In order to use the resonance principle for vibratory picking of Camellia oleifera fruit, frequency sweep tests were carried out on fruiting branches trees. The results showed that acceleration response fruit-bearing had good consistency. fruit removal rate alone evaluate effect is not reliable, and introduction energy utilization vibration significant. best a 8 Hz an excitation time 10 s. was ...

H incur transaction costs when choosing among off-line stores for grocery purchases. They may incur additional transaction costs when buying groceries online versus off-line. We integrate the various transaction costs into a channel choice framework and empirically quantify the relative transaction costs when households choose between the online and off-line channels of the same grocery chain. ...

Choosing a Prime Minister: The Transfer of Power in Britain, by Brazier, Rodney. Oxford University Press. 196 pp. £80.00 It is matter some surprise to most people that there no law providing for the existence office Minister, specifying its functions and powers, qualifications office, length tenure, method appointment removal from office. This principally because UK still lacks written constitu...