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from article Bridge maintenance
Under-bridge snooper truck during bridge inspection. (Courtesy Lian Duan)
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from article Bridge maintenance
Repair of concrete I-girder by replacement of damaged concrete.
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from article Bridge maintenance
Strengthening of a steel I-girder by adding new steel plates to flanges.
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from article Bridge maintenance
Strengthening a steel girder by applying external post-tensioning force.
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from article Bridge maintenance
A typical steel jacket for a reinforced-concrete column.
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from article Bridge maintenance
Built-up steel member retrofit. (Courtesy Lian Duan)
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from article Bridge maintenance
Seismic isolation bearing installed in the Antioch Bridge, California. (Courtesy Lian Duan)
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from article Bridge maintenance
A damper installed in the west span of the San Francisco–Oakland Bay Bridge, California. (Courtesy Lian Duan)
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from article Stereophonic radio transmission
Baseband spectrum of an FM stereo signal. This audio and supersonic spectrum is frequency-modulated onto a radio-frequency carrier.
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from article Video disk
DVD operational principles.
