In the laboratory, horseshoe crabs express a circadian rhythm of visual sensitivity as well as daily and circatidal rhythms of locomotion. The major goal of this investigation was to determine whether the circadian clock underlying changes in visual sensitivity also modulates locomotion. To address this question, we developed a method for simultaneously recording changes in visual sensitivity a...

We have detected in Cassini spacecraft data the signature of the periodic tidal stresses within Titan, driven by the eccentricity (e = 0.028) of its 16-day orbit around Saturn. Precise measurements of the acceleration of Cassini during six close flybys between 2006 and 2011 have revealed that Titan responds to the variable tidal field exerted by Saturn with periodic changes of its quadrupole gr...

IT WAS A GREAT HONOR to celebrate the 40th anniversary of the Design Automation Conference with a keynote lecture intended to place in perspective the most relevant research results presented at DAC in all these years and to identify trends and challenges for the future of electronic design automation (EDA). Going through the DAC proceedings, hunting for relevant papers, was indeed a formidable...

1 by laser reflectors left there by astronauts. What does this motion have to do with the ocean circulation? By Kepler's laws, the recession implies that there is a continuing loss of energy in the Earth–Moon system of 3 ǂ10 12 watts, or 3 terawatts, mostly in the ocean. But where in the ocean does this energy go, and what are its effects? On page 775 of this issue, Egbert and Ray 2 produce evi...

The recently upgraded barotropic tidal model TiME is employed to study the influence of fundamental processes, chosen resolution, and bathymetric map on achievable accuracy, exemplary for M2 tide. Additionally, newly introduced pole-rotation scheme allows estimate model’s inherent precision (open ocean rms: 0.90 cm) enables studies Arctic domain without numerical deviations originating from pol...

This work studies the upward-propagating migrating and non-migrating tidal effects from the lower atmosphere on the longitudinal variation of electron density ( Ne) in both the E and F regions at mid-latitudes during the 2002 March equinox. A total of 12 runs are conducted using the Thermosphere Ionosphere Electrodynamic General Circulation model for theoretical investigation. The Ne at altitud...

In this document we will discuss three types of waves: wind-driven waves, tides and tsunamis. When the wind blows on the surface of the ocean it produces ripples, waves, and swell. Gravitational forces (mostly from the moon and sun) plus centrifugal forces in the solar system produce tides. Tectonic forces such as earthquakes that cause vertical displacements of the ocean floor, submarine volca...