Search results
Results from the WOW.Com Content Network
Experiments on European robins, which are migratory, suggest their magnetic sense makes use of the quantum radical pair mechanism.. Magnetoreception is a sense which allows an organism to detect the Earth's magnetic field.
10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, 2 feet (0.6 m) wide Tide-Predicting Machine No. 2 , also known as Old Brass Brains , [ 1 ] was a special-purpose mechanical computer that uses gears , pulleys , chains , and other mechanical components to compute the height and time of high and low tides for specific locations.
Title page of 1628 edition. De Magnete, Magneticisque Corporibus, et de Magno Magnete Tellure (On the Magnet and Magnetic Bodies, and on That Great Magnet the Earth) is a scientific work published in 1600 by the English physician and scientist William Gilbert.
Huts could get as small as 3 m × 2 m (9.8 ft × 6.6 ft). [99] One of the largest huts has a diameter of 12.5 m (41 ft) – a 25,000 year old hut identified in Kostenki, Russia – and was constructed out of 64 mammoth skulls, but given the little evidence of occupation, this is postulated to have been used for food storage rather than as a ...
In his Natural History, Pliny the Elder recounts a legend about a Magnes the shepherd on the island of Crete whose iron-studded boots kept sticking to the path. The earliest ideas on the nature of magnetism are attributed to Thales (c. 624 BC – c. 546 BC). [1] [2] In classical antiquity, little was known about the nature of magnetism. No ...
The passage appears at Book XXXVI of Naturalis Historia, covering "The Natural History of Stones", at chapter 25 entitled "The Magnet: Three Remedies". [4] Although Pliny's description is often cited, the story of Magnes the shepherd is postulated by physicist Gillian Turner to be much older, dating from approximately 900 BCE. [ 5 ]
The brain's magnetic field, measuring at 10 femto tesla (fT) for cortical activity and 10 3 fT for the human alpha rhythm, is considerably smaller than the ambient magnetic noise in an urban environment, which is on the order of 10 8 fT or 0.1 μT. The essential problem of biomagnetism is, thus, the weakness of the signal relative to the ...
Magnetic hysteresis can be characterized in various ways. In general, the magnetic material is placed in a varying applied H field, as induced by an electromagnet, and the resulting magnetic flux density (B field) is measured, generally by the inductive electromotive force introduced on a pickup coil nearby the sample.