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 18 of 18 for “"Cyclic Variation"”.
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Reduction of propeller vibration and cavitation by cyclic variation of blade pitch.
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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An Experimental Study of Two-Stroke Cyclic Variation and a Prototype Component Design for Controlled Auto Ignition.
… of the emissions problems inherent with poor cyclic stability. In the early 1990s Honda Motor Corporation [60-67] introduced the concept of Controlled Auto Ignition to address the poor cyclic stability conditions but cost and complexity of the technology and an industry preference for 4-stroke …
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Backscatter and Attenuation Characterization of Ventricular Myocardium
… quantified by their magnitude and time delay of cyclic variation of myocardial backscatter. The results were analyzing using Bayes Classification and ROC analysis to quantify potential advantages of using a combination of two features of cyclic variation of myocardial backscatter over using only …
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Physics of ultrasonic wave propagation in bone and heart characterized using Bayesian parameter estimation
… A novel piecewise linear model for the cyclic variation of ultrasonic backscatter from myocardium was proposed. Models of cyclic variation for 100 type 2 diabetes patients and 43 normal control sub jects were constructed using Bayesian parameter estimation. Parameters determined from the …
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Cyclic deformation of a clay
… Mean effective stress, which showed negligible cyclic variation, decreased progressively during dynamic loading except that for over-consolidated soils it increased during the first cycle only. Progressive reduction of peak shear stress and specific damping energy was closely related to the …
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Endocrine markers of ovarian function: Clinical and biological aspects with focus on Anti Müllerian hormone
… was firstly to explore the age-related circadian variation of AMH in normally ovulating women and patients with Polycystic Ovarian syndrome (PCOS) and its relation to gonadotropin secretion; secondly to explore the inter- and intra-cyclic variation of AMH related to the number of antral follicles …
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Investigation of heart rate variability during sleep apnea
… nervous system, with prominent heart rate variation. It can be assumed that during sleep, internal influences (sympathetic and parasympathetic nervous system activities) dominate the autonomic nervous system; in addition repetitive apneas are accompanied by a pronounced increase in average …
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Enhancing Nonlinear Ultrasonic Methods for Laboratory and Clinical Applications
… contributing to the observed systematic variation of backscattered ultrasonic energy from the heart over the heart cycle. Studies were performed to address the reliability of the methods of measurement used for the quantitative characterization of nonlinear phenomena and to explore the …
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Novel model of cerebrospinal fluid dynamics based on hemodynamically driven cyclic brain compliance variation
… CSF circulation. This mechanism is based on a cyclic variation of brain compliance, dependent on the blood volume inside the brain vessels. As the cardiac cycle changes the blood volume inside the vessels, it also conditions a compliance cycle of the brain tissue. For better comprehension of …
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Contrast sensitivity and emotion recognition across the menstrual cycle
… hormones associated with the menstrual cycle. Cyclic shifts in female mate preferences, facial recognition and low-level visual processing have been attributed to such hormonal variations. The cycle shift hypothesis posits that such systematic shifts in female perception provide an …
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Laser shadowgraph study of early flame propagation in swirling flows near the lean misfire limit.
… location for different swirl levels because of cyclic variation; even though the average is higher for higher swirl level. The specific rate of growth of flame area (${1\over A}{dA\over dt}$) is obtained using three models for flame area A: (i) 2-D flame area $A\sb{f}$ measured from the …
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Diluted Operation of a Heavy-Duty Natural Gas Engine - Aiming at Improved Effciency, Emission and Maximum Load
… throttle losses. A new method for calculating cyclic variation was developed that significantly improved the transient capability of the engine control system. The method consequently applied on a closed-loop dilution limit control. Only applying closed-loop control to operate the engine at its …
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IMPACT OF INDOOR AIR POLLUTION ON INFLAMMATORY BIOMARKERS AND CARDIAC AUTONOMIC CONTROL IN HEALTHY SUBJECTS AND PATIENTS WITH CONGESTIVE HEART FAILURE (APICE STUDY)
… to a predominance of the sympathetic branch. Cyclic variation of heart rate index (CVHRI events/hour) during sleep, a proxy for the evaluation of sleep apnoea, was assessed for each night. After the monitoring, blood samples were collected to assess the inflammatory profile. Regression and …
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Composition and facies variations in mid-cretaceous gates formation coals, Northeastern British Columbia : implications for interpretation of paleo-wetland environments and assessment of coalbed methane characteristics
… controls and implications of coal compositional variation. Differences in lithotype composition reflect microscopic compositional variation. From bright to dull coals, there is a progressive decrease in vitrinite and increase in inertinite. Liptinite is negligible (<1%). Composition and texture …
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Monitoring and modelling the long-term performance of Dublin Port Tunnel
… seasonal temperature change contributes to the cyclic variation of the elastic and reversible deformation whilst tunnel deteriorations lead to the plastic and irreversible deformation. The field measurements are then compared against the numerical results from a series of soil-fluid coupled …
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Scale selection in hydromagnetic dynamos
… scales from the convection granules to the cyclic variation of magnetic activity. The Sun’s magnetic field exhibits coherence in space and time on much larger scales than the turbulent convection that ultimately powers the dynamo. Motivated by the scale separation considerations, in this …
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Spatial and temporal variation of the phytoplankton in Cayuga Lake
… August 1973. The objectives were to: a) describe variation in nutrient parameters in vertical and horizontal space, within years, and historically where data were available, b) describe the phytoplankton (pigment, biomass, and species composition) along the same dimensions, c) analyze the …