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 73 for “"wind velocity"”.
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The effect of the wind velocity gradient on airplane performance
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautical Engineering, 1925.
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A computer program for an equation of wind velocity profiles from zero to thirty feet
… of the structure and nature of natural wind and to the development of theories which can be applied to the design of buildings and other structures. Extensive studies of the velocity profile of wind have been made from the ground to the stratosphere, but investigators have concentrated …
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Aerodynamic Study of Forces due to Wind Velocity and Angle of Attack on Parabolic Solar Troughs
… well.</p> <p>This study examines the effects of wind at various speeds, with various angles of attack on parabolic solar troughs. This begins by picking up on previous study, corroborating previously found data, then introduces new angles of attack. The model includes the presence of the solar …
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An Invariant Extended Kalman Filter for Indirect Wind Estimation Using a Small, Fixed-Wing Uncrewed Aerial Vehicle
… temperature, and humidity) and kinematic state (wind velocity) of the atmospheric boundary layer (ABL) can aid in numerical weather prediction, help scientists assess climatological and topological features over a region, and can be incorporated into flight path planning and control of small …
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Wind power applications to groundwater remediation
… with reduced greenhouse gas emissions. Small wind turbine systems marketed for single residence applications may be the appropriate size for remediation systems, and such wind turbines are readily available at reasonable cost. Another benefit of using domestic wind turbine systems is that they …
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Documentation and demonstration of naturalistic method for measuring climate/behavior relationships
… factors such as temperature, relative humidity, wind velocity, solar radiation, and the composite climate index, the Index of Thermal Stress, were analyzed to find a relationship with outdoor behavior. Graphic and statistical methods were used to analyze observation data. As the temperature on …
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Effectiveness of Shelterbelts In Improving Microclimatic Conditions for Pheasants In Eastern South Dakota
… compared microclimate regimes , as determined by wind and temperature, between shelterbelts containing 1 or 2 rows of coniferous tree species with shelterbelts comprised entirely of deciduous tree species and between wetland and shelterbelt habitats. Maximum temperatures within both shelterbelt …
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Sensing Atmospheric Winds from Quadrotor Motion
Wind observations that are critical for understanding meteorological processes occurring inside of the Earth's atmospheric boundary layer (ABL) are sparse due to limitations of conventional atmospheric sensors. In this dissertation, dynamic systems and estimation theory are combined with …
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Rotor eólico Darrieus: um estudo experimental
… with "Prony" brake dynamometer was tested in a wind tunnel with a 1 m2 test section and maximum wind velocity of 8,0 m/s. The experimental results were compared with those of the theoretical computer model.
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An investigation of the performance of a stationary siphoning type of roof ventilator
… on a ten-foot stack at the mouth of a calibrated wind tunnel, and by measuring with a Velometer the Velocity of the air traveling up the stack, determining the volume of air drawn through the stack while winds of from two to seven miles per hour were blowing across the ventilator. The second …
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Evaluation of Ground-Based Spectral Imaging Capabilities for Detecting and Quantifying Landfill Methane Emissions
… cloud enables the calculation of the transport wind velocity. A one-box model was used to derive emission rates using wind data from a co-deployed wind lidar. There is a strong correlation between the emission rates and the wind velocity, indicating that the short-term emission rate variability …
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΗΣ ΑΚΡΙΒΕΙΑΣ ΤΩΝ ΗΛΕΚΤΡΟΜΑΓΝΗΤΙΚΩΝ ΜΕΤΡΗΣΕΩΝ ΑΠΟΣΤΑΣΕΩΝ ΜΕ ΤΗ ΒΟΗΘΕΙΑ ΣΤΑΤΙΣΤΙΚΩΝ ΜΕΘΟΔΩΝ
… THE HELP OF SOME MODELS THE INFLUENCE OF CLOUDS, WIND VELOCITY AND WIND DIRECTION IS PASSING INTO THEM FROM DETERMINISTIC POINT OF VIEW.
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Experimental and simulation analysis for performance enhancement of elliptical savonius wind turbine by modifying blade shapes
… review, it was realized that the Savonius wind turbines are an applicable option at low wind speed areas, where the counterpart of these turbines cannot work efficiently. Nevertheless, the existing design is still under research to make it more applicable in urban areas. Therefore, the …
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Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
Wind energy technology represented in wind turbines is one of the fastest growing alternative energy technologies, especially horizontal axis wind turbine (HAWT) type which is more efficient, compared to other conventional wind turbines. However, it is less utilized in urban areas due to the …
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Investigation of Radar Interferometric Techniques With Application to the Atmosphere
… The zonal and vertical components of the drift velocity of distinct irregularity patches within the radar field of view are estimated using a combination of Doppler and image evolution information RII technique provides with temporal and spatial resolutions of a few seconds and kilometers, …
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Novel Airframe Design for the Dual-Aircraft Atmospheric Platform Flight Concept
… flight concept that exploits stratospheric wind velocity gradients to remain aloft indefinitely. Classical aircraft preliminary design techniques and high-fidelity tools were used to establish a baseline configuration.</p> <p>Performance characteristics of numerous airfoil profiles were …
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Advection at a forest site – an updated approach
… observe small concentration gradients and small wind velocities and because of the spatio-temporal measurement resolution required to observe complex 3-D flow phenomena. This work presents an experimental multi-analyzer setup for the observation of horizontal CO2 concentration gradients with high …
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A stochastic ensemble forecast model for geosynchronous relativistic electron fluxes
… statistical link between electron flux and solar wind speed using empirically derived linear filter coefficients, the Li model solves a radial diffusion equation with a diffusion coefficient that is a function of the solar wind velocity and interplanetary magnetic field, and the Fluxpred model is …
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Evaluation of the dynamic characteristics of the K-Gill anemometer
… of the anemometer had been evaluated in a wind tunnel test. The wind tunnel test showed a non-linear and a non-cosine behavior, as shown in previous studies (Ataktürk, 1988; Pond et al., 1979). The turbulence energy spectra from the field test revealed that the propeller anemometer behaves …
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Stratospheric scattering of radio waves and the Jicamarca radio telescope
… spectrum of turbulent fluctuations, the mean wind velocity, and the root-mean-square velocity fluctuations are directly related to the autocorrelation function of the scattered signals. The theory and mechanisms of stratospheric scattering of radio waves is discussed. The equipment and …
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