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Showing 1 to 20 of 222 for “"Pinning"”.
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Pinning control of disease networks
… feedback control loops and applying open-loop pinning control to their nodes. Pinning control aims to medicate only a portion of an entire network in order to achieve the same outcomes that would be seen when all nodes are controlled. The control loops are simulated using networks ranging from …
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Flux pinning in superconducting Pb-Na
… The discussion is extended to consider flux pinning in the bulk and on the surface in the mixed state. The apparatus used to measure the a.c. flux penetration into a Pb-Na cylindrical single crystal is described together with the experimental techniques employed. The measurements of other …
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Interface pinning of CO₂ gravity currents
… and sharp corners. We show that interface pinning is caused by capillary pressure hysteresis, and the amount of pinning scales with the relative strength of capillarity relative to gravity, as measured by the inverse of the Bond number. We demonstrate that capillary pressure hysteresis in …
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Enhanced High-Field Flux Pinning in YBa2Cu3O7-x Thin Films Through Engineering of Ba2YTaO6 Artificial Pinning Centres
… is an understanding of the most effective pinning centre materials at low temperatures (10 K – 30 K) and high magnetic fields (B > 10T) for enhancing the critical current densities of these materials. This thesis investigates the effectiveness of the double perovskite material Ba2YTaO6 in …
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Superior pinning properties in nano-engineered YBa2Cu3O7-δ
… and morphological characteristic of the pinning landscapes produced are investigated and correlated to their effects on the superconducting properties of the thin films. In particular two pinning landscapes are investigated: Ba2YNbO6 nanorods are grown in YBa2Cu3O7-δ thin films using a …
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Barkhausen Noise Studies: Pinning Field Statistics and Time-Asymmetries
Finally, returning to pinning field statistics, a comparison of the length-scales involved in avalanche size distributions, temporal Barkhausen power spectra, and spatial pinning field power spectra illustrates that the most recent justification for the statistics of the effective pinning field is …
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Barkhausen Noise Studies: Pinning Field Statistics and Time-Asymmetries
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-25T18:58:56Z No. of bitstreams: 1 Mills_Andrea.pdf: 2716911 bytes, checksum: 18527d85091ca97cc09ef8a3f81cc8b9 (MD5)
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Grain Boundary Pinning Approach for Manufacturing High-Strength Nanocrystalline Aluminum Alloys
Nanostructuring is a commonly employed method to improve the mechanical properties of metals and alloys, but its usage is limited due to the instability of nanocrystalline (NC) materials. To address this challenge, the current study employs doping techniques to obtain a stable NC structure. In the …
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Enhancement Of Magnetic Vortex Pinning by APCs with Coherent BZO 1D-APC/YBCO Interface
Strong magnetic vortex pinning is crucial for in-field high critical current density (Jc) sustaining applications. This pinning force can be realized by inserting artificial pinning centers (APCs) in high temperature superconductors (HTS) such as YBa2Cu3O7-x (YBCO). Unfortunately, a degraded …
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Dislocation Tunneling Through a Pinning Point in the Superconducting and Normal States of Aluminum
An attempt is made to explain the tunneling suppression in the normal state data in terms of the Calderia-Leggett theory. However, using our best estimates of the relevant parameters, the calculated influence of the viscosity seems to be smaller than observed. The origin of this discrepancy is …
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Dislocation tunneling through a pinning point in the superconduction and normal states of aluminum
Submitted by Megan Hayes (mohayes2@illinois.edu) on 2012-05-10T20:35:20Z No. of bitstreams: 1 1998_mckay.pdf: 2902802 bytes, checksum: 39a93245d1ab888b701dbb41d2d22c33 (MD5)
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Transport properties and modification of the flux pinning in single crystal bismuth cuprate superconductors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Design and development of an automated pinning machine for the surface mount electronics industry
… describes the development of a concept for a pinning process and the associated machinery to handle odd-form pins specific to a company in the surface mount electronics industry. The developed pinning machine will reduce manual labor requirements, increase flexibility over current automated …
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The two-dimensional vibrating reed technique: a study of anisotropic pinning in high-temperature superconductors
In this work the anisotropy of the pinning forces of vortices in a-b plane of high temperature-supraconductors was examined. For this purpose vibrating reed with two degrees of freedom of the oscillation was constructed. The pinning forces were examined in single crystals of YBa2Cu3O7 and …
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An Investigation of the Structure, Pinning and Magnetoresistance of Domain Walls in Ni81Fe19 Planar Nanowires
… confinement on domain wall (DW) structure and pinning behaviour in nanowire structures. The out-of-plane structural properties of thermally evaporated Ni81Fe19 thin films on pre-oxidised silicon substrates have been investigated using x-ray scattering techniques and transmission electron …
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Outcomes after percutaneous leverage reduction and pinning for irreducible metaphyseal fractures of distal radius in children
… a small osteotome and fixed with percutaneous pinning to treat irreducible fractures. HYPOTHESIS: Percutaneous leverage reduction with pinning shows low failure rate and satisfactory clinical and radiologic results. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: Fifty-three children …
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Clinical outcomes following reduction and pinning of lesser arc injuries without repair of the scapholunate interosseous ligament
… method which includes closed reduction and pinning alone without repair of the scapholunate interosseous ligament. We propose that the majority of patients will obtain good function and pain scores and the few that develop instability may still have a reconstruction performed through a naïve …
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An X-ray study of charge-density-wave pinning and a measurement of the thermal conductivity in blue bronze
… the primary experiment reported in this thesis, pinning of the CDW phase by lattice imperfections was examined. Pinning determines most of the dynamics of CDW systems and can be characterized by a phase coherence length L. Pinning sites were introduced into blue bronze by electron irradiation, …
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