Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A New Method to Calibrate Attachment Angles of Data Loggers in Swimming Sharks | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 732586 6 pages doi 2010 732586 Research Article A New Method to Calibrate Attachment Angles of Data Loggers in Swimming Sharks Shizuka Kawatsu 1 Katsufumi Sato 2 Yuuki Watanabe 3 Susumu Hyodo 1 Jason P. Breves 4 Bradley K. Fox 4 E. Gordon Grau 4 and Nobuyuki Miyazaki1 1 Ocean Research Institute The University of Tokyo 1-15-1 Minamidai Nakano Tokyo 164-0014 Japan international Coastal Research Center Ocean Research Institute The University of Tokyo 2-106-1 Akahama Otsuchi Iwate 028-1102 Japan 3 National Institute of Polar Research 10-3 Midorimachi Tachikawa Tokyo 190-8518 Japan 4 Hawaii Institute of Marine Biology University of Hawaii Kaneohe HI 96744 USA Correspondence should be addressed to Shizuka Kawatsu kawatsusame@ Received 2 May 2009 Accepted 7 August 2009 Academic Editor Joao Manuel R. S. Tavares Copyright 2010 Shizuka Kawatsu et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Recently animal-borne accelerometers have been used to record the pitch angle of aquatic animals during swimming. When evaluating pitch angle it is necessary to consider a discrepancy between the angle of an accelerometer and the long axis of an animal. In this study we attached accelerometers to 17 free-ranging scalloped hammerhead shark Sphyrna lewini pups from Kaneohe Bay Hawaii. Although there are methods to calibrate attachment angles of accelerometers we confirmed that previous methods were not applicable for hammerhead pups. According to raw data some sharks ascended with a negative angle which differs from tank observations of captive sharks. In turn we developed a new method to account for this discrepancy in swimming sharks by estimating the attachment angle from the relationship .