Science & Information Technology > Science Discussion Forum

Scientists at Scripps Research Institute discover how 2 proteins help keep cells

<< < (2/8) > >>

International Desk, DIU:
AXA Achievement Scholarship in Association with U.S. News and World Report

Deadline: December 1, 2012, or when 10,000 applications have been received (whichever occurs first)

The AXA Achievement Scholarship, sponsored by the AXA Foundation in association with U.S. News & World Report, provides scholarship awards of $25,000 and $10,000, with winners in every state nationwide. The program is open to high school seniors who plan to enroll in a full-time undergraduate course of study at an accredited two- or four-year college or university. Applicants must be United States citizens or legal residents and must have demonstrated ambition and self-drive as evidenced by an outstanding achievement in a school, community, or workplace activity. More information is available at the AXA Foundation website.



http://www.axa-equitable.com/axa-foundation/AXA-achievement-scholarship.html

nature:
1. Siduhe River Bridge. Yesanguanzhen, Hubei, China.

Description: 1,627 feet high / 496 meters high
2,952 foot span / 900 meter span.



With a roadway 1,627 feet (496 mtrs) above the water, the Siduhe River bridge is the latest Chinese champ to take the record as the highest bridge in the world. Opened on November 15th, 2009, it is the 3rd Chinese bridge in less than a decade to claim the title of “World’s Highest Bridge” and is a symbol of just how fast and how far China’s highway infrastructure has come in such a short period of time.

Located about 50 miles (80 km) south of the famous 3 Gorges region of the Yangtze River in China’s mountainous Hubei Province, the Siduhe suspension bridge is just one of several amazing structures on the last 300 mile (483 km) link of the 1,350 mile (2,175 km) long West Hurong highway that now connects Shanghai on the Pacific coast with the cities of Chongqing and Chengdu in the west.

The 8 highest of China’s many high bridges were all built after 2000 and are located primarily in the 3 western Provinces of Guizhou, Hubei and Chongqing. All 8 of these bridges exceed 900 feet (274 meters) in height and rank among the world’s 12 highest while four have held the world record for highest road or rail bridge. Even more amazing, 6 of these bridges are higher than Colorado’s Royal Gorge, the former world’s highest bridge from 1929 to 2001.

2. Baluarte Bridge. El Palmito, Sinaloa, Mexico
Description: 1,321 feet high / 403 meters high
1,706 foot span / 520 meter span



The Baluarte River Bridge is not only the highest bridge in North America but the highest cable stayed bridge in the world surpassing the Millau Viaduct in France. It is the crown jewel of the greatest bridge and tunnel highway project ever undertaken in North America. Known as the Durango-Mazatlán highway, it will be the only crossing for more than 500 miles (800 km) between the pacific coast and the interior of Mexico. The path of this new highway roughly parallels the famous “Devil’s Backbone”, a narrow road that earned its nickname from the way it follows the precarious ridge crest of the jagged peaks of the Sierra Madre Occidental mountains. The dangerous road is a seemingly endless onslaught of twisting, terrifying turns that are so tight there are times the road nearly spirals back into itself.

Sources: Internet.

nature:
3. New River Gorge Bridge.. Fayetteville, West Virginia, United States

Description: 876 feet high / 267 meters high
1,700 foot span / 518 meter span, 1977



A monumental steel arch built on a grand scale not often seen in bridge construction, the New River Gorge bridge in the U.S. state of West Virginia opened in 1977 as the highest and longest arch bridge in the world with a height of 876 feet (267 mtrs) and a main span of 1,700 feet (518 mtrs). Several Chinese bridges eroded these records away, first in 2001 when the Beipanjiang railway arch bridge opened with a greater height of 902 feet (275 mtrs) and then in 2003 when the Lupu arch bridge opened in Shanghai with a longer main span of 1,804 feet (550 mtrs). Then in 2009, China finally opened an even higher 4-lane road arch in the form of the Zhijinghe bridge with a deck 965 feet (294 mtrs) above the water - 90 feet (27 mtrs) higher then the West Virginia span.

Built at a cost of 37 million dollars, the bridge was designed by the large engineering firm of Michael Baker, Jr. and constructed by the legendary American Bridge Company. The massive span itself was built by using a highline with two 330 foot (101 mtr) tall towers some 3,500 feet (1,067 mtrs) apart.

