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 27 for “"flux measurement"”.
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Experimental surface heat flux measurement in hypervelocity flows
Prediction of heat transfer is integral to development of hypersonic vehicles. Underprediction of heat transfer rates can result in catastrophic failures during flight testing. An example which illustrates the importance of heat transfer during hypersonic flight is the destruction of the space …
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Magnetic flux measurement of superconducting qubits with Josephson inductors
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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High Temperature Heat Flux Measurement: Sensor Design, Calibration, and Applications
… and implementation of a high temperature heat flux sensor for thermal systems research and testing. The High Temperature Heat Flux Sensor (HTHFS) was designed to survive in the harsh thermal environments typically encountered in hypersonic flight, combustion and propulsion research, and …
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Critical assessment of the MEDUSA gamma ray detection system for radon flux measurement on a tailings dam
Worldwide measurement of radon flux on mine tailing dams has been performed using various instruments. Some of the methods used in South Africa are electrets, alpha tracks, accumulator cans etc. Although these techniques and methods have been used for many years, a number of shortcomings are still …
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Biosphere-Atmosphere Exchange of Peroxyacetyl Nitrate: Development of a Flux Measurement System and its Application on a Grassland Ecosystem
… ecosystems is not clear. This thesis presents a measurement system designed for the determination of biosphere-atmosphere exchange fluxes of PAN. The system was applied on a natural grassland ecosystem with the focus on the performance of the flux measurement system, but also with the aim to …
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Design of a multi-sensor platform for integrating extracellular acidification rate with multi-metabolite flux measurement for small biological samples
To view the abstract, please see the full text of the document.
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Convective Heat Flux Sensor Validation, Qualification and Integration in Test Articles
… of this study is to quantify the effects of heat flux sensor design and interaction with both test article material choice and geometry on heat flux measurements. It is the public domain component of a larger study documenting issues inherent in heat flux measurement. Direct and indirect heat flux …
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Precision measurement of electron and positron flux in cosmic rays with the AMS-02 Detector
The cosmic ray electron and positron flux measurement can address a series of astrophysics and particle physics questions. This thesis presents an analysis of electron and positron flux from 0.5 GeV to 1 TeV using the first 30 months of data taking( over 41 billion events), with the AMS-02 detector …
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Spatial variation of AMD related CO₂ emissions on reclaimed mine spoil
… understanding of the processes controlling the efflux of CO₂ from reclaimed mine spoils and evaluate the effectiveness of accumulation chamber (AC) flux measurement in identifying and delineating this hazard. AC measurements, isotope ratio mass spectroscopy, and statistical techniques were applied …
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Design and calibration of a rapid-response thin-film heat flux gage
A local heat-flux measurement system was built, calibrated and tested for use in unsteady flows. The system was designed to maintain constant wall temperature boundary conditions. The measuring element is a thin-film heat flux gage made by sputter-coating gold on a substrate. A constant-temperature …
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An assessment of Eddy Correlation technique in marine habitats
Oxygen production and oxygen flux play an important role in marine habitats and ecosystems. The eddy correlation (EC) technique is a key aquatic flux measurement technique to measure and calculate vertical turbulent fluxes within aquatic boundary layers without disturbing environmental …
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Evolution of the Stellar Mass Density of Galaxies Since Redshift 1.0
… spectral energy distribution, together with the flux measurement in one of the COMBO-17 filters in the optical regime delivers an estimation of the stellar mass for the galaxies in the survey. The stellar masses estimated in this way are used for an estimation of the stellar mass function and of …
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Condensation heat flux measurements in ambient conditions on superhydrophobic nanostructured surfaces
… a need has developed for heat transfer measurements through these superhydrophobic coatings as typical heat transfer calculations have been known to underestimate the total heat transfer. Here, I propose to measure the heat flux of a superhydrophobic, nanostructured surface without the …
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Control Designs for Low-Loss Active Magnetic Bearing: Theory and Implementation
… is proportional to the square of the magnetic flux, is still significant. For fficient operation, the flux bias, which is typically introduced into the electromagnets to improve the AMB stiffness, must be reduced, preferably to zero. This zero-bias (ZB) mode of operation cripples the classical …
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PURIFICATION AND CHARACTERIZATION OF THE JUNO LIQUID SCINTILLATOR: FIRST RADIOPURITY RESULTS
… NMO analysis and even more for solar neutrino flux measurement. For this reason, the scintillator purification strategy plays a key role in the preparation of the experiment. My PhD work has covered several crucial aspects of the JUNO project: before the begin- nig of the JUNO operations, I …
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Measurement and parameterisation of the air-sea CO2 flux in high winds
… instruments, including the autonomous air-sea flux system “AutoFlux” (Yelland et al., 2009) and an underway ?pCO2 system. An extensive set of direct, eddy covariance measurements of momentum, latent heat, sensible heat and CO2 flux was obtained over a wide range of open ocean conditions. The …
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TOF-based diagnostics system development and Geant4 simulation of the ELIMED transport and dosimetry beam line for high energy laser-driven ion beam applications @ ELI Beamlines
… be used for shot-to-shot energy distribution and flux measurement. Considering the high-energy laser-driven ion beams that will be delivered at ELIMAIA, a new analysis procedure, optimized for high-energy laser-driven proton beams, to extract the energy distribution for a given in species from the …
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CO₂ and Heat Release from Magmatic Hydrothermal Systems: Insights from CO₂ Flux and Other Modern Methods
… areas of steam heated ground. Ground based heat flux and CO2 flux surveys typically result in 100’s or 1000’s of individual flux measurements. These datasets are usually integrated to provide measures of total flow for the surface area under investigation (i.e. total heat flow, total CO2 flow). …
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Multidisciplinary research in Raman spectroscopy, phase imaging and their applications in heat transfer
… has been made in temperature probe, heat flux measurement and thermophysical properties characterization especially for solid-state materials and structures, precision thermal characterization is still challenging due to the presence of multiphysics coupling, the limitation of resolution …
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Development of a Direct-Measurement Thin-Film Heat Flux Array
A new thin film heat flux array (HFA) was designed and constructed using a series of nickel/copper thermocouples deposited onto a thin Kapton® polyimide film. The HFA is capable of withstanding temperatures up to 300 °C and produces signals of 42 μV/(W/cm²). As a result of its thin film …
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