17,032 research outputs found
Instrumented transducer for study of the bat echolocation process
Get PDFEvolution has enabled the bat to echolocate with ease and efficiency, to the extent that the bats capabilities far exceed the most technologically advanced manmade systems. Such capabilities reinforce mans intrigue in the animal kingdom. In studying bats we aspire to quantify and understand their inherent skills in the hope of transferring them to engineering systems. In trying to further our understanding of the animal kingdom it is often the case that we try to replicate or mimic what the animal is doing. In terms of echolocation it is thought that a bat emits a signal and retains memory of an exact copy to be used in conjunction with the returning echo to reveal information about the target. To emulate the vocalisation and auditory system of a bat it is necessary to both accurately generate and detect sound waves
Off-Farm Employment Opportunities and Educational Attainment in Rural China
Get PDFLabor and Human Capital,
A trapped mercury 199 ion frequency standard
Get PDFMercury 199 ions confined in an RF quadrupole trap and optically pumped by mercury 202 ion resonance light are investigated as the basis for a high performance frequency standard with commercial possibilities. Results achieved and estimates of the potential performance of such a standard are given
Farmers advised to weather the storm and stick to their original plans
Get PDFThe sunny forecast this week is expected to help dry out the saturated and flooded field conditions so farmers get back in the field to plant corn and soybeans. The USDA crop progress report issued on May 7 says that 53 percent of the planned Iowa corn acreage is now planted and 4 percent of the soybean crop is planted. For those farmers still waiting anxiously to plant, two Iowa State University (ISU) Extension agronomists are advising producers not to go switching hybrids and varieties of corn and soybeans just yet
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