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Now showing items 31-40 of 56
Time-lapse imaging of human heart motion with switched array UWB radar
(2014)
Radar systems for detection of human heartbeats have mostly been single-channel systems with limited spatial resolution. In this paper, a radar system for ultra-wideband (UWB) imaging of the human heart is presented. To ...
Temporal variability of the bioaerosol background at a subway station: Concentration level, size distribution, and diversity of airborne bacteria
(2014)
Naturally occurring bioaerosol environments may present a challenge to biological detection-identification-monitoring (BIODIM) systems aiming at rapid and reliable warning of bioterrorism incidents. One way to improve the ...
Comparative testing and evaluation of nine different air samplers: End-to-end sampling efficiencies as specific performance measurements for bioaerosol applications
(2014)
Accurate exposure assessments are needed to evaluate health hazards caused by airborne microorganisms and require air samplers that efficiently capture representative samples. This highlights the need for samplers with ...
How man-made interference might cause gas bubble emboli in deep diving whales
(2014)
Recent cetacean mass strandings in close temporal and spatial association with sonar activity has raised the concern that anthropogenic sound may harm breath-hold diving marine mammals. Necropsy results of the stranded ...
Communities of Trust in Tactical Coalition Networks
(2014)
The need for information exchange between security domains has traditionally been approached through the use of guards and security labels. Although these technologies are thoroughly researched and exist in mature ...
Modeling Effectiveness of Gradual Increases in Source Level to Mitigate Effects of Sonar on Marine Mammals
(2014)
Ramp-up or soft-start procedures (i.e., gradual increase in the source level) are used to mitigate the effect of sonar sound on marine mammals, although no one to date has tested whether ramp-up procedures are effective ...
Compact airborne C-band radar sounder
(2014)
We describe a lightweight wideband C-band radar sounder, which is designed for use in a small unmanned aerial vehicle, primarily for measuring snow and ice. The waveform used is a gated frequency modulated continuous wave, ...
High thresholds for avoidance of sonar by free-ranging long-finned pilot whales (Globicephala melas)
(2014)
The potential effects of exposing marine mammals to military sonar is a current concern. Dose–response relationships are useful for predicting potential environmental impacts of specific operations. To reveal behavioral ...
Botulism outbreaks in natural environments - an update
(2014)
Clostridium botulinum comprises a diverse group of botulinum toxin-producing anaerobic rod-shaped spore-forming bacteria that are ubiquitously distributed in soils and aquatic sediments. Decomposition of plants, algae, and ...
Interstate Relations in the Arctic: An Emerging Security Dilemma?
(2014)
The five states that surround the Arctic Ocean— Russia, Canada, the United States, Denmark, and Norway—have in recent years taken various measures to protect their economic and security interests in the north. The measures ...