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.
Results
Showing 1 to 20 of 142 for “"temperature variations"”.
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The effects of ambient temperature variations on structural dynamic characteristics
… the dynamic response of structures due to small variations in test environmental conditions may result in significant errors in experimental and analytical results, leading to erroneous and/or misleading conclusions. This thesis presents an experimental and analytical investigation of the effects …
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Exploring potential mechanisms responsible for observed changes of ultrasonic backscattered energy with temperature variations
… and chemotherapy, but monitoring the temperature accurately and noninvasively is imperative for controlling the exposures. Ultrasound thermometry techniques have been proposed, such as tracking echo shifts or correlating the changes in backscattered energy (CBE) with temperature. …
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Evaluating Temperature Variations, Energy Fluctuations, and Pathways When Excitons Are Transferred in the FMO Complex
… monomer are affected by a change in temperature and explicit inclusion (or exclusion) of intra-molecular vibrational modes following a characterization of important values. A genetic type algorithm was crucial in parameterizing equations of motion that described energy transfer. …
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Microhabitat Temperature Variations and the Post-Burn Response of Vegetation in the Edwards Plateau of Texas
… greater understanding of factors affecting fire temperatures and post-burn vegetational response. In the winter of 1980, a joint study was initiated on the Kerr Wildlife Management Area, near Kerrville, Texas, to assess the impact of: (1) microhabitat differences in fuel load and fuel moisture on …
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Development of Robust Analog and Mixed-Signal Circuits in the Presence of Process- Voltage-Temperature Variations
… controllable elements to compensate for variations is exemplified with two circuits. First, a distortion cancellation method for baseband operational transconductance amplifiers is proposed that enables a third-order intermodulation (IM3) improvement of up to 22dB. Fabricated in a 0.13?m …
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Three-dimensional thermal analysis of curved concrete box girder bridges
… atmosphere. These conditions cause large temperature variations within the structure at any instant of time. In concrete bridges, such temperature variations can result in stresses which can be as large as those caused by dead and live loads. Prediction of such temperature variations is a …
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Thermo-mechamical modelling of arch dams for performance assessment
This document underscores various temperature related components and procedures for undertaking a successful performance analysis of concrete arch dams. Arch dams experience high temperature variations, which are generally assessed using finite element models. Deterioration of arch dams is caused …
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Thermal Infrared Imaging for the Charity Hospital Cemetery Archaeological Survey: Implications for Further Geological Applications
… spatial wavelength anomalies and more subtle temperature variations expected from features at greater depths than those in previous studies. Furthermore detecting features at these depths is aided by diurnal heating but is primarily made possible because annual seasonal temperature variations …
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Compensação de temperatura para sensores de corrente elétrica baseados em redes de Bragg em fibras ópticas
Study and the development of temperature compensation for electrical current sensors based on fiber Bragg gratings using the twin gratings technique. The measurement of electric current by opto-mechanical sensors is very well described in the literature, as well as techniques that propose the …
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Modelling the Viability of Heat Recovery from Underground Pipes. Deterministic modelling of wastewater temperatures in a 3000 sewer pipe network
Modelling wastewater temperature variations in a network of 3048 sewer pipes was achieved in this project. Recovering heat from sewers presents attractive options for producing clean energy. However, heat recovery from sewerage may result in wastewater temperature drops which may reduce the …
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Simulação de escavação escorada por meio de elementos isoparamétricos
… of supporting structures and effects due temperature variations. An incremental analysis is made, which is able to simulate any construction sequence. The isoparametric quadratic element used confers considerable flexibility to the program. Some comparisons with actual cases are made.
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The dynamic cutting of metals
… and theory for most of the experimental range. Temperature estimates involved in phase change estimates show that there are large tool temperature variations under chatter or milling conditions. These temperature variations and the consequent thermal stresses are likely to cause tool failure …
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Vibration- and Impedance-based Structural Health Monitoring Applications and Thermal Effects
… by environmental changes. In particular, temperature changes can cause many SHM algorithms to indicate damage when no damage exists. While several experimentally based efforts have been attempted to alleviate temperature effects on SHM algorithms, fundamental research on the effects of …
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Automatic calibration of modulated fractional-N frequency synthesizers
… analog PLL transfer function across process and temperature variations. The automatic calibration circuit, which is the main contribution of this thesis, operates while the transmitter is in service. This online calibration eliminates the need for production calibration and periodic down time for …
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Shallow geothermal energy: effect of in-situ conditions on borehole heat exchanger design and performance
… m² and equipped with fiber optic cables. Several temperature measurements and Distributed Thermal Response Tests (DTRTs) were conducted in situ in a period of four years, including a long-duration DTRT (heating phase of 7 months), during which temperature was measured by the fiber optics in all …
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Transient heat transfer analysis of heat exchangers in a Marnoch Heat Engine
… for laminar and turbulent flows is modelled. The temperature variations of the working fluid, the heating fluid and the wall, are calculated. The temperature distribution of the fluids and the wall over the length of the heat exchanger is also calculated. It is found that the temperature of the …
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Probabilistic aerothermal design of gas turbine combustors
… are used to link combustor liner life, liner temperature variability, and the effects of manufacturing variability. A probabilistic analysis is then applied to the simplified models to estimate the combustor life distribution. The material property and liner temperature variations accounted …
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Effects of temperature on the electrical impedance of piezoelectric elements
… impedance can also occur due to changes in temperature. Piezoelectric materials have been known to have temperature dependency regarding their basic properties, such as the dielectric constant and the piezoelectric coefficient. In this thesis, this temperature dependency will be …
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Unified Mathematical Modeling, Analysis and Simulation of COVID-19 and Ecological Processes
… We analyze how environmental factors such as temperature variations, seasonal rainfall patterns, and vegetation indices (NDVI) influence group sizes and social interactions over time. This ecological modeling employs similar mechanistic ODE-based frameworks, highlighting methodological …
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