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Ancient plankton-like microfossils span two continents
Ancient plankton-like microfossils span two continents
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2017/7/25
Large, robust, lens-shaped microfossils from the approximately 3.4 billion-year-old Kromberg Formation of the Kaapvaal craton in eastern South Africa are not only among the oldest elaborate microorgan...
Design of Long-Span and Wave-Shaped Steel Canopy Structure of Ningxia Helan Mountain Stadium
Modal Analysis Steel Truss Wave-Shaped Steel Canopy
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2011/12/20
Ningxia Helan Mountain stadium the bottom grandstand of which is steel reinforced concrete frame shear wall structure, the top canopy of which is space steel truss structure system. Using SAP2000 (V9....