Night of Day

Mental Models of the Day/Night Cycle

This article presents the results of an experiment which Investigated elementary school children’s explanations of the day/night cycle. First, third, and fifth grade children were asked to explain certain phenomena, such as the disappearance of the sun during the night, the disappearance of stars during the day, the apparent movement of the moon, and the alteratlon of day and night. The results...

All day, and all of the night.

The difference between night and day.

Day and Night: Circadian Rhythms in Worms

Most organisms seem to show ‘‘circadian rhythms’’—cycles of behaviour or gene expression that repeat roughly every 24 hours. Such cycles represent an internal circadian clock that can be ‘‘entrained,’’ or synchronized, to a regular light/dark or temperature cycle, and will then continue to cycle in the absence of the light or temperature stimulus. In the nematode worm Caenorhabditis elegans, ho...

Vehicle Detection under Day and Night Illumination

Effective detection of vehicles in urban traffic scenes can be achieved by exploiting image analysis techniques. Nevertheless, vehicle detection in daytime and at night can’t be approached with the same image analysis algorithms, due to the strongly different illumination conditions. This paper describes the two different sets of image analysis algorithms that have been used in the VTTS system ...