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This research describes the seasonal phenological pattern of Africa's vegetation and its recent trends using MODIS EVI time-series data with a relatively fine spatial resolution of 500 m and a long temporal range of 15 years (2001–2015). The objectives were to measure the vegetation phenology of the major land cover types and determine the temporal trends across the geographical sub-regions of Africa...
Asteroids that could collide with the Earth are listed on the publicly available Near Earth Object (NEO) hazard web sites maintained by the National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA). The risk of 69 potentially threatening NEOs that produce 261 dynamically distinct impact instances, or Virtual Impactors (VIs), has been calculated using the Asteroid Risk...
Recent studies has showed that the modification on land use have an impact to hydrology particularly flood and global climate variability. Therefore, the major factor decided to the effect of hydrological responses in contributing flood disaster in this research, is land use changes as well as climate variability. This study tries to provide a framework mainly to apply a semi-distributed hydrological...
NASA aeronautical programs require rigorous ground and flight testing. Many of the testing environments can be extremely harsh. These environments include cryogenic temperatures and high temperatures (greater than 1500°C). Temperature, pressure, vibration, ionizing radiation, and chemical exposure may all be part of the harsh environment found in testing. This paper presents a survey of research opportunities...
Many studies have been carried out for bathymetry mapping based on remotely sensed imagery coupled with ancillary datasets. Most of the techniques that have been developed are mainly used for shallow and clear water rivers, while deep, turbulent and highly suspended sediment rivers have received little attention in terms of developing new techniques. The aims of this study were (i) to predict a bathymetry...
Novel RHBD techniques are described that utilize charge sharing to mitigate voltage transients due to single event strikes in a folded cascode operational amplifier. These techniques are verified using simulations in a 180-nm CMOS process.
Floating-body and body-tied inverter circuits were implemented in MIT Lincoln-Lab's 3-dimensional SOI 150 nm process to characterize the technology for single-event effects. The circuits were tested with heavy-ions and single-event transients were measured for body-tied and floating-body inverters across all tiers. These experimental results show that for floating-body and body-tied circuits that...
Reliability-aware logic synthesis can be used to mitigate a circuit's response to radiation-induced soft errors. This paper analyzes the impact of using reliability-aware logic synthesis to reduce both the pulse width and the drain area of a circuit. Using our targeted cell library, several benchmark circuits were analyzed to identify equivalent, less-vulnerable implementations while minimizing penalties...
The proof of concept for using surface acoustic wave (SAW) strain sensors in the detection of aircraft fastener failures is demonstrated. SAW sensors were investigated because they have the potential for the development of passive wireless systems. The SAW devices employed four orthogonal frequency coding (OFC) spread spectrum reflectors in two banks on a high temperature piezoelectric substrate....
Phenological information can be provided globally using remote sensing based time-series vegetation indices. Basic differences in the data and methods used can yield different results. This study analysed such differences in the phenological information, mainly onset of greenness (OG), estimated using the Enhanced Vegetation Index (EVI) from Moderate Resolution Imaging Spectroradiometer (MODIS) data...
New heavy-ion data from a 130 nm bulk CMOS process shows a counterproductive result in using a common single-event charge collection mitigation technique. Guard bands can reduce single-event pulse widths for normal strikes, but increase them for angled strikes. Calibrated 3D TCAD mixed-mode modeling has identified a multiple-transistor charge collection mechanism that explains the experimental data,...
A Science Advisory Panel of the Alaska Cruise Ship Initiative investigated possible effects of commercial passenger vessel wastewater discharges on marine life in coastal waters of the Gulf of Alaska. The Panel concluded that due to the high dilution rates of moving cruise ships there is little likelihood of contaminant impacts to marine life in the water column, at the sea surface, in subsurface...
An independent Science Advisory Panel (The Panel) was formed to assist the Alaska Department of Environmental Conservation evaluate the effects of wastewater discharges from cruise ships in Alaskan waters. The Panel evaluated the dilution of wastewater discharges from moving cruise ships. The results of that evaluation were used in turn to evaluate possible effects on water quality. This paper describes...
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