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Showing 1 to 20 of 57 for “"Pressure-Volume"”.
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Mathematical Modelling of Brain Haemodynamics and Pressure-Volume Compensation
… which requires an accurate understanding of pressure-volume interactions inside the cranium. This thesis used a hydrodynamic model representing the circulation of cerebral fluids to investigate the relationships between intracranial pressure (ICP) and cerebral blood volume (CBV) changes. The …
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Development of a three dimensional pressure-volume-temperature model for use in teaching environments
Three phase equilibrium can be a difficult concept to comprehend, since it has geometric relationships in three dimensions. A teaching aid was developed to aid in explaining phase diagrams to student. The curve was made from transparent sheets of acrylic so the saturation curve could be projected …
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Characterization of Urinary Bladder Smooth Muscle: I. Pressure-Volume, Tension-Length Relationships. Ii. Mechano-Electrical Properties. Iii. Autonomic Regulation
Made available in DSpace on 2014-12-09T23:34:01Z (GMT). No. of bitstreams: 1 6910758.pdf: 6301385 bytes, checksum: cfcdfa9bd2cd56b9def26923a033b653 (MD5) Previous issue date: 1968
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Material parameter identification for modelling the left ventricle in the healthy state
… model of Westerhof. The model was calibrated to pressure-volume data, which was adaptedfrom the work of Kerckhoffs. The projected Levenberg-Marquardt algorithm was used to identify material parameters. Identification of the anisotropic constants in the model of Usyk proved to be difficult, with …
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Sex dimorphism in the cardiometabolic effects of the smoothelin-like 1 protein deletion in an ageing mouse model
… and female) was assessed by echocardiography and pressure-volume loop, and the metabolic measurements of middle-aged animals (12-month-old, male and female) were carried out in the comprehensive lab animal monitoring system (CLAMS). The cardiac hemodynamic profiling showed that young male SMTNL1 …
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Angiogenesis and Myogenesis in a Chronic Ischemic Heart.
… 4, Ischemia + Cells. Sonomicrometry and Millar pressure transducers were used to determine contractility, left ventricular pressure, and pressure-volume loops. There were no significant differences (p<0.05)among the hemodynamic data except for Group 4, which produced significantly lower output …
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Design of a single orifice pulse tube refrigerator through the development of a first-order model
… The model predicts cooling power as well as the pressure/volume relationships for various segments of the refrigerator with minimal computational requirements. The first portion of this document describes the development of this model and its simplifications relative to higher-order numerical …
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The design, synthesis and properties of pressure-processable biodegradable block copolymers
… and synthesized for their susceptibility to pressure-induced mixing. These baroplastic materials are capable of being processed and molded through the application of pressure at temperatures far below those needed in traditional melt-processing of biodegradable polyesters. Pressure molding at …
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Studies in right ventricular function: Employing the conductance catheter method for ventricular volume determination
… isolated left ventricle as constants that relate pressure to volume during systole and diastole and proposed the model of "time-varying elastance". One success of this approach has been the development of contractile indices that are generally independent of loading conditions. These indices, …
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Incorporating Mullins Effect into the Modeling of Hyperelastic Actuators
… study was performed to calibrate a hyperelastic pressure-volume relationship for thin-walled cylinders with Ogden-Roxburgh damage. Included in this model is a fractional multiplier to capture the convergence of stress softening after roughly 10 cyclic loadings. The Ogden-Roxburgh model was …
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Assessment of Cardiac Function by Acoustic Radiation Force (ARF) Based Methods of Ultrasound Elastography
… systolic and diastolic function, is the pressure-volume (PV) loop measurement; however, this measurement is not typically used clinically due to the invasiveness of the technique. PV loop measurement requires the introduction of a pressure or pressure-volume catheter into the left …
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Investigation of fluid properties at non-ambient conditions
… was identified. A series of measurements of the pressure-volume-temperature relations of diesel fuels was undertaken using a Micro-PVT apparatus at pressures to 300MPa in the temperature range 25 to 75°C. A new calibration procedure for this instrument was devised to enable measurements of high …
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Assessment of fruit growth response to water stress in a super-high-density olive orchard: monitoring, physiological mechanisms and potential use to schedule irrigation.
… growth (Chapter 4). Additionally, we performed pressure-volume curves with olive fruits from well irrigated and deficit irrigated treatments. Finally, we evaluated the usefulness of fruit dendrometers, and the indexes derived from its measurements, to assess tree water status and to schedule …
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Assessing safety margins and hydraulic strategies in Restionaceae: evaluating xylem hydraulic traits in two Elegia species
… the turgor loss point (ΨTLP) was acquired from pressure-volume curves. E. fenestrata, a localized seep species, was more vulnerable (P12 = −0.52 MPa; P50 = −1.07 MPa; ΨTLP = −1.57 MPa; negative safety margin = −0.5 MPa) than E. tectorum, a widespread, dry habitat species (P12 = −0.99 MPa; P50 = …
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The influence of water and light on the physiology and spatial distributions of three shrubs in the Southern Appalachian Mountains
… has less than 10 % reduction. Seasonal pressure volume curve determinations, conductance measurements, and water potential measurements of plants in the natural environment indicated that photosynthesis is not affected by water potential in <i>K. latifolia</i>. <i>R. maximum</i> has a …
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Halogens and trace elements in subduction zones
… and aqueous fluids at high temperatures and pressures. The solubility of fluorine and chlorine in upper mantle minerals (forsterite, enstatite and pyrope) and halogen partitioning between aqueous fluids and these minerals were investigated by piston-cylinder experiments at 1100 °C and 2.6 …
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Molecular dynamics calculation of mean square displacement in alkali metals and rare gas solids and comparison with lattice dynamics
… vol ume a swell as for the the ze r 0 pressure ze ro zero pressure volume corresponding to each temperature. In the fcc case, results were obtained for a wide range of both the temperature and density. Lattice dynamics calculations of the harmonic and the lowe s t order anharmonic …
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Thermodynamic calculations with TK!Solver
… been developed. Program ESTATE.TK calculates volumetric properties of compounds using the ideal gas law, Pitzer correlation, van der Waals, Redlich-Kwong, Dieterici, or Berthelot equation of state. The volumetric properties include temperature, pressure, volume, and compressibility factor. …
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