The Economics of Biogas in the Hog Industry
The Economics of Biogas in the Hog Industry
复制标题
生猪业沼气的经济效益
DOI:
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发表时间:
1999
期刊:
影响因子:
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通讯作者:
Chantelle Washenfelder
中科院分区:
文献类型:
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作者:
Chantelle Washenfelder
Plural ultrasonic transmitter-receiver units are rotated about a pipe or rod to be tested and alternatingly operated in receiving and transmitting modes so that for a quarter turn four helical quadrants are tested and the pipe can axially advance by a distance equal to 4 times the beam width during one complete revolution.