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 51 for “"vertical resolution"”.
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Vertical resolution capability study of direct-current, magnetotelluric, and time-domain electromagnetic methods
Includes bibliographical references (pages 244-247).
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Modeling nighttime chemistry with WRF/chem: sensitivity to vertical resolution and boundary layer parameterization
… crucially on the characteristic development of vertical profiles of gas phase and aerosol phase species in the nocturnal boundary layer. Resolving these profiles adequately is a prerequisite for a good representation of nighttime chemistry and poses an important modeling challenge. In this work …
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Double-Exposure Gray-Scale Photolithography
… is accomplished by diffraction through sub-resolution pixels on a photomask. The number of photoresist levels is determined by the number of different pixel sizes on the mask, which is restricted by mask fabrication. This drawback prevents the use of gray-scale photolithography for …
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Joint inversion of density and resistivity logs for the improved petrophysical assessment of thinly-bedded clastic rock formations
… in the world are thinly bedded. Limited vertical resolution of logging tools, particularly deep resistivity tools, often causes ambiguity in log interpretation across interbedded rock formations. This situation routinely gives rise to inaccurate assessments of in-place hydrocarbon …
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Three-dimensional water vapor retrieval using a network of scanning compact microwave radiometers
… measurements of water vapor aloft with high time resolution and sufficient spatial resolution have the potential to improve forecast skill for the initiation of convective storms. Such measurements may be used for assimilation into and validation of numerical weather prediction (NWP) models. …
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Forecasting the nighttime evolution of radio wave ducting in complex terrain using the MM5 numerical weather model
… model predictions to changes in horizontal and vertical resolution is also tested. Results of these analyses reveal that rapid radiational cooling around sunset and subsequent cold air pooling establish vertical temperature gradients that, along with pre-existing moisture gradients, are …
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CRYOGENIC ATOMIC FORCE MICROSCOPE FOR CHARACTERIZATION OF NANOSTRUCTURES
… AFM imaging with 10nm horizontal and ~2 angstrom vertical resolution has been achieved. We have used this AFM in the current-voltage characterization of diodes, and, with a modified sensing mechanism, electrical force microscopy (EFM) and magnetic force microscopy (MFM) have been demonstrated.
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Application of Ground Penetrating Radar to Study the Internal Architecture of Coastal Dunes, North Padre Island, Texas
… antennae. The 200-MHz antenna datasets have a vertical resolution of 15 cm on the natural dune and 16.6 cm on the maintained dune. The 400-MHz antenna datasets have a vertical resolution of 10.7 cm on both the natural and maintained dunes. Sediment samples were collected every 10 cm at three …
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ASSESSING PERFORMANCE OF NCEP RAPID REFRESH MODEL TO PREDICT BOUNDARY LAYER PROPERTIES
… complicated since they need to resolve 1km vertical resolution for temperature and water vapor. The AIRS hyperspectral sensor may be able to retrieve relative humidity with 20% RMSE but low correlations with R<sup>2</sup> – 0.4. The alternative is to explore meteorological forecasts (i.e. …
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Fundamentals of heat transfer and thermal-mechanical control for improved atomic force microscopy
… a 550 µm × 90 µm area at 1.1 mm/sec with 0.6 nm vertical resolution and at 4.0 mm/sec with 44 nm wide pixels. The measurement rate was improved by more than 2 orders of magnitude compared to conventional AFM with a single cantilever. To demonstrate the ability to manufacture and repair …
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A broad Iceland plume associated with two phase transitions at the 660 km discontinuity: Constraints from receiver functions
… controversy mostly originates from the limited vertical resolution of seismic tomography techniques and the associated uncertainty in the depth and lateral extents of the lower wavespeed anomaly. Here we utilize a robust receiver-function-based technique to image the topography of the 410 and …
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Improvement of three dimensional acoustic field estimation using tomographic reconstructions of the ocean
… and the front's maximum perturbation 15ms-1. Two vertical slices through this system were inverted in a synthetic tomography experiment using linear optimal estimation theory. Inversions were also performed using XSV and satellite sea surface temperature data. Gaussian fits to the reconstructed …
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Local Bundling of Disparity Maps for Improved Dense 3D Visual Reconstruction
This thesis presents a new method for improved resolution of stereoscopic 3D terrain mapping by local dense bundling of disparity maps. The Unmanned Systems Lab (USL) at Virginia Tech is designing an unmanned aerial vehicle (UAV) first-response system capable of 3D terrain mapping in the wake of a …
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ENHANCEMENT OF THE GEOLOGICAL FEATURES OF THE SCOTIAN BASIN BY THE APPLICATION OF SPECTRAL INVERSION, OFFSHORE NOVA SCOTIA
… from one another due to the limit of seismic resolution. It would be advantageous for geoscientists to image thin beds below resolution, especially those which are of reservoir quality. Frequency information obtained from spectral decomposition is related to the temporal thickness of layers. …
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Rotational Transformation Methods for Radio Occultation and Passive Microwave Radiometry Colocation Analysis
… to mitigate. GNSS-RO provides extremely high vertical resolution retrievals in the Marine Boundary Layer but by itself is unable to distinguish between the contributions of water vapor and the “dry” atmosphere. MWR instruments have inherent biases in antenna temperature. GNSS-RO and MWR …
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Evaluating Late Pleistocene and Holocene Rupture, Seismic Hazards and Ground Motion in the Lake Tahoe Basin
… (Light Detection and Ranging) imagery, high-resolution seismic CHIRP profiles, multibeam bathymetric mapping, and field mapping. The combined lateral and vertical resolution has allowed a straight forward identification of the landward extension of fault scarps associated with the three major …
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Design of a nonhydrostatic atmospheric model based on a generalized vertical coordinate
… climate. These include the elimination of the vertical velocity in adiabatic flow, which simplifies the motion to a two-dimensional problem and greatly reduces the numerical errors associated with vertical advection. Vertical resolution is enhanced in regions of high static stability which …
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Multiple frequency atmospheric radar techniques
… use of multiple frequency coding to improve the vertical resolution of pulsed-Doppler very high frequency (VHF) atmospheric radars, especially with regards to the two-frequency technique known as frequency domain interferometry (FDI). This technique consists of transmitting alternate pulses on …
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Retrieval of cloud-cleared atmospheric temperature profiles from hyperspectral infrared and microwave observations
… from 0-15 km in clear air at a horizontal resolution of 2000 km2 and a vertical resolution of 1 km. RMS radiance errors under cloudy conditions for altitudes from 0 to 10 kilometers ranged from 1.25 K to 0.1 K for radiance retrievals near 15 microns, and from 0.8 K to 0.05 K for radiance …
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USING AVO ANALYSIS TO DETERMINE THE GAS RESERVOIRS IN THE SOUTH THRACE BASIN, NORTHWEST TURKEY
… basin in Turkey. The Thrace basin is basically a vertical stack of sand-shale-silt sequences with no complex structures or salt domes. In such sedimentary stacks, rock properties such as density and velocity to calculate Poisson’s Ratio and preserving amplitude are very significant in order to …
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