Fear of predators doesn't just affect the penguins' daily activities, however. It also influences the birds' migration patterns, Ainley and Ballard report this week in Polar Biology.
Carbazoles are polar compounds in oils, and they are useful indicators for study of hydrocarbon migration.
咔唑类化合物是原油中极性较大的化合物，是研究油气运移的有效指标。
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Then three spotlight mode SAR imaging algorithms are discussed and compared, including polar format (PF) algorithm, chirp scaling (CS) algorithm and range migration (rm) algorithm.