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 108 for “"Force Measurements"”.
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AFM surface force measurements between hydrophobized gold surfaces
… Israelachvili and Pashley reported the first measurements of a hitherto unknown attractive force between two mica surfaces hydrophobized in cetyltrimethylammonium bromide (CTAB) solutions. Follow-up experiments conducted by many investigators confirmed their results, while others suggested …
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Radiation Force Measurements at a Water-Air Interface
Made available in DSpace on 2017-07-06T18:56:06Z (GMT). No. of bitstreams: 3 Sakai_Stacie_S_MS.pdf: 76086248 bytes, checksum: e0540c45c692350e3d23e8108c733cdb (MD5) Sakai_Stacie_S_MS_ABS.pdf: 989645 bytes, checksum: 17d42bef12b4a513913b2f4f40ea7f6e (MD5) license.txt: 4813 bytes, checksum: …
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Determination of Heterogeneous Equilibrium From Electromotive Force Measurements
Made available in DSpace on 2014-12-04T23:26:44Z (GMT). No. of bitstreams: 1 0018114.pdf: 2076607 bytes, checksum: d08d7e55b2b406e6cd51173b2f202fb8 (MD5) Previous issue date: 1956
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Penetration force measurements in the central nervous system with silicon electrodes
… the dimpling effect that is due to the insertion force. A method which can reduce the penetration force can also reduce dimpling and the resulting tissue damage. There are two objectives in this thesis. One is to measure the penetration force with Michigan electrodes, which are silicon based …
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Determination of force coefficients for racing yacht sails using actual force measurements
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1992.
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Direct Force Measurements on the Colloidal Scale: From Modified Electrodes to Particle Manipulation
In this thesis the interfacial surface forces and mechanical properties of thin films have been studied by the colloidal probe technique. One central point is the combination of direct force measurements with an electrochemical setup in order to tune interfacial properties of an electrode modified …
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Applications of Optical Manipulation for Low Cost Implementation, Beam Shaping and Biophysical Force Measurements
… the ability to quantitively exert and measure forces on the piconewton scale, a convenient force scale for soft biological materials, and are hugely versatile due to the wide assortment of beam shaping techniques that can be employed.<br/><br/>The work in this thesis can be broadly divided into …
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Wall Forces, Bulk Flow and Impact Speeds in a Vibratory Finisher: Modeling and Force Measurements
… particle density. Given the importance of wall forces in explaining the media behavior, a method for measuring wall-media contact forces was developed where a force sensor was embedded in the vibrating walls. Measurements revealed that wall forces were determined by the granular bed viscous …
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Hydrophobic Forces in Flotation
An atomic force microscope (AFM) has been used to conduct force measurements to better understand the role of hydrophobic forces in flotation. The force measurements were conducted between a flat mineral substrate and a hydrophobic glass sphere in aqueous solutions. It is assumed that the …
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Mechanism of C -Cadherin Binding: Multiple Adhesive Alignments and a Multi-Stage Unbinding Trajectory
… monolayers, that are used in the surface force measurements, is presented in the latter part of the thesis. Using ellipsometry, we monitor the binding of C-cadherin to lipid monolayers in real time. These data suggest that in the presence of calcium, cadherin forms adhesive complexes on …
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Studies of Thin Liquid Films Confined between Hydrophobic Surfaces
Surface force measurements previously conducted with thiolated gold surfaces showed a decrease in excess film entropy (£GSf), suggesting that hydrophobic force originates from changes in the structure of the medium (water) confined between hydrophobic surfaces. As a follow-up to the previous study, …
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Motility and Force Generation Based on the Dynamics of Actin Gels
This thesis explores the force generation of actin gels and their famous pro-pulsion mechanism leading to active motility on the cellular scale. In nature the generation of force and motility is regulated by actin binding proteins and the mesoscopic shape of the gel. Here we controlled an analyzed …
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Observing molecular interactions that determine stability, folding, and functional states of single Na+/H+ antiporters
… in humans. Here I applied single-molecule force spectroscopy to investigate molecular interactions determining the structural stability of the sodium/proton antiporter NhaA of Escherichia coli, which serves as a model system for this class of proteins. Mechanical pulling of NhaA molecules …
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Mechanism of the Neural Cell Adhesion Molecule and Mode of Polysialic Acid Adhesive Inhibition
Lastly, direct force measurements are presented on polysialylated NCAM proteins to determine the effects of polysialic acid on both NCAM and C-cadherin mediated adhesion. Results indicate that polysialic acid inhibits both NCAM and cadherin adhesion by increasing the intermembrane repulsion. This …
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Creating long-range hydrophobic forces by coadsorption of ionic and neutral surfactants
A Mark IV surface force apparatus was used to measure surface forces between mica surfaces in dodecylamine hydrogen chloride (DAHCI) solutions at pH 5.7 in the presence and absence of long-chain alcohols. With DAHCI alone, only "short-range" hydrophobic forces were observed with decay lengths of …
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Investigation of protein-protein interaction using atomic force microscopy
… of protein dissociation have the advantage that measurements can be performed in native environments, such as living cells, where concentrations of target molecules may be quite low. In addition, single molecule approaches allow for the measurement of variances in protein kinetics, thus providing …
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Development of In-Plane Compliant Bistable Microrelays
… characterization includes a treatment of a new force-tester, a preliminary contact resistance study, contact-force measurements, switching time measurements, insertion loss, AC isolation, breakdown voltage, and DC isolation. This document also includes recommendations for further research.
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Aerodynamic stability of oscillating bridges
… made regarding stability based on the static force measurements previously obtained.
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A reliable & autonomous robotic in-pipe leak detection system
… pipe. This phenomenon is translated into force measurements via a carefully designed and instrumented mechanical embodiment. In addition, an analytic dynamic model of the robotic detector is derived. Further study and analysis show that the proposed system can sense leaks at any angle …
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Distributed force model for arbitrarily shaped IMPC actuators
… an arbitrarily shaped artificial muscle to the force it produces does not currently exist for actuators made of ionic polymer-metal composites (IPMC), a type of electroactive smart material. The model in this thesis couples a finite element force simulation for IPMC with a novel method of …
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