particles. Hemp fiber at varying weight ratios (5 wt%, 10 wt%, and 15 wt%) was extruded using a single screw extruder. The optimal ratio was determined among these blends for maximum tensile and …
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Melt Spinning of the Fine PEEK Filaments
The production of fine filaments using the melt spinning process needs considerable effort. A thermoplastic melt is stretched from the spinneret under a constant take-up speed. The high performance thermoplastic PEEK is solidified in the melt spinning process in a small distance and short time. …
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The properties of galaxies in supercluster filaments
… structures in the form of a network of filaments, and can be up to 100h\(^{-1}_{100}\) Mpc in extent. In this dissertation, we investigate in detail the spatial structure of the three richest superclusters of galaxies closer to us then z=0.1. We investigate the rate of star formation in …
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Core-shell printing of functional polymer filaments
… shell ink, it is possible to print continuous filaments of a Newtonian liquid core without leakage or droplet breakup. This technique is applied to enable the printing of optical waveguides of the commercial photopolymer OrmoClear using a sacrificial shell of an aqueous solution of the block …
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Filaments : lightweight network interfaces for embedded devices
Filaments are low-cost interfaces for attaching devices to an Ethernet network. While most networking research pushes for faster high-end systems, the filament project targets low-end devices with the goal of making networking easy. Filaments wrap the complexity of the network into a simple and …
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Studies on the dynamics of limited filaments
A study on the dynamics of filaments in the presence of a diagnostic, conductive limiter is presented. Plasma filaments are coherent structures present in many fusion devices and transport a significant amount of particles and energy to vacuum chamber walls. The theories of filament propagation are …
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The dynamics of moving filaments and tapes
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1968.
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DNA Origami-Templated Synthesis of Semiconducting Polythiophene Filaments
Die Herstellung funktionaler und strukturell wohldefinierter Nanostrukturen ist eine Voraussetzung, um hochentwickelte Device im Bereich der Nanoelektronik oder Nanooptik zu entwickeln. Bottom-Up-Verfahren, welche auf biomolekularen Selbstassemblierungsprozessen basieren, haben sich hierfür, …
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Buckling instabilities of semiflexible filaments in biological systems
… Zunahme der mittleren projizierten Länge des Filaments in Richtung der wirkenden Kraft führen. Als Funktion der Konturlänge des Filaments besitzt die mittlere projizierte Länge eine Spitze an der Knickinstabilität, die durch thermische Fluktuationen abgerundet wird. Unser Hauptresultat ist die …
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Non-equilibrium dynamics of adsorbed polymers and filaments
… dynamics of polymers or biological filaments adsorbed to two-dimensional substrates. The first part is dedicated to thermally activated dynamics of polymers on structured substrates in the presence or absence of a driving force. The structured substrate is represented by double-well …
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Active filaments and hydrodynamic interactions in microscale propulsion
… split into two parts: (i) the role of active filaments in microscale propulsion and (ii) hydrodynamic interactions between model microswimmers and their environment, namely with external flows and rigid surfaces. Active filaments. Active, slender filaments are ubiquitous in the micro-scale …
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Observational analysis of the compositional variation in solar filaments
Solar filaments have long been associated with coronal mass ejections and Space Weather phenomena. Filaments are dynamcal, and changes in their overall mass or its distribution could trigger an eruption. However, a comprehensive study of the elemental composition, abundance, and dynamics in a …
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Development of bio-composite filaments for drinking straw application
… focuses on manufacturing different bio-composite filaments and characterizing properties related to drinking straw’s functionality of strength and moisture absorption according to standardized material testing protocols. By deriving the mathematical models of these properties as a function of …
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Diverse Roles Of Nuclear Intermediate Filaments In Proliferating Cells
… the contrasting role of two nuclear intermediate filaments - Lamin A and Lamin B1 in the proliferating cells of embryonic hearts and cancer. Lamin B1 is upregulated together with proliferation genes in at least 15 cancers curated in The Cancer Genome Atlas (TCGA), whereas Lamin A trends align with …
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Dynamics of filaments, flares and coronal mass ejections (CMEs)
… hemispheric chirality preferences of quiescent filaments is confirmed; (5) the geoeffectiveness of halo CMEs is found to be associated with the orientation and the chirality of the magnetic fields associated with the eruptions; (6) the temporal correlation between the magnetic reconnection rate …
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