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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 200 for “"preconditioning"”.
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Preconditioning For Matrix Computation
<p>Preconditioning is a classical subject of numerical solution of linear systems of equations. The goal is to turn a linear system into another one which is easier to solve. The two central subjects of numerical matrix computations are LIN-SOLVE, that is, the solution of linear systems of …
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Preconditioning and augmented preconditioning via manipulation of metabolic and signalling pathways in the rat heart
Cardiac ischaemic preconditioning (IPC) describes a biological phenomenon whereby a short ischaemic stimulus confers protection to the heart against subsequent prolonged ischaemia and reperfusion injury. Understanding this survival programme will enable us to augment tissue tolerance against cell …
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ENHANCING EXERCISE PERFORMANCE THROUGH ISCHAEMIC PRECONDITIONING
Ischaemic preconditioning (IPC) is an intervention whereby brief intermittent ischaemic episodes are induced in a limb (usually 4x5-minute arterial occlusion bouts, interspersed with 5-minutes of reperfusion) either at the site of interest (IPC), or at a distance from the site of interest (Remote; …
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Polynomial Preconditioning for Conjugate Gradient Methods
… In this thesis we examine the use of polynomial preconditioning in CG methods for both hermitian positive definite and indefinite matrices. Such preconditioners are easy to employ and well-suited to vector and/or parallel architectures.
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Topographic preconditioning of open ocean deep convection
… negative buoyancy forcing. Topographic preconditioning of open ocean deep convection is studied using an idealized, three-dimensional, primitive-equation model. A barotropic mean flow impinges on an isolated Gaussian-shaped seamount in a stratified domain with uniform negative surface …
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Effects of Ischemic Preconditioning on Exercise Economy
<p>Ischemic preconditioning (IPC) is the application of small bouts of ischemia followed by reperfusion. IPC has shown to enhance exercise performance in varied sports like 5K running, cycling and swimming. However, effect of ischemic preconditioning on running economy have not be investigated so …
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Studies into Mg-preconditioning of brewer’s yeasts
This research was concerned with testing a hypothesis that brewer’s yeast cells, which were physiologically “preconditioned” with Mg ions, had improved fermentative output and stress tolerance. Ale and lager yeast cells preconditioned in the presence of elevated levels of Mg-actate, yielded highest …
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Preconditioning techniques for stochastic partial differential equations
This thesis is about preconditioning techniques for time dependent stochastic Partial Differential Equations arising in the broader context of Uncertainty Quantification. State-of-the-art methods for an efficient integration of stochastic PDEs require the solution field to lie on a low dimensional …
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Topographic preconditioning of open ocean deep convection
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Preconditioning methods for ideal and multiphase fluid flows
The objective of this study is to develop a preconditioning method for ideal and multiphase multispecies compressible fluid flow solver using homogeneous equilibrium mixture model. The mathematical model for fluid flow going through phase change uses density and temperature in the formulation, …
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Nanoparticle preconditioning for enhanced thermal therapies in cancer.
… lab. Previous work has demonstrated nanoparticle preconditioning of thermal therapies (heat and cold) by a single systemic injection of PEG-coated gold nanoparticles tagged with a vascular targeting agent (TNF-alpha). In addition, mechanistic studies have shown that 4 hour pre-treatment with …
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Incomplete factorization preconditioning for linear least squares problems
A new family of preconditioners for conjugate gradient-like iterative methods applied to large sparse linear least squares problems, $min\Vert Ax-b\Vert\sb2$, is proposed. The family is based on incomplete Gram-Schmidt (IGS) factorizations of A. Particular attention has been given to the following …
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Influence of Cardiovascular Risk factors on Remote Ischemic Preconditioning
… ischemia-reperfusion injury is remote ischemic preconditioning (rIPC), which triggers tissue protection by exposing a limb to small cycles of vascular occlusion. Animal models indicate that CVD risk factors reduce the protective benefits of ischemic conditioning. However, there are no human …
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Statistical Preconditioning and Quantitative Imaging for Electrical Impedance Tomography
Computational inverse problems frequently give rise to linear or nonlinear least squares problems, and if the problems are large, iterative solvers are typically the method of choice, with the Krylov subspace methods a frequently used family of iterative schemes. In the case of nonlinear least …
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The Effect of Ischemic Preconditioning on Rock Climbing Performance
… and causing ischemia-induced fatigue. Ischemic preconditioning (IPC) has been shown to improve time to failure (TTF) during climbing-specific tasks, though its mechanisms remain unclear. The purpose of this study was to assess the effects of IPC on hemodynamics and muscle oxygenation during a …
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Crotalus Snake Venom Preconditioning to Prevent Surgical Brain Injury
… are increasingly relevant to medical practice. Preconditioning, a preemptive therapy that administers mildly harmful stimuli to induce endogenous protective mechanisms before major injury, has been shown to minimize injury in many animal models. Given the elective nature of most neurosurgical …
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Ischaemic preconditioning in exercise and disease: One size fits all?
… effects. This mechanism is called ischaemic preconditioning (IPC). In this thesis, the impact of co-morbidity and age on IR-injury and IPC are explored. Moreover, the possible role of IPC to enhance exercise performance is investigated. Finally an attempt is made to understand the …
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New Sequential and Scalable Parallel Algorithms for Incomplete Factor Preconditioning
… iterative solvers on parallel computers. Preconditioning, which is the process of translating a linear system into a related system that is easier to solve, is widely used to reduce solution time and is sometimes required to ensure convergence. Level-based preconditioning (ILU(ℓ)) has long …
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