At present, both the familiar cast acrylic and the newer extruded sheets are being used by sign manufacturers, with extruded now representing an estimated 10% of the total.

At the present time we do not know by what biochemical mechanism TSH acts on the thyroid, but for bio-assay of the hormone there are a number of properties by which its activity may be estimated, including release of iodine from the thyroid, increase in thyroid weight, increase in mean height of the follicular cells and increase in the thyroidal uptake of Af.

At the end of 2006, there were an estimated 150, 000 internally displaced people.

At the present time, approximately one third < ref > of human generated emissions are estimated to be entering the ocean.

At the 2001 Daytona 500 at Daytona International Speedway on February 18, 2001, Earnhardt was involved in a car accident after the final lap, in which Earnhardt's car was pushed into the wall nose-first by Ken Schrader's car at an estimated speed of.

At the air base near Tapa, site of the worst damage, officials estimated that six square kilometers of land were covered by a layer of fuel ; 11 square kilometers of underground water were said to be contaminated.

At first a number of leading Esperantists put their support behind the Ido project, but the movement stagnated and declined, first with the accidental death of one of its main proponents and later as people proposed further changes, and the number of current speakers is estimated at between 250 and 5000.

At the closure of the UK Film Council on 31 March 2011, The Guardian reported that " The UKFC's entire annual budget was a reported £ 3m, while the cost of closing it down and restructuring is estimated to have been almost four times that amount.

At their peak, the PACs are estimated to have included 1 million conscripts.

At the end of 2003, GCHQ moved to a new circular HQ ( popularly known as ' the Doughnut '): at the time, it was the second-largest public-sector building project in Europe, with an estimated cost of £ 337 million.

At peak, Haiti's total external debt was estimated at 1. 8 billion dollars, including half a billion dollars to the Inter-American Development Bank, Haiti's largest creditor.

At the outbreak of the war, Iraq had amassed an estimated 35 billion in foreign exchange reserves.

At the time of his death in 1848, Astor was the wealthiest person in the United States, leaving an estate estimated to be worth at least $ 20 million.

At the end of December 2005, authorities estimated that in 2006, the oil profits would be 47 billion ouguiyas ( about US $ 180 million ) and represent a quarter of the state budget, according to RFI.

At their peak, 350, 000 Aztec presided over a wealthy tribute-empire comprising 10 million people, almost half of Mexico's estimated population of 24 million.

At the same time, plans were made for a new South Stand, which was estimated to cost £ 60, 000, however the tender price came out at GB £ 90, 000, a compromise was made, and it was decided to build a new upper South Stand costing £ 64, 000 instead, with the Cardiff Athletic Club contributing £ 15, 000 and the remainder coming from the WRU.

At the start of the project, the total cost was estimated at £ 2. 25M, although by time it was finished in 1984, it had risen by nearly four times that amount.

At the time of the last official census in Burma, 31 March 1983, the population was 35, 442, 972., this was estimated by the CIA World Factbook to have increased to 54, 584, 650 ; however, many other estimates put this much higher, at around 60 million: China's People Daily reported that Burma had a census in 2007, and at the end of 2009 has 59. 2 million people, and growing at 2 % annually, with exception for Cyclone Nargis in 2008, and Britain-based human rights agencies place the population as high as 70 million.

At the dawn of the 13th century the population is estimated at around 16, 000 – 20, 000.

At present 324 km of motorways are under construction with an estimated timetable in 2013-2016.

At its estimated distance, this yields a physical size of about 74 times the radius of the Sun.

At Rigel's estimated distance, Rigel B is separated from its primary by over 2200 AU ( 12 lightdays ); not surprisingly, there has been no sign of orbital movement, though they share the same proper motion.

At long, It is the second longest of the Finger Lakes and has the largest volume, estimated at 4. 2 trillion US gallons ( 16 km³ ), roughly half of the water in all the Finger Lakes.

At nearby Laetoli the oldest known hominid footprints, the Laetoli footprints, were discovered by Mary Leakey in 1978, and estimated to be about 3. 6 million years old and probably made by Australopithecus afarensis.

At the time of independence, Uruguay had an estimated population of just under 75, 000.

At one astronomical unit from the sun ( the Earth's distance ) the dust orbits are probably nearly circular.

At this moment, Loveless and Means arrived, crashing through the undergrowth with their horses, and distracted her, and she ran off a short distance and jumped into a crevice between two rocks.

At no great distance east of this rift-valley is Mount Kilimanjaro-with its two peaks Kibo and Mawenzi, the latter being, and the culminating point of the whole continent — and Mount Kenya, which is.

At a distance of from the Moon, the Scientific Instrument Module ( SIM ) bay cover was jettisoned.

At a distance of about from Earth, Ken Mattingly, the Command Module Pilot, performed a " deep-space " extra-vehicular activity, or spacewalk, during which he retrieved several film cassettes from the CSM's SIM bay.

At room temperature and pressure, barium has a body-centered cubic structure, with a barium – barium distance of 503 picometers, expanding with heating at a rate of approximately 1. 8 /° C.

At a distance of 30, 000 light-years, it has chains of stars extending to the north that are resolvable in small amateur telescopes.

At a distance of about 185, 000 light-years, the globular cluster NGC 7006 is extremely remote.

At the turn of the 20th century, Otto Stolz, Paul du Bois-Reymond, Giuseppe Veronese, and others produced controversial work on non-Archimedean models of Euclidean geometry, in which the distance between two points may be infinite or infinitesimal, in the Newton – Leibniz sense.

At that time, he kept his distance from his brother Pierre-Antoine Cousteau, a " pen anti-semite " who wrote the collaborationist newspaper Je suis partout ( I am everywhere ) and who received the death sentence in 1946.

At other times trains simply do not stop at the overcrowded station and go on to the next closest station, in places where there is another station within walking distance.

At that distance the individual rows of pixels merge into a solid.

At close range such large weapons were of little use, but an intact phalanx could easily keep its enemies at a distance ; the weapons of the first five rows of men all projected beyond the front of the formation, so that there were more spearpoints than available targets at any given time.

At a distance of 400 million light-years, this " butterfly-shaped " galaxy has two supermassive black holes 3, 000 light-years apart.

At a short distance from that city they unexpectedly encountered the Vitellian troops.

At other times the Premier's ministerial office is in the Executive Building a short distance down George Street.

At the same time, the initial wave front propagates away from the source through the space to the distance x to fit the same amount of oscillations, kx = ωt.

At a distance of 2. 44 billion light-years, it is one of the most distant objects directly observable with amateur equipment.

At common viewing distance, the separate sources are indistinguishable, which tricks the eye to see a given solid color.

At gap junctions, cells approach within about 3. 5 nm of each other, rather than the 20 to 40 nm distance that separates cells at chemical synapses.

At the UCI Track World Championships, the distance for senior men is 1000 metres, hence the event's alternative name, the ' Kilo ', short for kilometer.

At the southern end of Tucana lies the Small Magellanic Cloud, a dwarf galaxy that is one of the nearest neighbors to the Milky Way galaxy at a distance of 210, 000 light-years.

At a distance of just under 12 light-years from the Solar System, it is a relatively nearby star.