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Showing 1 to 20 of 276 for “"Quench"”.
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Quench dynamics and fiber optic quench detection of VIPER high temperature superconductor cable
… However, HTS introduces new challenges: slow quench propagation velocities (orders of magnitude slower than LTS) make quench events difficult to detect which increases risk of permanent damage to the magnet or loss of service if undetected. This thesis describes the test campaign, results, and …
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Quantum quench dynamics and entanglement
Quantum quench is a non-equilibrium process where the Hamiltonian is suddenly changed during the quantum evolution. The change can be made by spatially local perturbations (local quench) or globally switching to a completely different Hamiltonian (global quench). This thesis investigates the …
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Stability and quench protection of high-temperature superconductors
… as a possible mean for an early detection of a quench. For most of the experimental work reported here, we used "pancake" coils wound with coated YBCO conductor, the HTS of choice by those currently developing HTS-based electric power devices, though, YBCO itself to date is still in the …
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Spontaneous brillouin scattering quench diagnostics for large superconducting magnets
Large superconducting magnets used in fusion reactors, as well as other applications, need a diagnostic that can non-invasively measure the temperature and strain throughout the magnet in real-time. A new fiber optic sensor has been developed for these long-length superconducting magnets that …
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Momentum evolution numerics of an impurity in a quantum quench
A discussion on the momentum evolution of an impurity interacting via a finite delta potential repulsion with a non-interacting fermionic background gas is presented. It has recently been shown that the momentum evolution of this system displays two interesting features, namely a non-zero …
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Theory and modelling of quench in cable-in-conduit superconducting magnets
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Quench rate and aging effects in aluminum-zinc-magnesium-copper aluminum alloys
<p>"This work examines the effect of quench rate on the homogeneously and heterogeneously distributed precipitation occurring in Al-Zn-Mg-Cu commercial alloys, 7075 and 7050. Techniques used included hardness, conductivity and a differential scanning calorimetry (DSC) to understand and quantify …
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ALTERING THE AI-2 MEDIATED QUORUM SENSING CIRCUITRY TO QUENCH BACTERIAL COMMUNICATION NETWORKS
… mechanisms to the extracellular surroundings to quench the QS response of bacteria. Specifically we deliver the Escherichia coli AI-2 kinase, LsrK, to E. coli populations ex vivo and phosphorylate and degrade the extracellular AI-2. This significantly attenuates the native QS response in E. coli. …
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Two-dimensional quench propagation model for a three-dimensional "high-temperature" superconducting coil
Quenching is a thermal failure mechanism encountered with superconducting magnets. When a section of conductor is driven normal by an external heat input, the magnet transport current flows through a resistance, causing joule dissipation. If heat is not conducted away from the normal region faster …
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Political culture and water politics in Nevada: Las Vegas attempts to quench its thirsts
Today it is clear that the issue of water and its unavoidable scarcity in many areas has secured a permanent place on the public policy agenda. Certainly in Las Vegas, Nevada the rapid population growth, great economic development and extreme arid climate make the region vulnerable to the dangers …
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An Analysis of Quench Front Propagation During Bottom Reflood of a heated Annular Channel
Made available in DSpace on 2017-07-06T18:49:01Z (GMT). No. of bitstreams: 3 Kimball_Kevin_D_MS.pdf: 72010837 bytes, checksum: b7112f4e2ed4b67c6244fc6a2a074f9f (MD5) Kimball_Kevin_D_MS_ABS.pdf: 820094 bytes, checksum: e1c23063ac37846e1ce48a616c0f2a6e (MD5) license.txt: 4813 bytes, checksum: …
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Convective heat transfer model for determining quench recovery of high temperature superconducting YBCO in liquid nitrogen
Stability of a superconducting magnet is critical for reliable operation of a device in which the magnet plays a role. With the advent of high temperature superconductors (HTS), liquid nitrogen may be used to cool HTS devices. Yttrium barium copper oxide (YBCO), an HTS with critical temperature of …
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Analysis of various fuels in DISI and PFI engines : separating mixing effects from crevice and quench layer effects
… in the cylinder chambers and can be caused by quenching effects or poor mixing. A system was set up to determine the significance of mixing in producing high concentrations of UBHC. A GM 2009 LNF Ecotec was modified to run PFI and DISI under operating conditions representative of cold start for …
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Laser Induced Incandescence for Volume Fraction and Relative Particle Size Measurements in a Rich-Quench-Lean Jet A Combustor
… (LII) diagnostics inside a three-sector rich-quench-lean (RQL) aeroengine combustor running with Jet A fuel. First, the setup is described including details of the combustor, pressure vessel, data acquisition system, optics, and facilities. Then, the methodology for calibrating and estimating …
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Commissioning Of An Arc-melting/vacuum Quench Furnace Facility For Fabrication Of Ni-ti-fe Shape Memory Alloys, And The Characterization
… arc-melting facility and vertical vacuum quench furnace facility was commissioned to fabricate these alloys. The facility can create a vacuum of 10-7 Torr and heat treat samples up to 977 °C. High purity powders of Ni, Ti and Fe in varying ratios were mixed and arc-melted into small …
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Dynamics of Membrane Structure Formation in Quenched Polymer Solutions
… acetate [CA]/acetone/water. The effects of quench temperature and initial solution composition on the predicted structure-formation dynamics are elucidated. For the PMMA/NMP/glycerol system, model predictions agree well with real-time data obtained from light scattering measurements. …
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The control of participate emissions during production of coke
… from coke oven discharges, and from coke quenching. These are shown to have different spatial distributions, emissions from quench towers being very widespread, whereas emissions from oven discharges deposit relatively closer to the source. Methods to reduce both of these sources are …
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Measurement and analysis of bath-side interfacial concentration gradients during membrane quenching by phase inversion
… refractive index gradients during the quench step of membrane formation by phase inversion. From examination of individual Fourier components in a diffraction pattern associated with this one-dimensional mass transport process one is able to overcome the temporal and spatial resolution …
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The influence of visco-elastic processes on the generation of thermal stresses in quenched low alloy steel plates.
The visco-elastic effect in quenched specimens of 835M30 steel was described quantitatively by the use of the standard linear solid, which allowed the calculation of the thermal stress and strain during quenching in water, oil and in a martempering situation. The introduction of viscous flow into …
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