The ability to observe the health of a field from images taken remotely by satellites or aircraft may have a positive economic and environmental impact on plant disease management, say plant pathologists with The American Phytopathological Society (APS).
According to Karl Steddom, associate research scientist at the Texas Agricultural Experiment Station in Amarillo, Texas, "remote sensing" in plant disease management is the practice of gathering information about a crops health without physically scouting the field. Typically, this occurs through images captured from aircraft or satellites, but there are also ground-based applications. "The ability to view images of an entire field provides plant pathologists with greater precision and accuracy in disease assessment," he said. "By using remote imagery to differentiate between healthy and diseased plants, we are then able to determine how many acres are impacted by a particular disease," said Steddom.
Researchers first used remote sensing to differentiate between healthy and diseased crops in the late 1920s after U.S. Army pilots reported that cotton root rot spots were readily visible from the air at high altitudes. These spots were then photographed by hanging a camera over the side of the aircraft. The stark contrast between healthy cotton plants and the bare soil where the pathogen had killed the plants made the spots stand out in the photographs and the vertical angle allowed for comparative measures of healthy and diseased acreage.
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The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
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