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Polar and unit
Polar coordinates in the plane employ a radial unit vector u < sub > ρ </ sub > and an angular unit vector u < sub > θ </ sub >, as shown above.
Within the last several years, Nike, Polar and other companies have produced and marketed sports watches for runners that include footpods, containing accelerometers to help determine the speed and distance for the runner wearing the unit.
* Polar sciences unit
A modification to the standard unit for Polar regions is the addition of a second, north facing, sphere and card, to record the sunlight during the summer when it remains in the sky for 24 hours.

Polar and at
Still further south lies the Polar front, which is marked by a transition to very cold, relatively fresh, Antarctic Surface Water at the surface.
Smithsonian at the Poles: Contributions to International Polar Year Science.
This proceedings volume features the research presented at the Smithsonian at the Poles symposium, convened as part of the International Polar Year 2007-2008.
Polar coordinates centered at the center.
Polar coordinates centered at focus.
During the International Polar Year 1882-1883 the Austro-Hungarian North Pole Expedition stayed one year at Jan Mayen.
In November 1978 the group recorded at Polar Studios in Stockholm, Sweden.
These ranged from simple relics ( Scott's sledging flag in Exeter Cathedral ) to the foundation of the Scott Polar Research Institute at Cambridge.
Using a route along the previously unknown Axel Heiberg Glacier, they arrived at the edge of the Polar Plateau on 21 November after a four-day climb.
In 1882 – 1883, a German expedition for the First International Polar Year was stationed at Royal Bay on the southeast side of the island.
The population of polar bears are locally recovering from the major culls of the 1960s and 1970s that came about due to the availability of snow scooters ; however, the Polar bear remains threatened at a global level, due to unsustainable levels of killing by humans and due to marine water pollution.
Based on studies by glaciologist Lonnie Thompson, professor at Ohio State University and researcher with the Byrd Polar Research Center, a number of indicators shows there was a global change in climate 5, 200 years ago, probably due to a drop in solar energy output as hypothesized by Ohio State University.
Polar plots of a four-driver industrial columnar public address loudspeaker taken at six frequencies.
Polar mesospheric clouds are the highest in the atmosphere and occur mostly at altitudes of, which is about ten times the altitude of tropospheric high clouds.
Polar mesospheric clouds all tend to form at an extreme altitude range and are consequently not classified into height-related families.
** Polar circle, either of two circles of latitude marking the extreme southerly points ( northern hemisphere ) or northerly points ( southern hemisphere ) at which the sun may remain above or below the horizon for 24 continuous hours at some point during the year
Many of these rivers finish near Moosonee, and paddlers can take the Polar Bear Express train south to Cochrane at the end of a trip.
Another small collection exists at the Polar Museum in Tromsø.
# Polar mesospheric summer echoes ( PMSE ) have been studied, probing the mesosphere using the IRI as a powerful radar, and with a 28 MHz radar, and two VHF radars at 49 MHz and 139 MHz.
Centre for Polar Observation & Modelling glaciologists Duncan Wingham and Martin Siegert published in 2006 that many of the subglacial lakes of Antarctica are at least temporarily interconnected.
Poland operates the Polish Polar Station at Hornsund, with ten permanent residents.

Polar and two
Polar Beverages bottles Moxie in Worcester, Massachusetts, in two liter, one liter, and 12 oz cans.
Polar bears can breed with brown bears to produce fertile grizzly – polar bear hybrids, rather than indicating that they have only recently diverged, the new evidence suggests more frequent mating has continued over a longer period of time, and thus the two bears remain genetically similar.
Originally, two spacecraft were to be built by NASA and ESA, as the International Solar Polar Mission.
* Polar twins ( or " polar body twins "), where two sperm fertilize an ovum, one of the two fertilizing a polar body ; or where an ovum splits into identical copies, one containing a polar body, prior to fertilization, allowing it to be fertilized by two different sperm.
Zemeckis followed The Polar Express with two other motion capture films: Beowulf and Disney's A Christmas Carol.
During the ( north ) Polar Exploration of the early 20th century, Inuit of northern Greenland were found to be making iron knives from two particularly large nickel-iron meteors.
Kolchak took part in two Arctic expeditions and for a while was nicknamed " Kolchak-Poliarnyi " (" Kolchak the Polar ").
Bowdoin's Peary-MacMillan Arctic Museum honors the two explorers, and the College's mascot, the Polar Bear, was chosen in 1913 to honor MacMillan, who donated a particularly large specimen to his alma mater in 1917.
* February 24 – Returning to West Germany from Antarctica, where in December 1984 it had become one of the first two German planes ever to land at the South Pole, Polar 3, a Dornier Do 228 operated as a survey and research airplane by the Alfred Wegener Institute for Polar and Marine Research, is shot down over Western Sahara south of Dakhla by Polisario Front guerrillas, killing its entire three-man crew.
Image: Ursus maritimus 3 1999-07-11. jpg | Polar bear mother and two cubs climbing up Guillemot Island
* NASA loses two Mars probes, the Mars Climate Orbiter and the Mars Polar Lander.
Ontario Northland's intercity passenger train Polar Bear Express operates a domed car that has two levels, however, this car is not technically considered a bilevel passenger rail car.
The failure of the Mars Polar Lander took place two and a half months after the loss of the Mars Climate Orbiter.
The Mars Surveyor ' 98 program comprised two spacecraft launched separately, the Mars Climate Orbiter ( formerly the Mars Surveyor ' 98 Orbiter ) and the Mars Polar Lander ( formerly the Mars Surveyor ' 98 Lander ); on board the Mars Polar Lander spacecraft were two surface-penetrator probes ( Deep Space 2 ).
It included two highly advanced miniature space probes which were sent to Mars aboard the Mars Polar Lander in January 1999.

Polar and times
Polar bears appear on Jan Mayen, although in diminished numbers compared with earlier times.
By September 2007 the North Pole had been visited 66 times by different surface ships: 54 times by Soviet and Russian icebreakers, 4 times by Swedish Oden, 3 times by German RV Polarstern, 3 times by USCGC Healy and USCGC Polar Sea, and once by CCGS Louis S. St-Laurent and by Norwegian Vidar Viking.
The Polar Express in IMAX 3D 70 mm earned 14 times as much, per screen, as the simultaneous 2D 35 mm release of that film in the fall of 2004.

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