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 10 of 10 for “"Relaxation Time Constant"”.
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Preserving hyperpolarised nuclear spin order to study cancer metabolism
… decay of the polarisation with the longitudinal relaxation time constant T1. This work aimed to improve the combination of hyperpolarisation and metabolic NMR/ MRI by extending the observation timescale of the technique. Working with quantum mechanical properties of the detected substrates, long …
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Assessment of Cardiac Function by Acoustic Radiation Force (ARF) Based Methods of Ultrasound Elastography
… had the potential to be a direct measure of the time-varying elastance measured during the cardiac cycle using pressure-volume measurements. The question arose as to whether these ARF based measurements of dynamic stiffness could be used for cardiac functional assessments during systole and …
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Low Frequency Dielectric Investigations on Hydrated Pharmaceutical Powders
… hydroxyl groups via extended chain motions. This relaxation is shown not to be due to proton conduction, or other ionic currents, by the effect of hydration with various solutions (including the effect of /?H, [D2O] and ionic strength). Additionally, particle size was found not to affect the …
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Eliminating critical slowing down in Monte Carlo calculations
… methods have been proposed to shorten the relaxation time and thereby, reduce CSD. These methods all modify site-by-site Metropolis and heat bath Monte Carlo to operate on larger spacial scales. One of these newer techniques is to apply multigrid methods to site-by-site Monte Carlo …
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Towards Mechanochromic Devices using Biocompatible Hydroxypropyl Cellulose
… solid-like (gel) state for the first time. Mouldable as a continuous unsupported solid, while retaining the shear-thinning non-Newtonian response of HPC, the mechanochromic relaxation time is enhanced over the equivalent HPC-water mesophase via an intrinsic elasticity provided through …
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Analysis, design, and fabrication of an electric induction micromotor for a micro gas-turbine generator
… very thick passivation. Second, the rotor charge relaxation time constant is adjusted using a moderately Boron-doped polysilicon conductor. Third, tethers are defined by a through-wafer etch to be 385 jim tall and only 8 jim wide. Finally, the stator and rotor wafer are to be fusion bonded at the …
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Sex dimorphism in the cardiometabolic effects of the smoothelin-like 1 protein deletion in an ageing mouse model
… blood pressure, end diastolic pressure, LV relaxation time constant (tau), and steeper end diastolic pressure-volume relationship. Unlike young males, the 3-month-old female KO mice did not develop diastolic dysfunction. However, ageing elicited progressive impairment of diastolic function …
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Electrooptic electric field sensor for dc and extra-low-frequency measurement
… were further characterised for the charge relaxation time constant to estimate their performance in DC field measurements. Crystals of Bismuth Germanate and Lithium Niobate were identified as suitable materials for the DC field sensor. The selected crystals were found suitable at …
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Nuclear Spin Relaxation and Diffusion Studies of Adsorption and Dynamics at the Catalyst-Liquid Interface
… chemicals and fuels from biomass. Nuclear spin relaxation time measurements have recently emerged as a novel tool for probing surface dynamics within such systems; herein, we detail the state-of-the-art of such measurements, and extend our current understanding of how such characteristics may be …
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Study of carrier and gain dynamics in InGaAsN quantum well lasers
… steady state photoluminescence (PL) and time evolution of PL spectra. The gain dynamics is obtained from the analysis of ultrafast pump-probe transmission measurement with selective pump and probe wavelengths. The experiments are complemented with theoretical model simulations of the gain …