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 98 for “"freestanding"”.
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Characterization of the mechanical properties of freestanding platinum thin films
Many MEMS devices utilize nanocrystalline thin metallic films as mechanical structures, in particular, micro switching devices where these films are used as Ohmic contacts. But the elastic and plastic properties of these thin films (thickness < 1μm) are significantly different from those of the …
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Integration of freestanding polyelectrolyte multilayer membranes in larger scale structures
… The second concept is the transfer of flat freestanding multilayer membranes to structured surfaces. We have developed a method that allows us to couple mm2 areas of defect free film with thicknesses down to 50 nm to structured surfaces and to avoid crumpling of the membrane. We could again …
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Peripheral Nervous System Modulation with Wireless Cellular Sized Freestanding Injectable Devices
Designing novel neural interfaces is essential for various medical applications, scientific research, and human augmentation. One of the foundations of neural interface and bioelectronic medicine is the electrical stimulation of excitable cells, to interface the body with electronics and treat a …
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Nanoscale Manipulation of Pristine and Functionalized Freestanding Graphene Using Scanning Tunneling Microscopy
… not interacting with a substrate but is instead freestanding. In this work I demonstrate that pristine and functionalized freestanding graphene can be imaged using a scanning tunneling microscope (STM) and that imaging a flexible 2D surface is fundamentally different from imaging a bulk material …
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Grafting polymers on nanosheets : a route for the fabrication of freestanding polymer brushes
… of up to tens of micrometers. Fabrication of freestanding homogenous and patterned polymer brushes is of great interest for both scientific studies and industrial applications. These materials may find a broad range of applications in many surface-based technologies. We developed a new …
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A Novel Method for Testing Freestanding Nanofilms Using a Custom MEMS Load Cell
Following fabrication, membrane thickness was measured using several methods, including: profilimetry, Scanning Electron Microscopy, and custom spectrophotometry. The mechanical properties of several membranes were measured using the apparatus, including membranes of gold, single crystal silicon, …
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Freestanding public toilet design and location in Boston and Cambridge : a comparative case study
… States via a comparative case study of the freestanding public toilets in Boston and Cambridge. The research attempts to capture the influence of municipal institutions and local actors on public toilet design and location, and further attempts to assess to what degree the resulting design …
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A Comparison of Certified Nurse-Midwives in Two Locations: The Freestanding Birth Center and the Hospital
The analyses of the birth certificate data show that all medical procedures have a higher likelihood of being used in hospitals than in FSBCs. Despite these significant differences in the use of medical technology across work location, the insights garnered from the interviews imply that midwives …
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Constrained sintering of gold circuit films on rigid substrates
… gold paste on rigid alumina substrates, while freestanding films were obtained by carefully peeling off gold films from the substrates after binder burn-out. Optical techniques were developed to determine the densification kinetics of the constrained and freestanding films at temperatures below …
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Experimental Investigation into the Long-Term Seismic Performance of Dry Storage Casks
… length anchors and the biaxial shake table. Five freestanding cask experiments were conducted using the 6DOF shake table. The 0.39 and 0.62 aspect ratio casks had a scale of 1/3.5, while the 0.43 and 0.56 aspect ratio cask had a scale of 1/2.5. During the shake table experiments, casks exhibited a …
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Laser Processing of Polyimide on Copper
… number of pulses. The processed samples include freestanding Kapton with no adhesive layer, freestanding Kapton with an adhesive layer, and Kapton with adhesive layered on copper. The laser processing used a single laser shot with the parameters being varied over a series of shots fired. The …
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Remote Epitaxy by In-Situ Grown BN and InGaN Strain Relaxation
… size increases, lift-off methods for fabricating freestanding compound semiconductors are developed. In 2017, a layer transfer technique based on remote epitaxy was introduced to overcome the drawbacks of conventional lift-off methods. By inserting a layer of 2D material between the epitaxial …
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Assessing the Efficacy of Learning Communities at Four North Texas Community Colleges.
… among students in learning communities and freestanding classes. Learning communities are gaining nationwide popularity as instruments of reform in Higher Education. Recent studies have discussed the benefits of learning communities to student, faculty and institutions. As learning …
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Design, Fabrication, and Characterization of an Array of Graphene Based Variable Capacitors
… thermal conductivity, and extreme flexibility. Freestanding graphene membranes naturally possesses an intrinsic rippled structure, and these ripples are in constant random motion even room temperatures. Occasionally, the ripples undergo spontaneous buckling (change of curvature from concave to …
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Carbon nanosheets and their applications
… electron microscopy (TEM) grids, large freestanding membranes with the thickness of one monolayer were obtained with an aspect ratio of up to 1:225000. This way, for the first time, the bottom side of the nanosheet became accessible for functionalization, and it was possible to …
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Plasmonic Optical Sensors: Performance Analysis and Engineering Towards Biosensing
… on-chip sensors, plasmonic optical fibers and freestanding nanomembranes. (1) Periodic nanohole arrays are patterned on chip by a simple and robust template-transfer approach. A spectral analysis approach is also developed for improving the sensor performance. This sensor is applied to …
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Two-Dimensional Vibrations of Inflated Geosynthetic Tubes Resting on a Rigid or Deformable Foundation
… equilibrium and vibration analysis of a freestanding geosynthetic tube is executed. Air and water are the two internal materials investigated. Three foundation variations are considered: rigid, Winkler, and Pasternak. Mathematica 4.2 was employed to solve the nonlinear equilibrium and …
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Direct Ink Writing of Functional Fiber/Granular Composites
… matrix impregnation, interfacial bonding, and freestanding deposition is difficult to achieve during printing. For granular composites, stable particle flow, controllable packing, binder infiltration, and shape retention are strongly affected by particle interactions and process conditions. …
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Optimising the axial ratio bandwidth of resonant linear to circular polarisation converters
… of suitable unit cell dimensions. Embedding the freestanding slot array between identical dielectric slabs introduces an additional freedom when designing the transmission mode polarisation converters. The performance is shown to be strongly dependant on the thickness and permittivity of the …
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