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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Analysis Of Polarimetric Synthetic Aperture Radar And Passive Visible Light Polarimetric Imaging Data Fusion For Remote Sensing Applications, Sanjit Maitra
Theses
The recent launch of spaceborne (TerraSAR-X, RADARSAT-2, ALOS-PALSAR, RISAT) and airborne (SIRC, AIRSAR, UAVSAR, PISAR) polarimetric radar sensors, with capability of imaging through day and night in almost all weather conditions, has made polarimetric synthetic aperture radar (PolSAR) image interpretation and analysis an active area of research. PolSAR image classification is sensitive to object orientation and scattering properties. In recent years, significant work has been done in many areas including agriculture, forestry, oceanography, geology, terrain analysis. Visible light passive polarimetric imaging has also emerged as a powerful tool in remote sensing for enhanced information extraction. The intensity image provides information …
Physics-Based Surface Energy Model Optimization For Water Bodies In Cold Climates Using Visible And Calibrated Thermal Infrared Imagery, May V. Casterline
Physics-Based Surface Energy Model Optimization For Water Bodies In Cold Climates Using Visible And Calibrated Thermal Infrared Imagery, May V. Casterline
Theses
When tasked with accurately modeling a water body in a cold climate environment, the complexity of the system being simulated and the numerous parameters affecting the observable outcome pose an arduous task for any modeling effort. The task is increasingly complicated when the body of water is serving as a cooling pond for a power plant and can become partially frozen. The introduction of a heat effluent into the water creates a highly dynamic system whose physical state is not only reactionary to the surrounding environmental conditions, but the industrial facility's operating parameters as well. Both calibrated thermal and visible …
Solar Eclipse Observation On May 21, 2012 From Jvla, Shaheda Begum Shaik
Solar Eclipse Observation On May 21, 2012 From Jvla, Shaheda Begum Shaik
Theses
The annular solar eclipse occurred on May 21, 2012 is studied using the radio data from the Jansky Very Large Array (JVLA), Sorrocco, Mexico. The eclipse is observed in the solar minimum activity period of solar cycle 24. The centimeter wavelength observation of the Sun's surface during the solar eclipse helps in determining the spatially well resolved features not obtained by the man made advanced technology. Even though, the activity on the Sun is observed to be low in the period of eclipse, the study provides a good opportunity to understand the quiet Sun features in the regions occulted by …
Validation Of Solar Flare Forecasting & Evolution Of Magnetic Helicity Of Two Active Regions, Qin Li
Validation Of Solar Flare Forecasting & Evolution Of Magnetic Helicity Of Two Active Regions, Qin Li
Theses
This thesis includes two components: (1) Validation of the NJIT flare-forecasting model that was established in recent years is carried out based on the statistical correlation between solar magnetic parameters and flare productivity of active regions (ARs). 378 ARs are examined, comparing observation with prediction. It is found that the accuracy rate to some extent decreases with the level of flares. (2) The temporal evolution of the relative magnetic helicity of two ARs, AR 11072 and 11158 is investigated. The former is flare-quiet while the latter is flare-productive over the 5-day observation period. It is found that for both regions, …
Optical Emission Properties Of Band Structure Tailored Semiconductor Nanostructures, Nicola Pavarelli
Optical Emission Properties Of Band Structure Tailored Semiconductor Nanostructures, Nicola Pavarelli
Theses
In the past decades, with the development of low-dimensional semiconductor heterostructures, research has been focused on studying novel materials and proposing new solutions for the improvement and optimization of numerous optoelectronic applications. Examples of these applications include optical data storage, displays and medical diagnostics in the ultraviolet and visible spectral range, or telecommunication networks, solar cells, gas sensing and imaging systems in the near- and mid-infrared. In this thesis, the optical characterization of a number of promising semiconductor nanostructures for the realization of next-generation optoelectronic devices is reported. The optical emission properties of each structure, measured by means of power-dependent …
Ultrafast Carrier Dynamics In Semiconductor Nanostructures, Jaroslaw Pulka
Ultrafast Carrier Dynamics In Semiconductor Nanostructures, Jaroslaw Pulka
Theses
Rapid development of telecommunication systems forces a switch to all- optical data processing and transmission. To design such systems it is critical to understand the ultrafast processes which occur in the components of such systems, especially in Monolithic Modelocked Lasers. The purpose of this work was to identify the main physical processes influencing carrier dynamics in semiconductor nanostructures which show promise for future telecommunication systems. This study was carried out by means of ultrafast pump-probe spectroscopy, which allowed characterisation with a sub-picosecond resolution. The main part of the thesis concentrates on the analysis of the InAs/GaAs Quantum Dot (QD) system. …