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 78 for “"speed and direction"”.
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THE INFLUENCE OF LENGTH CHANGE SPEED AND DIRECTION ON DYNAMIC FUNCTION POTENTIATION IN FAST MOUSE MUSCLE
… function was dependent upon both length change speed and direction. Mouse EDL was cycled in vitro (250 C) about optimal length (Lo) with constant peak strain (± 2.5% Lo) at 1.5,3.3 and 6.9 Hz before and after a conditioning stimulus. A single pulse was applied during shortening or lengthening …
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Relative Accuracy and Precision of Differentially Corrected GPS on a Moving Vehicle
… a method to improve the real-time accuracy and precision of GPS, but there are several sources of differential corrections and each have an associated accuracy and precision. In dynamic applications, the speed and heading of the rover may also have an effect on the accuracy and precision …
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A game theory analysis of proposed strategies of an aerial search for a mobile surface target.
… The initial position of the target is known, and a certain amount of time elapses before the search begins. The target has a variety of choices as to speed and direction, and the search aircraft has a choice of search patterns to be flown. The method proposed to solve the problem of maximizing …
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Optimization Under Uncertainty and Total Predictive Uncertainty for a Tractor-Trailer Base-Drag Reduction Device
… drag coefficient at 57 mph (92 km/h) and that is relatively insensitive to uncertain wind speed and direction and uncertain deflection angles due to mounting accuracy and static aeroelastic loading; the best commercial device of non-optimized design achieves a 12% reduction at 65 mph. …
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Short-term sea level forecasting using machine learning techniques: A case study for South Africa
… inputs (atmospheric pressure, mean wave period and direction, wind speed and direction) and a single output of seawater level was fed into the neural network where 70 % of the data was used for training, 15 % was used for validation and the remaining 15 % was used to test the model. Three …
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Diel and seasonal dynamics of Anaulus australis at Muizenberg Beach, South Africa
This study aimed to expand the geographical range of study the surf zone diatom Anaulus australis in South Africa, focusing on temporal and spatial variations at Muizenberg Beach in False Bay on the south-west coast. The diel cycle of A. australis was studied through hourly samples over 13 hours, …
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An exploration of South Africa's wind climate using station records and reanalysis data
… an exploration of the drivers of surface wind speed, especially in the context of wind resource assessment. This work quantifies the coupling between the synoptic circulation states and station-scale flows to develop a process-based regionalisation of wind regimes over the country .A thorough …
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Deciphering the neural code for retinal ganglion cells through statistical inference
… recordings from a multi-electrode array, and attempt to identify or reconstruct the scene. Our approach uses the well-known linear-nonlinear Poisson model to characterize neural firing behavior and accounts for stochastic variability by fitting parameters using maximum likelihood. To …
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Spatial variability of the ambient noise field associated with the Marginal Ice Zone and its relationship to environmental parameters
… Research Laboratory (NRL) in the East Greenland Sea Marginal Ice Zone (MIZ) . Ambient noise "hot spots" or concentrated areas of relatively high noise levels were found along the ice edge using a towed array. Ambient noise levels were obtained on 27 and 28 July using AN/SSQ-57A and …
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Determination of the Mechanical Properties of Electrospun Gelatin Based on Polymer Concentration and Fiber Alignment
… including how factors such as fiber diameter and porosity are affected by polymer concentration. However, the affects of fiber alignment upon the material properties of electrospun scaffolds remains unclear. The purpose of this study is to determine how the material properties of electrospun …
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Calibration of and Attitude Error Estimation for a Spaceborne Scatterometer using Measurements Over Land
… are used to generate estimates of ocean wind speed and direction. Scatterometers must be calibrated before their measurements are scientifically useful. However, the calibration of NSCAT must be done in orbit. A new methodology for selecting land regions for use in extended target spaceborne …
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Cross-border transfer of climate change mitigation technologies : the case of wind energy from Denmark and Germany to India
This research investigated the causal factors and processes of international development and diffusion of wind energy technology by examining private sector cross-border technology transfer from Denmark and Germany to India between 1990 and 2005. The motivation stemmed from the lack of active …
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Fluid flow measurement using electrical and optical fibre strain gauges.
The design, development and calibration of three flow sensors to measure the speed and direction of fluid flow is presented in this thesis. The force exerted by the fluid flow on the sensors are measured using strain gauges. Multidirectional fluid flow measurement has been made possible by …
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Roughness length variability over heterogeneous surfaces
Monin-Obukhov similarity theory and the empirical formulae of Businger et al. (1971) and Dyer (1974) are used to calculate roughness lengths and surfacelayer heat fluxes from multilevel observations of wind, temperature, and humidity measured at three locations in the Weather Information Network …
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Hurricane Wind Retrieval Algorithm Development For An Airborne Conical Scanning Scatterometer
… in the number of severe hurricanes making landfall in the United States, there is increased emphasis on operational monitoring of hurricane winds from aircraft. This thesis presents a data processing algorithm to provide real-time hurricane wind vector retrievals (wind speed and direction) …
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Colonization and succession of phytoplankton species in upwelling plumes off the Cape Peninsula
Colonization and temporal changes in phytoplankton diversity and biomass in the upwelling plumes off the Cape Peninsula are described for two different communities. A drogue study showed the presence of a fast-developing mixed phytoplankton community with Chaetoceros compressus Laud. and …
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The diurnal cycle of air pollution in the Kathmandu Valley, Nepal
… the diurnal cycle of air pollution in the Kathmandu Valley, Nepal -- a bowl-shaped mountain valley of two million people with a growing air pollution problem but little past research. Field measurements and computer simulations were used to study the interplay of emissions and ventilation. From …
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Estimating light edge velocity based on retinal ganglion cell spike trains
… Problem'. We wish to estimate the velocity (speed and direction) of an edge of light which is moving on the photoreceptor layer of a rabbit retinal patch. We make these estimates based solely on the electrical response measured from the retinal ganglion cells (RGCs). We present various …
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Er:YAG Lasers for Methane and Wind Sensing
… fossil fuel sources to supplement the power grid and second, the development of methods to make green energy sources more reliable. Natural gas is a popular fossil fuel for this transitory phase; it has a low carbon footprint compared to oil if it is fully combusted during use. However, a primary …
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Algorithms for estimating visual motion parameters from ganglion cell responses
… Problem". We wish to estimate the velocity (speed and direction) of an edge of light which is moving on the photoreceptor layer of a rabbit retinal patch. We make these estimates based solely on the electrical responses measured from the retinal ganglion cells (RGCs). To this end, we develop …
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