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 29 for “"Flow regulation"”.
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Integrated Microvascular Flow Regulation and the Impact of Metabolic Disease
… oxygen, adenosine (metabolism) and intralumenal flow). Predictive machine learning models determined which factors were most influential in controlling the diameter and rate of arteriolar responses. Sympathetic and metabolic influences were shown to be the most robust and stable in the proximal …
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Nonlinear springs with applications to flow regulation valves and mechanisms
… the application of nonlinear springs for fluid flow control valves where geometric constraints, or fabrication technologies, limit the use of available solutions. Types of existing nonlinear springs are discussed and categorized as either, single element springs or springs relying on external …
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Celiac Blood Flow Regulation, Acid-Base Balance and Production in Heat-Stressed Cockerels (Cate Cholamines)
… absorption by reducing gastrointestinal blood flow.
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Vascular Reactivity by Blood Oxygen Level Dependent Functional MRI in Cerebral Amyloid Angiopathy: Comparison with Alzheimer's Disease and Assessment of Longitudinal Change
… toxic to smooth muscle cells and impairs blood flow regulation. Reduced blood oxygen level dependent (BOLD) signal amplitude in response to a visual fMRI task has recently been implicated as a surrogate marker for impaired vascular reactivity in CAA. There have been no studies investigating how …
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Drag coefficients on razor clams in slightly fluidized granular media
… to a pump with an attached ball valve for flow regulation is constructed which allows testing of drag force in conditions similar to that the clam experiences, as well as in an environment void of wall effects. Testing is done using a dead clam attached to a stainless steel rod which is …
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Relation of Missouri river flows to sandbar morphology with implications for selected biota
Channel modification and flow regulation in historically braided large rivers, have reduced sandbars and associated highly productive habitats for riverine biota. Sandbars are an important interface between aquatic and terrestrial environments, i.e. an aquatic-terrestrial zone (ATTZ), within the …
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Methodology for Zero-Cost Auto-tuning of Embedded PID Controllers for Actuators: A Study on Proportional Valves in Micro Gas Chromatography Systems
… GC systems, and require precise temperature, flow and pressure control for the micro-fabricated preconcentrators and micro columns. PID controllers are widely used in process control applications due to their simplicity and effectiveness. The Commercial Off The Shelf (COTS) available …
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Targeting S1PR3 to mitigate flow-enhanced invasion in the glioblastoma tumor microenvironment
… has implicated pathological interstitial fluid flow, created by high intratumoral pressure relative to the healthy parenchyma, in enhancing cancer invasion. Multiple targetable molecular pathways have been identified that drive this response, but the specific pathways employed by invasive cells …
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Retinal Ischemia in the In Vivo Rodent: Cellular and Vascular Characteristics
… and cellular effects of acute loss of blood flow have not been investigated fully, and current treatments only address secondary complications of ischemic damage. This work has developed new tools with which to investigate retinal blood flow and glial Ca2+ signaling in health and disease. …
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Assemblage structure and shallow-water habitat use by small-bodied fishes at lower Missouri River sandbars
… fishes have declined since channelization and flow regulation contributed to losses of shallow-water habitat (SWH) on lower Missouri River (LMOR). Existing point and wing-dike sandbars represent a potentially important source of SWH to fishes during early ontogeny within the main channel of …
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The provision of ecosystem services at the local scale along a rural-urban gradient : a case study of a typical UK metropolitan city
… and mitigation, airquality control, water flow regulation, biodiversity, pollination, and noise buffering services),and has created a new analytical tool to quantify them in non-economic terms at the localscale. The tool was applied to 69 sites of 0.25km2 along a rural-urban gradient within …
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The Effects of Ethynodiol Diacetate on Epinephrine-Treated Glial-Derived Cells
… that play roles in synapse development, blood flow regulation, extracellular homeostasis, synapse function, energy and metabolism (Sofroniew and Vinters, 2009). Research using astrocytes in cell viability studies can be beneficial in deepening our understanding of specific neuroprotective …
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Cellular mechanisms of acute hypoxic pulmonary vasoconstriction in intrapulmonary veins.
… alveolar hypoxia contributes to blood flow regulation. Hypoxic pulmonary vasoconstriction (HPV) involves both pulmonary arteries and veins, but little is known of the contractile mechanisms specific to the veins. The aim of these studies was to examine the hypoxic response in small …
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SUCCESSION OF ARBUSCULAR MYCORRHIZAL FUNGI: CAUSES, CONSEQUENCES, AND CONSIDERATIONS
… These findings are important to floodplain regulation and management strategies as they suggest that flow regulation that limits early site formation will limit the ecosystem contributions of AMF on dammed rivers. Chapter 3 builds on the findings from chapter 2 to determine the mechanisms of …
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SUCCESSION OF ARBUSCULAR MYCORRHIZAL FUNGI: CAUSES, CONSEQUENCES, AND CONSIDERATIONS
… These findings are important to floodplain regulation and management strategies as they suggest that flow regulation that limits early site formation will limit the ecosystem contributions of AMF on dammed rivers. Chapter 3 builds on the findings from chapter 2 to determine the mechanisms of …
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Determination of Optimal Stable Channel Profiles
… schemes, and is useful when considering flow regulation. However, its applicability is limited in that its continuously curving boundary does not allow for sediment transport, which is an essential feature of natural rivers and streams. That model has thus been modified to predict the …
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Autoregulation of blood flow during sympathetic nerve stimulation in the arteriolar network on cat sartorius muscle.
Autoregulation is the tendency for blood flow to remain constant despite a change in arterial perfusion pressure. Flow regulation is achieved by adjustment of arteriolar caliber to the pressure change. The responses of arterioles are most commonly explained by either the metabolic or myogenic …
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Fundamental studies of the PVD technique.
… problems with water vapour contamination and gas flow regulation are highlighted and possible solutions suggested.The coating-substrate interface region is considered, and the merits of metallic interlayers and arc etching are compared. An interlayer achieves good adhesion only at an optimum …
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Pericytes in Early Vascular Development
… assist in cell-cell communication and even blood flow regulation in the microvasculature. To study the relationship between endothelial cells and pericytes during development, we observed vascular morphology in three and four dimensions, as well as the genetic and molecular mechanisms underlying …
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Development of a novel micropipette aspiration-based force sensing technique to measure single cell sliding friction
… such as in extravasation of leucocytes, blood flow regulation, and cell migration. In these cases, adhesion molecules on the cells form bonds with the substrate upon contact and when the cells propagate, the bonds are ruptured at an angle sustained by the cells’ curvature. The presence of …
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