Shifting Between Cognitive and Visual Distraction: The Impact of Cognitive Ability on Distraction Caused by Secondary Tasks

We conducted an experiment in order to investigate impacts of centralexecutive (CE) functions and modality of secondary task presentation in a dualtaskexperiment. We found that shifting ability, out of three major CE functions(inhibition, shifting, and updating) was particularly important in determiningwhether primary (pedal-tracking) task performance was better in the presence ofauditory, vs. visual, presentation of the secondary task

Effects of horizontal acceleration on the superconducting gravimeter CT #036 at Ishigakijima, Japan

In the gravity sensor of a superconducting gravimeter, a superconducting sphere as a test mass is levitated in a magnetic field. Such a sensor is susceptible to applied horizontal as well as vertical acceleration, because the translational degrees of freedom of the mass are not perfectly limited to the vertical direction. In the case of the superconducting gravimeter CT #036 installed at Ishigakijima, Japan, horizontal ground acceleration excited by the movements of a nearby VLBI antenna induces systematic step noise within the gravity recordings. We investigate this effect in terms of the static and dynamic properties of the gravity sensor using data from a collocated seismometer. It is shown that this effect can be effectively modeled by the coupling between the horizontal and vertical components in the gravity sensor. It is also found that the mechanical eigenfrequency for horizontal translation of the levitating sphere is approximately 3 Hz

Seismic Wave Interactions between the Atmosphere - Ocean - Cryosphere system and the Geosphere in Polar Regions

第2回極域科学シンポジウム　共通セッション「大気-海洋-雪氷-固体地球の相互作用」 11月15日（火） 統計数理研究所 3階セミナー室

ATTEMPT TO DETECT COMBINATION TONES BETWEEN THE EARTH\u27S FREE OSCILLATION AND THE EARTH TIDE

When there are two oscillations in a nonlinear system, new oscillations called combination tones appear. We try to detect combination tones between the earth tides and the earth\u27s free oscillations using the long-period seismograms of the Bolivian great deep earthquake on June 9,1994 recorded by a broad band seismometer and a superconducting gravimeter installed at Syowa Station in Antarctica. The results suggest that combination tones between the free oscillations and the semidiurnal tide exist

GRAVIMETRIC TIDAL FACTORS AT SYOWA STATION OBTAINED FROM THREE-YEAR OBSERVATIONS WITH A SUPERCONDUCTING GRAVIMETER

Gravity change observations with a superconducting gravimeter started in March 22,1993 at Syowa Station, Antarctica. The observations have been continuing almost four years until now. In this paper, the first three years of data are investigated for the purpose of obtaining detailed tidal constants for diurnal, semidiurnal and terdiurnal waves. The observed tidal constants show rather large δ factors of 1.2 and of 1.5 for diurnal and semidiurnal tides, respectively. Those apparent large δ factors could be explained by large ocean tide loading. After applying several corrections to the observed tidal parameters, the ocean-tide corrected tidal factors were compared with theoretical ones by an elastic, ellipsoidal, rotating Earth model. Finally, the obtained tidal factors are consistent with theoretical ones within the discrepancy of 1% for principal constituents. More detailed discussion, for example, to see the latitude dependency of tidal factors, awaits accurate calibration of the scale constant of the gravimeter