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Optical flow sensors (OFSs), with characteristics of small size, light weight, low cost, little power consumption, fast response and no radiation, are suitable for miniature aerial vehicles (MAVs) to detect the environment around them. According to our recent works, besides the velocity and the flight height above the ground, many other flight states can also be obtained using optical flow sensors...
This paper exploits the idea of integrating the outputs of several optical flow sensors (OFSs) and a micro-electro-mechanical systems (MEMS) inertial measurement unit (IMU). Several optical flow sensors are fixed on an unmanned aerial vehicle (UAV). Their locations and orientations are different so as to detect the optical flow from different directions. By fusing the optical flow information and...
The first synthesis of the ent-labdane diterpenoid (−)-agathic acid (1) with antibacterial activity is described. A chiral pool approach was employed with a linear sequence of 14 steps starting from readily available and inexpensive andrographolide. The regioselective deoxygenation in terms of Barton-McCombie free radical reaction completed a key step in the synthesis. (−)-Copalic acid (2), an analogue...
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