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 54 for “"Mechanical stiffness"”.
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Mechanical Stiffness and Dissipation in Ultrananocrystalline Diamond Films
… diamond promising for high frequency micro/nanomechanical devices. We have measured the Young’s modulus (E), Poisson’s ratio and the quality factors (Q) for microfabricated overhanging ledges and fixed-free beams composed of UNCD films grown at lower temperatures. The overhanging ledges …
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Mechanical stiffness-defined matrices for stem cell research and drug screening
… and foster cell multiplication. By changing the stiffness of the substrate, human mesenchymal stem cell (MSCs) could be directed along neuronal, muscle, or bone lineages. Matrix elastic modulus can also control anchorage dependent cell's motility, localization, tissue formation and organization. …
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Analytical and Experimental Investigation of Interphase and Dispersion Effects on the Mechanical Stiffness of Cellulose Nanocomposites
… via solution casting method and tested for mechanical stiffness. These outcomes were compared to standard composite models as well as novel methods adapted from the literature that incorporate data regarding dispersion quality and interphase properties. The literature review verified that …
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Spatially-localized correlation of MRI and mechanical stiffness to assess cartilage integrity in the human tibial plateau
… is the use of a hand probe during arthroscopy. Mechanical probing, however, is invasive and requires anesthesia. Tightly confined areas of the articular surface can be difficult to reach and assess, and manual probing provides a subjective rather than a quantitative assessment of cartilage …
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Study of the effect of mechanical stiffness substrata, assembled with polyelectrolyte multilayer thin films, on biofilm forming staphylococcus epidermidis' initial adhesion mechanism
… and poly(acrylic acid) (PAA), to alter substrata mechanical stiffness, which was used to explore the response of biofilm forming staphylococci epidermidis. The formation of biofilms on medical device surfaces is currently responsible for a significant amount of infections acquired in hospitals. …
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Development and application of correlative STED and AFM to investigate neuronal cells
… between cytoskeletal reorganisation and cell mechanical stiffness. In order to improve understanding of this process, correlative measurements of cytoskeletal organisation and mechanical stiffness are required. To investigate astrocyte migration a technique combining atomic force microscopy …
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Characterization of composites with aligned carbon nanotubes (CNTs) as reinforcement
… of electrical, thermal, and especially mechanical properties make them ideal candidates for composite reinforcement. Nanocomposites and hybrid composite architectures employing traditional advanced composites and CNTs offer significant potential mechanical and multifunctional performance …
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The Reliability of Instrumented Knee and Ankle Orthopedic Special Tests Performed with A LigMaster™ Multijoint Arthrometer
… of clinical measures of joint laxity and mechanical stiffness. The LigMaster™ is a relatively new multijoint arthrometer that can be used to perform instrumented orthopedic special tests at the knee, ankle, shoulder and elbow. To date, few lower extremity studies have been conducted with …
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Polyelectrolyte multilayers incorporating photocrosslinking polymers for controlling 2- and 3-dimensional structure
… Properties such as thickness, swellability, mechanical stiffness, porosity (and by extention optical properties), and ability to adsorb small molecules are all controlled by the charge density of these polymers in the film and their resultant binding state. Patterning covalent binding through …
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The role of biofilms in Legionella pneumophila transmission in drinking water distribution system
… Biofilm properties (e.g., physical structure and mechanical stiffness) play an important role during this L. pneumophila transmission process. However, the knowledge on how the biofilm properties control L. pneumophila transmission and what factors in DWDS determine biofilm properties is still …
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Development of collagen-based scaffolds for differentiation of induced pluripotent stem cells
… proliferate and differentiate. However, lacking mechanical stiffness and shrinkage resistance made it a challenge to sustain shape and size during a long stem cell differentiation process. In addition, a cytocompatible scaffold for human induced pluripotent stem cell (iPSC)-laden culture has not …
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Conductive PEDOT:PSS fibres for modelling and assessing oligodendrocyte ensheathment
… fibres possess electrical conductivity and mechanical stiffness, mimicking the diameter of axons while facilitating electrical stimulation and real-time impedance measurements. Examination of Scanning Electron Microscopy (SEM) images reveals that oligodendrocytes adhere to these fibres, …
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Radiation pressure effects in a suspended Fabry-Perot cavity
… suspended as pendulums. A unified model of optomechanical coupling is presented, whereby a strong coherent laser field interacts with a classical harmonic oscillator. We show that such a system is well described using standard techniques from control theory. We measure the properties of an …
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Extreme energy absorption : the design, modeling, and testing of negative stiffness metamaterial inclusions
… materials that simultaneously display high stiffness and high loss factors for the creation of structural elements capable of passively suppressing vibro-acoustic energy. Relevant recent research has shown that it is possible to produce composite materials whose macroscopic mechanical …
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Design of multi-functional hydrogel for cell therapies
… and protection against harsh chemical and mechanical stimuli, and host immune system. In addition, chemical moieties, mechanical stiffness, and minerals presented in hydrogels act as insoluble signals to regulate a variety of cellular function. However, the conventional hydrogel design is …
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Progression of chondrocyte signaling responses to mechanical stimulation in 3-D gel culture
Mechanical stimulation of 3-D chondrocyte cultures increases extracellular matrix (ECM) production and mechanical stiffness in regenerating cartilage. The goal of this study was to examine the progression of chondrocyte signaling responses to mechanical stimulation in 3-D culture during tissue …
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Understand The Structure-Water-Responsive Relationship by Engineering Silk Materials
<p>Water-responsive (WR) materials mechanically swell and shrink in response to changes in relative humidity, and they have demonstrated the capability to exert higher actuation energy than conventional actuators and artificial muscles. As a result, WR materials have recently gained attention as …
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The nanogranular origin of concrete creep : a nanoindentation investigation of microstructure and fundamental properties of calcium-silicate-hydrates
… to the assessment of the microstructure and the mechanical stiffness, strength and creep properties of the fundamental building block C-S-H. This is achieved by extending the realm of classical indentation analysis of homogeneous solids to highly heterogeneous, linear-viscoelastic, …
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Topology Optimization of Multifunctional Nanocomposite Structures
… its local effective properties, including mechanical stiffness, electrical conductivity, and piezoresistivity. These local properties in turn drive global multifunctional performance objectives. A topology optimization algorithm determines the optimal distribution of CNTs within an epoxy …
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Nanomechanical and nanoelectromechanical phenomena in 2D-atomic crystals : a scanning probe microscopy approach
In this thesis we probe the morphological, nanomechanical and nanoelectromechanical properties of 2D materials: graphene, MoS2 and h-BN. Throughout this study we extensively use scanning probe techniques of ultrasonic force microscopy (UFM), direct-contact electrostatic force microscopy (DC-EFM) …
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