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Farmland measurements and crop yields are two main scientific aspects of precision agriculture. Farmland development at Heilongjiang Province, China has been rapidly expanding since 1950's. Meanwhile, there has been a trend that dry farmlands are converted to paddy field since 1990's. Therefore, there is a demand for accurate updated information on the newly developed and expanded paddy field area...
PCCP is usually used throughout many water and wastewater utilities as critical mains with high flow rates, sudden failures can have significant negative consequences. The world has experienced a number of failures of prestressing concrete cylinder pipe (PCCP) lines and as a result during the past ten years, much attention has been focused on reliably assessing the condition of PCCP mains. In this...
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