4. Italia Viaduct.. Laino Borgo, Calabria, Italy
Description: 850 feet high / 259 meters high
575 foot span / 175 meter span,1974



The highest bridge in Italy, the Italia viaduct was the second highest bridge in the world upon its opening in 1974. It is still the highest steel beam bridge in the world and was the highest bridge in Europe for 30 years until France’s Millau Viaduct surpassed it in 2004. Only China’s concrete Liuguanghe is higher among all beam bridges. The viaduct is the highest among several impressive bridges along Italy’s spectacular Autostrada Napoli-Reggio Calabria or A3 motorway including the biggest and highest frame bridge in the world over Sfalassa gorge.

Soaring 850 feet (259 mtrs) above a deep cut over the Lao river, the Italia Viaduct lives up to its name with a very Italian-style steel box beam design. The central portion of the bridge consists of a continuous single beam of 1,394 feet (425 mtrs) spread over 3 spans including a central river span of 575 feet (175 mtrs). The 472 foot (144 meter) tall pier is Italy’s fourth highest. The Gorsexio and Sente bridges have higher piers of 541 feet (165 meters) as well as the Rago Viaduct at 482 feet (147 meters).

nature:
5. Phil G McDonald Bridge,Glade Creek Bridge.. Beckley, West Virginia, United States

Description: 700 feet high / 213 meters high
784 foot span / 239 meter span,1988.

.

Of North America’s 10 highest bridges, the Phil G McDonald or Glade Creek bridge is probably the least known. Located several miles east of Beckley, West Virginia, U.S.A., this huge deck truss has one of the tallest piers ever built on an American bridge, rising 341 feet (104 mtrs) from the foundation to the underside of the truss. The shorter pier measures 293 feet (89 mtrs) tall.

Coincidentally, Glade Creek is a near twin of California’s Auburn-Foresthill bridge. From an engineering standpoint, the only major difference between the two is the West Virginia span is a continuous truss instead of a cantilever. The California span is only about 10 percent bigger in size and height. Much of Glade Creek’s status as a “hidden” high bridge is probably due to its being in the shadow of the world famous New River Gorge bridge located just 20 miles (32 km) to the north. Even so, at 700 feet (213 mtrs), Glade Creek is exactly 80 percent as high as the New River span. And although it does not have the same prestige as “The World’s Highest Arch Bridge”, Glade Creek still holds a record of its own as the “World’s Highest Truss Bridge”.

The thick foliage surrounding the structure make it a difficult bridge to photograph. A graded dirt road on the west side of the bridge leads down into the ravine where you can hike along the creek and look up at the deck, 70 stories above.

6. Kochertal Viaduct.. Braunsbach, Baden-Württemberg, Germany.
Description: 607 feet high / 185 meters high
453 foot span / 138 meter span,1979



he highest bridge ever built in Germany, the massive Kochertal Viaduct was the tallest viaduct in the world for 25 years until 2004 when France’s Millau Viaduct finally surpassed it. China also opened two taller viaducts in 2008 and 2009 in the form of the Mashuihe and Longtanhe bridges on the last section of the West Hurong highway between Shanghai and Chengdu. Although there is no absolute definition of what constitutes a viaduct, such bridges usually cross wide valleys with several spans of equal length instead of one large central span. Kochertal’s tallest pier is tied with Longtanhe as the 5th highest in the world measuring 584 feet (178 mtrs). Only the Millau Viaduct and Mexico’s El Carrizo and San Marcos bridges and China's Labajin have taller piers.

Opened in 1979, the Kochertal carries Germany’s A6 motorway 607 feet (185 meters) above the broad Kocher River valley. Constructed outward from both sides of the valley using formworks, the massive 21 foot (6.5 meter) deep single cell box girder was launched first before inclined struts were placed at 25 foot (7.66 meter) intervals from the bottom edge, allowing the wider wings of the road deck to cantilever out to the side from the central box beam. The total width of the massive deck is 102 feet (31 meters). The clean lines of the bridge come from architect Hans Kammerer as well as the engineers at Leonhardt, Andrä und Partner and Dycherhoff & Widmann.


Md. Khairul Bashar:
Men were arranged to make alphabet.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

Go to full version