The Museum of Natural History in Halifax will celebrate CanadaDay with the opening of Giants of the Sea: Leatherback Turtles,an exciting new exhibit from the Vancouver Aquarium MarineScience Centre. This interactive exhibit explores the ancient,yet endangered, turtles that inhabit both the Atlantic andPacific coasts of Canada. Leatherbacks are the largest turtles in the world and can weighup to 916 kilograms (more than 2,000 pounds) and reach 2.7 metres(nearly nine feet) in length. They travel further than any otherreptile, undertaking epic migrations throughout the world’soceans. The Atlantic leatherback lives in southern waters butventures north to the waters off Nova Scotia in search of jellyfish, their principal food. “Leatherbacks are amazing animals in desperate need of our help,”said Tara Taylor, director of conservation programs at theVancouver Aquarium. “No matter where we live, there are ways toget involved. This exhibit encourages Canadians to take action toprotect these incredible turtles.” “The story of the leatherback turtle is an important one to sharewith our visitors,” said museum manager Janet Maltby. “The Museumof Natural History is pleased to provide the first venue forGiants of the Sea on its cross-Canada tour.” As a special Canada Day bonus, Vancouver Aquarium staff will beat the museum at 11 a.m. on Thursday, July 1 to meet visitors andanswer questions about the exhibition and leatherback turtles. Canada Day is also the museum’s official kickoff to summer, withthe opening of the popular Butterfly Pavilion and its livetropical butterflies. Children are invited to decorate themuseum’s sidewalk with turtle and butterfly art. In tribute to the Canada Day festivities, admission to the museumis free. The Museum of Natural History is located at 1747 SummerSt., Halifax. For more information on its events see the websiteat http://museum.gov.ns.ca/mnh/ . Giants of the Sea: Leatherback Turtles is made possible withfinancial assistance provided by the provincial MuseumsAssistance Program, Department of Canadian Heritage and thesupport of the Toronto Zoo, the TD Friends of the EnvironmentFoundation, the Nova Scotia Leatherback Turtle Working Group, andWIDECAST.
Caterpillar is building on its Bucyrus acquisition with the recent signing of another contract to deliver an automated longwall plow system to Chinese company Gasification Co, part of Lvliang Dongyi Group. The system marks the 11th plow system from DBT/Bucyrus/Caterpillar for delivery to Chinese mines. The system will be delivered in the first quarter of 2013 and will go to work in the Xinyan mine in Shanxi province. The system will mine a metallurgical coal seam with a height of 1 to 1.2 m (39 to 47 in), and the face length will be 240 m.The Cat GH800 plow will be paired with a Cat armored face conveyor using PF3 line pans, and the Cat PMC-R roof support control system will manage roof support advance. Automation enhances safety, as there is no need for an operator to be at the coal face during operation. In China, automated plow longwall faces from the Caterpillar predecessors, DBT and Bucyrus, hold all of the production records for seams of less than 2 m thickness. Tiefa Coal Mining Group, with a 50% share in the joint venture project with Dongyi, owns four such systems already and has publicly indicated that the plow systems enable them to profitably mine thin seam reserves that otherwise would be uneconomic. As an example of the robust design and power of Cat plow systems, the gliding plow guide is welded to the face side of the armoured face conveyor. Plow chains up to 42 mm can be used, allowing power installations up to 2 x 800 kW. On older-style systems, the cutting depth was typically controlled by adjusting the shield advancing ram pressure. As a result, cutting depths varied with coal hardness. A modern Cat plow system can cut a precisely defined depth, regardless of coal hardness and seam structure. Cat plows offer a unique horizon control system and incremental plowing that allow the plow angle to change to follow the seam and to easily traverse geological faults. They also offer overload protection and load sharing to maximise efficiency.